Clutch device

Abstract

The invention provides a clutch device which can be assembled between a driving source and a driven body and can prevent transmission of impact torque from the driven body to the driving source. A clutch device (1) is provided with a first rotating member (2), a second rotating member (3), a third rotating member (4), an engagement member (5), and a flywheel (6) fixed to the first rotating member (2). When torque is input to the second rotating member (3), torque is transmitted between the second rotating member (3) and the third rotating member (4) while the first rotating member (2), the flywheel (6), the second rotating member (3), the third rotating member (4), and the engagement member (5) are in a stable rotating state in which the first rotating member (2), the flywheel (6), the second rotating member (3), the third rotating member (4), and the engagement member (5) rotate integrally. When the torque acting on the third rotating member (4) increases sharply in the steady rotating state, the flywheel (6) is brought into a torque transmission restriction state in which the torque transmitted between the second rotating member (3) and the third rotating member (4) is reduced or lost on the basis of the inertia force acting on the flywheel (6).

Description

TECHNICAL FIELD

[0001] The present application relates to a clutch device that is assembled between a driving source and a driven body. BACKGROUND

[0002] As described in, for example, Japanese Patent Application Publication No. 9-226394, a drive device for an electric automobile is provided with an electric motor as a driving source, a gear type reduction mechanism, and a differential gear. When the electric motor is energized to rotate a output shaft of the electric motor, the rotational torque of the output shaft is transmitted to the differential gear after being increased by the reduction mechanism, and is distributed to left and right drive wheels as driven bodies by the differential gear.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 9-226394 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] The drive device for an electric automobile described in Japanese Patent Application Publication No. 9-226394 leaves room for improvement in the following respects.

[0008] In the drive device for an electric automobile described above, in a case where the torque inputted in reverse from the driven wheels is greater than the torque transmitted from the electric motor to the drive wheels via the differential gear and the reduction mechanism, the torque inputted in reverse from the drive wheels is transmitted to the electric motor via the differential gear and the reduction mechanism.

[0009] For example, when the electric automobile is running on a rough road, the drive wheels are lifted from the road surface and come into contact with the road surface again, and an impact torque is inputted in reverse from the drive wheels. If the input of such an impact torque in reverse is to be permitted, the differential gear, the reduction mechanism, and the electric motor become large in size or heavy.

[0010] An object of the present disclosure is to provide a clutch device that can be assembled between a driving source and a driven body, and that prevents the transmission of an impact torque from the driven body to the driving source.

[0011] SOLUTION TO THE PROBLEM

[0012] The clutch device of one aspect of the present disclosure includes:

[0013] a first rotation member having a first rotation member side engagement portion;

[0014] a second rotation member having a second rotation member side engagement portion;

[0015] a third rotating member having a third rotating member side engagement portion;

[0016] an engagement member having a first engagement member side engagement portion capable of engaging with the first rotating member side engagement portion, a second engagement member side engagement portion capable of engaging with the second rotating member side engagement portion, and a third engagement member side engagement portion capable of engaging with the third rotating member side engagement portion; and

[0017] a flywheel fixed to the first rotating member.

[0018] In particular, in the clutch device of one aspect of the present disclosure, when torque is input to the second rotating member or the third rotating member, the second rotating member side engagement portion and the second engagement member side engagement portion engage, and the third rotating member side engagement portion and the third engagement member side engagement portion engage, whereby the first engagement member side engagement portion and the first rotating member side engagement portion engage while torque is transmitted between the second rotating member and the third rotating member, thereby becoming a stable rotation state in which the first rotating member and the flywheel, the second rotating member, the third rotating member, and the engagement member rotate integrally.

[0019] In addition, in the clutch device of one aspect of the present disclosure, when torque acting on the third rotating member increases sharply in the stable rotation state, based on an inertial force acting on the flywheel, the first rotating member side engagement portion presses the first engagement member side engagement portion, whereby the engagement member moves the third engagement member side engagement portion in a direction away from the third rotating member side engagement portion, the abutting pressure of the third engagement member side engagement portion and the third rotating member side engagement portion decreases or is lost, thereby becoming a torque transmission limiting state in which torque transmitted between the second rotating member and the third rotating member decreases or is lost.

[0020] The reverse cut-off clutch of one aspect of the present disclosure is provided with an urging member that elastically urges the engagement member in a direction in which the engagement member engages with the third rotating member side engagement portion and the third engagement member side engagement portion.

[0021] In the clutch device of one aspect of the present disclosure, the third rotating member can have the third rotating member side engagement portion on an inner peripheral surface,

[0022] the first rotating member side engagement portion can be disposed radially inward of the third rotating member side engagement portion,

[0023] the second rotating member side engagement portion can be disposed radially inward of the first rotating member side engagement portion,

[0024] The engagement member can have the second engagement portion on the radially inner side, can have the third engagement portion on the radially outer side, and can be configured to be movable in the first direction with respect to the third rotation member side engagement portion.

[0025] The clutch device according to one aspect of the present disclosure can be configured of two engagement members,

[0026] The first rotation member side engagement portion can be configured of two first rotation member side engagement portions.

[0027] The clutch device according to one aspect of the present disclosure can be assembled in a drive system that transmits torque of a drive source to a drive wheel.

[0028] Effects of Invention

[0029] The clutch device according to one aspect of the present disclosure can be assembled between a drive source and a driven body, and can prevent transmission of an impact torque from the driven body to the drive source. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of a part of a drive system of an electric vehicle in which the clutch device according to the first example of the embodiment of the present disclosure is assembled.

[0031] Figure 2 is a cross-sectional view of the clutch device according to the first example.

[0032] Figure 3 is a cross-sectional view of the clutch device according to the first example. Figure 2

[0033] Figure 4 is a cross-sectional view of the clutch device according to the first example. Figure 3

[0034] Figure 5 is a cross-sectional view of the clutch device according to the first example. Figure 3

[0035] Figure 6 (a) is a schematic view of the clutch device according to the first example. Figure 6 (e) is a schematic view of the clutch device according to the first example.

[0036] Figure 7 ​​​is a sectional view of the clutch device of the first example. Figure 3 The same sectional view.

[0037] Figure 8 (a) Figure 8 (d) is a schematic view for explaining the operation when the torque input from the output side is reversed and increased, of the clutch device of the first example.

[0038] Figure 9 is a schematic view of a drive system of an electric vehicle in which the clutch device of the second example of the embodiment of the present disclosure is assembled.

[0039] Figure 10 is a schematic view of a part of a drive system of a machine in which the clutch device of the third example of the embodiment of the present disclosure is assembled.

[0040] Figure 11 is a sectional view of the clutch device of the fourth example of the embodiment of the present disclosure.

[0041] Figure 12 is a B-B sectional view of Figure 11 DETAILED DESCRIPTION

[0042] [First Example]

[0043] Use Figures 1-8 (d) explains the first example of the embodiment of the present disclosure.

[0044] The clutch device 1 of the present example is provided with a first rotary member 2, a second rotary member 3, a third rotary member 4, an engaging member 5, and a flywheel 6 fixed to the first rotary member.

