Reverse input cut clutch

Abstract

The present application provides a configuration of a reverse input cut clutch which can reduce the number of components and improve assembly. An input member (3) has an input-side engaging portion (14) at a part thereof in the axial direction, and has an input arm portion (17) which is inserted through the input-side engaging portion (14) in the axial direction. The input arm portion (17) has at least either one of a one-side regulating portion (20) which is arranged at a part of the input-side engaging portion (14) on the one side in the axial direction and regulates movement of a coupling member (5) toward the one side in the axial direction with respect to the input member (3), and a other-side regulating portion (21) which is arranged at a part of the input-side engaging portion (14) on the other side in the axial direction and regulates movement of the coupling member (5) toward the other side in the axial direction with respect to the input member (3).

Description

Technical Field

[0001] This disclosure relates to a reverse input cut-off clutch that transmits rotational torque input to an input component to an output component, and conversely, completely cuts off rotational torque input in the opposite direction to the output component without transmitting it to the input component, or transmits only a portion of it to the input component while cutting off the remainder. Background Technology

[0002] The reverse input cut-off clutch has the following functions: it transmits the rotational torque input to the input component of the input-side mechanism connected to the drive source, etc., to the output component of the output-side mechanism connected to the reduction mechanism, etc.; in contrast, it completely cuts off the rotational torque input in the opposite direction to the output component and does not transmit it to the input component, or transmits only a part of it to the input component and cuts off the remaining part.

[0003] Reverse input cut-off clutches are categorized into locking-type and free-type based on the difference in the mechanism for cutting off the rotational torque input in the reverse direction to the output component. The locking-type clutch includes a mechanism to prevent rotation of the output component when the rotational torque is input in the reverse direction, while the free-type clutch includes a mechanism to allow the output component to idle when the rotational torque is input to the output component. The choice between the locking-type and free-type reverse input cut-off clutches depends on the intended use of the device in which the reverse input cut-off clutch is installed.

[0004] In the locking-type reverse input cut-off clutch described in International Publication No. 2023 / 136149, when a rotational torque is input to the input component, the input-side engaging portion of the input component engages with the input-side engaged portion of the engaging member. The engaging member moves in a direction separating from the pressed surface of the pressed component, and by engaging the output-side engaged portion of the engaging member with the output-side engaging portion of the output component, the rotational torque input to the input component is transmitted to the output component. Conversely, when a reverse rotational torque is input to the output component, the output-side engaging portion of the output component engages with the output-side engaged portion of the engaging member. The engaging member moves in a direction closer to the pressed surface, pressing the pressed surface against the pressed surface, causing frictional engagement between the pressed surface and the pressed surface.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2023 / 136149 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In a reverse input cut-off clutch, if the axial movement of the engaging member relative to the output member is not restricted, the engaging member may tilt axially. While the engaging member is held tilted axially, when it is moved radially outward, the pressing and pressed surfaces may partially come into contact, causing engagement. This unnecessarily increases the force required to switch from a locked or semi-locked state to a unlocked or semi-unlocked state, or causes plastic deformation or wear on the pressing and / or pressed surfaces.

[0010] In the reverse input cut-off clutch described in International Publication No. 2023 / 136149, the axial movement of the engaging member is limited by two gaskets and a stop ring as a limiting component.

[0011] In the reverse input cut-off clutch described in International Publication No. 2023 / 136149, two gaskets and a limiting component are required to limit the axial movement of the engaging parts. As a result, the number of parts in the reverse input cut-off clutch increases, leading to inconveniences such as increased component management costs and assembly time.

[0012] The purpose of this disclosure is to realize a reverse input cut-off clutch structure that can reduce the number of parts and improve assemblability.

[0013] Solution for solving the problem

[0014] One aspect of the present disclosure is a reverse input cut-off clutch comprising a pressed part, an input part, an output part, and an engaging part.

[0015] The aforementioned pressed component has a pressed surface on its inner circumferential surface.

[0016] The input component has an input-side engaging portion disposed radially inside the pressed surface, is connected to the input-side mechanism on one side in the axial direction, and is coaxially disposed with the pressed surface.

[0017] The output component has an output side engagement portion disposed radially inward of the input side engagement portion, connected to the output side mechanism on the other axial side, and coaxially disposed with the pressed surface.

[0018] The aforementioned engaging member has a pressing surface facing the pressing surface, an input-side engaging portion that can engage with the input-side engaging portion, and an output-side engaging portion that can engage with the output-side engaging portion, and is configured to be able to move radially.

[0019] When a rotational torque is input to the input component, the engaging member moves radially in a direction separating from the pressed surface, based on the engagement of the input-side engaging portion and the input-side engaged portion. By engaging the output-side engaged portion with the output-side engaging portion, the rotational torque input to the input component is transmitted to the output component. Conversely, when a rotational torque is input to the output component in the opposite direction, the engaging member pushes the pressing surface against the pressed surface, causing frictional engagement between the pressing surface and the pressed surface, based on the engagement of the output-side engaging portion and the output-side engaged portion.

[0020] The input component has an input-side engaging portion in the axial direction and an input arm portion that is inserted through the input-side engaging portion in the axial direction.

[0021] The input arm has at least one of a one-sided limiting portion and a other-sided limiting portion. The one-sided limiting portion is disposed on a portion axially closer to the input-side engaging portion and restricts the movement of the engaging member relative to the input component on one axial side. The other-sided limiting portion is disposed on a portion axially closer to the input-side engaging portion and restricts the movement of the engaging member relative to the input component on the other axial side.

[0022] In one aspect of the reverse input cut-off clutch of this disclosure, the input arm may have the other side limiting portion, which may protrude radially inward more than the input side engaging portion.

[0023] In one aspect of the reverse input cut-off clutch disclosed herein, the input arm may have the aforementioned one-sided limiting portion, which may protrude further in the diametrical direction of the input arm than the input-side engaging portion.

[0024] The aforementioned one-sided limiting part can protrude more radially inward than the aforementioned input-side engaging part.

[0025] In one aspect of the reverse input cut-off clutch disclosed herein, the input arm can have both the aforementioned one-side limiting portion and the aforementioned other-side limiting portion.

[0026] When the input arm has both the aforementioned one-side limiting portion and the aforementioned other-side limiting portion, both the aforementioned one-side limiting portion and the aforementioned other-side limiting portion can protrude radially inward more than the aforementioned input-side engaging portion. Furthermore, the distance from the central axis of the input component to the aforementioned one-side limiting portion can be made smaller than the distance from the central axis of the input component to the aforementioned other-side limiting portion.

[0027] In one aspect of the reverse input cut-off clutch disclosed herein, the input arm portion can be composed of two input arms, and the two input arms can be arranged on opposite sides, separated by the central axis of the input component. The engaging member can be composed of two engaging members.

[0028] The effects of the invention

[0029] The reverse input cut-off clutch according to one aspect of this disclosure has a construction that can reduce the number of parts and improve assemblability. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the reverse input cut-off clutch, which is a first example of an embodiment of this disclosure.

[0031] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0032] Figure 3 This is a side view showing the input component, engagement component, and force application component removed from the reverse input cut-off clutch in the first example.

[0033] Figure 4 This is a perspective view showing the input component, engagement component, and force application component extracted from the reverse input cut-off clutch in the first example.

[0034] Figure 5 This is an exploded perspective view showing the input component, engagement component, and force application component removed from the reverse input cut-off clutch in the first example.

[0035] Figure 6 This is a side view showing the input component being removed from the reverse input cut-off clutch in the first example.

[0036] Figure 7 middle, Figure 7 (A) and Figure 7 (B) is an end view taken from the opposite axial side after removing the input component, engaging component, and force-applying component from the reverse input cut-off clutch of the first example. Figure 7 (A) is a diagram showing the state in which the two engaging parts are closest to each other when the clutch is in operation with the reverse input cut-off mode. Figure 7 (B) is a diagram showing the state in which the force-applying component elastically deforms to the point that the protrusions of the two engaging parts abut against each other.

[0037] Figure 8 yes Figure 1 Sectional view I-I.

