Reverse input disengagement clutch

Abstract

This disclosure provides a reverse input cut-off clutch that reduces the number of components and prevents stress concentration in the output component. The output-side engagement portion (19) of the output component (4) has an output-side engagement surface (21) on its outer peripheral surface that engages with the output-side engagement portion (46). The output shaft portion (20) has a groove (26) on one axial side of its outer peripheral surface, where the circumferential phase coincides with the output-side engagement surface (21). This second imaginary plane is orthogonal to a first imaginary plane containing the circumferential ends of the output-side engagement surface (21) and contains the central axis of the output component (4). The groove shape of the cross-section of the groove (26) on the second imaginary plane is approximately U-shaped or approximately C-shaped.

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] Therefore, in the reverse input cut-off clutch described in International Publication No. 2023 / 136149, the axial movement of the engaging member relative to the output member is limited by two gaskets and a stop ring as a limiting member. Specifically, the axial movement of the engaging member relative to the output member is limited by placing a gasket between the stop ring, which is locked at the end of the output member, and the engaging member, and by placing a gasket between the side of the engaging member opposite to the side of the stop ring and the axial end face of the output shaft portion of the output member, which is positioned axially adjacent to the engaging portion on the output side.

[0011] In the reverse input cut-off clutch described in International Publication No. 2023 / 136149, shims are required on both axial sides of the engaging component, which increases the number of parts, resulting in inconveniences such as increased component management costs and assembly time.

[0012] In order to omit the gaskets located between the engaging member and the axial end face of the output shaft in the two gaskets installed in the reverse input cut-off clutch, it is considered to directly restrict the axial movement of the engaging member through the axial end face of the output shaft.

[0013] However, in order to prevent stress concentration, the connection between the axial end face of the output shaft and the output side engagement surface of the engagement member engaged by the engagement part is provided with an angle R with a large radius of curvature.

[0014] Therefore, when the axial movement of the engaging member is directly restricted through the axial end face of the output shaft, the corner radius (R) and the engaging member will interfere, making it difficult to properly restrict the axial movement of the engaging member. If the radius of curvature of the corner radius (R) is reduced, the axial movement of the engaging member can be properly restricted. However, simply reducing the radius of curvature of the corner radius (R) will cause stress concentration at the corner radius (R), which may cause damage to the corner radius (R).

[0015] The purpose of this disclosure is to realize a reverse input cut-off clutch structure that can reduce the number of parts and prevent stress concentration in the output parts.

[0016] Solution for solving the problem

[0017] 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.

[0018] The aforementioned pressed component has a pressed surface on its inner circumferential surface.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 and 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.

[0023] The aforementioned output-side engaging portion has an output-side engaging surface on its outer peripheral surface that engages with the aforementioned output-side engaging portion.

[0024] The aforementioned output component has an output shaft portion, which has at least a portion of an end face that is axially opposed to the aforementioned engaging member on one side.

[0025] The end face of the output shaft on one side of the axial direction and the engagement surface on the output side are connected via a corner R portion.

[0026] The portion of the output shaft portion on one side of the outer circumferential surface whose phase in the circumferential direction coincides with the output side engagement surface has a groove that extends linearly in a direction orthogonal to a second imaginary plane. This second imaginary plane is orthogonal to a first imaginary plane passing through the ends of the output side engagement surface on both sides in the circumferential direction and includes the central axis of the output component.

[0027] The groove shape of the cross section of the aforementioned groove on the aforementioned second imaginary plane is approximately U-shaped or approximately C-shaped.

[0028] In a reverse input cut-off clutch according to one aspect of the present disclosure, the groove shape of the cross section of the groove portion can be approximately U-shaped, and the inner surface of the groove portion can be composed of a first inner surface that is flat on one side of the axial direction, a second inner surface that is flat on the other side of the axial direction, and a bottom surface connecting the first inner surface and the second inner surface.

[0029] When the inner surface of the groove is composed of the first inner side, the second inner side, and the bottom surface, the bottom surface can be composed of a partially cylindrical concave curved surface with a single radius of curvature.

[0030] When the inner surface of the groove is composed of the first inner side, the second inner side, and the bottom surface, the bottom surface can have: a first curved surface connected to the first inner side and having a concave arc cross-sectional shape; and a second curved surface connected to the second inner side and having a concave arc cross-sectional shape.

[0031] When the bottom surface has the first curved surface and the second curved surface, the bottom surface can have a bottom plane portion arranged substantially parallel to the output side engagement surface in the axial direction between the first curved surface and the second curved surface.

[0032] When the bottom surface has the first curved surface and the second curved surface, the radius of curvature of the first curved surface can be larger than the radius of curvature of the second curved surface.

[0033] When the radius of curvature of the first curved surface is larger than the radius of curvature of the second curved surface, the radius of curvature of the second inner surface can be made to be the same size as the radius of curvature of the corner R.

[0034] In one aspect of the reverse input cut-off clutch disclosed herein, the radial distance from the central axis of the output component to the groove portion can be made to be 0.85 times or more and 1.25 times or less the radial distance from the central axis of the output component to the output-side engagement surface.

[0035] In one aspect of the reverse input cut-off clutch disclosed herein, the axial groove width of the opening of the groove portion can be made larger than the axial dimension from the end face of the output shaft portion on one side of the axial direction to the opening of the groove portion.

[0036] In one aspect of the reverse input cut-off clutch disclosed herein, the output-side engagement surface can be formed by two output-side engagement surfaces arranged in parallel to each other, and the groove portion can be formed by two groove portions arranged on opposite sides of the outer peripheral surface of the output shaft portion in the diametrical direction.

[0037] In one aspect of the reverse input cut-off clutch disclosed herein, a small axial gap is possible between the end face of the output shaft on one axial side and the end face of the engaging member on the other axial side.

[0038] The effects of the invention

[0039] According to the reverse input cut-off clutch construction of one aspect of the present disclosure, it is possible to reduce the number of components and prevent stress concentration in the output component. Attached Figure Description

[0040] 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.

[0041] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0042] Figure 3 This is a perspective view showing the axial side portion of the reverse input cut-off clutch in the first example, omitting a locking component, a pressed component, and an input component.

[0043] Figure 4 This is a cross-sectional view showing the output section taken out from the reverse input disconnect clutch in the first example.

[0044] Figure 5 yes Figure 4 A magnified view of a portion of the image.

[0045] Figure 6 yes Figure 1 Sectional view I-I.

[0046] Figure 7 This omits the force-applying component to represent the state of rotational torque input to the input component. Figure 1 Sectional view I-I.

[0047] Figure 8 This indicates the state of the rotational torque input / output components by omitting the force-applying components. Figure 1 Sectional view I-I.

[0048] Figure 9 It represents the radial distance D. 26 With radial distance D 21 A graph showing the relationship between the ratio and the magnitude of the maximum torque at which no plastic deformation occurs at angle R 25.

[0049] Figure 10 This represents the second example of an embodiment of the present disclosure, where the reverse input cut-off clutch is equivalent to... Figure 5 The image.

[0050] Figure 11 R represents the radius of curvature of the second curved face 33. 33 The radius of curvature R of the angle R25 25 A graph showing the relationship between the ratio and the magnitude of the maximum shear stress acting on the 25° angle.

[0051] 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 5 The image.

[0052] Figure 13 (A)~ Figure 13 (E) is a cross-sectional view showing the output components used in the simulation. Figure 13 (A) represents Example 1. Figure 13 (B) represents Example 2. Figure 13 (C) indicates Example 3. Figure 13 (D) indicates comparison example 1. Figure 13 (E) indicates comparison example 2.