[0045] In the explanation of the clutch device 1, as long as there is no particular explanation, the axial direction, the radial direction, and the circumferential direction mean the axial direction, the radial direction, and the circumferential direction of the clutch device 1. The axial direction, the radial direction, and the circumferential direction of the clutch device 1 coincide with the axial direction, the radial direction, and the circumferential direction of the first rotary member 2, coincide with the axial direction, the radial direction, and the circumferential direction of the second rotary member 3, and coincide with the axial direction, the radial direction, and the circumferential direction of the third rotary member 4. With regard to the clutch device 1, the axial direction one side is the right side of Figure 1 and Figure 2 the axial direction other side is the left side of Figure 1 and Figure 2 With regard to these points, the same applies to the other embodiments described later.

[0046] The first rotary member 2 has a first rotary member side engaging portion 7.

[0047] ​In the present example, the first-rotating-member-side engaging portion 7 is provided at a portion deviated to the radial outer side from the rotation center O of the first rotating member 2, and has a portion engaged with the engaging-member-side first engaging portion 15 of the engaging member 5. The first-rotating-member-side engaging portion 7 is configured so that, with rotation of the first rotating member 2 or the engaging member 5, the radial inner side surface 9 thereof is engaged with the radial inner side surface 18 of the engaging-member-side first engaging portion 15.

[0048] In the present example, the first rotating member 2 has, in addition to the first-rotating-member-side engaging portion 7, a first shaft portion 8. The first shaft portion 8 has a stepped cylindrical shape composed of a small-diameter portion on one axial side and a large-diameter portion on the other axial side.

[0049] The first-rotating-member-side engaging portion 7 protrudes toward the other axial side from a portion deviated to the radial outer side from the rotation center O in the end surface of the other axial side of the first shaft portion 8.

[0050] The first-rotating-member-side engaging portion 7 is not limited in shape as long as it is configured to be engaged with the engaging-member-side first engaging portion 15 of the engaging member 5. The number of the first-rotating-member-side engaging portions 7 is determined in accordance with the number of the engaging members 5. In the case where the engaging member 5 is composed of a plurality of engaging members 5, the first-rotating-member-side engaging portion 7 is also composed of a plurality of (the same number as the engaging members 5) first-rotating-member-side engaging portions 7.

[0051] In the present example, the engaging member 5 is composed of two engaging members 5. Therefore, the first-rotating-member-side engaging portion 7 is composed of two first-rotating-member-side engaging portions 7 corresponding to the number of the engaging members 5. The two first-rotating-member-side engaging portions 7 are disposed at positions diametrically opposite to each other at the radial outer side of the end surface of the other axial side of the first shaft portion 8, and are separated from each other in the radial direction of the first rotating member 2. The first-rotating-member-side engaging portion 7 has a shape symmetrical in the circumferential direction.

[0052] In the present example, the first-rotating-member-side engaging portion 7 has an end surface shape substantially arcuate when viewed in the axial direction. That is, the radial inner side surface 9 of the first-rotating-member-side engaging portion 7 is composed of a flat surface orthogonal to a straight line connecting the rotation center O and the center of the first-rotating-member-side engaging portion 7 when viewed in the axial direction. The radial outer side surface 55 of the first-rotating-member-side engaging portion 7 is composed of a partial cylindrical surface having the rotation center O as the center. The side surfaces 56 on both circumferential sides of the first-rotating-member-side engaging portion 7 are composed of flat surfaces parallel to the straight line connecting the rotation center O and the center of the first-rotating-member-side engaging portion 7 when viewed in the axial direction. The connecting portions of the radial inner side surface 9 and the side surfaces 56 on both circumferential sides and the connecting portions of the radial outer side surface 55 and the side surfaces 56 on both circumferential sides are respectively composed of convex curved surfaces such as R chamfered portions.

[0053] The first rotating member 2 is rotatably supported by the third rotating member 4 or a non-illustrated fixed member disposed around the clutch device 1.

[0054] The second rotating member 3 has a second rotating member side engagement portion 10.

[0055] The second rotating member 3 is coaxially disposed with the first rotating member 2.

[0056] The second rotating member side engagement portion 10 has a portion that is radially inward of the first rotating member side engagement portion 7 but is offset radially outward from the rotation center O of the second rotating member 3, and is disposed at a position that can be engaged with the engagement member side second engagement portion 16 of the engagement member 5. The second rotating member side engagement portion 10 is configured so that, with rotation of the second rotating member 3 or the engagement member 5, the above-mentioned portion is engaged with the engagement member side second engagement portion 16.

[0057] In this example, the second rotating member 3 has a second shaft portion 11 in addition to the second rotating member side engagement portion 10. The second shaft portion 11 has a cylindrical shape.

[0058] The second rotating member side engagement portion 10 protrudes from the central portion of the end surface of the second shaft portion 11 toward the axial direction.

[0059] The second rotating member side engagement portion 10 is not limited in shape as long as it is configured to be engaged with the engagement member side second engagement portion 16. The number of portions of the second rotating member side engagement portion 10 that are engaged with the engagement member side second engagement portion 16 is determined according to the number of engagement members 5, and in the case where the engagement member 5 is composed of a plurality of engagement members 5, the second rotating member side engagement portion 10 is also configured to have a plurality (the same number as the engagement members 5) of the above-mentioned engaged portions.

[0060] In this example, the second rotating member side engagement portion 10 is configured to have two portions that are engaged with the engagement member side second engagement portion 16, corresponding to the number of engagement members 5.

[0061] In this example, the second rotating member side engagement portion 10 has a substantially rectangular end surface shape as viewed in the axial direction, and protrudes from the central portion of the end surface of the second shaft portion 11 toward the axial direction. That is, the distance from the rotation center O of the second rotating member 3 to the outer peripheral surface of the second rotating member side engagement portion 10, which is engaged with the engagement member side second engagement portion 16, is not constant in the circumferential direction. Therefore, the second rotating member side engagement portion 10 has a cam function.

[0062] More specifically, the outer peripheral surface of the second-rotating-member-side engaging portion 10 is constituted of two large flat surfaces 12 which are parallel to each other, two small flat surfaces 13 each of which has a width dimension smaller than the large flat surfaces 12 when viewed in the axial direction, and a convex curved surface such as an R chamfer portion which connects the large flat surfaces 12 and the small flat surfaces 13. Therefore, the distance from the rotation center O of the second rotating member 3 to the outer peripheral surface of the second-rotating-member-side engaging portion 10 is not constant in the circumferential direction.

[0063] The second-rotating-member-side engaging portion 10 is face-symmetrical with respect to an imaginary plane which passes through the rotation center O of the second rotating member 3 and is orthogonal to the large flat surfaces 12. Also, the second-rotating-member-side engaging portion 10 is face-symmetrical with respect to an imaginary plane which passes through the rotation center O of the second rotating member 3 and is parallel to the large flat surfaces 12.

[0064] Such a second-rotating-member-side engaging portion 10 is disposed in a portion between the two first-rotating-member-side engaging portions 7.

[0065] The second rotating member 3 is rotatably supported by the third rotating member 4 or the above-described fixed portion.

[0066] The third rotating member 4 has a third-rotating-member-side engaging portion 14.