[0038] Figure 9 This omits the force-applying component to represent the state of rotational torque input to the input component. Figure 1 Sectional view I-I.

[0039] Figure 10 This indicates the state of the rotational torque input / output components by omitting the force-applying components. Figure 1 Sectional view I-I.

[0040] Figure 11 This represents the second example of an embodiment of the present disclosure, where the reverse input cut-off clutch is equivalent to... Figure 1 The image.

[0041] Figure 12 This represents the third example of an embodiment of the present disclosure, where the reverse input cut-off clutch is equivalent to... Figure 1 The image.

[0042] In the picture:

[0043] 1, 1a, 1b—Reverse input cut-off clutch; 2—Pressed component; 3, 3a, 3b—Input component; 4—Output component; 5—Engaging component; 7—Pressed surface; 8—Housing element; 9—Large diameter cylindrical surface; 10—Small diameter cylindrical surface; 11—Connecting surface; 12—Inner flange; 13—Threaded hole; 14—Input side engagement part; 16—Radial inner surface; 17, 17a, 17b—Input arm; 18—Input shaft; 19—Input flange; 20—One side restriction part; 21—The other side restriction part; 22—Radial outer surface; 23—Side; 24—Face; 25—End face; 26—End face; 27—Radial inner surface; 28—Relief groove; 29—Radial inner surface; 30—Relief groove; 31—Output side engagement part; 32— Output shaft portion, 33—end face, 34—flat surface, 35—convex curved surface, 36—large diameter portion, 37—medium diameter portion, 38—small diameter portion, 39—outer flange portion, 40—reducer, 41—drive pulley, 42—toothed belt, 43a, 43b—radial rolling bearing, 44—angle R portion, 45—pressing surface, 46—input side engaged portion, 47—output side engaged portion, 48—radial inner surface, 49—radial outer surface, 50—circumferential side, 51—flat surface portion, 52—protrusion, 53—end face, 54—end face, 55—force-applying component, 56—support component, 57—bearing retainer, 58—partial cylindrical portion, 59—outer flange portion, 60—through hole, 61—bolt, 62—shim, 63—limiting component, 64—shim. Detailed Implementation

[0044] [First example]

[0045] use Figures 1-10 The reverse input cut-off clutch of the first embodiment of the present disclosure will be described.

[0046] In the following description, unless otherwise specified, axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the pressed surface 7. The axial, radial, and circumferential directions of the pressed surface 7 are consistent with the axial, radial, and circumferential directions of the input component 3, and also consistent with the axial, radial, and circumferential directions of the output component 4. Furthermore, the axial side refers to the input side of the reverse input cut-off clutch 1. Figures 1-3 , Figure 4 as well as Figure 6 The right side), the other axial side refers to the output side of the reverse input cut-off clutch 1 ( Figures 1-3 , Figure 5 as well as Figure 6 (Left side).

[0047] <Explanation of the construction of the reverse input cut-off clutch>

[0048] The reverse input cut-off clutch 1 disclosed herein includes a pressed part 2, an input part 3, an output part 4, and an engaging part 5.

[0049] The elements constituting the reverse input cut-off clutch 1 have the same structure and function as the existing reverse input cut-off clutch for the pressed part 2, the output part 4, and the engaging part 5.

[0050] The pressed member 2 has a pressed surface 7 on its inner circumferential surface. The input member 3 has an input-side engaging portion 14 disposed radially inside the pressed surface 7 and is coaxially disposed with the pressed surface 7. The output member 4 has an output-side engaging portion 31 disposed radially inside the input-side engaging portion 14 and is coaxially disposed with the pressed surface 7. The engaging member 5 has a pressing surface 45 opposite to the pressed surface 7, an input-side engaged portion 46 capable of engaging with the input-side engaged portion 14, and an output-side engaged portion 47 capable of engaging with the output-side engaged portion 31, and is configured to be radially movable.

[0051] When a rotational torque is input to the input component 3, the engaging member 5 moves radially in the direction of separation from the pressed surface 7, based on the engagement of the input-side engaging part 14 and the input-side engaged part 46, and by engaging the output-side engaged part 47 with the output-side engaging part 31, the rotational torque input to the input component 3 is transmitted to the output component 4.

[0052] Conversely, when a rotational torque is input to the output component 4 in the opposite direction, the engaging part 5 pushes the pressing surface 45 against the pressed surface 7 based on the engagement of the output-side engaging part 31 and the output-side engaged part 47, causing the pressing surface 45 and the pressed surface 7 to engage in frictional contact. That is, the reverse input cut-off clutch 1 completely cuts off the rotational torque input to the output component 4 without transmitting it to the input component 3, or transmits only a portion of it to the input component 3 while cutting off the remaining portion.

[0053] Furthermore, in this specification, the direction of the pressing surface 45 of the engaging member 5 relative to the pressed surface 7 is defined as the first direction ( Figures 7-10 The direction that is orthogonal to both the axial direction and the first direction of the pressed surface 7 is defined as the second direction. Figures 7-10 (Left and right directions). Regarding the engaging component 5, the direction consistent with the first direction is defined as the radial direction of the engaging component 5. Figure 8 The direction indicated by arrow α in the middle is defined as the width direction of the engaging part 5, which is consistent with the second direction. Figure 8 (The direction is indicated by the arrow β in the image).

[0054] The input-side engaging portion 14 of the input component 3 and the output-side engaging portion 31 of the output component 4 are disposed radially inside the pressed surface 7. In the first direction, they are arranged radially inside the pressed surface 7 in the following order: input-side engaging portion 14, the portion of the input-side engaged portion 46 that engages with the input-side engaging portion 14, output-side engaged portion 47, and output-side engaging portion 31. Furthermore, the input-side engaging portion 14, the output-side engaging portion 31, and the engaging member 5 are rotatable radially inside the pressed surface 7.

[0055] In particular, the reverse input cut-off clutch 1 of this disclosure is characterized by the fact that, by modifying the input member 3, the axial movement of the engaging member 5 can be directly restricted by the input member 3. Hereinafter, the constituent elements of the reverse input cut-off clutch 1 will be described, focusing on the structure of the input member 3.

[0056] [Pressed component]

[0057] The pressed component 2 has a pressed surface 7 on its inner circumferential surface. When the engaging component 5 moves radially outward in a first direction toward the pressed surface 7, the pressed surface 7 forms a surface that contacts the pressing surface 45 of the engaging component 5. That is, the pressed surface 7 has the function of frictionally engaging with the pressing surface 45 of the engaging component 5 when the rotational torque is input to the output component 4 in the opposite direction.

[0058] The pressed part 2 is supported on a fixed part that does not rotate when the reverse input cut-off clutch 1 is used, or it is integrally provided on the fixed part so that its rotation is constrained.

[0059] The shape of the pressed part 2 is not limited as long as it is configured to have a pressed surface 7 on its inner circumferential surface. The pressed surface 7 is circular when viewed from the axial direction, but is not limited to this. In this example, it is a cylindrical surface with an inner diameter that does not change in the axial direction.

[0060] In this example, the pressed part 2 includes a housing element 8. The housing element 8 is a mechanical element for inserting the pressed part 2 into the reverse input cut-off clutch 1.

[0061] The housing element 8 has an inner circumferential surface in the shape of a stepped cylindrical surface. Specifically, the inner circumferential surface of the housing element 8 is formed by connecting a large-diameter cylindrical surface 9 on one axial side and a small-diameter cylindrical surface 10 on the other axial side via a connecting surface 11 facing one axial side. In this example, the large-diameter cylindrical surface 9 constitutes the pressed surface 7.

[0062] The housing element 8 has an inward flange 12 protruding radially inward at one end of the small-diameter cylindrical face 10, and has threaded holes 13 with multiple openings in the circumferential direction on the other side of the axial direction.

[0063] The pressed part 2 may also include other housing elements that block the opening on one axial side of the housing element 8. In this case, the housing element 8 and the other housing elements are radially positioned by fitting (embedding) the other housing elements into the end of the housing element 8 on one axial side without wobbling, and the housing element 8 and the other housing elements are joined together by bolts or other connecting parts to form the pressed part 2.

