WO2019176026A1

WO2019176026A1 - Clutch device

Info

Publication number: WO2019176026A1
Application number: PCT/JP2018/010032
Authority: WO
Inventors: 栄弥大池; 忠彦加藤
Original assignee: 株式会社ユニバンス
Priority date: 2018-03-14
Filing date: 2018-03-14
Publication date: 2019-09-19
Also published as: JP6976413B2; JPWO2019176026A1

Abstract

Provided is a clutch device that is capable of reducing the elastic force of a compression spring. A clutch device (10) is provided with a first member (20) and a second member (50) that rotate about an axis, wherein a first hole (28) is formed in a first surface (21) of the first member (20), the first surface intersecting the axis. An engagement element (33) is disposed on a third surface (23) facing the second member (50) side of the first hole (28), the elastic force of a compression spring (34) is applied to a force point (35), and an end portion (37) moves with respect to a fulcrum (36) to the second member (50) side. A fourth surface (60) positioned on the radially outer side with respect to the engagement element (33) is provided with a contact portion (61) with which a lateral surface (39) of the engagement element (33) comes into contact during rotation of the first member (20). A gap is formed between the end portion (37) of the lateral surface (39) and the fourth surface (60) when the lateral surface (39) comes into contact with the contact portion (61).

Description

Clutch device

The present invention relates to a clutch device that switches between transmission and interruption of torque.

A first member having a first surface intersecting the axis and rotating about the axis; a second member having a second surface facing the first surface in the direction of the axis; and rotating about the axis; There is known a clutch device including an engagement element interposed between a first surface of a member and a second surface of a second member (Patent Documents 1 and 2). In the techniques disclosed in Patent Documents 1 and 2, the engagement element is disposed in the first hole formed in the first surface. The engagement element rises toward the second member centering on the fulcrum by the compression spring disposed inside the first hole. When the end of the engaging element engages with the second hole formed in the second surface of the second member, the first member and the second member rotate together. In order for the engagement element to rise, the compression spring needs a certain elastic force.

Japanese Patent No. 5145019 Japanese Patent No. 6209608

However, in the above-described conventional technique, when the first member and the second member rotate relative to each other, the end portions of the engaging elements are pressed against the second member by the elastic force of the compression spring and rub against each other. In order to reduce this friction, it is advantageous that the compression spring has a small elastic force. However, since the centrifugal force of the engagement element increases as the rotation speed of the first member increases, the compression spring needs a large elastic force to overcome the centrifugal force and raise the engagement element.

The present invention has been made to solve this problem, and an object of the present invention is to provide a clutch device capable of reducing the elastic force of the compression spring.

In order to achieve this object, the clutch device of the present invention switches between transmission and interruption of torque, and the first member that rotates about the axis forms a first hole on the first surface that intersects the axis. The second member that rotates about the axis has a second surface facing the first surface in the direction of the axis, and a second hole is formed in the second surface. The engaging element disposed on the third surface of the first hole facing the second member side is engaged with the second hole by applying the elastic force of the compression spring disposed inside the first hole to the force point. Is moved toward the second member around the fulcrum of the engagement element. A fourth surface that communicates with the first surface and the third surface of the first hole and is located on the outer side in the radial direction with respect to the engagement element is a side surface of the engagement element when the first member rotates. The contact part which contacts is provided. When the contact portion comes into contact with the side surface of the engagement element, there is a gap between the end portion of the side surface and the fourth surface.

According to the clutch device of the first aspect, when the first member rotates, a centrifugal force acts on the engagement element. When the first moment around the fulcrum due to the elastic force of the compression spring applied to the force point is greater than the second moment around the fulcrum due to the frictional force applied to the contact portion due to the centrifugal force of the engagement element, the compression spring causes the engagement element to move. Get up. When the contact portion and the side surface of the engaging element come into contact, there is a gap between the end portion of the side surface and the fourth surface, so compared to the case where the end portion of the side surface of the engaging element contacts the fourth surface, The distance from the fulcrum related to the second moment to the contact portion can be shortened. Since the second moment can be reduced accordingly, the elastic force of the compression spring can be reduced by balancing with the first moment.

According to the clutch device of the second aspect, the contact portion is in a range obtained by projecting from the fulcrum of the engagement element to the center of gravity of the engagement element on the fourth surface. As a result, the distance from the fulcrum related to the second moment to the contact portion compared to the case where the contact portion is in the range projected from the center of gravity of the engagement element to the end (but not including the center of gravity) on the fourth surface. Can be further shortened. Since the second moment can be further reduced, the elastic force of the compression spring can be further reduced.