[0053] In the picture:

[0054] 1—Reverse input cut-off clutch, 2—Pressed component, 3—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, 15—Input shaft, 16—Radial inner surface, 17—Input flange, 18—Radial outer surface, 19—Output side engagement part, 20—Output shaft, 21—Output side engagement surface, 22—Convex curved surface, 23—End face, 24—Restriction part, 25—Angle R part, 26—Groove, 27—Inner surface, 28—Opening, 29—First inner surface, 30—Second inner surface, 31—Bottom surface, 32—First curved surface, 33—Second curved surface, 34—Bottom plane, 35—Convex Side, 36—Large diameter section, 37—Medium diameter section, 38—Small diameter section, 39—Outward flange section, 40—Reducer, 41—Drive pulley, 42a, 42b—Radial rolling bearings, 43—Mounting shaft section, 44—Pressing surface, 45—Input side engaged section, 46—Output side engaged section, 47—Radial inner surface, 48—Radial outer surface, 49—Circumferential side, 50—Flat surface section 51—Protrusion, 52—End face, 53—End face, 54—Limiting component, 55—Pad, 56—End face, 57—End face, 58—Through hole, 59—Force-applying component, 60—Supporting component, 61—Bearing retainer, 62—Partial cylindrical part, 63—Outward flange, 64—Through hole, 65—Bolt, 66—Toothed strip, 67—End face, 68—Locking groove, 69—Minimum gap. Detailed Implementation

[0055] [First example]

[0056] use Figures 1-9 The reverse input cut-off clutch of the first embodiment of the present disclosure will be described.

[0057] 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. Figure 1 , Figure 2 , Figure 4 as well as Figure 5 The right side), the other axial side refers to the output side of the reverse input cut-off clutch 1 ( Figure 1 , Figure 2 , Figure 4 as well as Figure 5 (Left side).

[0058] <Explanation of the construction of the reverse input cut-off clutch>

[0059] 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.

[0060] 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 input part 3, and the engaging part 5.

[0061] 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 19 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 44 opposite to the pressed surface 7, an input-side engaged portion 45 capable of engaging with the input-side engaged portion 14, and an output-side engaged portion 46 capable of engaging with the output-side engaged portion 19, and is configured to be radially movable.

[0062] 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 45, and by engaging the output-side engaged part 46 with the output-side engaging part 19, the rotational torque input to the input component 3 is transmitted to the output component 4.

[0063] Conversely, when a rotational torque is input to the output component 4 in the opposite direction, the engaging part 5 pushes the pressing surface 44 against the pressed surface 7 based on the engagement of the output-side engaging part 19 and the output-side engaged part 46, causing the pressing surface 44 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.

[0064] Furthermore, in this specification, the direction of the pressing surface 44 of the engaging member 5 relative to the pressed surface 7 is defined as the first direction ( Figures 6-8 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 6-8 (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 6 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 6 (The direction is indicated by the arrow β in the image).

[0065] The input-side engaging portion 14 of the input component 3 and the output-side engaging portion 19 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 order of input-side engaging portion 14, input-side engaged portion 45, output-side engaged portion 46, and output-side engaging portion 19. Furthermore, the input-side engaging portion 14, the output-side engaging portion 19, and the engaging member 5 are rotatable radially inside the pressed surface 7.

[0066] In particular, the reverse input cut-off clutch 1 of this disclosure is characterized by the following: by modifying the output member 4, stress concentration is eliminated in the output member 4, and the axial movement of the engaging member 5 can be directly restricted by the output member 4. Hereinafter, the constituent elements of the reverse input cut-off clutch 1 will be described with a focus on the structure of the output member 4.

[0067] [Pressed component]

[0068] 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 44 of the engaging component 5. That is, the pressed surface 7 has the function of frictionally engaging with the pressing surface 44 of the engaging component 5 when the rotational torque is input to the output component 4 in the opposite direction.

[0069] The pressed part 2 is supported on a fixed part that does not rotate when the reverse input cut-off clutch 1 is in use, or it is integrally provided on the fixed part so that its rotation is constrained.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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, by fitting (embedding) the other housing elements into the end of the housing element 8 on one axial side without wobbling, and thus positioning the housing element 8 and the other housing elements in the radial direction, the housing element 8 and the other housing elements are joined together by a connecting member such as bolts to form the pressed part 2.

[0075] [Input Component]

[0076] 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.

[0077] 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.

[0078] The input-side engaging portion 14 is located radially outward from the rotation center of the input component 3, and has a portion that engages with, specifically contacts, the input-side engaging portion 45 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 47 of the input-side engaging portion 45 as the input component 3 or the engaging member 5 rotates.

[0079] In this example, the input component 3, in addition to the input side engaging portion 14, also has an input shaft portion 15 and an input flange portion 17.

[0080] The input shaft portion 15 is an element that connects the input-side mechanism and the input component 3 in a manner that enables the transmission of rotational torque. In this example, the input shaft portion 15 has a cylindrical shape. The input component 3 is connected to the output shaft of the input-side mechanism in a torque-transmitting manner, for example, by non-circular engagement, such as spline engagement, between the inner circumferential surface of the input shaft portion 15 and the outer circumferential surface of the output shaft of the input-side mechanism such as an electric motor, or by pressing or the like, in a manner that enables the transmission of torque.

[0081] The input flange 17 is an element used to position the input-side engaging portion 14 in a portion that is radially outward from the rotation center of the input component 3. In this example, the input flange 17 protrudes radially outward from the outer peripheral surface of the end on the axial side of the input shaft portion 15 throughout its entire circumference.

[0082] The input-side engaging portion 14 is designed such that, when a rotational torque is input to the input member 3, it engages with the input side of the engaging member 5 via the engaging portion 45, causing the engaging member 5 to rotate in the same direction as the input torque. In this example, the input-side engaging portion 14 protrudes from the side of the input flange portion 17 on the axially opposite side, from a portion that is radially outward from the center of rotation towards the axially opposite side.

[0083] The shape of the input-side engaging part 14 is not limited as long as it is configured to engage with the input side of the engaging part 45.

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

[0085] For example, viewed axially, the input-side engagement portion 14 can have a partially annular shape, a generally trapezoidal shape, or an end face 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 an end face shape similar to a generally 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 that is 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. The two side portions in the second direction are formed by partially cylindrical convex surfaces that are inclined in the direction outward in the first direction as it moves towards the two sides in the second direction. The radially outer surface 18 of the input-side engagement portion 14 is formed by partially cylindrical convex surfaces centered on the central axis O.

[0086] The number of input-side latching parts 14 is determined by the number of latching parts 5. When the latching parts 5 are composed of multiple latching parts 5, the input-side latching parts 14 are also composed of multiple input-side latching parts 14.

[0087] In this example, the engaging member 5 is composed of two engaging members 5. Therefore, the number of input-side engaging portions 14 matches the number of engaging members 5, and is composed of two input-side engaging portions 14. The two input-side engaging portions 14 are located at two radially opposite positions on the side of the input flange portion 17 on the axial side, and are radially separated from each other in the input member 3.

[0088] The input component 3 can be rotatably supported on the pressed component 2 or other housing elements mentioned above.

[0089] [Output Components]

[0090] The output component 4 has an output-side engaging portion 19 disposed radially inward of the input-side engaging portion 14, and is coaxially disposed with the pressed surface 7. That is, the output component 4 is also coaxially disposed with the input component 3.

[0091] 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 reduction gear 40. A toothed belt 66 is suspended between the drive pulley 41 and a driven pulley (not shown).

[0092] In addition to the output side engaging part 19, the output component 4 also has an output shaft part 20.

[0093] The output-side engagement portion 19 and the output shaft portion 20 are directly connected in the axial direction. Specifically, the output-side engagement portion 19 protrudes from the end face 23 on one axial side of the output shaft portion 20 toward the axial side.

[0094] The output-side engaging portion 19 has a portion that engages with the output side engaging portion 46 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 46 engages with the output side of the engaging member 5, causing the engaging member 5 to move towards the pressed surface 7.

[0095] The output-side engagement part 19 has a cam function.

[0096] The output-side engaging portion 19 has an output-side engaging surface 21 on its outer peripheral surface that engages with the output-side engaging portion 46 of the engaging member 5.

[0097] The output-side engaging portion 19 is configured such that, as the output component 4 or the engaging member 5 rotates, the output-side engaging surface 21 provided on its outer peripheral surface engages (contacts) with the output-side engaging portion 46.