[0064] [Input Component]

[0065] The input component 3 has an input-side engaging portion 14 disposed radially inside the pressed surface 7 and is coaxially disposed with the pressed surface 7.

[0066] The input component 3 is connected to an input-side mechanism such as an electric motor on one axial side and is input with rotational torque. Specifically, the input component 3 can be composed of the output shaft of the aforementioned input-side mechanism, or it can be configured as a component different from the aforementioned output shaft, and coaxially fixed to the aforementioned output shaft, etc.

[0067] The input-side engaging part 14 is an element that engages with the input side of the engaging member 5 by the engaging part 46 when a rotational torque is input to the input member 3, thereby causing the engaging member 5 to rotate.

[0068] The input-side engaging portion 14 is provided on a portion radially outward from the rotation center axis O of the input component 3, and has a portion that engages with, specifically contacts, the input-side engaging portion 46 of the engaging member 5. The input-side engaging portion 14 is configured such that its radially inner surface 16 engages (contacts) with the radially inner surface 48 of the input-side engaging portion 46 as the input component 3 or the engaging member 5 rotates.

[0069] The input component 3 has an input arm 17, which has an input side engaging portion 14 in a portion of its axial direction, and the input side engaging portion 46 of the engaging member 5 is inserted through it in the axial direction.

[0070] The input arm 17 is an element for inserting the input side engaging portion 46 of the engaging member 5, and the input side engaging portion 14 is disposed inside the input side engaging portion 46 of the engaging member 5.

[0071] The input arm 17 has at least one of a one-side limiting portion 20 and a other-side limiting portion 21, wherein the one-side limiting portion 20 is disposed on a portion axially closer to the input-side engaging portion 14 and limits the movement of the engaging member 5 relative to the input member 3 on an axial side, and the other-side limiting portion 21 is disposed on a portion axially closer to the input-side engaging portion 14 and limits the movement of the engaging member 5 relative to the input member 3 on an axial side.

[0072] The one-sided limiting part 20 is an element used to limit the movement of the engaging member 5 relative to the input member 3 in one direction in the axial direction.

[0073] The other side limiting part 21 is an element used to limit the movement of the engaging member 5 relative to the input member 3 in the axial direction to the other side.

[0074] In this example, in addition to the input arm 17, the input component 3 also has an input shaft 18 and an input flange 19.

[0075] The input shaft portion 18 is an element that connects the input component 3 to the input-side mechanism to transmit rotational torque. In this example, the input shaft portion 18 has a cylindrical shape. The input component 3 can be connected to the output shaft of the input-side mechanism by non-circular engagement, such as spline engagement, between the inner circumferential surface of the input shaft portion 18 and the outer circumferential surface of the output shaft of the input-side mechanism such as an electric motor, thereby transmitting torque, or by pressing or the like.

[0076] The input flange 19 is an element used to position the input arm 17 in a portion that is radially outward from the rotation center axis O of the input component 3. In this example, the input flange 19 protrudes radially outward from the outer peripheral surface of the end on the axial side of the input shaft 18.

[0077] The input arm 17 has at least one of a side limiting portion 20 and a side limiting portion 21, and an input side engaging portion 14. Its shape is not limited as long as it is configured to allow the input side engaging portion 14 to be disposed inside the input side engaging portion 46 of the engaging member 5.

[0078] In this example, the input arm 17 has a partially annular shape, a generally trapezoidal shape, or a cross-sectional shape similar to these, which increases in length in the second direction as it moves outward in the first direction. The radially outer surface 22 of the input arm 17 extends along its entire axial length by a radius of curvature r centered on the central axis O of the input component 3. 17The input arm 17 has a partially cylindrical convex surface. The side surfaces 23 on both sides in the second direction and along the entire axial length are composed of inclined surfaces that slope outward in the direction of the first direction as they move towards the sides in the second direction. The inner surface 24 in the first direction of the input arm 17 has a stepped surface.

[0079] The radius of curvature r of the radial outer surface 22 of the input arm 17 17 The size is set to allow the input arm 17 to pass through the input-side latching portion 46 of the latching member 5. Specifically, in this example, as... Figure 7 As shown in (B), the aforementioned radius of curvature r 17 Specific radius R 46 small(r) 17 <R 46 ), radius R 46 This refers to the radius of the inscribed circle of the radially outer surface 49 of the two input-side engaged portions 46, where the two force-applying members 55 disposed between the two engaging members 5 are elastically deformed and the two engaging members 5 are brought closer together until the protrusions 52 of their respective engaging members 5 abut against each other. Therefore, during the assembly of the reverse input cut-off clutch 1, even if the input-side engaged portion 46 of the engaging member 5 is formed by a through hole, both input arms 17 can be simultaneously inserted through the input-side engaged portions 46 of the two engaging members 5.

[0080] The number of input arms 17 is determined by the number of latching parts 5. When the latching parts 5 are composed of multiple latching parts 5, the input arms 17 are also composed of multiple input arms 17.

[0081] In this example, the engaging member 5 consists of two engaging members 5. Therefore, the number of input arms 17 matches the number of engaging members 5, consisting of two input arms 17. The two input arms 17 are arranged on opposite sides, separated by the central axis O of the input component 3. The two input arms 17 are evenly arranged at 180 degrees in the circumferential direction.

[0082] In this example, the axial end of the input arm 17 is connected to the radially outer end of the input flange 19. Therefore, the input arm 17 is inserted through the input side engaging portion 46 of the engaging member 5 from its axial end.

[0083] The input-side engaging portion 14 is disposed inside the input-side engaging portion 46 of the engaging member 5, and its shape is not limited as long as it is configured to engage with the input-side engaging portion 46.

[0084] For example, the input-side engaging portion 14 can have either a cross-sectional shape that is symmetrical about the circumferential direction or an asymmetrical cross-sectional shape about the circumferential direction. In this example, the input-side engaging portion 14 has a cross-sectional shape that is symmetrical about the circumferential direction.

[0085] For example, the input-side engagement portion 14 can have a partially annular shape, a trapezoidal shape, or a cross-sectional shape similar to these, where the length increases in the second direction as it moves outward in the first direction. In this example, the input-side engagement portion 14 has a cross-sectional shape similar to a trapezoidal shape. In the radially inner surface 16 of the input-side engagement portion 14, the middle portion in the second direction is formed by a flat surface orthogonal to the straight line connecting the central axis O of the input component 3 and the center of the input-side engagement portion 14 when viewed axially, and the two side portions in the second direction are formed by partially cylindrical convex surfaces that incline outward in the first direction as they move towards the two sides in the second direction. The radially outer surface of the input-side engagement portion 14 is formed by the axially middle portion of the radially outer surface 22 of the input arm portion 17. Furthermore, the side surfaces on both sides of the input-side engagement portion 14 in the second direction are formed by the axially middle portions of the side surfaces 23 on both sides of the input arm portion 17 in the second direction.

[0086] The axial position of the input-side engaging portion 14 on the input arm 17 is not particularly limited as long as it allows the input-side engaging portion 14 to be positioned inside the input-side engaging portion 46, and it is possible to provide a one-sided limiting portion 20 on one side of the input-side engaging portion 14 axially, and / or a other-sided limiting portion 21 on the other side of the input-side engaging portion 14 axially. In this example, the input-side engaging portion 14 is positioned at the axial middle of the input arm 17.

[0087] One side limiting part 20 and / or the other side limiting part 21 are axially opposed to the engaging member 5, regardless of whether the engaging member 5 stops or moves (including rotates) relative to the pressed member 2, thus limiting the axial movement of the engaging member 5 relative to the input member 3.

[0088] The input arm 17 may have only one side restriction part 20 and the other side restriction part 21, or only the other side restriction part 21, or both of the other side restriction part 20 and the other side restriction part 21.

[0089] When the input arm 17 has only one side limiting part 20 (either one side limiting part 20 or the other side limiting part 21), the input member 3 can directly limit the movement of the engaging member 5 to one axial side via the one side limiting part 20. Therefore, there is no need for dedicated components, such as gaskets and limiting components, to limit the movement of the engaging member 5 to one axial side. The movement of the engaging member 5 to the other axial side can be limited, for example, by using a gasket disposed between the engaging member and the end face of the output shaft on one axial side, or by using the end face of the output shaft on one axial side.