In addition, compared with the case where the contact portion is in the range projected from the center of gravity of the engagement element to the end portion (but not including the center of gravity) on the fourth surface, It is easy to prevent contact with the four surfaces. When the end of the engagement element comes into contact with the fourth surface, the corners of the engagement element are easily worn, and the gravity center and mass of the engagement element change, and the moment balance changes with time. Since this can be prevented, the clutch device can be easily operated for a long period of time according to the initial design.

According to the clutch device of the third aspect, since the contact portion protrudes inward in the radial direction from the fourth surface, the contact portion is in contact with the case where the contact portion is provided by protruding a part of the side surface of the engagement element. Even if the portion is worn, the position and mass of the center of gravity of the engaging member can be prevented from changing. Since the moment balance can be prevented from changing even if the contact portion is worn, in addition to the effect of the first or second aspect, the clutch device can be easily operated for a long period of time according to the initial design.

It is sectional drawing of the clutch apparatus in 1st Embodiment. It is a rear view of the 2nd member. FIG. 3 is a cross-sectional view of the clutch device taken along line III-III in FIG. FIG. 4A is a cross-sectional view of the clutch device taken along line IVa-IVa in FIG. 3, and FIG. 4B is a front view of the first member and the engaging element, which are partially enlarged. (A) is sectional drawing of the 1st member and engagement child in the Va-Va line of Drawing 4 (b), (b) is a front view of the 1st member and engagement child of the clutch device in a 2nd embodiment. FIG. 5C is a cross-sectional view of the first member and the engagement member taken along the line Vc-Vc in FIG. (A) is the front view of the 1st member and engagement child which expanded a part of clutch device in a 3rd embodiment, and (b) is the 1st expanded part of the clutch device in a 4th embodiment. It is a front view of a member and an engagement child.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a schematic configuration of the clutch device 10 will be described with reference to FIG. FIG. 1 is a cross-sectional view including an axis O of the clutch device 10 according to the first embodiment. The clutch device 10 includes a first member 20 and a second member 50 that rotate about an axis O. In the present embodiment, the input shaft 11 and the output shaft 12 are disposed on the same axis O, the first member 20 is coupled to the input shaft 11, and the second member 50 is coupled to the output shaft 12.

The first member 20 is a member formed in a ring shape with the axis O as the center, and the first hole 22 is formed in the flat first surface 21 that intersects the axis O (in the present embodiment, orthogonal to the axis O). , 28 (see FIG. 3). The first surface 21 is opposed to the flat second surface 51 of the second member 50 in the axis O direction. In the

first holes

22 and 28, third surfaces 23 facing the second member 50 are formed. On the bottom surface 24 of the

first holes

22, 28 located farther from the second member 50 than the third surface 23, there is an oil hole 25 that opens to the end surface 26 on the opposite side of the first surface 21 of the first member 20. Is formed.

Engaging elements 30 and 33 (see FIG. 3) are arranged on the third surface 23 of the first holes 22 and 28 (see FIG. 3), and between the bottom surface 24 of the

first holes

22 and 28 and the

engaging elements

30 and 33. In addition, a compression spring 34 is arranged. The compression spring 34 biases the

engaging members

30 and 33 toward the second member 50 side. A retainer 40 that interferes with the

engaging elements

30 and 33 is disposed on the first surface 21 of the first member 20.

The second member 50 is a member formed in a ring shape with the axis O as the center, and the second hole 52 is formed in the flat second surface 51 that intersects the axis O (in the present embodiment, orthogonal to the axis O). A plurality of are formed. The 2nd hole 52 is a site | part which the engaging elements 30 and 33 (refer FIG. 3) arrange | positioned at the 1st member 20 engage.

FIG. 2 is a rear view of the second member 50. The second holes 52 are formed in the second member 50 at intervals in the circumferential direction. The second hole 52 has a substantially rectangular shape when viewed from the direction of the axis O. In the second member 50, a ring groove 53 that connects the second hole 52 in the circumferential direction is formed in the second surface 51. The second member 50 has a plurality of pin holes 54 communicating with the groove bottom of the ring groove 53.

Referring back to FIG. The pin hole 54 opens in the end surface 55 on the opposite side of the second surface 51 of the second member 50. A ring 56 is accommodated in the ring groove 53 (see FIG. 2), and a pin 57 is accommodated in the pin hole 54. The pin 57 transmits a force in the direction of the axis O of the actuator 59 to the ring 56 via an annular plate member 58 disposed around the output shaft 12. The actuator 59 moves the ring 56 in the direction of the axis O via the plate member 58 and the pin 57.