[0098] The output-side engagement surface 21 is located radially inward from the input-side engagement portion 14 and radially outward from the rotation center axis O of the output component 4, and is positioned to engage with the output side of the engagement member 5 by the engagement portion 46. The distance from the rotation center axis O of the output component 4 to the output-side engagement surface 21 is not constant in the circumferential direction.

[0099] The number of output-side engaging surfaces 21 provided in the output-side engaging portion 19 is determined by the number of engaging members 5. When multiple engaging members 5 are constituted, the output-side engaging portion 19 is also configured to have multiple output-side engaging surfaces 21. In this example, the output-side engaging portion 19 is configured to have two output-side engaging surfaces 21 to match the number of engaging members 5. That is, the output-side engaging surfaces 21 are composed of two output-side engaging surfaces 21.

[0100] When the output-side engaging portion 19 is cut off 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 19 can be arbitrarily selected as long as the output-side engaging portion 19 has an output-side engaging surface 21 on its outer peripheral surface. For example, it can be a square, rectangle, parallelogram, trapezoid, or other quadrilateral, oval, or a shape similar to these quadrilaterals or ovals.

[0101] The shape of the output-side engaging surface 21 is not limited as long as it can engage with the output-side engaging portion 46 of the engaging member 5. For example, the output-side engaging surface 21 can be a flat surface parallel to the imaginary plane containing the central axis O of the output member 4, or it can be a partially cylindrical convex curved surface. In this example, the output-side engaging surface 21 is a flat surface parallel to the imaginary plane containing the central axis O of the output member 4.

[0102] In this example, when the output-side locking portion 19 is cut by an imaginary plane orthogonal to the rotation center axis O of the output component 4, as... Figure 6 As shown, it has a roughly rectangular cross-sectional shape. More specifically, the outer peripheral surface of the output-side engagement portion 19 is composed of two parallel output-side engagement surfaces 21 and two convex curved surfaces 22, each of which is partially cylindrical. The two output-side engagement surfaces 21 and the two convex curved surfaces 22 are evenly arranged at 180 degrees in the circumferential direction.

[0103] In this example, the output-side engaging portion 19 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 output-side engaging surfaces 21. Furthermore, the output-side engaging portion 19 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 output-side engaging surfaces 21. That is, the output-side engaging portion 19 has a shape that is twice symmetrical about the central axis O of the output member 4. The output-side engaging portion 19 is disposed radially inside the two input-side engaging portions 14 and is located between the output-side engaging portions 46 of the two engaging members 5.

[0104] The output shaft 20 is an element used to connect the output component 4 and the input part of the output side mechanism in a way that can transmit rotational torque.

[0105] The output shaft portion 20 has at least a portion of an end face 23 that is axially opposed to the engaging member 5 on one side.

[0106] The end face 23 on one axial side of the output shaft portion 20 is an element that connects to the end on the other axial side of the output side engaging portion 19, and is also an element that restricts the axial movement of the engaging member 5.

[0107] The end face 23 on one axial side of the output shaft portion 20 is configured as a flat surface orthogonal to the central axis of the output component 4 in order to restrict the axial movement of the engaging member 5.

[0108] The end face 23 on one axial side of the output shaft portion 20 and the output side engagement surface 21 are connected via the corner R portion 25.

[0109] The portion of the output shaft portion 20 on one axial side of its outer peripheral surface, whose circumferential phase coincides with that of the output-side engagement surface 21, has a groove 26 that extends linearly in a direction orthogonal to a second imaginary plane. This second imaginary plane is orthogonal to a first imaginary plane passing through the ends of the output-side engagement surface 21 in the circumferential direction and includes the central axis O of the output component 4. In this example, the output-side engagement surface 21 is composed of a flat surface; therefore, the aforementioned second imaginary plane is orthogonal to the output-side engagement surface 21 and corresponds to the imaginary plane passing through the central axis O of the output component 4.

[0110] The groove 26 is an element used to mitigate the stress acting on the corner R portion 25, which connects the end face 23 on one axial side of the output shaft portion 20 and the output side engagement surface 21.

[0111] The groove shape of the cross-section of the groove 26 on the aforementioned second imaginary plane is approximately U-shaped or approximately C-shaped. By making the groove shape of the cross-section of the groove 26 approximately U-shaped or approximately C-shaped, it is possible to eliminate stress concentration elements within the groove 26.

[0112] As long as excessive stress is not concentrated on the inner surface 27 of the groove 26 and the stress acting on the corner R 25 is mitigated, the specific structure of the inner surface 27 of the groove 26, the radial position of the bottom of the groove 26, the axial groove width of the opening 28 of the groove 26, and the axial position of the groove 26 can be arbitrarily set.

[0113] In the reverse input cut-off clutch 1, a groove 26 is formed on the outer peripheral surface of the output shaft portion 20. Therefore, when torque is transmitted through the output component 4, the stress acting on the corner R portion 25 is alleviated. Consequently, the radius of curvature R of the corner R portion 25 is reduced. 25 It can be set to a value that is sufficiently smaller than the radius of curvature of the angle R portion in the existing reverse input cut-off clutch. Specifically, the radius of curvature R of the angle R portion 25 is... 25 It can be set to 0.5mm or less, preferably 0.3mm or less.

[0114] That is, the radius of curvature R of the corner R 25 25 It can be set to be the same size as the minute gap 69 between the end face 23 on one axial side of the output shaft 20 and the end face 53 on the other axial side of the engaging member 5.

[0115] At least a portion of the end face 23 on one axial side of the output shaft portion 20 is axially opposed to the engaging member 5 and constitutes a limiting portion 24 to prevent the engaging member 5 from moving to the other axial side.

[0116] The outline shape of the end face 23 on one side of the axial direction of the output shaft portion 20 is not limited as long as at least a portion of it constitutes the limiting portion 24. For example, it can be configured as a circle, a square, or other polygons.

[0117] In this example, the output shaft portion 20 has a stepped cylindrical shape, so the end face 23 on one axial side of the output shaft portion 20 has a circular outline shape when viewed along the axial direction. In addition, the end face 23 on one axial side of the output shaft portion 20 is disposed radially inside the input side engagement portion 14 of the input component 3, so the end face 23 on one axial side of the output shaft portion 20 has a diameter slightly smaller than the diameter of the inscribed circle of the input side engagement portion 14.

[0118] In this example, the output-side engagement portion 19 has a generally rectangular end face shape with a dimension in the second direction larger than that in the first direction, and the dimension in the second direction has the same size as the diameter of the end face 23 on one axial side of the output shaft portion 20. Therefore, the portion of the end face 23 on one axial side of the output shaft portion 20 that deviates from the connection portion with the output-side engagement portion 19 in the first direction constitutes a limiting portion 24.

[0119] In this example, viewed axially, the limiting portion 24 has a generally bow shape. However, the shape of the limiting portion 24 is not limited as long as it can limit the axial movement of the engaging member 5 and does not obstruct the engagement of the input-side engaging portion 14 and the input-side engaged portion 45. From the perspective of effectively preventing the engaging member 5 from moving to the other side of the axial direction, the limiting portion 24 is preferably shaped to increase the area opposite to the engaging member 5.

[0120] The number of limiting portions 24 on one side of the axial end face 23 of the output shaft portion 20 is determined by the number of engaging members 5. When multiple engaging members 5 are involved, the limiting portions 24 are also configured to have multiple limiting portions 24. In this example, the output shaft portion 20 has two limiting portions 24 on one side of the axial end face 23, matching the number of engaging members 5. The limiting portions 24 are provided at the ends of both sides in a first direction on one side of the output shaft portion 20's axial end face 23. Therefore, the two limiting portions 24 are evenly arranged at 180 degrees in the circumferential direction.

[0121] In this example, a small axial gap 69 is provided between the end face 23 on one axial side of the output shaft portion 20 and the end face 53 on the other axial side of the engaging member 5. Specifically, a small axial gap 69 is provided between the limiting portion 24 in the end face 23 on one axial side of the output shaft portion 20 and the end face 53 on the other axial side of the engaging member 5. Therefore, the limiting portion 24 can be prevented from becoming a resistance when the engaging member 5 moves radially.