[0090] When the input arm 17 only has the other side restriction part 21 (one side restriction part 20 and the other side restriction part 21), the input member 3 can directly restrict the movement of the engaging member 5 to the other axial side via the other side restriction part 21. Therefore, a dedicated component, i.e., a gasket, is not required for restricting the movement of the engaging member 5 to the other axial side. The movement of the engaging member 5 to one axial side can be restricted, for example, by a limiting component mounted on the output member and a gasket that is set as needed.

[0091] When the input arm 17 has both a one-sided limiting part 20 and a other-sided limiting part 21, the input member 3 can directly limit the movement of the engaging member 5 to one axial side by the one-sided limiting part 20, and can directly limit the movement of the engaging member 5 to the other axial side by the other-sided limiting part 21. Therefore, it is not necessary to have dedicated components for limiting the movement of the engaging member 5 to one axial side and the other axial side, namely either the two gaskets or the limiting component.

[0092] In this example, the input arm 17 has both a one-side limiting part 20 and a other-side limiting part 21. Therefore, the input member 3 can directly limit the movement of the engaging member 5 to one axial side by the one-side limiting part 20, and can directly limit the movement of the engaging member 5 to the other axial side by the other-side limiting part 21.

[0093] In this example, a one-sided limiting part 20 is provided at one end of the input arm 17 on one axial side, and a other-sided limiting part 21 is provided at the other end of the input arm 17 on the other axial side.

[0094] The one-sided limiting portion 20 can protrude further in the diameter direction of the input arm portion 17 than the input-sided engaging portion 14. The one-sided limiting portion 20 is disposed in the input arm portion 17 on one axial side more than the input-sided engaging portion 14 disposed inside the input-sided engaging portion 46 of the engaging member 5, and therefore does not insert into the inside of the input-sided engaging portion 46. Therefore, the portion of the input arm portion 17 with the one-sided limiting portion 20 does not need to be configured to insert into the input-sided engaging portion 46; the one-sided limiting portion 20 only needs to be configured to restrict the movement of the engaging member 5 in one axial direction. Therefore, the one-sided limiting portion 20 is not limited in its protrusion direction and can protrude further radially inward and / or radially outward than the input-sided engaging portion 14. Furthermore, the one-sided limiting portion 20 can also protrude further circumferentially on one side and / or circumferentially on the other side than the input-sided engaging portion 14.

[0095] One side of the limiting part 20 has an end face 25 on the other side of the axial direction, which is opposite to the end face 53 on one side of the axial direction of the engaging member 5. In this example, the end face 25 on the other side of the axial direction of the limiting part 20 is formed by a flat surface that is substantially orthogonal to the central axis O of the input member 3.

[0096] In this example, the one-sided limiting portion 20 protrudes further radially inward than the input-sided engaging portion 14. Specifically, the one-sided limiting portion 20 is provided at the axial one-sided end of the surface 24 on the first direction inner side of the input arm portion 17, and protrudes further radially inward than the radially inner surface 16 of the input-sided engaging portion 14.

[0097] The side surfaces on both sides of the first side restriction portion 20 in the second direction are formed by the axial end of one side of the side surfaces 23 on both sides of the second direction of the input arm portion 17. In the radially inner side surface 27 of the first side restriction portion 20, the middle part in the second direction is formed by a flat surface arranged substantially parallel to the radially inner side surface 16 of the input side engagement portion 14, and the two side portions in the second direction are formed by partially cylindrical convex surfaces that are inclined in a direction towards the outer side of the first direction as they move towards the two side sides of the second direction.

[0098] Preferably, the input arm 17 has a clearance groove 28 between the end face 25 on the axial side of one-sided limiting portion 20 and the radially inner surface 16 of the input-sided engaging portion 14. By providing the clearance groove 28, it is possible to prevent the axial movement of the engaging member 5 from being restricted by the end face 25 on the axial side of one-sided limiting portion 20 due to interference between the connecting portion and the engaging member 5 that connects the end face 25 on the axial side of one-sided limiting portion 20 and the radially inner surface 16 of the input-sided engaging portion 14.

[0099] The other-side limiting part 21 is disposed in the input arm 17 on the axially opposite side of the input-side engaging part 14, so that it can be inserted through the inside of the input-side engaging part 46 during the assembly of the reverse input cut-off clutch 1. Therefore, the other-side limiting part 21 needs to be configured to restrict the movement of the engaging member 5 to the axially opposite side, and the portion of the input arm 17 having the other-side limiting part 21 needs to be configured to be able to be inserted through the input-side engaging part 46 during assembly.

[0100] When a rotational torque is input to the input member 3, the input-side engaging portion 14 engages with the radially inner surface 16 of the input-side engaging portion 46. Therefore, in the assembled state of the reverse input cut-off clutch 1, the gap between the radially inner surface 16 of the input-side engaging portion 14 and the radially inner surface 48 of the input-side engaging portion 46 is set to a sufficiently small value. Therefore, in this example, to ensure a large engagement amount with the engaging member 5, the other-side restricting portion 21 has a structure that protrudes radially inward more than the input-side engaging portion 14. Specifically, the other-side restricting portion 21 is provided at the axially opposite end of the surface 24 on the first direction inner side of the input arm portion 17, and protrudes radially inward more than the radially inner surface 16 of the input-side engaging portion 14. In this example, the other-side restricting portion 21 is configured as a flange.

[0101] The other side limiting part 21 has an axial side end face 26 opposite to the axial side end face 54 of the engaging member 5. In this example, the axial side end face 26 of the other side limiting part 21 is formed by a flat surface that is substantially orthogonal to the central axis O of the input member 3.

[0102] The axial dimension D between the axial end face 25 of the one-sided limiting part 20 and the axial end face 26 of the other-sided limiting part 21 is slightly larger than the axial dimension d of the engaging member 5 (D > d). Therefore, it is possible to prevent the axial end face 25 of the one-sided limiting part 20 and the axial end face 26 of the other-sided limiting part 21 from becoming resistance to the radial movement of the engaging member 5.

[0103] In this example, the side surfaces on both sides of the other side restriction portion 21 in the second direction are formed by the axial ends of the side surfaces 23 on both sides of the input arm portion 17 in the second direction. In the radially inner side surface 29 of the other side restriction portion 21, the middle part in the second direction is formed by a flat surface arranged substantially parallel to the radially inner side surface 16 of the input side engagement portion 14, and the two side portions in the second direction are formed by partially cylindrical convex surfaces that are inclined in a direction towards the outer side of the first direction as they move towards the two side sides of the second direction.

[0104] Preferably, the input arm 17 has a clearance groove 30 between the end face 26 on the axial side of the other side limiting part 21 and the radially inner surface 16 of the input side engaging part 14. By providing the clearance groove 30, it is possible to prevent the axial movement of the engaging part 5 from being restricted by the end face 26 on the axial side of the other side limiting part 21 due to interference between the connecting part that connects the end face 26 on the axial side of the other side limiting part 21 and the radially inner surface 16 of the input side engaging part 14 and the engaging part 5.

[0105] The protrusion L of the one-sided limiting part 20 is equivalent to the radial dimension from the radial inner surface 16 of the input-side engaging part 14 to the radial inner surface 27 of the one-sided limiting part 20. 20 The protrusion L of the other side limiting part 21 is equivalent to the radial dimension from the radial inner surface 16 of the input side engaging part 14 to the radial inner surface 29 of the other side limiting part 21. 21 The size relationship is not specifically defined. The aforementioned protrusion L... 20 Able to exceed the above-mentioned protrusion amount L 21 Larger, and also more prominent than the aforementioned L. 21 Small, or can also be related to the above-mentioned prominent amount L 21 equal.