FIG. 3 is a cross-sectional view of the clutch device 10 taken along line III-III in FIG. The first member 20 has first holes 22 and 28 alternately arranged in the circumferential direction. The

first holes

22 and 28 are substantially rectangular when viewed from the direction of the axis O. In the present embodiment, the circumferential length of the first hole 28 is longer than the circumferential length of the first hole 22. In the first member 20, an arcuate groove 21 a that connects the

first holes

22 and 28 in the circumferential direction is formed on the first surface 21. The groove 21a is a recess into which the ring 56 disposed in the second member 50 (see FIG. 1) enters.

The first member 20 has recesses 27 formed on the first surface 21 extending from one end in the circumferential direction of the first hole 22 to both sides in the radial direction, and the diameter from the other end in the circumferential direction of the first hole 28. Concave portions 29 extending on both sides in the direction are formed on the first surface 21. In the present embodiment, the circumferential length of the recess 29 is longer than the circumferential length of the recess 27.

The engaging element 30 is disposed in the first hole 22, and the engaging element 33 is disposed in the first hole 28. Each of the

engagement elements

30 and 33 includes a rectangular plate-shaped column 31 and arms 32 that protrude from both ends of the column 31 in the width direction of the column 31. The

engaging elements

30 and 33 are the same components except that the circumferential directions arranged on the first member 20 are different.

The arms 32 of the

engagement elements

30 and 33 are accommodated in the

recesses

27 and 29. The struts 31 of the engaging

members

30 and 33 are disposed between the fourth surface 60 located on the radially outer side of the

first holes

22 and 28 and the fifth surface 62 facing the fourth surface 60 in the radial direction. Be placed. Since the circumferential lengths of the first hole 28 and the recess 29 are longer than the circumferential lengths of the support column 31 and the arm 32 of the engagement element 33, the engagement element 33 has the third surface 23 and the recess 29 of the first hole 28. Can slide in the circumferential direction.

The retainer 40 is a disk-shaped member, and a plurality of first arms 41 and second arms 42 extending radially are arranged alternately in the circumferential direction. The retainer 40 is biased in the first direction (arrow R direction) about the axis O by the restoring force of a compression spring (not shown) disposed on the first member 20. In a state where the retainer 40 is urged in the first direction (arrow R direction), the first arm 41 abuts on the circumferential end surface of the column 31 of the engaging element 33, and the second arm 42 is the column 31 of the engaging element 30. Cover a part of.

FIG. 4A is a sectional view of the clutch device 10 taken along the line IVa-IVa in FIG. FIG. 4A shows a state in which the second surface 51 of the second member 50 faces the first surface 21 of the first member 20 for ease of explanation.

The engagement element 33 has the support 31 disposed on the third surface 23 of the first hole 28. A compression spring 34 is disposed between the bottom surface 24 of the first hole 28 and the engagement element 33. In the present embodiment, the compression spring 34 is a torsion coil spring. The compression spring 34 applies an elastic force (restoring force) to a portion (power point 35) on the side opposite to the portion where the arm 32 (see FIG. 3) is provided in the support 31 of the engagement element 33. The first arm 41 of the retainer 40 (see FIG. 3) is pressed against the end surface of the support 31 on the arm 32 side of the engagement element 33, and the arm 32 of the engagement element 33 is pressed against the second surface 51 of the second member 50. Therefore, the engaging element 33 in which the elastic force of the compression spring 34 is applied to the force point 35 can move the end portion 37 toward the second member 50 with the fulcrum 36 of the support 31 as the center.

When the position of the first hole 28 of the first member 20 and the position of the second hole 52 of the second member 50 are shifted, the ring 56 disposed in the second member 50 enters the second hole 52. In the case where the engaging member 33 receives the elastic force of the compression spring 34, the end portion 37 of the engaging member 33 contacts the second surface 51 or the ring 56 of the second member 50. When the ring 56 retreats from the second hole 52 and the ring 56 does not contact the end portion 37 of the engagement element 33, the end portion 37 of the engagement element 33 can enter the second hole 52. On the other hand, the engaging element 30 cannot enter the second hole 52 because the second arm 42 of the retainer 40 is partially covered with the support 31. In this state, when the first member 20 rotates relative to the second member 50 in the first direction (arrow R direction), the end portion 37 of the engagement element 33 engages with the second hole 52, and the first member. 20 and the second member 50 rotate together.