[0122] The size of the aforementioned micro-gap is not limited to this; for example, it can be set to 0.5 mm or less, preferably 0.3 mm or less. In this example, the size of the aforementioned micro-gap is set to 0.2 mm.

[0123] In this example, the radius of curvature R of corner R25 25 It is set to 0.2mm, the same size as the aforementioned tiny gap.

[0124] Regarding the groove 26, the specific structure of the inner surface 27, which prevents excessive stress concentration on the inner surface 27 and maximizes the stress mitigation effect on the corner R 25, the radial position of the bottom of the groove 26, the groove width of the opening 28 of the groove 26, and the axial position of the groove 26 vary based on the outer diameter of the output shaft 20, the radial distance from the central axis O of the output component 4 to the output side engagement surface 21, and the material of the output component 4, and can be determined through experiments, simulations, etc.

[0125] The specific structure of the groove 26 will be described in more detail below.

[0126] When the groove shape of the cross-section of the groove portion 26 is approximately U-shaped, the inner surface 27 of the groove portion 26 can be formed, for example, by a first inner surface 29 that is flat towards one axial direction, a second inner surface 30 that is flat towards the other axial direction, and a bottom surface 31 connecting the first inner surface 29 and the second inner surface 30. Compared to the case where the groove shape of the cross-section is approximately C-shaped, even when the radial distance from the central axis O of the output component 4 to the groove portion 26 is reduced, the axial groove width of the groove portion 26 can be kept from increasing. Therefore, by forming the groove portion 26, it is possible to prevent an excessive reduction in the rigidity and strength of the output component 4.

[0127] When the inner surface 27 of the groove 26 is composed of a first inner side surface 29, a second inner side surface 30, and a bottom surface 31, the bottom surface 31 can be composed of a partially cylindrical concave curved surface with a single radius of curvature. Such a groove 26 can be machined, for example, by cutting with a conventional tool such as an end mill, which is advantageous in terms of reducing machining costs.

[0128] Alternatively, if the inner surface 27 of the groove 26 is composed of a first inner surface 29, a second inner surface 30, and a bottom surface 31, the bottom surface 31 may be composed of a first curved surface 32 with a concave arc cross-sectional shape connected to the first inner surface 29, a second curved surface 33 with a concave arc cross-sectional shape connected to the second inner surface 30, and a bottom plane portion 34 that is substantially parallel to the output side engagement surface 21 and is axially disposed between the first curved surface 32 and the second curved surface 33.

[0129] Alternatively, if the inner surface 27 of the groove 26 is composed of a first inner surface 29, a second inner surface 30, and a bottom surface 31, the bottom surface 31 can be composed of a first curved surface 32 with a concave arc cross-sectional shape connected to the first inner surface 29 and a second curved surface 33 with a concave arc cross-sectional shape connected to the first curved surface 32 and the second inner surface 30, respectively.

[0130] When the bottom surface 31 has a first curved surface 32 and a second curved surface 33, the radius of curvature R of the first curved surface 32 can be made... 32 The radius of curvature R of the second curved face 33 33 They are not the same.

[0131] When torque is transmitted through the output component 4, the stress is more concentrated on the first curved surface 32 of the bottom surface 31, which is farther from the output side engagement surface 21, compared to the second curved surface 33 of the bottom surface 31 that is closer to the output side engagement surface 21. Therefore, when the radius of curvature R of the first curved surface 32 is... 32 The radius of curvature R of the second curved face 33 33 In the case that they are different, it is preferable to make the radius of curvature R of the first curved surface 32 32 The radius of curvature R of the second curved face 33 33 big.

[0132] Regarding the second curved surface 33 in the bottom surface 31, due to its radius of curvature R 33 The smaller the radius of curvature, the more difficult it is for stress to concentrate. Therefore, it is preferable to make the radius of curvature R of the second curved surface 33 smaller. 33 The radius of curvature R of the first curved face is 32. 32 Small. By reducing the radius of curvature R of the second curved face 33 in this way. 33 This effectively reduces the stress acting on the corner R portion 25. Furthermore, it allows for a reduction in the axial groove width of the groove portion 26, thus shortening the axial dimension of the output component 4. The radius of curvature R of the second curved surface portion 33... 33 The radius of curvature R of the corner R portion 25, which connects the end face 23 on one axial side of the output shaft portion 20 and the output side engagement surface 21, can be set. 25 The same degree of size.

[0133] When the groove shape of the cross section of the groove 26 is configured to be approximately C-shaped, the inner surface 27 of the groove 26 can, for example, be configured to be a concave surface in the shape of a partially cylindrical surface with a single radius of curvature.

[0134] In this example, the groove shape of the cross-section of the groove portion 26 is approximately U-shaped. The inner surface 27 of the groove portion 26 is composed of a first inner surface 29, which is flat and facing one side of the axial direction, a second inner surface 30, which is flat and facing the other side of the axial direction, and a bottom surface 31 connecting the first inner surface 29 and the second inner surface 30. In addition, the bottom surface 31 is composed of a partially cylindrical concave curved surface with a single radius of curvature. Furthermore, the first inner surface 29 and the second inner surface 30 are respectively arranged substantially parallel to the end face 23 on one side of the axial direction of the output shaft portion 20.

[0135] In this example with such a groove 26, compared to the case where the groove shape of the cross section is approximately C-shaped, even when the radial distance from the central axis O of the output member 4 to the groove 26 is reduced, the axial groove width of the groove 26 can be kept constant. Therefore, by forming the groove 26, it is possible to prevent the rigidity and strength of the output member 4 from decreasing as required. In addition, the groove 26 can be machined by cutting with a conventional tool such as an end mill, which is advantageous in terms of reducing machining costs.

[0136] The radial distance D from the central axis O of the output component 4 to the groove 26 26 This corresponds to the radial position at the bottom of groove 26. Such a radial distance D... 26 For example, the radial distance D from the central axis O of the output component 4 to the output-side engagement surface 21 can be used. 21 It is determined based on the benchmark. Figure 9 The radial distance D is determined through simulation. 26 With radial distance D 21 The ratio (D) 26 / D 21 A graph showing the relationship between the magnitude of the maximum moment at which no plastic deformation occurs at angle R 25. (As per...) Figure 9 It can be understood that the aforementioned radial distance D 26 Preferably set to the radial distance D mentioned above. 21 The same magnitude. Specifically, the aforementioned radial distance D 26 It can be set to the aforementioned radial distance D 21 The radial distance D is preferably more than 0.7 times and less than 1.4 times the aforementioned radial distance. 21 The size is more than 0.85 times but less than 1.25 times.

[0137] In this example, the radial distance D from the central axis O of the output component 4 to the slot 26 is... 26The radial distance D from the central axis O of the output component 4 to the output-side engagement surface 21 is set as follows. 21 Roughly the same size. More specifically, the radial distance D 26 Set to pass Figure 9 The simulation shown yielded the optimal value.

[0138] The axial groove width W of the opening 28 of the groove 26 26 The stress on the inner surface 27 of the groove 26 varies depending on the radius of curvature of the curved surface of the bottom surface 31 that constitutes the groove 26. The smaller the value, the greater the stress on the inner surface 27 of the groove 26. Conversely, the larger the value, the smaller the stress on the inner surface 27 of the groove 26.

[0139] In this example, the bottom surface 31 is composed of a partially cylindrical concave curved surface with a single radius of curvature, therefore the axial groove width W of the opening 28 of the groove 26 is... 26 The size is set to twice the radius of curvature of the bottom surface 31.

[0140] The axial position of the slot 26 can be expressed as the axial dimension L from the end face 23 on one side of the output shaft 20 to the opening 28 of the slot 26. 26 The aforementioned axial dimension L 26 The smaller the value, the greater the stress mitigation effect on the corner R25. Conversely, the aforementioned axial dimension L... 26 The larger the value, the smaller the stress mitigation effect on the corner R25.