[0106] In this example, as Figure 6 As shown, the above-mentioned protrusion amount L 20 Compared to the above-mentioned protrusion L 21 Large. Specifically, the aforementioned prominent quantity L20 Having the above-mentioned protrusion L 21 It is approximately twice the size of the input arm 1. Therefore, during the assembly of the reverse input cut-off clutch 1, the axial end face 25 of the one-sided limiting part 20 on the other side can be used as a limiting surface for limiting the insertion amount of the input arm 17, in other words, a limiting surface for positioning the engaging member 5 relative to the input arm 17.

[0107] In this example, with the two force-applying members 55 positioned between the two engaging members 5 elastically deformed and the two engaging members 5 brought closer together until their respective protrusions 52 abut against each other, when the two input arms 17 are simultaneously inserted into the input-side engaging portions 46 of the two engaging members 5, the axial end face 25 of the one-sided limiting portion 20 provided on each of the two input arms 17 abuts against the axial end face 53 of each of the two engaging members 5. Therefore, the insertion depth of the input arm 17 can be limited by the axial end face 25 of the one-sided limiting portion 20. As a result, the input-side engaging portion 14 can be reliably and easily positioned inside the input-side engaging portion 46.

[0108] There is no particular limitation on the relationship between the axial dimension of one side restriction portion 20 and the axial dimension of the other side restriction portion 21. The axial dimension of one side restriction portion 20 may be larger than the axial dimension of the other side restriction portion 21, smaller than the axial dimension of the other side restriction portion 21, or equal to the axial dimension of the other side restriction portion 21.

[0109] In this example, the axial dimension of one-side limiting portion 20 is larger than the axial dimension of the other-side limiting portion 21. Therefore, the amount of protrusion of the input arm portion 17 from the end face 54 on the other side of the axial direction of the engaging member 5 can be suppressed, thereby achieving miniaturization of the axial dimension of the reverse input cut-off clutch 1. In addition, the rigidity of the input arm portion 17 can be ensured.

[0110] As in this example, when the input arm 17 has both a one-side restriction portion 20 and a other-side restriction portion 21, and both the one-side restriction portion 20 and the other-side restriction portion 21 are configured to protrude more radially inward than the input-side engaging portion 14, it is preferable that the distance from the central axis O of the input component 3 to the one-side restriction portion 20 is smaller than the distance from the central axis O of the input component 3 to the other-side restriction portion 21.

[0111] In this example, the input arm 17 is composed of two input arms 17 arranged on opposite sides, separated by the central axis O of the input component 3. Both the one-sided limiting portion 20 and the other-sided limiting portion 21 are configured to protrude radially inwards than the input-side engaging portion 14. Therefore, as... Figure 6As shown, the distance X between the radially inner surfaces 27 of the two side-restricting portions 20 is smaller than the distance Y between the radially inner surfaces 29 of the two side-restricting portions 21 (X < Y). That is, the distance (X / 2) from the central axis O of the input component 3 to the side-restricting portion 20 is smaller than the distance (Y / 2) from the central axis O of the input component 3 to the side-restricting portion 21 ((X / 2) < (Y / 2)).

[0112] The aforementioned distance Y is set to a size that allows the ends of the two input arms 17, each on the opposite axial side, to be simultaneously inserted into the input-side engaging portions 46 of the two engaging members 5. Specifically, in this example, as... Figure 7 As shown in (B), the aforementioned distance Y is greater than the distance Z1 between the radially inner surfaces 48 of the two input-side engaged portions 46 when the two force-applying members 55 disposed between the two engaging members 5 are elastically deformed and the two engaging members 5 are brought closer together so that the protrusions 52 of their respective engaging members 5 abut against each other (Y > Z1). Therefore, during the assembly operation of the reverse input cut-off clutch 1, the ends of the two input arms 17 on the opposite axial side can be simultaneously inserted into the input-side engaged portions 46 of the two engaging members 5.

[0113] Furthermore, the aforementioned distance Y is set to a size that prevents the two input arms 17 from disengaging from the engagement portions 46 on the input side of the two engagement members 5 when the reverse input cut-off clutch 1 is in use. Specifically, as Figure 7 As shown in (A), the distance Y is smaller than the distance Z2 between the radially inner surfaces 48 of the two input-side engaged portions 46 when the two engaging members 5 are closest to each other in the operating state of the reverse input cut-off clutch 1 (Y < Z2). Specifically, the distance Y is smaller than the distance Z2 between the radially inner surfaces 48 of the two input-side engaged portions 46 when the two engaging members 5 move towards each other radially inward based on their engagement with the input member 3 and the output-side engaged portions 47 of the two engaging members 5 clamp the output-side engaged portion 31 of the output member 4 (not shown) from both sides radially (Y < Z2). Therefore, it is possible to prevent the two input arms 17 from disengaging from the input-side engaged portions 46 of the two engaging members 5 in the operating state of the reverse input cut-off clutch 1.

[0114] Since the one-sided limiting part 20 does not need to be configured to allow insertion of the input-side locking part 46, its radial protrusion can be arbitrarily set within a range that does not make the weight of the input component 3 excessive and does not interfere with any structural elements of the output component 4. That is, the radial protrusion of the one-sided limiting part 20 can be sufficiently large. In this example, the protrusion L of the one-sided limiting part 20... 20 The amount of protrusion L of the other side limiting part 21 21 Large (i.e., X < Y). Therefore, the rigidity of the input arm 17 can be ensured.

[0115] The input component 3 can be rotatably supported on the pressed component 2 or other housing elements mentioned above.

[0116] [Output Components]

[0117] The output component 4 has an output-side engaging portion 31 located radially inward of the input-side engaging portion 14, and is coaxially arranged with the pressed surface 7. That is, the output component 4 is also coaxially arranged with the input component 3.

[0118] The output component 4 is configured to be connected to the output side mechanism, such as the reduction mechanism, on the other side of the axial direction, and to output rotational torque to the output side mechanism as it rotates. Specifically, the output component 4 is composed of the input shaft of the aforementioned output side mechanism, or it can be configured as a component different from the aforementioned input shaft, and is coaxially fixed to the aforementioned input shaft, etc. In this example, the output component 4 is coaxially fixed to the drive pulley 41, which serves as the input shaft of the reducer 40. A toothed belt 42 is suspended between the drive pulley 41 and a driven pulley (not shown).

[0119] In addition to the output side engaging part 31, the output component 4 also has an output shaft part 32.

[0120] The output-side engaging portion 31 and the output shaft portion 32 are directly connected in the axial direction. Specifically, the output-side engaging portion 31 protrudes from the end face 33 on one axial side of the output shaft portion 32 toward the axial side.

[0121] The output-side engaging portion 31 has a portion that engages with the output side engaging portion 47 of the engaging member 5, and is an element that receives rotational torque from the engaging member 5 when a rotational torque is input to the input member 3 and the engaging member 5 rotates. Additionally, when the rotational torque is input in the opposite direction to the output member 4, the engaging portion 47 engages with the output side of the engaging member 5, causing the engaging member 5 to move towards the pressed surface 7.

[0122] The portion of the output-side engaging portion 31 that engages with the output-side engaging portion 47 of the engaging member 5 is radially inward compared to the input-side engaging portion 14 and radially outward from the rotation center axis O of the output member 4. It is positioned to engage with the output-side engaging portion 47 of the engaging member 5. The output-side engaging portion 31 is configured such that its outer peripheral surface engages (contacts) with the output-side engaging portion 47 as the output member 4 or the engaging member 5 rotates.

[0123] The output-side engaging portion 31 has a cam function. The distance from the rotation center axis of the output component 4 to the outer peripheral surface of the output-side engaging portion 31, which engages with the output-side engaging portion 47, is not constant in the circumferential direction.

[0124] The number of portions in the output-side engaging portion 31 that engage with the output-side engaging portion 47 is determined by the number of engaging members 5. When multiple engaging members 5 are constituted, the output-side engaging portion 31 is also configured to have multiple such engaging portions. In this example, the number of output-side engaging portions 31 matches the number of engaging members 5, and it is configured to have two portions that engage with the output-side engaging portion 47.

[0125] When the output-side engaging portion 31 is cut by an imaginary plane orthogonal to the rotation center axis O of the output component 4, the cross-sectional shape of the output-side engaging portion 31 can be arbitrarily selected as long as the output-side engaging portion 31 has a cam function. For example, it can be a square, rectangle, parallelogram, trapezoid, or other quadrilateral, oval, or a shape similar to these quadrilaterals or ovals.