When the engagement element 33 rotates together with the first member 20 and the second member 50, the first arm 41 is pushed by the engagement element 33, and the retainer 40 rotates in the second direction (counter arrow R direction). Since the second arm 42 (see FIG. 3) of the retainer 40 cannot cover the engagement element 30, the engagement element 30 rises toward the second member 50 side by the elastic force of the compression spring 34. Since the second hole 52 of the second member 50 is formed at a position where the engaging element 30 raised to the second member 50 side can enter, the engaging element 30 also engages with the second hole 52 of the second member 50. .

On the other hand, when the first member 20 rotates relative to the second member 50 in the second direction (counter arrow R direction) while the retainer 40 prevents the engagement element 30 from rising, the engagement element 33 is The hole 52 cannot be engaged. At this time, the engaging element 33 swings around the fulcrum 36 while the end 37 rubs the second surface 51 of the second member 50. This is the friction when the first member 20 rotates relative to the second member 50 in the second direction (counter arrow R direction). It is desirable that this friction be as small as possible.

FIG. 4B is a front view of the first member 20 and the engagement element 33, which are partially enlarged. FIG. 4B shows a state in which the first member 20 is rotated, and the engagement force of the engaging member 33 moves in the first hole 28 to the outside in the radial direction (upper side in FIG. 4B). It is illustrated (the same applies to FIGS. 5 (b), 6 (a) and 6 (b)). In addition, since the 1st hole 22 of the 1st member 20 is also comprised similarly to the 1st hole 28, hereafter, the 1st hole 28 is demonstrated and description of the 1st hole 22 is abbreviate | omitted.

In the engagement element 33, the base 31a of the arm 32 (the part closer to the end 37 than the arm 32) of the support 31 is set to have a narrow width between the side surfaces 39. Of the first hole 28 formed in the first member 20, the fourth surface 60 positioned radially outward with respect to the support 31 of the engaging element 33 is the first surface 21 (see FIG. 4A) and the first surface 21. Contact 3 side 23. The fourth surface 60 is formed with a contact portion 61 that contacts the side surface 39 of the engagement element 33 when the first member 20 rotates. The contact portion 61 is a portion where the convex portion 63 protruding from the portion of the fourth surface 60 close to the concave portion 29 toward the inside in the radial direction (the lower side in FIG. 4B) and the side surface 39 of the engaging element 33 come into contact. It is. When the engagement element 33 contacts the contact portion 61, the engagement element 33 does not contact the fifth surface 62 that faces the fourth surface 60.

FIG. 5 (a) is a cross-sectional view of the clutch device 10 taken along the line Va-Va of FIG. 4 (b). The contact portion 61 is provided perpendicular to the third surface 23. In the contact portion 61, the side surface 39 of the engaging element 33 (support 31) is in contact with the entire length in the thickness direction (the vertical direction in FIG. 5A) except for the roundness attached to the corner of the support 31.

Referring back to FIG. The contact portion 61 is in a range in which the fulcrum 36 to the end portion 37 of the engagement element 33 are projected on the fourth surface 60 (including the recess 29) perpendicular to the axis O. When the side surface 39 of the engagement element 33 comes into contact with the contact portion 61, there is a gap between the end portion 37 of the side surface 39 of the engagement element 33 and the fourth surface 60. Further, there is a gap between the convex portion 63 provided on the fourth surface 60 and the base 31a of the engaging element 33, and there is no contact between them, so that the contacting part 61 extends from the fulcrum 36 of the engaging element 33 to the center of gravity 38. Is projected onto the fourth surface 60 (including the recess 29) perpendicular to the axis O. Further, the contact portion 61 is in a range in which the fulcrum 36 to the force point 35 of the engagement element 33 are projected on the fourth surface 60 (including the recess 29) perpendicular to the axis O.

The range in which the engagement element 33 is projected onto the fourth surface 60 (including the recess 29) refers to a plane passing through the fulcrum 36 of the engagement element 33 and parallel to the axis O and the fourth surface 60 (including the recess 29). A range from a crossing point to a point where a plane passing through the end portion 37 of the engagement element 33 and parallel to the axis O intersects the fourth surface 60. Further, the range from the fulcrum 36 of the engagement element 33 to the center of gravity 38 projected onto the fourth surface 60 is a plane passing through the fulcrum 36 of the engagement element 33 and parallel to the axis O and the fourth surface 60 (including the recess 29). Is a range from a point where the fourth surface 60 intersects the plane passing through the center of gravity 38 of the engagement element 33 and parallel to the axis O.