[0141] In this example, the axial dimension L from the end face 23 on one side of the output shaft portion 20 to the opening 28 of the groove portion 26 is... 26 The size is set to be greater than the axial groove width W of the opening 28 of the groove 26. 26 Smallest value. Axial dimension L 26 It can be set to the slot width W 26 It is less than 1 / 2, preferably less than 1 / 3. In this example, the axial dimension L 26 Set as slot width W 26 It is approximately 1 / 3 the size.

[0142] The number of slots 26 provided in the output shaft portion 20 is determined by the number of output side engagement surfaces 21 provided in the output side engagement portion 19. When the output side engagement surfaces 21 are composed of multiple output side engagement surfaces 21, the slots 26 are also configured to have multiple slots 26. In this example, the number of output shaft portions 20 and output side engagement surfaces 21 are matched to form two slots 26. The slots 26 are provided at two locations on opposite sides of the outer peripheral surface of the output shaft portion 20 in the diameter direction. The two slots 26 are evenly arranged at 180 degrees in the circumferential direction.

[0143] The output shaft portion 20 has a groove 26 formed on one axial side of its outer peripheral surface. Therefore, the portion of the output shaft portion 20 adjacent to the axial side of the groove 26 at its axial end has a radially outward width and an axial dimension L. 26 The same convex edge 35. The end face of one axial side of the convex edge 35 is formed by the limiting part 24, and the side surface of the other axial side of the convex edge 35 is formed by the inner surface 27 of the groove 26. Specifically, it is formed by the axial side portion of the bottom surface 31 and the second inner surface 30.

[0144] In the reverse input cut-off clutch 1 disclosed herein, the portion of the output shaft portion 20 on one axial side of its outer peripheral surface, where its circumferential phase coincides with the output-side engagement surface 21, has a groove 26 that extends linearly in a direction orthogonal to a second imaginary plane. This second imaginary plane is orthogonal to a first imaginary plane passing through the ends of the output-side engagement surface 21 on both sides in the circumferential direction and includes the central axis O of the output component 4. Therefore, when torque is transmitted using the output component 4, the stress acting on the corner R portion 25 can be mitigated. Consequently, the radius of curvature R of the corner R portion 25 can be reduced. 25 Therefore, interference between the corner R portion 25 and the engaging member 5 can be prevented. Therefore, the movement of the engaging member 5 to the other axial side can be directly restricted by the end face 23 on one axial side of the output shaft portion 20 without the use of a shim.

[0145] In addition, the groove shape of the cross section of the groove 26 is approximately U-shaped or approximately C-shaped, so that when the torque is transmitted using the output component 4, excessive stress can be prevented from concentrating on the inner surface 27 of the groove 26.

[0146] Therefore, in the reverse input cut-off clutch 1 of this disclosure, the number of components can be reduced and stress concentration in the output component 4 can be prevented.

[0147] In this example, the output shaft portion 20, 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 the 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.

[0148] In this example, the large-diameter portion 36 of the output shaft portion 20 is supported to be rotatable relative to the pressed member 2. Specifically, the large-diameter portion 36 of the output shaft portion 20 is supported by a radial rolling bearing 42a to be rotatable relative to the pressed member 2. The radial rolling bearing 42a 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.

[0149] In this example, the output shaft portion 20 has a mounting shaft portion 43 on the axial side adjacent to the output side engaging portion 19.

[0150] The mounting shaft portion 43 is an element for mounting the limiting member 54, which is used to prevent the engaging member 5 from moving axially to one side.

[0151] The mounting shaft 43 protrudes from the end face 67 on one axial side of the output side engagement portion 19 toward the axial side.

[0152] The shape of the mounting shaft portion 43 is not limited as long as it is configured as a mounting limiting member 54. The shape of the mounting shaft portion 43 can be appropriately changed depending on the type of limiting member 54 used. Specifically, the mounting shaft portion 43 can be any shape, such as cylindrical, frustum conical, oblong cylindrical, elliptical cylindrical, square prism, or other prism shapes.

[0153] In this example, the limiting member 54 is composed of a notched annular stop ring. Therefore, the mounting shaft portion 43 has a cylindrical shape for locking the stop ring that serves as the limiting member 54. The mounting shaft portion 43 has an outer diameter that is the same size in a first direction as the end face 67 on one axial side of the output-side engaging portion 19. In addition, the mounting shaft portion 43 has a locking groove 68 at the axial middle portion of its outer peripheral surface for locking the stop ring that serves as the limiting member 54.

[0154] In this example, the mounting shaft 43 is provided at one end of the output component 4 on the axial side. However, the output component 4 may also have, for example, a shaft portion on the axial side of the mounting shaft 43, which is used to insert into the inside of the input shaft portion 15 to improve the coaxiality between the output component 4 and the input component 3.

[0155] [Card assembly]

[0156] The engaging member 5 has a pressing surface 44 opposite to the pressing surface 7, an input-side engaging portion 45 that can engage with the input-side engaging portion 14, and an output-side engaging portion 46 that can engage with the output-side engaging portion 19, and is configured to be movable in a first direction relative to the pressing surface 7 in a near-far direction.

[0157] 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 45, and by engaging the output-side engaged part 46 with the output-side engaging part 19, 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 44 against the pressed surface 7, based on the engagement of the output-side engaging part 19 and the output-side engaged part 46, so that the pressing surface 44 and the pressed surface 7 are engaged by friction.

[0158] As long as the snap-fit ​​component 5 has this structure, it can be composed of two snap-fit ​​components 5 or more snap-fit ​​components 5.

[0159] 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.

[0160] The shape of the locking component 5 can be arbitrarily selected as long as it has a pressing surface 44, an input-side locking portion 45 and an output-side locking portion 46 and can perform the above-mentioned functions. Existing locking component shapes can also be widely adopted.

[0161] 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. The structure of each engaging member 5 will be described below.

[0162] The pressing surface 44 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 44 can be arbitrarily selected as long as it can frictionally engage with the pressed surface 7. The pressing surface 44 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 44 or multiple pressing surfaces 44 can be provided for one engaging member 5. The radius of curvature of the pressing surface 44 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.

[0163] In this example, the pressing surface 44 is composed of two pressing surfaces 44 located at two circumferentially separated positions on the radially outer surface of the engaging member 5. Each pressing surface 44 is composed of a partially cylindrical convex surface having a radius of curvature smaller than that of the pressed surface 7.

[0164] The portion of the outer radial surface of the engaging member 5 that is circumferentially offset from the two pressing surfaces 44, when viewed from the axial direction, exists radially inward than the circumcircle centered on the rotation center O of the input member 3 and in contact with the two pressing surfaces 44. That is, when the two pressing surfaces 44 are in contact with the pressed surface 7, the portion that is circumferentially offset from the two pressing surfaces 44 does not contact the pressed surface 7.

[0165] The pressing surface 44 preferably has a surface characteristic that has a larger coefficient of friction relative to the pressed surface 7 compared to other parts of the engaging member 5. In addition, the pressing surface 44 can be integrally formed with other parts of the engaging member 5, or it can be formed by the surface of a friction material that is fixed to other parts of the engaging member 5 by adhesive or the like.

[0166] The input-side engaging portion 45 is an element that engages with the input-side engaging portion 14 as the input component 3 rotates and receives the rotational torque input from the input component 3. The shape of the input-side engaging portion 45 is not limited as long as it is configured to engage with the input-side engaging portion 14.

[0167] In this example, the input-side engaging portion 45 is provided in the radial middle portion of the central portion of the engaging member 5 in the width direction. More specifically, the input-side engaging portion 45 is constituted by a through hole that axially passes through the radial middle portion of the central portion of the engaging member 5 in the width direction.

[0168] The input-side engaging portion 45 is sized to allow for the loose insertion of 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 45, gaps exist between the inner surfaces of the input-side engaging portion 14 and the input-side engaging portion 45 in both the width and radial directions of the engaging member 5. Thus, the input-side engaging portion 14 can be displaced relative to the input-side engaging portion 45 in the rotational direction of the input member 3, and the input-side engaging portion 45 can be displaced radially relative to the input-side engaging portion 14.