[0126] In this example, as Figure 8 As shown, the output-side engaging portion 31, when cut by an imaginary plane orthogonal to the rotation center axis O of the output component 4, has a generally rectangular cross-sectional shape. More specifically, the outer peripheral surface of the output-side engaging portion 31 is composed of two parallel flat surfaces 34 and two convex curved surfaces 35, each of which is partially cylindrical.

[0127] In this example, the output-side engaging portion 31 is symmetrical with respect to an imaginary plane that passes through the rotation center axis O of the output member 4 and is orthogonal to the two flat surfaces 34. Furthermore, the output-side engaging portion 31 is symmetrical with respect to an imaginary plane that passes through the rotation center axis O of the output member 4 and is parallel to the two flat surfaces 34. That is, the output-side engaging portion 31 has a shape that is twice symmetrical about the central axis of the output member 4. The output-side engaging portion 31 is disposed radially inside the two input-side engaging portions 14, and the output sides of the two engaging members 5 are engaged with each other by the engaging portion 47.

[0128] The output shaft 32 is an element that connects the output component 4 and the input part of the output side mechanism in a way that can transmit rotational torque.

[0129] In this example, the output shaft portion 32 has a stepped cylindrical shape. Specifically, the output shaft portion 32, starting from one axial side, has a large diameter portion 36, a medium diameter portion 37, and a small diameter portion 38 in sequence. The large diameter portion 36 has an outwardly projecting flange portion 39 that protrudes radially outward throughout its entire circumference at the axial middle portion of its outer peripheral surface. In this example, the drive pulley 41 of the reducer 40 is fixedly fitted onto the medium diameter portion 37.

[0130] In this example, the large-diameter portion 36 of the output shaft portion 32 is supported to be rotatable relative to the pressed member 2. Specifically, the large-diameter portion 36 of the output shaft portion 32 is supported by a radial rolling bearing 43a to be rotatable relative to the pressed member 2. The radial rolling bearing 43a is axially held between an outward flange portion 39 provided on the outer peripheral surface of the large-diameter portion 36 and an inward flange portion 12 provided on the inner peripheral surface of the pressed member 2.

[0131] In this example, the connection between the end face 33 on the axial side of the output shaft portion 32 and the outer peripheral surface of the output side engagement portion 31 of the output component 4 has a corner R portion 44 with a concave arc-shaped cross-sectional shape.

[0132] In this example, the output-side engagement portion 31 is provided at the axial end of the output component 4. However, the output component 4 may also have, for example, a shaft portion on the axial side of the output-side engagement portion 31, which is used to insert into the inside of the input shaft portion 18 to improve the coaxiality between the output component 4 and the input component 3.

[0133] [Card assembly]

[0134] The engaging member 5 has a pressing surface 45 opposite to the pressed surface 7, an input-side engaging portion 46 that can engage with the input-side engaging portion 14, and an output-side engaging portion 47 that can engage with the output-side engaging portion 31, and is configured to be movable in a first direction relative to the pressing surface 7 in a near-far direction.

[0135] The engaging member 5 is configured such that when a rotational torque is input to the input member 3, the engaging member 5 moves in a first direction in a direction separating from the pressed surface 7, based on the engagement of the input-side engaging part 14 and the input-side engaged part 46, and by engaging the output-side engaged part 47 with the output-side engaging part 31, the rotational torque input to the input member 3 is transmitted to the output member 4. Conversely, when a rotational torque is input to the output member 4 in the opposite direction, the engaging member 5 pushes the pressing surface 45 against the pressed surface 7, based on the engagement of the output-side engaging part 31 and the output-side engaged part 47, so that the pressing surface 45 and the pressed surface 7 are engaged by friction.

[0136] The input-side engaging part 46 is inserted through the input arm 17 of the input component 3 and engages with the input-side engaging part 14 as the input component 3 rotates, receiving the rotational torque input from the input component 3.

[0137] The shape of the input-side engaging portion 46 is not limited as long as it is configured to have the input-side engaging portion 14 disposed on its inner side and can engage with the input-side engaging portion 14. The input-side engaging portion 46 is open on one axial end face 53 and the other axial end face 54 of the engaging member 5. The input-side engaging portion 46 is formed by a through hole that opens only on one axial end face 53 and the other axial end face 54 of the engaging member 5, or by cutouts that open on one axial end face 53, the other axial end face 54, and the radially outer surface of the engaging member 5.

[0138] In this example, the input-side engaging portion 46 is formed by a through hole that axially passes through the engaging member 5. The input arm portion 17 is inserted through the input-side engaging portion 46. An input-side engaging portion 14, which is provided on a portion of the input arm portion 17 in the axial direction, is disposed inside the input-side engaging portion 46. The input-side engaging portion 46 is open only on one end face 53 in the axial direction and on the other end face 54 of the engaging member 5. The input-side engaging portion 46 is provided in the radial middle portion of the central portion in the width direction of the engaging member 5.

[0139] The input-side engaging portion 46 is sized to allow for loose insertion into the input-side engaging portion 14. Therefore, when the input-side engaging portion 14 is inserted into the inner side of the input-side engaging portion 46, gaps exist between the inner surfaces of the input-side engaging portion 14 and the input-side engaging portion 46 in both the width and radial directions of the engaging member 5. Consequently, the input-side engaging portion 14 can be displaced relative to the input-side engaging portion 46 in the rotational direction of the input member 3, and the input-side engaging portion 46 can be displaced radially relative to the input-side engaging portion 14.

[0140] In this example, on the inner surface of the input-side engaging portion 46, the radially inner surface 48 facing radially outward is formed by a flat surface orthogonal to the first direction, and the radially outer surface 49 facing radially inward on the inner surface of the input-side engaging portion 46 is formed by a curved surface having a generally arcuate profile shape when viewed from the axial direction, or a composite surface having a generally V-shaped profile shape. The circumferential side surface 50 connecting the ends of the radially inner surface 48 and the ends of the radially outer surface 49 in the second direction is formed by a partially cylindrical concave curved surface.

[0141] The output-side engaging portion 47 is an element that engages with the output-side engaging portion 31 as the engaging member 5 rotates, and outputs the rotational torque input from the input member 3 to the engaging member 5 to the output member 4. The shape of the output-side engaging portion 47 is not limited as long as it is configured to engage with the output-side engaging portion 31. In this example, the output-side engaging portion 47 is located at the center of the radially inner surface of the engaging member 5 in the width direction.

[0142] The pressing surface 45 is provided on the radially outer surface of the engaging member 5 opposite to the pressed surface 7. The shape and size of the pressing surface 45 can be arbitrarily selected as long as it can frictionally engage with the pressed surface 7. The pressing surface 45 can be formed entirely of the radially outer surface of the engaging member 5, or it can be formed from a part of it. One pressing surface 45 or multiple pressing surfaces 45 can be provided for one engaging member 5. The radius of curvature of the pressing surface 45 can be the same as the radius of curvature of the pressed surface 7, or it can be smaller than the radius of curvature of the pressed surface 7.

[0143] In this example, the pressing surface 45 is composed of two pressing surfaces 45 located at two circumferentially separated positions on the radially outer surface of the engaging member 5. Each pressing surface 45 is composed of a partially cylindrical convex surface having a radius of curvature smaller than that of the pressed surface 7.

[0144] When viewed from the axial direction, the portion of the radially outer surface of the engaging member 5 that deviates circumferentially from the two pressing surfaces 45 exists radially inward than the circumscribed circle centered on the rotation center O of the input member 3 and in contact with the two pressing surfaces 45. That is, when the two pressing surfaces 45 are in contact with the pressed surface 7, the portion that deviates circumferentially from the two pressing surfaces 45 does not contact the pressed surface 7.

[0145] Preferably, compared to other parts of the engaging member 5, the pressing surface 45 has a surface characteristic with a higher coefficient of friction than the pressed surface 7. Furthermore, the pressing surface 45 can be integrally formed with other parts of the engaging member 5, or it can be formed from the surface of a friction element fixed to other parts of the engaging member 5 by bonding or the like.