Here, when the first member 20 rotates about the axis O, a centrifugal force acts on the engagement element 33. The centrifugal force Fc of the engagement element 33 is Fc = mrω ² in the case of the mass m of the engagement element 33, the radius r from the center of gravity 38 of the engagement element 33 to the axis O, and the angular velocity ω of the first member 20. The frictional force Ff of the contact portion 61 due to the centrifugal force Fc is Ff = Fc · μ when the static friction coefficient μ.

In this embodiment, the relationship between the distance D1 in the circumferential direction from the fulcrum 36 to the center of the contact portion 61 and the distance D2 in the circumferential direction from the fulcrum 36 to the force point 35 is D2> D1. The position of the force point 35 is a position where a spring load is applied to the column 31 when the end portion 37 of the engagement element 33 contacts the third surface 23 (the swing angle of the engagement element 33 is 0 °). The distance D2 from the force point 35 to the fulcrum 36 when the end portion 37 of the engagement element 33 contacts the third surface 23 is such that the end portion 37 of the engagement element 33 contacts the second surface 51 by the elastic force of the compression spring 34. Is the same as the distance D2 from the force point 35 to the fulcrum 36 at the time (oscillation angle 0 ° + α).

The first moment D2 · P around the fulcrum 36 due to the elastic force P of the compression spring 34 applied to the force point 35 is the second moment around the fulcrum 36 due to the frictional force Ff applied to the contact portion 61 due to the centrifugal force Fc of the engagement element 33. When larger than D1 · Ff (= D1 · Fc · μ), the compression spring 34 raises the engaging element 33. As the angular velocity ω of the first member 20 increases and the centrifugal force Fc increases, the compression spring 34 that raises the engaging element 33 requires a larger elastic force P. When the elastic force P of the compression spring 34 increases, the friction when the first member 20 rotates while the engaging member 33 rubs the second member 50 increases. Further, when the elastic force P of the compression spring 34 is increased, the actuator 59 for driving the ring 56 for retracting the engaging member 33 engaged with the second hole 52 of the second member 50 from the second hole 52 has a large output. Is required.

In contrast, in the clutch device 10, when the side surface 39 of the engagement element 33 comes into contact with the contact portion 61, a gap is formed between the end portion 37 of the side surface 39 of the engagement element 33 and the fourth surface 60. As a result, the distance D1 from the fulcrum 36 to the contact portion 61 is shorter than when the end portion 37 of the side surface 39 of the engagement element 33 contacts the fourth surface 60 when the first member 20 rotates at the angular velocity ω. it can. Since the second moment D1 · Ff can be reduced accordingly, the elastic force P of the compression spring 34 can be reduced by the balance between the first moment D2 · P and the second moment. Therefore, the friction of the clutch device 10 when the first member 20 rotates while the end portion 37 of the engagement element 33 rubs against the second surface 51 of the second member 50 can be suppressed. Further, an actuator 59 with a small output can be employed.

In the present embodiment, the contact portion 61 is in a range in which the portion from the fulcrum 36 to the center of gravity 38 of the engagement element 33 is projected onto the fourth surface 60 (including the recess 29). As a result, the contact portion 61 is from the fulcrum 36 to the contact portion 61 as compared with the case where the contact portion 61 is in a range in which the center of gravity 38 to the end portion 37 (but not including the center of gravity 38) of the engaging element 33 is projected onto the fourth surface 60. The distance D1 can be further shortened. Since the second moment D1 · Ff can be further reduced, the elastic force of the compression spring 34 can be further reduced.

Further, the rotation of the engaging element 33 around the center of gravity 38 (compared to the case where the contact portion is in the range projected from the center of gravity 38 to the end 37 of the engaging element 33 (but not including the center of gravity 38) on the fourth surface 60) It is possible to easily prevent contact between the end portion 37 of the engagement element 33 and the fourth surface 60 according to FIG. When the end portion 37 of the engagement element 33 comes into contact with the fourth surface 60, the corners of the side surface 39 of the engagement element 33 are easily worn, so the center of gravity 38 and the mass of the engagement element 33 change, and the moment balance changes over time. Will change. Since this can be prevented, the clutch device 10 can be easily operated for a long period of time according to the initial design.

Particularly, since the contact portion 61 is at a position where the center of gravity 38 of the engagement element 33 is projected onto the fourth surface 60, the moment in the third surface 23 (FIG. 4 (b) clockwise moment) can be almost ignored. Therefore, the elastic force P of the compression spring 34 can be further reduced by the balance between the second moment D1 · Ff and the first moment D2 · P.