[0067] The third rotating member 4 is coaxially disposed with the first rotating member 2 and the second rotating member 3. In this example, the third-rotating-member-side engaging portion 14 is disposed on the inner peripheral surface of the third rotating member 4. In this example, the first-rotating-member-side engaging portion 7 of the first rotating member 2 and the second-rotating-member-side engaging portion 10 of the second rotating member 3 are coaxially disposed on the radially inner side of the third-rotating-member-side engaging portion 14, and the engaging member 5 is disposed so as to be able to move in the direction of proximity and distance with respect to the third-rotating-member-side engaging portion 14. On the radially inner side of the third-rotating-member-side engaging portion 14, the first-rotating-member-side engaging portion 7, the second-rotating-member-side engaging portion 10, and the engaging member 5 are rotatable. The third-rotating-member-side engaging portion 14 constitutes a surface which comes into contact with the engaging-member-side third engaging portion 17 of the engaging member 5 in the case where the engaging member 5 moves in the direction of proximity to the third-rotating-member-side engaging portion 14.

[0068] In this example, the third-rotating-member-side engaging portion 14 is circular ring-shaped when viewed in the axial direction, and in this example, has a shape of a cylindrical surface whose inner diameter does not change in the axial direction, but is not limited thereto.

[0069] In this example, the third rotating member 4 is rotatably supported with respect to at least any one of the above-described first rotating member 2, the above-described second rotating member 3, and the above-described fixed portion. The third rotating member 4 is not limited in shape as long as it has the third-rotating-member-side engaging portion 14 on the inner peripheral surface.

[0070] In this example, the third rotating component 4 has at least a cylindrical portion having a third rotating component side engaging portion 14 on its inner circumferential surface.

[0071] The engaging member 5 has a first engaging part 15 on the engaging member side that can engage with the first rotating member side engaging part 7, a second engaging part 16 on the engaging member side that can engage with the second rotating member side engaging part 10, and a third engaging part 17 on the engaging member side that can engage with the third rotating member side engaging part 14.

[0072] In this example, the engaging member 5 is configured to move in the near-far direction, i.e., the first direction, relative to the third rotating member side engaging portion 14.

[0073] In the clutch device 1, when torque is input to the second rotating component 3 or the third rotating component 4, the second rotating component side engagement portion 10 and the engagement member side second engagement portion 16 engage, and the third rotating component side engagement portion 14 and the engagement member side third engagement portion 17 engage. Thus, while torque is transmitted between the second rotating component 3 and the third rotating component 4 via the engagement member 5, the engagement member side first engagement portion 15 and the first rotating component side engagement portion 7 engage with the rotation of the engagement member 5, thereby achieving a stable rotational state in which the first rotating component 2 and the flywheel 6, the second rotating component 3, the third rotating component 4, and the engagement member 5 rotate as a whole.

[0074] In the clutch device 1, when the torque input to the third rotating component 4 increases sharply during operation in the stable rotational state, the first rotating component side engaging part 7 presses the first engaging part 15 on the engaging member side based on the inertial force acting on the flywheel 6. As a result, the engaging member 5 causes the third engaging part 17 on the engaging member side to move away from the third rotating component side engaging part 14. The contact pressure between the third engaging part 17 on the engaging member side and the third rotating component side engaging part 14 is reduced or lost, thereby creating a torque transmission restriction state in which the torque transmitted between the second rotating component 3 and the third rotating component 4 is reduced or lost.

[0075] As long as the locking element 5 can achieve the above-mentioned stable rotation state and the above-mentioned torque transmission restriction state, it can be composed of one locking element 5 or two or more locking elements 5.

[0076] 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 a generally semi-circular end face shape when viewed from the axial direction, and has a width direction ( Figure 3 The shape is symmetrical in the direction indicated by the middle arrow B. The structure of each snap-fit ​​component 5 will be described below.

[0077] In the present example, the radial direction with respect to the engaging member 5 refers to the direction of the distance of the engaging member side third engaging portion 17 with respect to the third rotating member side engaging portion 14, and corresponds to the direction of the arrow A in FIG. 6. Figure 3 The width direction with respect to the engaging member 5 refers to the direction orthogonal to both the direction of the distance of the engaging member side third engaging portion 17 with respect to the third rotating member side engaging portion 14 and the axial direction of the third rotating member side engaging portion 14, and corresponds to the direction of the arrow B in FIG. 6. In the present example, the radial direction with respect to the engaging member 5 corresponds to the first direction. Figure 3

[0078] The engaging member side third engaging portion 17 is provided on the radially outer side surface of the engaging member 5 opposite the third rotating member side engaging portion 14. In the present example, the engaging member side third engaging portion 17 is composed of two engaging member side third engaging portions 17 provided at two positions separated in the circumferential direction on the radially outer side surface of the engaging member 5. Each of the engaging member side third engaging portions 17 is composed of a convex curved surface in the shape of a portion of a cylindrical surface having a smaller radius of curvature than the radius of curvature of the third rotating member side engaging portion 14.

[0079] In a view from the axial direction, a portion of the radially outer side surface of the engaging member 5 offset in the circumferential direction from the two engaging member side third engaging portions 17 is present radially inward of an imaginary circle centered on the rotation center O of the first rotating member 2 and tangent to the two engaging member side third engaging portions 17. That is, in a state in which the two engaging member side third engaging portions 17 are in abutment with the third rotating member side engaging portion 14, the portion offset in the circumferential direction from the two engaging member side third engaging portions 17 is not in abutment with the third rotating member side engaging portion 14.

[0080] Preferably, the engaging member side third engaging portion 17 has a surface property with a larger coefficient of friction with respect to the third rotating member side engaging portion 14 than the coefficient of friction of other portions of the engaging member 5 with respect to the third rotating member side engaging portion 14. The engaging member side third engaging portion 17 can be integrally formed with other portions of the engaging member 5, or can be composed of the surface of a friction member fixed to other portions of the engaging member 5 by adhesion or the like.

[0081] In the present example, the engaging member side first engaging portion 15 is provided at a radially intermediate portion of the width direction central portion of the engaging member 5. The shape of the engaging member side first engaging portion 15 is not limited as long as it is configured to be engageable with the first rotating member side engaging portion 7.

[0082] In the present example, the engaging member side first engaging portion 15 has an opening shape that is substantially arcuate in a view from the axial direction, and is composed of a through-hole that penetrates the radially intermediate portion of the width direction central portion of the engaging member 5 in the axial direction.

[0083] ​The first engaging portion 15 on the engaging member side is sized to allow the first rotating member side engaging portion 7 to be loosely inserted. Therefore, when the first rotating member side engaging portion 7 is inserted into the inner side of the first engaging portion 15 on the engaging member side, gaps exist between the inner surfaces of the first rotating member side engaging portion 7 and the first engaging portion 15 on the engaging member side, both in the width direction and radially. Therefore, the first rotating member side engaging portion 7 can be displaced relative to the first engaging portion 15 on the engaging member side in the rotational direction of the first rotating member 2, and the first engaging portion 15 on the engaging member side can be displaced radially relative to the first rotating member side engaging portion 7. In this example, the radially inner surface 18 facing radially outward on the inner surface of the first engaging portion 15 on the engaging member side is formed by a flat surface orthogonal to the first direction.

[0084] In this example, the second engaging portion 16 on the engaging member side is disposed at the center of the radially inner side surface of the engaging member 5 in the width direction. The shape of the second engaging portion 16 on the engaging member side is not limited as long as it is configured to engage with the second rotating member side engaging portion 10.

[0085] In this example, the engaging member 5 has a flat surface 19 on its radially inner side that is orthogonal to the radial direction of the engaging member 5. The engaging member 5 has a central recess 20 at the center of the flat surface 19 in the width direction, which is recessed radially outward, and two generally rectangular guide recesses 21 at two locations on both sides of the flat surface 19 in the width direction, which are recessed radially outward.