[0169] In this example, the inner surface of the input-side engaging portion 45 has a radially inner surface 47 facing radially outward, which is composed of a flat surface orthogonal to the first direction. Furthermore, the inner surface of the input-side engaging portion 45 has a radially outer surface 48 facing radially inward, which is composed of a curved surface having a generally arcuate profile when viewed from the axial direction, or a composite surface having a generally V-shaped profile. The circumferential side surface 49 connecting the ends of the radially inner surface 47 in the second direction and the ends of the radially outer surface 48 in the second direction is composed of a partially cylindrical concave curved surface.

[0170] The output-side engaging portion 46 is an element that engages with the output-side engaging portion 19 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 46 is not limited as long as it is configured to engage with the output-side engaging portion 19. In this example, the output-side engaging portion 46 is located at the center of the radially inner surface of the engaging member 5 in the width direction.

[0171] In this example, the engaging member 5 has a flat surface 50 on its radially inner side that is orthogonal to the radial direction of the engaging member 5, and two protrusions 51 protruding radially inward at two locations in the width direction of the flat surface 50. Furthermore, the output-side engaging portion 46 is formed by the portion of the flat surface 50 that exists in the width direction between the two protrusions 51. In addition, in this example, the width dimension of the output-side engaging portion 46, i.e., the distance between the two protrusions 51, is larger than the width dimension of the output-side engaging surface 21 of the output-side engaging portion 19.

[0172] In the reverse input cut-off clutch 1 of this example, with the pressing surfaces 44 of the two engaging members 5 facing opposite sides radially and the flat surfaces 50 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-side engaging portions 14 of the input member 3, located on one axial side, are axially inserted into the respective input-side engaging portions 45 of the two engaging members 5, and the output-side engaging portions 19 of the output member 4, located on the other axial side, are axially inserted between the output-side engaging portions 46 of the two engaging members 5. That is, the two engaging members 5 are configured to clamp the output-side engaging portions 19 from the radial outside via their respective output-side engaging portions 46.

[0173] 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 44 and the portions between the front ends of the two combinations of the protrusions 51 formed by the two protrusions 51 of the two engaging members being opposed to each other exists.

[0174] In this example, the engaging member 5 has a constant axial dimension throughout its radial direction. The end face 52 on one axial side and the end face 53 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 flat surface 50 constituting the radial inner surface of the engaging member 5 and the end face 52 on one axial side and the end face 53 on the other axial side are connected at right angles.

[0175] [Limiting components]

[0176] In this example, the reverse input cut-off clutch 1 has a limiting component 54 as an arbitrary constituent element.

[0177] The limiting component 54 is an element that restricts the movement of the engaging component 5 relative to the output component 4 in one direction in the axial direction.

[0178] The limiting member 54 is mounted on the mounting shaft 43 of the output member 4. The limiting member 54 can be configured to directly restrict the movement of the engaging member 5 to one axial direction by being directly opposite the engaging member 5 in the axial direction, or it can be configured to restrict the movement of the engaging member 5 to one axial direction by sandwiching a gasket 55 between itself and the engaging member 5.

[0179] In this example, the limiting member 54 is configured to sandwich a pad 55 between itself and the engaging member 5, thereby limiting the movement of the engaging member 5 to one axial direction via the pad 55.

[0180] In this example, the limiting member 54 is composed of a notched annular stop ring and is locked in a locking groove 68 formed on the outer peripheral surface of the mounting shaft portion 43.

[0181] 〔liner〕

[0182] In this example, the reverse input cut-off clutch 1 has a gasket 55 disposed between the end face 52 on one axial side of the engaging member 5 and the limiting member 54 as an arbitrary constituent element.

[0183] The pad 55 is an element used to be disposed between the end face 52 on one axial side of the engaging member 5 and the limiting member 54, so that the axial position of the pressing surface 44 of the engaging member 5 is consistent with the axial position of the pressing surface 7 of the pressed member 2.

[0184] The shape, size and material of the pad 55 are not limited as long as it is configured to be disposed between the end face 52 on one axial side of the engaging member 5 and the limiting member 54, and the axial position of the pressing surface 44 of the engaging member 5 is consistent with the axial position of the pressing surface 7 of the pressed member 2.

[0185] In this example, the gasket 55 is disposed around the output-side engagement portion 19 and between the end face 52 of each of the two engagement members 5 on one axial side and the limiting member 54.

[0186] The gasket 55 is made of synthetic resin, rubber, metal materials, etc.

[0187] In this example, the gasket 55 is configured as a flat plate and has an end face shape that is approximately rectangular or approximately oblong when viewed along the axial direction. In this example, the end face 56 on one side of the axial direction and the end face 57 on the other side of the axial direction of the gasket 55 are arranged parallel to each other and are each configured as a flat surface.

[0188] In this example, the gasket 55 has a through hole 58 through which the output-side engagement portion 19 is inserted. The through hole 58 extends axially through the center of the gasket 55, has an opening shape that is generally rectangular or generally oval when viewed axially, and has a size that allows the output-side engagement portion 19 to be inserted without wobbling.

[0189] [Force-applying component]

[0190] The reverse input cut-off clutch 1 in this example also has a force-applying component 59 as an arbitrary constituent element.

[0191] The force-applying component 59 elastically applies force to the engaging member 5 in a direction closer to the pressed surface 7. The force-applying component 59 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 59 is not particularly limited and is appropriately determined according to the number of engaging members 5.

[0192] In this example, the force-applying component 59 consists of two force-applying components 59 positioned at two locations in the width direction between the radially inner sides of the two engaging members 5, and each force-applying component 59 is composed of a compression coil spring. A protrusion 51 is inserted into the inner side of the ends on both sides in the elongation direction of each force-applying component 59. This prevents the force-applying component 59 from dislodging from the portion between the two engaging members 5.

[0193] The two force-applying components 59 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 44 of the two engaging members 5 are in contact with the pressed surface 7.

[0194] [Supporting Components]

[0195] The reverse input cut-off clutch 1 in this example also has a support member 60 as an arbitrary component.

[0196] The support member 60 is an element used to rotatably support the axial end (small diameter part 38) of the output shaft 20 on the other side.

[0197] The support member 60 includes a bearing retainer 61 with a cylindrical shape, a partially cylindrical portion 62 extending circumferentially from one end of the bearing retainer 61 toward one side of the axial direction, and an outwardly extending flange portion 63 extending radially outward from one end of the partially cylindrical portion 62.

[0198] The support member 60 is supported and fixed to the housing element 8 by threading a bolt 65, which is inserted into the through hole 64 provided in the outward flange portion 63, into the threaded hole 13 provided in the housing element 8.

[0199] The axial end (small diameter portion 38) of the output shaft portion 20 is rotatably supported on the support member 60 via a radial rolling bearing 42b held in the bearing retainer portion 61.

[0200] Furthermore, in the illustrated example, the radial rolling bearings 42a and 42b that rotatably support the output shaft 20 are respectively constructed from ball bearings using balls as rolling elements. However, the radial rolling bearings supporting the output shaft 20 can also be constructed from tapered roller bearings using tapered rollers as rolling elements or cylindrical roller bearings using cylindrical rollers. In addition, different types of bearings can be used as radial rolling bearings 42a and 42b.

[0201] <Instructions for Reverse Input Clutch Disengagement>

[0202] use Figure 7 as well as Figure 8 The operation of the reverse input disengagement clutch 1 in this example will be explained. Furthermore, Figure 7 and Figure 8 The force-applying component 59 is omitted, and the radial clearance between the input component 3 and the output component 4 and the two engaging components 5 is exaggerated.

[0203] 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 7 As shown, the input-side engaging portion 14 is located inside the input-side engaging portion 45 in the rotational direction of the input component 3 (in... Figure 7 In the example, it rotates counterclockwise.