[0146] The snap-fit ​​component 5 can be composed of two snap-fit ​​components 5 or more than three snap-fit ​​components 5.

[0147] The snap-fit ​​part 5 can be manufactured by any method. For example, the snap-fit ​​part 5 can be manufactured by stamping-based punching, sintering, forging, casting, and / or machining. In this example, the snap-fit ​​part 5 is a stamped form of a metal sheet manufactured by stamping-based punching.

[0148] The shape of the locking component 5 can be arbitrarily selected as long as it has a pressing surface 45, an input-side locking portion 46 and an output-side locking portion 47 and can perform the above-mentioned functions. Existing locking component shapes can also be widely adopted.

[0149] In this example, the engaging member 5 is composed of two engaging members 5. Each engaging member 5 has the function of being an engaging member 5. Each engaging member 5 has an end face shape that is approximately semi-circular when viewed from the axial direction, and has a shape that is symmetrical about the width direction.

[0150] In this example, the engaging member 5 has a flat surface 51 on its radially inner side that is orthogonal to the radial direction of the engaging member 5, and two protrusions 52 protruding radially inward at two locations in the width direction of the flat surface 51. Furthermore, the output-side engaging portion 47 is formed by the portion of the flat surface 51 that exists in the width direction between the two protrusions 52. In addition, in this example, the width dimension of the output-side engaging portion 47, i.e., the distance between the two protrusions 52, is larger than the width dimension of the flat surface 34 of the output-side engaging portion 31.

[0151] In the reverse input cut-off clutch 1 of this example, with the pressing surfaces 45 of the two engaging members 5 facing opposite sides radially and the flat surfaces 51 facing each other, each engaging member 5 is arranged radially inside the housing element 8, allowing movement in a first direction. Furthermore, the two input arms 17 of the input member 3, located on one axial side, pass axially through the respective input-side engaging portions 46 of the two engaging members 5, and the output-side engaging portion 31 of the output member 4, located on the other axial side, is inserted axially between the output-side engaging portions 47 of the two engaging members 5. That is, the two engaging members 5 are configured to clamp the output-side engaging portion 31 from the radial outside through their respective output-side engaging portions 47.

[0152] The inner diameter of the pressed surface 7 and the radial dimension of the engaging member 5 are limited such that, when the two engaging members 5 are arranged radially inside the pressed member 2, at least one of the portions between the pressed surface 7 and the two pressed surfaces 45 and the portions between the front ends of the two combinations of the protrusions 52 formed by the two protrusions 52 of the two engaging members being opposed to each other exists.

[0153] In this example, the engaging member 5 has a constant axial dimension d throughout its radial direction. The end face 53 on one axial side and the end face 54 on the other axial side of the engaging member 5 are arranged parallel to each other and are each configured as a flat surface. In addition, the radially inner surface 48 of the engaging portion 46 on the input side of the engaging member 5 and the end face 53 on one axial side and the end face 54 on the other axial side are connected at right angles.

[0154] [Force-applying component]

[0155] The reverse input cut-off clutch 1 in this example also has a force-applying component 55 as an arbitrary constituent element.

[0156] The force-applying component 55 elastically applies force to the engaging member 5 in a direction closer to the pressed surface 7. The force-applying component 55 can be made of springs such as leaf springs, coil springs, and disc springs, or elastic materials such as rubber, elastomers, and synthetic resins. The number of force-applying components 55 is not particularly limited and can be appropriately determined according to the number of engaging members 5.

[0157] In this example, the force-applying component 55 consists of two force-applying components 55 positioned at two locations in the width direction between the radially inner sides of the two engaging members 5, and each force-applying component 55 is composed of a compression coil spring. A protrusion 52 is inserted into the inner side of the ends on both sides in the elongation direction of each force-applying component 55. This prevents the force-applying component 55 from dislodging from the portion between the two engaging members 5.

[0158] The two force-applying components 55 elastically apply force to the two engaging members 5 in a direction closer to the pressed surface 7 by means of a force that is elastically restoring. Thus, in a neutral state where no torque is applied to the input component 3 and the output component 4, the pressing surfaces 45 of the two engaging members 5 are in contact with the pressed surface 7.

[0159] [Supporting Components]

[0160] The reverse input cut-off clutch 1 in this example also has a support component 56 as an arbitrary constituent element.

[0161] The support member 56 is an element used to rotatably support the axial end (small diameter portion 38) of the output shaft portion 32 on the other side.

[0162] The support member 56 includes a bearing retainer 57 having a cylindrical shape, a partially cylindrical portion 58 extending circumferentially from one end of the bearing retainer 57 toward one side of the axial direction, and an outwardly extending flange portion 59 extending radially outward from one end of the partially cylindrical portion 58.

[0163] The support member 56 is supported and fixed to the housing element 8 by threading a bolt 61, which is inserted into the through hole 60 provided in the outward flange portion 59, into the threaded hole 13 provided in the housing element 8.

[0164] The axial end (small diameter portion 38) of the output shaft portion 32 is rotatably supported on the support member 56 via a radial rolling bearing 43b held in the bearing retainer portion 57.

[0165] Furthermore, in the illustrated example, the radial rolling bearings 43a and 43b that rotatably support the output shaft 32 are respectively constructed from ball bearings using balls as rolling elements. However, the radial rolling bearings supporting the output shaft 32 can also be constructed from tapered roller bearings using tapered rollers as rolling elements or roller bearings using cylindrical rollers. In addition, different types of bearings can be used as radial rolling bearings 43a and 43b.

[0166] <Instructions for Reverse Input Clutch Disengagement>

[0167] use Figure 9 as well as Figure 10The operation of the reverse input disengagement clutch 1 in this example will be explained. Furthermore, Figure 9 and Figure 10 The force-applying component 55 is omitted, and the radial clearance between the input component 3 and the output component 4 and the two engaging components 5 is exaggerated.

[0168] When a rotational torque is input to the input component 3, regardless of the rotation direction of the input component 3, the two engaging parts 5 move in the direction of separation from the pressed surface 7. More specifically, as... Figure 9 As shown, the input-side engaging portion 14 is located inside the input-side engaging portion 46 in the rotational direction of the input component 3 (in... Figure 9 In the example, it rotates counterclockwise.

[0169] This reduces the gap between the radial inner surface 16 of the input-side engaging portion 14 and the radial inner surface 48 of the input-side engaged portion 46, bringing the radial inner surface 16 of the input-side engaging portion 14 into contact with the radial inner surface 48 of the input-side engaged portion 46.

[0170] From this state, when the input component 3 rotates further, the radially inner surface 16 of the input-side engaging portion 14 presses the radially inner surface 48 of the input-side engaging portion 46 toward the radially inner side, causing the engaging member 5 to move in the direction of separation from the pressed surface 7. That is, the two engaging members 5 move toward each other in a radially inner direction based on their engagement with the input component 3, and the radially inner surfaces of the two engaging members 5 come closer to each other, so that the output-side engaging portion 31 of the output component 4 is clamped from both radial sides by the output-side engaging portions 47 of the two engaging members 5.

[0171] In this way, while rotating the output component 4 so that the flat surface 34 of the output-side engaging portion 31 is parallel to the output-side engaged portion 47, the output-side engaging portion 31 and the output-side engaged portion 47 of the engaging member 5 are engaged without wobbling. As a result, the rotational torque input to the input component 3 is transmitted to the output component 4 via the two engaging members 5 and output from the output component 4.

[0172] When a rotational torque is input in the opposite direction to the output component 4, regardless of the rotation direction of the output component 4, the two engaging parts 5 move towards the pressed surface 7. Specifically, as follows: Figure 10 As shown, the output-side engaging portion 31 is located on the output side of the two engaging members 5, and the engaging portion 47 is located on the inner side of each other along the rotation direction of the output member 4. Figure 10 (In the example, it is clockwise) Rotation. Through the flat surface 34 in the outer peripheral surface of the output side engaging part 31, the output side engaging part 47 is pressed radially outward, and the two engaging parts 5 move towards the pressed surface 7.