[0086] The central recess 20 has a short side direction that allows for a loosely arranged second rotating component side engaging portion 10 inside it. Figure 3 The size and shape of the half (in the vertical direction). Specifically, the central recess 20 has a larger size and shape than the second rotating component side engaging portion 10 in the long side direction (in the vertical direction). Figure 3 The central recess 20 has a large opening width in the left-right direction and a radial depth smaller than half the dimension of the short side of the second rotating member side engaging portion 10. The bottom surface of the central recess 20 is formed by a flat surface orthogonal to the radial direction of the engaging member 5. In this example, the second engaging portion 16 on the engaging member side is formed by the bottom surface of the central recess 20.

[0087] In the present example, the two engaging members 5 are disposed radially inward of the third-rotating-member-side engaging portion 14 so as to be movable in the first direction in a state in which the engaging-member-side third engaging portions 17 of the two engaging members 5 face each other in opposite directions in the radial direction and the flat surface portions 19 face each other. Further, the two first-rotating-member-side engaging portions 7 of the first rotating member 2 are inserted axially between the engaging-member-side first engaging portions 15 of the two engaging members 5, and the second-rotating-member-side engaging portion 10 of the second rotating member 3 is inserted axially between the engaging-member-side second engaging portions 16 of the two engaging members 5. That is, the two engaging members 5 are disposed so as to sandwich the second-rotating-member-side engaging portion 10 from the radially outer side via the respective engaging-member-side second engaging portions 16.

[0088] The inner diameter dimension of the third-rotating-member-side engaging portion 14 and the radial dimension of the engaging member 5 are limited so that, in a state in which the two engaging members 5 are disposed radially inward of the third-rotating-member-side engaging portion 14, a gap exists in at least one of the portion between the third-rotating-member-side engaging portion 14 and the engaging-member-side third engaging portions 17 and the portion between the flat surface portions 19 of the two engaging members 5.

[0089] The flywheel 6 is fixed to the first rotating member 2.

[0090] The flywheel 6, by being fixed to the first rotating member 2, constitutes a combination with the first rotating member 2, and is a component for ensuring a large mass of the combination. The flywheel 6 is not limited in shape and size as long as it can avoid interference with objects disposed around.

[0091] The mass of the flywheel 6 is appropriately adjusted according to the magnitude of the impact torque that should be limited from being transmitted from the third rotating member 4 to the second rotating member 3.

[0092] Specifically, in the case where the clutch device 1 is assembled in a drive system of a vehicle and used, the mass of the flywheel 6 is adjusted to a magnitude such that, at the moment when a drive wheel of the above-described vehicle floats from the road surface and lands again during travel of the above-described vehicle or when the above-described vehicle is rear-ended by a following vehicle, an impact torque that is input in the reverse direction to the third rotating member 4 based on an impact torque applied to the above-described drive wheel is not transmitted to the second rotating member 3. However, from the viewpoint of reduction of loss when the second rotating member 3 is rotationally driven by the drive source 23 and lightening of the clutch device 1, the mass of the flywheel 6 is preferably minimized within a range in which the transmission of the impact torque from the third rotating member 4 to the second rotating member 3 can be limited.

[0093] In the present example, the flywheel 6 has a substantially circular plate shape, and is fixed to an end portion on one side in the axial direction of the first shaft portion 8 in a state in which it is disposed coaxially with the first rotating member 2.

[0094] The clutch device 1 of this example further has a force applying member 22 as an arbitrary constituent element. The force applying member 22 elastically applies a force to the engaging members 5 in a direction in which the third-rotating-member-side engaging portion 14 and the engaging-member-side third engaging portion 17 are engaged, that is, in a direction in which the engaging-member-side third engaging portion 17 approaches the third-rotating-member-side engaging portion 14 in the first direction. The force applying member 22 is not particularly limited in shape or number as long as it has such a function.

[0095] In this example, the force applying member 22 is composed of two force applying members 22 disposed between the two engaging members 5. The two force applying members 22 are each composed of a compression coil spring. The compression coil springs that constitute the respective force applying members 22 are held by being inserted into the guide recesses 21 disposed between the two engaging members 5 at both axial sides thereof. In the case of implementing the present disclosure, the force applying member can also be composed of various springs other than a compression coil spring, such as a leaf spring disposed between the second rotating member and the engaging member, and the like.

[0096] In this example, the force applying member 22 elastically applies a force to the engaging members 5 in a direction in which the engaging-member-side third engaging portion 17 approaches the third-rotating-member-side engaging portion 14 in the first direction, so the postures of the two engaging members 5 can be synchronized, and the postures of the respective engaging members 5 can be stabilized, enabling accurate movement of the respective engaging members 5 in the radial direction. In addition, by the inertial rotational force of the first rotating member 2 and the flywheel 6, based on the engagement of the first-rotating-member-side engaging portion 7 and the engaging-member-side first engaging portion 15, the engaging-member-side third engaging portions 17 of the two engaging members 5 can be pressed against the third-rotating-member-side engaging portion 14, in addition to the case in which the engaging members 5 move the engaging-member-side third engaging portions 17 in a direction away from the third-rotating-member-side engaging portion 14.

[0097] In this example, as shown in Figure 1 , the clutch device 1 is assembled in a drive system (drive device) of an electric automobile. However, the use of the clutch device of the present disclosure is not limited to this. The clutch device of the present disclosure can be assembled between a drive source and a driven body of various mechanical devices and used.

[0098] The drive system of the electric automobile of this example has a drive source 23, a rotating shaft 24 that is connected to a drive wheel as a driven body so as to be able to transmit torque via other drive members, and a clutch device 1 that is assembled between the drive source 23 and the rotating shaft 24.

[0099] The drive source 23 is composed of an electric motor. In this example, the second shaft portion 11 (see Figure 2 ) of the second rotating member 3 that constitutes the clutch device 1 is provided at the front end of the output shaft 25 of the drive source 23 integrally with the output shaft 25, or is connected to the front end of the output shaft 25 so as to be able to transmit torque.

[0100] In the present example, the third rotary member 4 constituting the clutch device 1 is provided with a gear portion 26 on the outer peripheral surface (only in Figure 1 is illustrated). The rotation shaft 24 is provided with a gear portion 27 on the base end portion, which is engaged with the gear portion 26 of the third rotary member 4. Thereby, torque can be transmitted between the third rotary member 4 and the rotation shaft 24.

[0101] Using Figure 4 , Figure 5 , Figure 6 (a) ~ Figure 6 (e), Figure 7 and Figure 8 (a) ~ Figure 8 (d), the operation of the clutch device 1 of the present example will be described. Figure 4 , Figure 5 and Figure 7 The gaps in the radial direction between the first rotary member 2 and the second rotary member 3 and the two engaging members 5 are exaggeratedly shown. Figure 6 (a) ~ Figure 6 (e), and Figure 8 (a) ~ Figure 8 (d) are diagrams schematically showing the cross sections of the same parts as Figure 4 , Figure 5 and Figure 7 .