Further, the contact portion 61 is in a range in which the fulcrum 36 to the force point 35 of the engagement element 33 are projected on the fourth surface 60. As a result, the contact portion 61 is from the fulcrum 36 to the contact portion 61 as compared with the case where the contact portion 61 is in the range where the force point 35 to the end portion 37 (but not including the force point 35) of the engagement element 33 is projected onto the fourth surface 60. The distance D1 can be shortened. Since the second moment D1 · Ff can be reduced by that much, the elastic force P of the compression spring 34 can be further reduced by the balance between the second moment D1 · Ff and the first moment D2 · P.

The side surface 39 of the engagement element 33 (support 31) is in contact with the contact portion 61 over the entire length in the thickness direction (the vertical direction in FIG. 5A), except for the roundness attached to the corner of the support 31. . Thereby, compared with the case where a part of the side surface 39 of the engaging element 33 in the thickness direction is in contact with the contact portion 61, the surface pressure can be suppressed, so that the engaging member 33 and the contacting portion 61 are hardly worn.

Since the contact portion 61 is provided perpendicular to the third surface 23, a part of the column 31 comes into contact with the contact portion 61 even when the engaging element 33 is raised. Thereby, the contact portion 61 can regulate the radial position of the engagement element 33 when the engagement element 33 is raised.

Since the contact portion 61 protrudes inward in the radial direction from the fourth surface 60 by the convex portion 63, the contact portion 61 is in contact with the contact portion 61 compared with the case where the contact portion 61 is provided by protruding a part of the side surface 39 of the engagement element 33. Even if the portion 61 is worn, the center of gravity 38 and the mass of the engaging element 33 can be prevented from changing. Since the moment balance can be kept unchanged even if the contact portion 61 is worn, the clutch device 10 can be easily operated for a long period of time according to the initial design.

Since the engagement element 33 has a narrow width at the base 31a of the support 31, the first hole 28 or the recess 29 and the support 31 can be prevented from rubbing when the engagement 33 swings. Further, the convex portion 63 is connected to the edge of the concave portion 29 in the fourth surface 60, and the contact portion 61 is formed on a part of the convex portion 63 by overlapping the base 31 a with the convex portion 63. The processing of the fourth surface 60 for forming can be facilitated.

The second embodiment will be described with reference to FIGS. 5 (b) and 5 (c). In the first embodiment, the case where the contact portion 61 is provided vertically on the third surface 23 has been described. On the other hand, 2nd Embodiment demonstrates the case where the 3rd surface 23 and the contact part 73 make an obtuse angle. In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

FIG. 5B is a front view of the first member 70 and the engaging member 74 of the clutch device according to the second embodiment. FIG. 5C is a cross-sectional view of the first member 70 and the engagement element 74 taken along the line Vc-Vc in FIG. The first member 70 and the engaging element 74 are arranged in place of the first member 20 and the engaging element 33 of the clutch device 10 described in the first embodiment.

As shown in FIG. 5 (b), the first member 70 has a contact portion 73 on the fourth surface 72 that contacts a part of the side surface 76 of the engaging element 74 when the first member 70 rotates. As shown in FIG. 5C, the contact portion 73 spreads radially outward (right side in FIG. 5C) as it approaches the first surface 21 from the third surface 23. That is, the third surface 23 and the contact portion 73 form an obtuse angle. The contact portion 73 is in contact with the side surface 76 of the engaging element 74 (the support column 75) over the entire length in the thickness direction (vertical direction in FIG. 5C) except for the roundness attached to the corner of the support column 75.

The third surface 23 of the first member 70 and the contact portion 71 form an obtuse angle, and the side surface 76 of the engaging member 74 contacts the contact portion 73 when the first member 70 rotates. The vertical component force due to the centrifugal force Fc of the engaging member 74 applied to the contact portion 73 can be reduced by the amount that the contact portion 73 is inclined. As a result, since the second moments D1 and Ff due to the frictional force Ff applied to the contact portion 73 can be reduced, the elastic force P of the compression spring 34 is further increased by the balance between the second moments D1 and Ff and the first moments D2 and P. Can be small.

As shown in FIG. 5 (b), of the

recesses

78 and 79 in which the arms 77 of the engaging element 74 are accommodated, the radially inner surface of the radially outer recess 78 is the radial direction of the arm 77. Contact side surface 77a. The portion of the inner surface in the radial direction of the recess 78 that contacts the side surface 77a of the arm 77 is a contact portion 78a. Further, the inner surface in the circumferential direction of the concave portion 79 in the radial direction contacts the outer surface 77 b in the circumferential direction of the arm 77.