[0204] This reduces the gap between the radial inner surface 16 of the input-side engaging portion 14 and the radial inner surface 47 of the input-side engaged portion 45, causing the radial inner surface 16 of the input-side engaging portion 14 to come into contact with the radial inner surface 47 of the input-side engaged portion 45.

[0205] 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 47 of the input-side engaging portion 45 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 19 of the output component 4 is clamped from both radial sides by the output-side engaging portions 46 of the two engaging members 5.

[0206] In this way, while rotating the output component 4 so that the output side engaging surface 21 of the output side engaging portion 19 is parallel to the output side engaged portion 46, the output side engaging portion 19 and the output side engaged portion 46 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.

[0207] 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 8 As shown, the output-side engaging portion 19 is located on the output side of the two engaging members 5, and the engaging portion 46 is located on the inner side of each other along the rotation direction of the output member 4. Figure 8 (In the example, it is rotated clockwise). Through the output side engagement surface 21 in the outer peripheral surface of the output side engagement part 19, the output side engagement part 46 is pressed radially outward, and the two engagement parts 5 move towards the pressed surface 7.

[0208] 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 44 of the two engaging parts 5 contact the pressed surfaces 7 and engage with each other friably relative to the pressed surfaces 7.

[0209] 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.

[0210] In order to completely cut off the rotational torque input to the output component 4 in the opposite direction and prevent it from being transmitted to the input component 3, the locking member 5 protrudes (clamps) between the output side locking part 19 and the pressed component 2 in such a way that the pressing surface 44 of the locking member 5 does not slide (relatively rotates) relative to the pressed surface 7, thereby locking the output component 4.

[0211] 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 output side locking part 19 and the pressed component 2, thereby partially locking the output component 4.

[0212] 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 44 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 47 of the input-side engaged part 45.

[0213] 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 44 contacts the pressed surface 7, the surface pressure acting on the contact part between the pressing surface 44 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.

[0214] In the reverse input cut-off clutch 1 of this disclosure, a groove 26 is formed on the outer peripheral surface of the output shaft portion 20, thereby mitigating the stress acting on the corner R portion 25, and thus reducing the radius of curvature R of the corner R portion 25. 25 Therefore, interference between the corner R portion 25 and the engaging member 5 can be prevented. Thus, the engaging member 5 can be directly restricted from moving to the other axial side via the end face 23 on one axial side of the output shaft portion 20 without using a gasket. Specifically, the moving of the engaging member 5 to the other axial side can be directly restricted via the limiting portion 24 in the end face 23 on one axial side of the output shaft portion 20.

[0215] Furthermore, in the reverse input cut-off clutch 1 of this disclosure, the groove shape of the cross section of the groove 26 is configured as approximately U-shaped or approximately C-shaped. Therefore, when the torque is transmitted using the output member 4, excessive stress can be prevented from concentrating on the inner surface 27 of the groove 26.

[0216] [Second Example]

[0217] use Figure 10 and Figure 11 A second example of an embodiment of this disclosure will be described.

[0218] In this example, only the structure of the inner surface 27 of the groove 26 differs from that of the first example. The structure of the other parts is the same as that of the reverse input cut-off clutch 1 in the first example.

[0219] In this example, the inner surface 27 of the groove 26 is composed of a first inner side surface 29, a second inner side surface 30, and a bottom surface 31. The bottom surface 31 is composed of a first curved surface 32 with a concave arc cross-sectional shape connected to the first inner side surface 29, a second curved surface 33 with a concave arc cross-sectional shape connected to the second inner side surface 30, and a bottom plane portion 34 that is substantially parallel to the output side engagement surface 21 and is axially disposed between the first curved surface 32 and the second curved surface 33.

[0220] Additionally, in this example, the radius of curvature R of the first curved surface 32 32 The radius of curvature R of the second curved face 33 33 Dissimilar (R) 32 ≠R 33 Specifically, the radius of curvature R of the second curved surface 33 33 The radius of curvature R of the first curved face is 32. 32 Small (R) 32 >R 33 Specifically, in this example, the radius of curvature R of the second curved surface 33 is... 33 Having a radius of curvature R of 25° with angle R 25 Roughly the same size (R) 32 >R 33≈R 25 ).

[0221] In this example, the radius of curvature R of the first curved surface 32 forming the bottom surface 31 in the inner surface 27 of the groove 26 is... 32 The radius of curvature R of the second curved face 33 33 The curvature radius R of the first curved surface 32, which is different from each other and where stress concentration is easily concentrated, is used. 32 The radius of curvature R of the second curved surface 33, which is difficult to concentrate specific stress 33 Large. Therefore, it is possible to prevent excessive stress concentration on the first curved surface 32. In particular, in this example, the radius of curvature R of the second curved surface 33 is made large. 33 The radius of curvature R of the angle R portion is sufficiently reduced to 25. 25 With approximately the same size, the stress acting on the corner R25 can be sufficiently reduced. Figure 11 The radius of curvature R of the second curved surface 33 was determined by simulation. 33 The radius of curvature R of the angle R25 25 The ratio (R) 33 / R 25 A graph showing the relationship between the magnitude of the maximum shear stress acting on the 25° angle (R) and the maximum shear stress acting on the 25° angle. (Based on...) Figure 11 It can be understood that by reducing the radius of curvature R 33 This reduces the maximum shear stress acting on the corner R 25. Therefore, by increasing the radius of curvature R of the second curved surface 33... 33 The radius of curvature R of the angle R portion is sufficiently reduced to 25. 25 With roughly the same size, the stress acting on the corner R25 can be significantly reduced.

[0222] The structure and function of the other parts in the second example are the same as those in the first example.

[0223] [Third Case]

[0224] use Figure 12 A third example of an embodiment of this disclosure will be described.

[0225] In this example, only the groove shape of the cross-section of the groove 26 differs from the construction of the first example. The construction of the other parts is the same as that of the reverse input cut-off clutch 1 in the first example.

[0226] In this example, the groove shape of the cross-section of the groove 26 is roughly C-shaped.

[0227] Therefore, the inner surface 27 of the groove 26 is composed only of a partially cylindrical concave surface with a single radius of curvature.

[0228] The size of the central angle θ of the groove shape of the cross-section of the groove 26 is not limited as long as it can mitigate the stress acting on the corner R 25 and prevent excessive stress concentration on the inner surface 27 of the groove 26. In this example, the central angle θ of the groove shape of the cross-section of the groove 26 is set to a value greater than 180 degrees. However, the central angle θ of the groove shape of the cross-section of the groove 26 can be either smaller than 180 degrees or 180 degrees.

[0229] In this example, the groove shape of the cross-section of the groove 26 is approximately C-shaped, and the inner surface 27 of the groove 26 is composed only of a partially cylindrical concave surface with a single radius of curvature. Therefore, the groove 26 can be machined by cutting with a drilling tool, such as a drill bit. This is advantageous in terms of reducing machining costs.

[0230] The structure and function of the other parts in the third example are the same as those in the first example.

[0231]

Example

[0232] The simulation conducted to confirm the effect of the reverse input cut-off clutch of this disclosure will be explained.

[0233] In this simulation, a set of conditions was prepared. Figure 13 (A)~ Figure 13 (E) shows the cross-sectional shape of five output components 4 (Examples 1, 2, 3, Comparative Example 1, and Comparative Example 2). Each of the five output components 4 has an output-side engaging portion 19 on one side of the axial direction and an output shaft portion 20 on the other side of the axial direction. The output-side engaging portion 19 has two output-side engaging surfaces 21 arranged parallel to each other.

[0234] Furthermore, for each of these output components 4, with the end of the output shaft portion 20 fixed on the other side of the axial direction, a torque of 7 Nm is applied to the end of the output side engagement portion 19 on one side of the axial direction around the central axis O of the output component 4, and the magnitude of the maximum shear stress acting on the corner R portion 25 that connects the output side engagement surface 21 and the end face 23 on one side of the axial direction of the output shaft portion 20 is determined.

[0235] The specifications of each output component 4 (Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2) are as follows.