[0102] In the drive system in which the clutch device 1 of the present example is assembled, when torque is input to the second rotary member 3 by rotationally driving the output shaft 25 of the drive source 23, the second rotary member side engaging portion 10 rotates in the rotation direction of the second rotary member 3 (in the clockwise direction in the example of Figure 4 , regardless of the rotation direction of the second rotary member 3, between the engaging member side second engaging portions 16 of the two engaging members 5. Then, the engaging member side second engaging portions 16 are pressed to the radially outer side by the connection portions (corners) of the large flat surface 12 and the small flat surface 13 in the outer peripheral surface of the second rotary member side engaging portion 10, and the engaging member side third engaging portions 17 of the two engaging members 5 are pressed against the third rotary member side engaging portion 14 and frictionally engaged.

[0103] As a result, the torque input to the second rotary member 3 is transmitted to the third rotary member 4 via the two engaging members 5. Thereby, when the second rotary member 3, the two engaging members 5, and the third rotary member 4 become integrated and start to rotate, as Figure 4 and Figure 6(a) shown, the radially inner side surface 18 of the first engagement portion 15 of the engagement member 5 engages with the radially inner side surface 9 of the first rotation member side engagement portion 7. Thereby, the first rotation member 2 and the flywheel 6 become integrated with the second rotation member 3, the two engagement members 5, and the third rotation member 4 and rotate. That is, a stable rotation state in which the first rotation member 2 and the flywheel 6 and the second rotation member 3, the third rotation member 4, and the two engagement members 5 rotate integrally while transmitting the forward torque from the second rotation member 3 to the third rotation member 4 is established. In Figure 6 (a) Figure 6 (e) shown, the solid arrows marked on each member indicate the rotation direction of the member, and the length of the solid arrow indicates the magnitude of the rotation speed.

[0104] In the stable rotation state in which the above-described forward torque transmission is performed, the torque transmitted from the second rotation member 3 to the third rotation member 4 via the two engagement members 5 is transmitted to the rotation shaft 24 via the meshing portion of the gear portion 26 and the gear portion 27, and then transmitted to the above-described drive wheel via the above-described other drive members from the rotation shaft 24.

[0105] On the other hand, when the accelerator is cut and the vehicle runs by inertia, the torque is inputted in the reverse direction from the road surface to the third rotation member 4 via the above-described drive wheel, and the two engagement members 5 rotate integrally with the third rotation member 4 regardless of the rotation direction of the third rotation member 4. That is, in a neutral state in which no torque is applied to the second rotation member 3 and the third rotation member 4 respectively, the third rotation member 4 and the two engagement members 5 are in a state in which the third engagement portion 17 of the engagement member side is pressed against the third rotation member side engagement portion 14 by the elastic force of the force applying member 22, and the third rotation member side engagement portion 14 and the third engagement portion 17 of the engagement member side are in frictional engagement. Therefore, when the torque is inputted in the reverse direction to the third rotation member 4, the two engagement members 5 rotate integrally with the third rotation member 4 regardless of the rotation direction of the third rotation member 4.

[0106] When the two engagement members 5 rotate integrally with the third rotation member 4, as Figure 7 and Figure 8 (a) shown, the second engagement portion 16 of the engagement member side engages with the connecting portion (corner) of the large flat surface 12 and the small flat surface 13 in the outer peripheral surface of the second rotation member side engagement portion 10.

[0107] As a result, the torque inputted to the third rotation member 4 is transmitted to the second rotation member 3 via the two engagement members 5. Thereby, when the second rotation member 3, the two engagement members 5, and the third rotation member 4 become integrated and start to rotate, as Figure 7 and Figure 8(a) shown, the radially inner side surface 18 of the first engaging portion 15 of the engaging member side of the two engaging members 5 engages with the radially inner side surface 9 of the first rotating member side engaging portion 7. Thereby, the first rotating member 2 and the flywheel 6 become integrated with the second rotating member 3, the two engaging members 5, and the third rotating member 4 and rotate. That is, a stable rotation state in which the first rotating member 2 and the flywheel 6 and the second rotating member 3, the third rotating member 4, and the two engaging members 5 rotate integrally while transmitting the reverse direction torque from the third rotating member 4 to the second rotating member 3 is established. In Figure 8 (a) Figure 8 In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state.

[0108] In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state.

[0109] In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state.

[0110] In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state.

[0111] In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state.

[0112] First, in Figure 4 and Figure 6 In the stable rotation state in which the reverse direction torque is transmitted, the torque transmitted from the third rotating member 4 to the second rotating member 3 via the two engaging members 5 is transmitted to the output shaft 25 of the drive source 23, and the electric motor constituting the drive source 23 becomes a regenerative state. Figure 6(b) shown, the rotational speed of the clutch device 1 as a whole, that is, the first rotating member 2 and the flywheel 6 and the second rotating member 3, the third rotating member 4, and the engaging member 5 as a whole, increases.

[0113] After that, when the grip of the above-mentioned drive wheel is recovered, the frictional force acting between the drive wheel and the road surface sharply increases, the torque applied to the drive wheel sharply increases, and the rotational speed of the drive wheel sharply decreases. Thus, as Figure 6 (c) shown, the torque reversely input to the third rotating member 4 sharply increases, and the rotational speed of the third rotating member 4 sharply decreases. Also with respect to the two engaging members 5, the rotational speed decreases as with the third rotating member 4 due to the frictional engagement of the respective engaging member-side third engaging portions 17 and the third rotating member-side engaging portions 14.

[0114] On the contrary, the combination of the first rotating member 2 and the flywheel 6 wants to continue to rotate at the original rotational speed due to its inertial force, and relatively rotates toward the front side in the rotational direction (in Figure 6 the clockwise direction in the example of (c)) with respect to the two engaging members 5. As a result, as Figure 6 (c) to Figure 6 (d) shown, the radially inner side surface 9 of the first rotating member-side engaging portion 7 presses the radially inner side surface 18 of the engaging member-side first engaging portion 15.

[0115] As a result, the two engaging members 5 move the engaging member-side third engaging portions 17 in the direction away from the third rotating member-side engaging portions 14, that is, the radially inner side, against the force of the two force applying members 22 toward the radially outer side. Then, the abutting pressure of the engaging member-side third engaging portions 17 and the third rotating member-side engaging portions decreases, or as Figure 5 and Figure 6 (d) shown, the engaging member-side third engaging portions 17 and the third rotating member-side engaging portions 14 are separated, and the abutting pressure of the engaging member-side third engaging portions 17 and the third rotating member-side engaging portions 14 is lost. Thus, a torque transmission limiting state in which the torque transmitted from the third rotating member 4 to the second rotating member 3 decreases or is lost is established.

[0116] As a result, it is possible to prevent the impact torque from being applied from the above-mentioned drive wheel to the drive source 23.

[0117] Due to the inertial rotational force of the combination of the first rotating member 2 and the flywheel 6, as Figure 6 (c) to Figure 6(d) The radially inner side 9 of the first rotating member side engaging portion 7 presses the radially inner side 18 of the engaging member side first engaging portion 15 as shown, and this phenomenon occurs immediately after the grip of the drive wheel recovers. Thereafter, the inertial force decreases, and the force toward the radially outer side of the two force applying members 22 exceeds the inertial force, whereby the engaging member side third engaging portion 17 and the third rotating member side engaging portion 14 strongly abut, and the rotational speed of the combination of the first rotating member 2 and the flywheel 6 and the rotational speed of the third rotating member 4 become the same, so that the stable rotational state in which the above-described forward torque is transmitted is returned to as shown in Figure 6 (e) The stable rotational state in which the above-described forward torque is transmitted is returned to as shown.