When the engaging element 74 is raised, a part of the support column 75 of the engaging element 74 does not contact the contact portion 73. However, a part of the contact portion 78 a on the radially inner surface of the recess 78 contacts the radial side surface 77 a of the arm 77, and the circumferential inner surface of the recess 79 is in the circumferential direction of the arm 77. In contact with the surface 77b. Thereby, the position of the engagement element 74 in the radial direction when the engagement element 74 is raised can be regulated. Since the position of the arm 77 is short from the fulcrum 36, the friction between the side surface 77 a and the surface 77 b of the arm 77 and the recesses 78 (contact portions 78 a) and 79 when the engaging member 74 swings around the fulcrum 36. The moment according to is hardly a problem. Therefore, the elastic force of the compression spring 34 can be reduced.

A third embodiment will be described with reference to FIG. 1st Embodiment and 2nd Embodiment demonstrated the case where the

contact parts

61 and 73 were provided in the 4th surfaces 60 and 72 1 each. In contrast, in the third embodiment, a case where a plurality of

contact portions

61 and 83 are provided on the fourth surface 82 will be described. In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

FIG. 6A is a front view of the first member 80 and the engagement element 33 in which a part of the clutch device according to the third embodiment is enlarged. The first member 80 is different from the first member 20 of the clutch device 10 described in the first embodiment in the shape of the first hole 81. The first member 80 is disposed in place of the first member 20 of the clutch device 10 described in the first embodiment.

Among the first holes 81 formed in the first member 80, the fourth surface 82 located radially outside the support column 31 of the engagement element 33 rotates the first member 80 in addition to the contact portion 61. A contact portion 83 is sometimes formed with which a part of the side surface 39 of the engagement element 33 contacts. The contact portion 83 protrudes from the fourth surface 82 toward the radially inner side (the lower side in FIG. 6A).

The contact portion 83 is in a range in which the fulcrum 36 to the end portion 37 of the engagement element 33 are projected onto the fourth surface 82 (including the recess 29) perpendicular to the axis O, and the side surface 39 of the engagement element 33 is the contact portion 61, When contacted with 83, a gap is formed between the end portion 37 of the side surface 39 of the engagement element 33 and the fourth surface 82. Further, the contact portion 83 is in a range in which the fulcrum 36 to the force point 35 of the engagement element 33 are projected on the fourth surface 82 (including the recess 29) perpendicular to the axis O. Since there are a plurality of

contact portions

61 and 83, each contact pressure can be suppressed, and the engagement element 33 and the

contact portions

61 and 83 can be hardly worn.

The fourth embodiment will be described with reference to FIG. In the first to third embodiments, the case where the contact portions are formed by projecting part of the

fourth surfaces

60 and 82 of the

first holes

22, 28 and 81 has been described. In contrast, in the fourth embodiment, a case will be described in which a part of the engaging element 93 is protruded to form the contact portion 97 on the fourth surface 92. FIG. 6B is a front view of the first member 90 and the engagement element 93 in which a part of the clutch device according to the fourth embodiment is enlarged. The first member 90 and the engagement element 93 are arranged in place of the first member 20 and the engagement element 33 of the clutch device 10 described in the first embodiment.

The engaging element 93 is disposed between the fourth surface 92 and the fifth surface 62 of the first hole 91 formed in the first member 90. The fourth surface 92 is located on the outer side in the radial direction with respect to the support column 94 of the engagement element 93. The engaging element 93 has a protruding portion 96 protruding from a part of the side surface 95 of the support post 94. The convex portion 96 is provided over the entire length of the column 94 in the thickness direction (FIG. 6B, the direction perpendicular to the paper surface). The convex portion 96 contacts the fourth surface 92 when the first member 90 rotates. A portion of the fourth surface 92 that contacts the convex portion 96 is a contact portion 97.

The contact portion 97 is in a range where a portion from the fulcrum 36 to the end portion 37 of the engagement element 93 is projected onto the fourth surface 92 (including the recess 29) perpendicular to the axis O, and the side surface 95 of the engagement element 93 is in contact with the contact portion 97. When contacted, a gap is formed between the end portion 37 of the side surface 95 of the engagement element 93 and the fourth surface 92. In particular, the contact portion 97 is within a range in which the portion from the fulcrum 36 to the center of gravity 38 of the engaging element 93 is projected onto the fourth surface 92 (including the recess 29) perpendicular to the axis O. Further, the contact portion 97 is in a range in which the fulcrum 36 to the force point 35 of the engagement element 93 are projected on the fourth surface 92 (including the recess 29) perpendicular to the axis O. Thereby, the same operation effect as 1st Embodiment can be implement | achieved except the gravity center 38 and mass of the engaging element 93 changing if the convex part 96 wears.