[0173] That is, the two engaging parts 5 move radially outward in the direction of separation from each other based on their engagement with the output part 4, and the pressing surfaces 45 of the two engaging parts 5 contact the pressed surfaces 7 and engage with each other friably relative to the pressed surfaces 7.

[0174] As a result, the rotational torque input to the output component 4 in the reverse direction is completely cut off and not transmitted to the input component 3, or only a portion of the rotational torque input to the output component 4 in the reverse direction is transmitted to the input component 3 while the remainder is cut off.

[0175] In order to completely cut off the rotational torque input to the output component 4 and prevent it from being transmitted to the input component 3, so that the pressing surface 45 of the engaging member 5 does not slide relative to the pressed surface 7 (relative rotation), the engaging member 5 protrudes (clamps) between the output side engaging part 31 and the pressed component 2, thereby locking the output component 4.

[0176] In order to transmit only a portion of the rotational torque input to the output component 4 in the reverse direction to the input component 3 and cut off the remaining portion, the locking member 5 is made to slide relative to the pressed surface 7 so that the locking member 5 protrudes (clamps) between the pressed components 2 in the output side locking part 31, thus partially locking the output component 4.

[0177] In the reverse input cut-off clutch 1 of this example, the size of the gap between each component is adjusted to enable the above operation. In particular, when the pressing surface 45 of the two engaging members 5 is in contact with the pressed surface 7, there is a gap between the radial inner surface 16 of the input side engaging part 14 and the radial inner surface 48 of the input side engaged part 46.

[0178] Therefore, when a rotational torque is input to the output component 4 in the opposite direction, the movement of the locking member 5 to the radially outward direction can be prevented from being blocked by the input-side locking part 14. Moreover, after the pressing surface 45 contacts the pressed surface 7, the surface pressure acting on the contact part between the pressing surface 45 and the pressed surface 7 also changes according to the magnitude of the rotational torque input to the output component 4 in the opposite direction, so that the locking or semi-locking of the output component 4 is performed appropriately.

[0179] In the reverse input cut-off clutch 1 of this disclosure, the input arm portion 17 inserted into the input side of the engaging portion 46 of the engaging member 5 in the input component 3 has at least one of a one-sided limiting portion 20 that restricts the movement of the engaging member 5 to one axial side and an other-sided limiting portion 21 that restricts the movement of the engaging member 5 to the other axial side. Therefore, dedicated components for restricting the movement of the engaging member 5 to one axial side and / or for restricting the movement of the engaging member 5 to the other axial side are unnecessary. Therefore, the reverse input cut-off clutch 1 of this disclosure can reduce the number of components and improve assemblability.

[0180] [Second Example]

[0181] use Figure 11 A second example of an embodiment of this disclosure will be described.

[0182] The construction of the input arm 17a of the input component 3a of the reverse input cut-off clutch 1a in this example is different from the construction of the input arm 17 in the first example.

[0183] The input arm 17a has an input-side engaging portion 14 and a one-side limiting portion 20 for limiting the movement of the engaging member 5 to one axial side, but does not have a other-side limiting portion for limiting the movement of the engaging member 5 to the other axial side.

[0184] In this example, the reverse input cut-off clutch 1a has a gasket 62 between the end face 54 on the other side of the axial direction of the engaging member 5 and the end face 33 on the one side of the axial direction of the output shaft portion 32 of the output member 4 in order to limit the movement of the engaging member 5 to the other side of the axial direction.

[0185] In this example, the movement of the engaging member 5 toward one axial side can be directly restricted by the one-sided limiting part 20 provided on the input member 3a, thus eliminating the need for a dedicated part to restrict the movement of the engaging member 5 toward one axial side. Furthermore, there are no limitations during assembly caused by the presence of the other-sided limiting part 21. Therefore, the number of parts can be reduced, and assemblability can be improved.

[0186] The structure and function of the other components in the second example are the same as those in the first example.

[0187] [Third Case]

[0188] use Figure 12 A third example of an embodiment of this disclosure will be described.

[0189] The construction of the input arm 17b of the input component 3b of the reverse input cut-off clutch 1b in this example is different from the construction of the input arm 17 in the first example and the input arm 17a in the second example.

[0190] The input arm 17b has an input-side engaging portion 14 and an other-side limiting portion 21 for limiting the movement of the engaging member 5 to the other axial side, but does not have a one-side limiting portion for limiting the movement of the engaging member 5 to one axial side.

[0191] In this example, the reverse input cut-off clutch 1b has a limiting member 63 at the axial end of the output component 4 and a gasket 64 disposed between the limiting member 63 and the end face 53 of the engagement component 5 on the other axial side in order to limit the movement of the engagement member 5 to one side.

[0192] In this example, by means of the limiting part 21 provided on the other side of the input component 3b, the movement of the engaging member 5 to the other axial side can be limited, thus eliminating the need for a dedicated component to limit the movement of the engaging member 5 to the other axial side. Therefore, the number of components can be reduced, and assemblability can be improved.

[0193] The structure and function of the other components in the third example are the same as those in the first example.

Claims

1. A reverse input cut-off clutch, characterized in that, have: The pressed component has a pressed surface on its inner circumferential surface; The input component has an input-side engaging portion disposed radially inside the pressed surface, is connected to an input-side mechanism on one axial side, and is coaxially disposed with the pressed surface. An output component having an output-side engaging portion disposed radially inward of the input-side engaging portion, connected axially to an output-side mechanism on the other side, and coaxially disposed with the pressed surface; and The engaging member has a pressing surface facing the pressed surface, an input-side engaging portion capable of engaging with the input-side engaging portion, and an output-side engaging portion capable of engaging with the output-side engaging portion, and is configured to be radially movable. When a rotational torque is input to the input component, the engaging member moves radially in a direction separating from the pressed surface, based on the engagement of the input-side engaging portion and the input-side engaged portion. By engaging the output-side engaged portion with the output-side engaging portion, the rotational torque input to the input component is transmitted to the output component. Conversely, when a rotational torque is input to the output component in the opposite direction, the engaging member presses the pressing surface against the pressed surface, causing frictional engagement between the pressing surface and the pressed surface, based on the engagement of the output-side engaging portion and the output-side engaged portion. The aforementioned input component has an input-side engaging portion in a portion along its axial direction, and also has an input arm portion that axially passes through the input-side engaging portion. The input arm has at least one of a one-sided limiting portion and a other-sided limiting portion. The one-sided limiting portion is disposed on a portion axially closer to the input-side engaging portion and restricts the movement of the engaging member relative to the input component on one axial side. The other-sided limiting portion is disposed on a portion axially closer to the input-side engaging portion and restricts the movement of the engaging member relative to the input component on the other axial side.

2. The reverse input cut-off clutch according to claim 1, characterized in that, The aforementioned input arm has the aforementioned other side limiting portion. The aforementioned other side limiting part protrudes radially inward more than the aforementioned input side engaging part.

3. The reverse input cut-off clutch according to claim 1 or 2, characterized in that, The aforementioned input arm has the aforementioned one-sided limiting portion. The aforementioned one-sided limiting portion protrudes further in the diameter direction of the aforementioned input arm portion than the aforementioned input-side engaging portion.

4. The reverse input cut-off clutch according to claim 3, characterized in that, The aforementioned one-sided limiting part protrudes radially inward more than the aforementioned input-side engaging part.

5. The reverse input cut-off clutch according to any one of claims 1 to 4, characterized in that, The aforementioned input arm has both the aforementioned one-side limiting portion and the aforementioned other-side limiting portion.

6. The reverse input cut-off clutch according to claim 5, characterized in that, Both the aforementioned one-side limiting portion and the aforementioned other-side limiting portion protrude radially inwards than the aforementioned input-side engaging portion. The distance from the central axis of the input component to the one-sided limiting part is smaller than the distance from the central axis of the input component to the other-sided limiting part.

7. The reverse input cut-off clutch according to any one of claims 1 to 6, characterized in that, The aforementioned input arm consists of two input arms. The two input arms are positioned on opposite sides, separated by the central axis of the input component. The aforementioned locking mechanism consists of two locking components.

Images