[0118] On the other hand, in the stable rotational state in which the above-described reverse torque is transmitted, when the above-described vehicle is rear-ended by a following vehicle or the like, for example, a reverse torque is sharply increased which is input from the road surface to the drive wheel. Due to this, a reverse torque which is input to the third rotating member 4 is sharply increased.

[0119] In the clutch device 1 of this example, in the stable rotational state, regardless of the direction of transmission of torque between the second rotating member 3 and the third rotating member 4, in the case where an impact torque is reversely input to the third rotating member 4 in conjunction with the vehicle being rear-ended by another vehicle or the like, the impact torque can be prevented from being transmitted to the second rotating member 3 as follows.

[0120] For example, in Figure 7 and Figure 8 (a) In the stable rotational state in which the above-described reverse torque is transmitted as shown, when the reverse torque which is input to the third rotating member 4 is sharply increased, the rotational speed of the third rotating member 4 is sharply increased. Figure 8 (b) As shown, when the reverse torque which is input to the third rotating member 4 is sharply increased, the rotational speed of the third rotating member 4 is sharply increased.

[0121] In contrast to this, the combination of the first rotating member 2 and the flywheel 6 wants to continue to rotate at the original rotational speed due to the inertial force thereof, and relatively rotates toward the rear side in the rotational direction with respect to the two engaging members 5. As a result, as shown in Figure 8 (b) to Figure 8 (c) The radially inner side 9 of the first rotating member side engaging portion 7 presses the radially inner side 18 of the engaging member side first engaging portion 15. In addition, Figure 8 The dotted arrow shown in (c) indicates the direction of the inertial force of the combination of the first rotating member 2 and the flywheel 6.

[0122] As a result, the two engaging members 5 move the engaging member side third engaging portion 17 in the direction away from the third rotating member side engaging portion 14, that is, the radially inner side, against the force toward the radially outer side of the two force applying members 22. Then, the abutment pressure of the engaging member side third engaging portion 17 and the third rotating member side engaging portion is reduced, or as shown in Figure 8As shown in Figure C, the third engaging portion 17 on the engaging member side and the engaging portion 14 on the third rotating member side separate, and the contact pressure between the third engaging portion 17 on the engaging member side and the engaging portion 14 on the third rotating member side is lost. As a result, a torque transmission restriction state is formed, where the torque transmitted between the third rotating member 4 and the second rotating member 3 is reduced or lost.

[0123] As a result, it is possible to prevent the application of impact torque from the aforementioned drive wheel to the drive source 23.

[0124] Due to the inertial rotational force of the combination of the first rotating component 2 and the flywheel 6, as Figure 8 (c) The phenomenon shown occurs when the radially inner surface 9 of the first rotating component side engaging portion 7 presses against the radially inner surface 18 of the first engaging portion 15 on the engaging member side. This occurs immediately after the torque input to the third rotating component 4 in the reverse direction increases sharply. Afterward, the aforementioned inertial rotational force decreases, and the radially outward force of the two force-applying components 22 exceeds this inertial rotational force. Consequently, the third engaging portion 17 on the engaging member side and the third rotating component side engaging portion 14 strongly abut against each other. The rotational speed of the combination of the first rotating component 2 and the flywheel 6 becomes the same as the rotational speed of the third rotating component 4. Therefore, as shown... Figure 9 As shown in (d), the system returns to a stable rotational state where the reverse torque transmission is performed.

[0125] In the clutch device 1 of this example, in addition to the above-mentioned situation, there is also the following situation: for example, in the stable rotational state of transmitting the above-mentioned positive torque, if the torque input to the third rotating component 4 increases sharply due to the vehicle being rear-ended by the following vehicle, and the rotational speed of the third rotating component 4 increases sharply, the engagement member 5 is pressed radially inward because the first rotating component 2 rotates slowly, and switches to the above-mentioned torque transmission restriction state.

[0126] In any of the above scenarios, the rate of increase in torque acting on the third rotating component 4 required to transition from the stable rotational state to the torque transmission limiting state is determined by the mass of the flywheel 6 fixed to the first rotating component 2. That is, the greater the mass of the flywheel 6, the smaller the rate of increase in torque acting on the third rotating component 4 required to transition from the stable rotational state to the torque transmission limiting state.

[0127] According to the clutch device 1 in this example, it is possible to prevent the application of impact torque from the drive wheel to the drive source 23, thereby enabling the miniaturization and weight reduction of the components constituting the drive system of the electric vehicle.

[0128] [Second Example]

[0129] use Figure 9 A second example of an embodiment of this disclosure will be described.

[0130] This example is an example in which the clutch device la is incorporated into a drive system (drive device) of an electric vehicle having a three-axle drive axle configuration.

[0131] The drive system of the electric vehicle of this example has a drive source 23a composed of an electric motor, a power transmission mechanism 28, a differential device 29, two drive axles 30, and the clutch device la. The drive system transmits torque generated by the drive source 23a to the differential device 29 after increasing the torque by the power transmission mechanism 28, and distributes the torque to the two drive axles 30 by the differential device 29. Thereby, rotational drive is given to drive wheels 54 supported by suspensions at the front end portions of the two drive axles 30.

[0132] In this example, the power transmission mechanism 28 is composed of a gear type speed reducer. The power transmission mechanism 28 has a drive gear 31, an intermediate shaft 32, an intermediate gear 33, and a final speed reduction gear 34. The drive gear 31 is fixed to the front end portion of an output shaft 25a (first shaft) of the drive source 23a. The intermediate shaft 32 (second shaft) is rotatably supported to a gear case not shown in a state of being arranged in parallel to the output shaft 25a of the drive source 23a. The intermediate gear 33 has a larger number of teeth than the drive gear 31, and is fixed to the portion of the intermediate shaft 32 on the one side in the axial direction (right side in FIG. 6). The intermediate gear 33 is engaged with the drive gear 31. The final speed reduction gear 34 has a smaller number of teeth than the intermediate gear 33, and is fixed to the portion of the intermediate shaft 32 on the other side in the axial direction (left side in FIG. 6). Figure 9 Figure 10

[0133] The differential device 29 has a differential case 35, two pinions 57, and two side gears 37.

[0134] The differential case 35 has a central shaft arranged in parallel to the output shaft 25a of the drive source 23a, and is supported so as to be able to rotate about the central shaft. The differential case 35 has a ring gear 36 at the radially outer portion. The ring gear 36 has a larger number of teeth than the final speed reduction gear 34, and is engaged with the final speed reduction gear 34. The differential case 35 has a support shaft 58 orthogonal to the central shaft of the differential case 35 at the radially inner portion.

[0135] The two pinions 57 are arranged at the radially inner portion of the differential case 35, and are rotatably supported to the support shaft 58 at the axial both sides of the support shaft 58.

[0136] The two side gears 37 are coaxial with the differential case 35, and are arranged at the radially inner portion of the differential case 35 at the axial both sides so as to be rotatable with respect to the differential case 35, and are engaged with the two pinions 57. The two side gears 37 are fixed to the base end portions of the two drive axles 30 (third shafts). ​​

[0137] In the present example, the clutch device la is assembled to the intermediate portion of the output shaft 25a of the driving source 23a. That is, in the present example, the output shaft 25a is provided with a base end side shaft portion 38 and a front end side shaft portion 39 which are coaxially arranged with each other. The clutch device la is assembled between the base end side shaft portion 38 and the front end side shaft portion 39.