[0236] (Example 1)

[0237] Figure 13 (A) indicates the cross-sectional shape of the output component 4 in Embodiment 1.

[0238] The outer diameter d of the output shaft 20 20 17mm

[0239] The radial distance D from the central axis O of the output component 4 to the output-side engagement surface 21 21 2.5mm

[0240] The radius of curvature R of the angle R25 25 0.2mm

[0241] The groove shape of the cross-section of groove 26 is approximately U-shaped.

[0242] The shape of the bottom surface 31 of the groove 26: a partially cylindrical concave curved surface with a single radius of curvature. The radius of curvature of the bottom surface 31 is 2.5 mm.

[0243] The groove width W of the opening 28 of the groove 26 26 5mm

[0244] The radial distance D from the central axis O of the output component 4 to the groove 26 26 2.5mm

[0245] The axial dimension L from the end face 23 on one axial side of the output shaft 20 to the opening 28 of the groove 26 26 1.5mm

[0246] The axial dimension from the end (fixed part) on the other side of the output shaft 20 to the end face 23 on one side of the axial direction is 39.54 mm.

[0247] The axial dimension from the axial end (the part where torque is applied) of the output-side engaging portion 19 to the axial end face 23 of the output shaft portion 20 is 25.5 mm.

[0248] (Example 2)

[0249] Figure 13 (B) shows the cross-sectional shape of the output component 4 in Embodiment 2. This excludes the radial distance D from the central axis O of the output component 4 to the groove 26. 26 Except for the 2.775mm, it is the same as in Example 1.

[0250] (Example 3)

[0251] Figure 13 (C) indicates the cross-sectional shape of the output component 4 in Embodiment 3. The bottom surface 31 of the groove 26 is composed of a first curved surface 32, a second curved surface 33, and a bottom flat surface 34, wherein the radius of curvature R of the first curved surface 32 is... 32 It is 2.5mm, and the radius of curvature R of the second curved surface 33 is... 33 The value is 0.2 mm, and otherwise it is the same as in Example 2.

[0252] (Comparative Example 1)

[0253] Figure 13 (D) indicates the cross-sectional shape of the output component 4 of Comparative Example 1. Except that the output shaft portion 20 does not have a groove 26 on its outer peripheral surface, it is the same as that of Example 1.

[0254] (Comparative Example 2)

[0255] Figure 13 (E) indicates the cross-sectional shape of the output component 4 in Comparative Example 2. Except that the outer peripheral surface of the output shaft portion 20 does not have a groove 26 and the radius of curvature R of the corner R portion 25 is... 25 Except for the 1.8mm diameter, it is the same as in Example 1.

[0256] Table 1 shows the magnitude (MPa) of the maximum shear stress acting on the corner R 25 in each output component 4 (Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2) and the reduction rate (%) of the maximum shear stress based on Comparative Example 1.

[0257] Table 1

[0258]

[0259] [Research]

[0260] We studied the simulation results while referring to Table 1.

[0261] Comparing Comparative Example 1 and Comparative Example 2, where the outer peripheral surface of the output shaft portion 20 does not have a groove portion 26, it can be confirmed that by reducing the radius of curvature R of the angle R portion 25... 25 The maximum shear stress acting on the corner R25 increases.

[0262] Comparing Comparative Example 1 and Example 1, it can be confirmed that by forming a groove 26 in the circumferential direction phase of one side of the outer peripheral surface of the output shaft portion 20 that coincides with the output side engagement surface 21, and making the groove shape of the cross section of the groove 26 approximately U-shaped, the maximum shear stress acting on the corner R portion 25 is reduced.

[0263] Comparing Embodiment 1 and Embodiment 2, it can be confirmed that, compared to the radial distance D from the central axis O of the output component 4 to the groove 26, 26 The radial distance D from the central axis O of the output component 4 to the output side engagement surface 21 21 Under the same circumstances, the radial distance D 26 The radial distance D from the central axis O of the output component 4 to the output-side engagement surface 21 21 The maximum shear stress acting on the corner R25 is reduced by 1.1 times.

[0264] Comparing Embodiment 2 and Embodiment 3, it can be confirmed that by forming the bottom surface 31 of the groove 26 with a first curved surface 32, a second curved surface 33, and a bottom flat surface 34, and setting the radius of curvature R of the second curved surface 33 to be... 33 The radius of curvature R of the first curved face is 32. 32 The smaller size results in a reduction in the maximum shear stress acting on the corner R 25 compared to the case where the bottom surface 31 is composed of a concave surface with a single radius of curvature.

[0265] In various embodiments, a structure has been described that uses a limiting member 54 consisting of a stop ring and a liner 55 to prevent the engaging member 5 from moving axially to one side. However, the reverse input cut-off clutch of this disclosure can also be implemented in combination with a structure that directly restricts the movement of the engaging member to one side axially by the limiting member or a structure that restricts the movement of the engaging member to one side axially by other members.

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 the input-side mechanism on one side in the axial direction, 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 output-side engaging portion has an output-side engaging surface on its outer peripheral surface that engages with the aforementioned output-side engaging portion. The aforementioned output component has an output shaft portion, which has at least a portion of an end face on one axial side that is axially opposed to the aforementioned engaging member. The end face of the aforementioned output shaft on one axial side and the aforementioned output side engagement surface are connected via a corner R portion. The portion of the output shaft portion on one axial side of its outer peripheral surface, whose circumferential phase coincides with the output side engagement surface, has a groove that extends linearly in a direction orthogonal to a second imaginary plane. This second imaginary plane is orthogonal to a first imaginary plane passing through the ends of the output side engagement surface on both sides in the circumferential direction and includes the central axis of the output component. The groove shape of the cross section of the aforementioned groove on the aforementioned second imaginary plane is approximately U-shaped or approximately C-shaped.

2. The reverse input cut-off clutch according to claim 1, characterized in that, The groove shape of the cross-section of the aforementioned groove is approximately U-shaped. The inner surface of the groove is composed of a first inner surface that is flat and facing one side of the axial direction, a second inner surface that is flat and facing the other side of the axial direction, and a bottom surface that connects the first inner surface and the second inner surface.

3. The reverse input cut-off clutch according to claim 2, characterized in that, The aforementioned bottom surface is composed of a partially cylindrical concave surface with a single radius of curvature.

4. The reverse input cut-off clutch according to claim 2, characterized in that, The bottom surface has: a first curved surface connected to the first inner surface and having a concave arc cross-sectional shape; and a second curved surface connected to the second inner surface and having a concave arc cross-sectional shape.

5. The reverse input cut-off clutch according to claim 4, characterized in that, The bottom surface has a bottom plane portion that is arranged substantially parallel to the output side engagement surface in the axial direction between the first curved surface and the second curved surface.

6. The reverse input cut-off clutch according to claim 5, characterized in that, The radius of curvature of the first curved surface is larger than that of the second curved surface.

7. The reverse input cut-off clutch according to claim 6, characterized in that, The radius of curvature of the second curved surface is of the same magnitude as the radius of curvature of the angle R portion.

8. The reverse input cut-off clutch according to any one of claims 1 to 7, characterized in that, The radial distance from the central axis of the output component to the groove is 0.85 times or more and 1.25 times or less the radial distance from the central axis of the output component to the output-side engagement surface.

9. The reverse input cut-off clutch according to any one of claims 1 to 8, characterized in that, The axial groove width of the opening of the aforementioned groove is larger than the axial dimension from the end face of the aforementioned output shaft on one side of the aforementioned axial direction to the opening of the aforementioned groove.

10. The reverse input cut-off clutch according to any one of claims 1 to 9, characterized in that, The aforementioned output-side engagement surface is composed of two such output-side engagement surfaces arranged in parallel with each other. The aforementioned groove is composed of two grooves arranged on opposite sides of the outer peripheral surface of the aforementioned output shaft in the diametrical direction.

11. The reverse input cut-off clutch according to any one of claims 1 to 10, characterized in that, A small axial gap is provided between the end face of the output shaft on one axial side and the end face of the engaging member on the other axial side.

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