[0138] More specifically, the second shaft portion 11 of the second rotary member 3 which constitutes the clutch device la is provided to the front end portion of the base end side shaft portion 38 integrally with the base end side shaft portion 38, or is connected to the front end portion of the base end side shaft portion 38 so as to be able to transmit torque. The third rotary member 4a which constitutes the clutch device la is provided to the base end portion of the front end side shaft portion 39 integrally with the front end side shaft portion 39, or is connected to the base end portion of the front end side shaft portion 39 so as to be able to transmit torque.

[0139] In the clutch device la of the present example, the first shaft portion 8a of the first rotary member 2a and the flywheel 6a have through holes which penetrate in the axial direction at the respective radial center portions, and the second shaft portion 11 of the second rotary member 3 or the base end side shaft portion 38 is inserted into the through holes. By adopting such a structure, the clutch device la can be assembled coaxially with the rotary shaft (the output shaft 25a in the present example) at the intermediate portion of the rotary shaft.

[0140] In the present example, the clutch device of the present disclosure is assembled to the first shaft (the output shaft of the driving source) in a driving system of a driving bridge configuration which is provided with three shafts. However, in the case of implementing the present disclosure, the clutch device of the present disclosure can also be assembled to the second shaft (the intermediate shaft) or the third shaft (at least either one of the two driving shafts, preferably both).

[0141] The other structures and effects of the second example are the same as those of the first example.

[0142] [Third Example]

[0143] Use Figure 6 A third example of an embodiment of the present disclosure will be described.

[0144] In the present example, in a driving system of various mechanical devices, the third rotary member 4 which constitutes the clutch device 1 is arranged on the driving source 40 side which generates torque, and the second rotary member 3 which constitutes the clutch device 1 is arranged on the driven body side.

[0145] More specifically, in the present example, the rotary shaft 24 is provided to the front end portion of the output shaft 41 of the driving source 40 integrally with the output shaft 41, or is connected to the front end portion of the output shaft 41 so as to be able to transmit torque. That is, the torque generated by the driving source 40 is input to the third rotary member 4 via the meshing portions of the two gear portions 26, 27. The second shaft portion 11 of the second rotary member 3 is connected to the above-mentioned driven body so as to be able to transmit torque directly or via a gear transmission device or the like.

[0146] In the structure of this example, according to the use Figure 6 (a) Figure 8 (e) and Figure 8 (a) Figure 11 (d) explained principle, can prevent the application of impact torque from the driving source 40 to the driven body described above.

[0147] The other structures and effects of the third example are the same as the first example.

[0148] [Fourth Example]

[0149] Using Figure 12 and Figure 11 The fourth example of the embodiment of the present disclosure is explained.

[0150] In this example, the clutch device 1b is configured differently from the first example.

[0151] The clutch device 1b of this example has a first rotating member 42, a second rotating member 43, a third rotating member 44, an engaging member 45, a flywheel 6b, and a force applying member 46.

[0152] The first rotating member 42 is disposed on the one side in the axial direction of the clutch device 1b (the right side of FIG. 1), has a first shaft portion 47 and a first cylindrical portion 48 elongated toward the other side in the axial direction from the radially outer end portion of the end portion of the first shaft portion 47 (the left side of FIG. 1). The first cylindrical portion 48 has holding holes 49 penetrating in the radial direction at a plurality of positions at intervals in the circumferential direction at the middle portion in the axial direction. The first cylindrical portion 48 has a first rotating member side engaging portion 50 at the portion between the holding holes 49 adjacent in the circumferential direction. Figure 11 Figure 12 The second rotating member 43 is constituted by a shaft member disposed coaxially with the first rotating member 42 on the other side in the axial direction of the clutch device 1b. The second rotating member 43 has a second rotating member side engaging portion 51 constituted by a flat surface at a plurality of positions (the same number as the first rotating member side engaging portion 50) at intervals in the circumferential direction on the outer peripheral surface of the end portion on the one side in the axial direction. The end portion on the one side in the axial direction of the second rotating member 43 is inserted into the radially inner side of the first cylindrical portion 48 constituting the first rotating member 42 with a radial gap. In this state, the second rotating member side engaging portion 51 and the holding holes 49 are disposed at substantially the same position in the circumferential direction.

[0153] The second rotating member 43 is constituted by a shaft member disposed coaxially with the first rotating member 42 on the other side in the axial direction of the clutch device 1b. The second rotating member 43 has a second rotating member side engaging portion 51 constituted by a flat surface at a plurality of positions (the same number as the first rotating member side engaging portion 50) at intervals in the circumferential direction on the outer peripheral surface of the end portion on the one side in the axial direction. The end portion on the one side in the axial direction of the second rotating member 43 is inserted into the radially inner side of the first cylindrical portion 48 constituting the first rotating member 42 with a radial gap. In this state, the second rotating member side engaging portion 51 and the holding holes 49 are disposed at substantially the same position in the circumferential direction.

[0154] ​The third rotary member 44 is configured in a cylindrical shape, and is coaxially disposed around the first rotary member 42 and the second rotary member 43. The third rotary member 44 has a third rotary member side engagement portion 52, which is configured by a cylindrical surface, in an axially intermediate portion of an inner peripheral surface. The third rotary member 44 has its axially both sides portions rotatably supported by two rolling bearings 53a, 53b to the first rotary member 42 and the second rotary member 43, in a state where the third rotary member side engagement portion 52 is disposed around the first cylindrical portion 48 configuring the first rotary member 42. The interval between the second rotary member side engagement portion 51 and the third rotary member side engagement portion 52 gradually decreases toward the circumferential both sides.

[0155] The engagement members 45 are configured by a plurality of engagement members 45 each configured by a cylindrical roller. The engagement members 45 are disposed between the second rotary member side engagement portion 51 and the third rotary member side engagement portion 52 in the radial direction, in a state where two are held on the inner side of the holding hole 49 configuring the first rotary member 42. On the outer peripheral surface of the engagement member 45, the portion engaged with the first rotary member side engagement portion 50 becomes a first engagement member side engagement portion, the portion engaged with the second rotary member side engagement portion 51 becomes a second engagement member side engagement portion, and the portion engaged with the third rotary member side engagement portion 52 becomes a third engagement member side engagement portion.

[0156] The flywheel 6b is coaxially fixed to the end portion on the axially one side side of the first shaft portion 47 configuring the first rotary member 42.

[0157] The urging members 46 are configured by a plurality of urging members 46 each configured by a spring member. The urging members 46 are each disposed one between the two engagement members 45 held on the inner side of the holding hole 49. The two engagement members 45 are elastically urged by the urging members 46 in a direction away from each other.

[0158] Figure 1 A state of the neutral position of the first rotary member 42, the second rotary member 43, the third rotary member 44, the engagement members 45, and the urging members 46 is shown. The two engagement members 45 held on the holding hole 49 are pressed by the urging members 46 in a direction away from each other, and thus each engagement member 45 is slightly engaged in a wedge shape to the circumferential both side portions between the second rotary member side engagement portion 51 and the third rotary member side engagement portion 52. In this state, there is a circumferential gap between each engagement member 45 and the first rotary member side engagement portion 50 adjacent to the engagement member 45.

[0159] In this example, the second rotary member 43 configuring the clutch device 1b is disposed integrally with the output shaft 25 (refer to Figure 1 ) of the drive source 23 at the front end portion of the output shaft 25, or is connected to the front end portion of the output shaft 25 so as to be able to transmit torque. The third rotary member 44 configuring the clutch device 1b has a gear portion 26 (refer toFigure 1 Gear section 26 and gear section 27 provided at the base end of rotating shaft 24 (see reference) Figure 12 ) meshing.

[0160] In the clutch device 1b, when input is given to the second rotating component 43, for example... ​ When a clockwise torque is applied, the clockwise rearward engaging member 45 of the two engaging members 45 is forcefully wedge-shaped into the clockwise rearward end between the second rotating member side engaging part 51 and the third rotating member side engaging part 52. That is, the second rotating member side engaging part 51 and the clockwise rearward engaging member 45 engage with the second engaging part on the engaging member side, and the clockwise rearward engaging member 45 engaging part 17 and the third rotating member side engaging part 14 on the engaging member side, thereby transmitting torque between the second rotating member 43 and the third rotating member 44.

[0161] Therefore, when the second rotating component 43, the two engaging components 45, and the third rotating component 44 become a single unit and begin to rotate, the first engaging portion on the engaging component side of the clockwise-forward engaging component 45 engages with the first rotating component side engaging portion 50 on the clockwise-forward-forward-clockwise-direction. This results in a stable, forward-direction rotation state where the first rotating component 42 and the flywheel 6b are integrated with the second rotating component 43, the two engaging components 45, and the third rotating component 44.

[0162] In this example, under the aforementioned positive stable rotational state, when the traction of the drive wheel decreases or is lost, and then the traction of the drive wheel is restored, an impact torque is input from the drive wheel to the third rotating component 44 in the reverse direction, and the rotational speed of the third rotating component 4 and the two engaging parts 5 decreases sharply.

[0163] In contrast, the assembly of the first rotating component 42 and the flywheel 6b, due to its inertial force, wants to continue rotating at its original speed, rotating clockwise relative to the two engaging parts 5. As a result, due to the inertial rotational force of the assembly of the first rotating component 42 and the flywheel 6b, the clockwise rearward first rotating component side engaging part 50 presses circumferentially against the clockwise rearward engaging part 45 engaging part side first engaging part.

[0164] As a result, the rear-side engaging member 45 moves clockwise toward the circumferential center between the second rotating component-side engaging portion 51 and the third rotating component-side engaging portion 52, i.e., the portion with a wider gap between the second rotating component-side engaging portion 51 and the third rotating component-side engaging portion 52. This reduces or eliminates the contact pressure between the engaging member 45's third engaging portion and the third rotating component-side engaging portion 52. Consequently, a torque transmission limitation state is achieved, where the torque transmitted between the second rotating component 43 and the third rotating component 44 is reduced or eliminated.

[0165] As a result, it is possible to prevent the application of an impact torque from the drive wheel to the drive source 23. The other structures and effects of the fourth example are the same as those of the first example.

[0166] The reverse input cut clutch of the present disclosure can be implemented by appropriately combining the configurations of the first to fourth examples within a range where no contradiction arises.

[0167] Symbol explanation

[0168] 1, 1a, 1b - clutch device, 2, 2a - first rotary member, 3 - second rotary member, 4, 4a - third rotary member, 5 - engaging member, 6, 6a, 6b - flywheel, 7 - first rotary member side engaging portion, 8, 8a - first shaft portion, 9 - radially inner side surface, 10 - second rotary member side engaging portion, 11 - second shaft portion, 12 - large flat surface, 13 - small flat surface, 14 - third rotary member side engaging portion, 15 - engaging member side first engaging portion, 16 - engaging member side second engaging portion, 17 - engaging member side third engaging portion, 18 - radially inner side surface, 19 - flat surface portion, 20 - central recessed portion, 21 - guide recessed portion, 22 - urging member, 23, 23a - drive source, 24 - rotation shaft, 25, 25a - output shaft, 26 - gear portion, 27 - gear portion, 28 - power transmission mechanism, 29 - differential device, 30 - drive shaft, 31 - drive gear, 32 - intermediate shaft, 33 - intermediate gear, 34 - final reduction gear, 35 - differential case, 36 - ring gear, 37 - side gear, 38 - base end side shaft portion, 39 - front end side shaft portion, 40 - drive source, 41 - output shaft, 42 - first rotary member, 43 - second rotary member, 44 - third rotary member, 45 - engaging member, 46 - urging member, 47 - first shaft portion, 48 - first cylindrical portion, 49 - retaining hole, 50 - first rotary member side engaging portion, 51 - second rotary member side engaging portion, 52 - third rotary member side engaging portion, 53a, 53b - rolling bearing, 54 - drive wheel, 55 - radially outer side surface, 56 - side surface, 57 - pinion, 58 - support shaft.

Claims

1. A clutch device, characterized in that, have: The first rotating component has a first rotating component side engaging portion; The second rotating component has a second rotating component side engaging portion; The third rotating component has a third rotating component side engaging portion; The engaging member has a first engaging portion on the engaging member side capable of engaging with the engaging portion on the first rotating component side, a second engaging portion on the engaging member side capable of engaging with the engaging portion on the second rotating component side, and a third engaging portion on the engaging member side capable of engaging with the engaging portion on the third rotating component side; and The flywheel, which is fixed to the aforementioned first rotating component, When torque is input to the second or third rotating component, the engaging portion on the second rotating component side engages with the second engaging portion on the engaging member side, and the engaging portion on the third rotating component side engages with the third engaging portion on the engaging member side. This allows torque to be transmitted between the second and third rotating components while the first engaging portion on the engaging member side engages with the first rotating component side, resulting in a stable rotational state where the first rotating component, the flywheel, the second rotating component, the third rotating component, and the engaging member rotate as a unit. When the torque acting on the third rotating component increases sharply under the aforementioned stable rotational state, based on the inertial force acting on the flywheel, the engaging portion on the first rotating component side presses against the first engaging portion on the engaging member side. As a result, the engaging member causes the third engaging portion on the engaging member side to move away from the third rotating component side engaging portion. The contact pressure between the third engaging portion on the engaging member side and the third rotating component side engaging portion decreases or is lost, thereby creating a torque transmission restriction state where the torque transmitted between the second rotating component and the third rotating component is reduced or lost.

2. The clutch device according to claim 1, characterized in that, It has a force-applying component that elastically applies force to the engaging member in the direction of engaging the engaging portion on the third rotating member side and the engaging member side third engaging portion.

3. The clutch device according to claim 1 or 2, characterized in that, The aforementioned third rotating component has a third rotating component side engaging portion on its inner circumferential surface. The first rotating component side engagement portion is disposed radially inside the third rotating component side engagement portion. The second rotating component side engagement portion is positioned radially inward than the first rotating component side engagement portion. The aforementioned engaging member has a second engaging portion on the radially inner side and a third engaging portion on the radially outer side, and is configured to allow the third engaging portion on the engaging member side to move in a first direction relative to the third rotating member side engaging portion in a near-far direction.

4. The clutch device according to any one of claims 1 to 3, characterized in that, The aforementioned locking mechanism consists of two locking components. The aforementioned first rotating component side engaging portion is composed of two first rotating component side engaging portions.

5. The clutch device according to any one of claims 1 to 4, characterized in that, It is used in a drive system that transmits the torque of the drive source to the drive wheels.

Images