The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the number and shape of the

engagement elements

30, 33, 74, and 93 and the number of the second holes 52 with which the engagement elements are engaged are examples, and can be set as appropriate. The positions and sizes of the

contact portions

61, 73, 78a, 83, and 97 are also examples, and can be set as appropriate.
In the embodiment, the case has been described in which the base 31a of the arm 32 of the

engagement element

30, 33, 74, 93 is narrower than the width of the other part of the

support pillars

31, 75, 94. However, the present invention is not necessarily limited thereto. . Of course, it is possible to make the widths of the

columns

31, 75 and 94 constant by omitting the base 31a.

In the embodiment, the case where the convex portion 63 is continuous with the edge of the

concave portion

29, 78 of the

fourth surfaces

60, 72, 82 has been described, but the present invention is not necessarily limited thereto. The convex portion 63 is arbitrarily located at any position within a range in which the fulcrum 36 to the end portion 37 of the

engaging elements

30, 33, 74 are projected on the

fourth surfaces

60, 72, 82 among the

fourth surfaces

60, 72, 82. It is possible to provide with the magnitude | size.

In the embodiment, the case where the

first member

20, 70, 80, 90 is coupled to the input shaft 11 and the second member 50 is coupled to the output shaft 12 has been described, but the present invention is not necessarily limited thereto. On the contrary, it is naturally possible that the first member is coupled to the output shaft 12 and the second member is coupled to the input shaft 11. Moreover, although the case where the 1st member was integrally formed was demonstrated, it is not necessarily restricted to this, Of course, it is possible to divide | segment the 1st member into multiple in the axis line O direction.

In the embodiment, when the input shaft 11 and the output shaft 12 are coupled to the centers of the

first member

20, 70, 80, 90 and the second member 50, that is, the axis O of the first member and the second member and the input shaft Although the case where the output axis coincides has been described, the present invention is not necessarily limited to this. For example, the first member or the second member supported by the shaft is provided with a tooth profile on the outer peripheral surface, and the first member that rotates around the shaft by meshing the tooth profile with a gear provided on the input shaft or the output shaft, It is naturally possible to transmit torque to the second member.

In the embodiment, the case where a torsion coil spring is used as the compression spring 34 has been described, but the present invention is not necessarily limited thereto. Of course, other compression springs such as a compression coil spring can be used instead of the torsion coil spring.

In the embodiment, the case of the clutch device 10 in which the

engagement members

30 and 33 are arranged on the

first members

20, 70, 80, and 90 to form a two-way clutch has been described, but the present invention is not necessarily limited thereto. Of course, it is possible to omit one of the

engagement elements

30 and 33 and to make the clutch device a one-way clutch that transmits rotation in one direction.

In the embodiment, the case where the retainer 40 that restricts the swing of the engagement element 30 is disposed on the first member 20 has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to omit the retainer 40. . When the retainer 40 is omitted, the circumferential length of the first hole 28 is shortened so that the engagement element 33 cannot slide in the first hole 28. When the retainer 40 is omitted, the engagement element 33 swings around the corner of the first hole 28 as a fulcrum 36.

In the embodiment, the case where the

engagement elements

30 and 33 are pressed in the direction of the axis O via the ring 56 has been described, but the present invention is not necessarily limited thereto. It is naturally possible to press the engaging

members

30 and 33 in the direction of the axis O via the pin 57 by omitting the ring 56 and changing the tip shape of the pin 57 and the shapes of the engaging

members

30 and 33. Of course, the ring 56, the pin 57, the actuator 59, and the like may be omitted depending on the type of the clutch device.

In the embodiment, the case where the

engagement elements

30 and 33 have the same shape has been described, but the present invention is not necessarily limited thereto. Naturally, the lengths, widths, and thicknesses of the

engaging elements

30 and 33 can be different from each other.

DESCRIPTION OF SYMBOLS 10

Clutch apparatus

20,70,80,90 1st member 21

1st surface

22,28,81,91 1st hole 23

3rd surface

30,33,74,93 Engagement element 34 Compression spring 35 Power point 36 Support point 37 End part 38 Center of

gravity

39, 76, 77a, 95 Side surface 50 Second member 51 Second surface 52

Second hole

60, 72, 82, 92

Fourth surface

61, 73, 78a, 83, 97 Contact portion O Axis

Claims

A clutch device that switches between transmission and interruption of torque,
A first member having a first hole formed on a first surface intersecting an axis and rotating about the axis;
A second member having a second surface facing the first surface in the direction of the axis, wherein a second hole is formed in the second surface and rotates about the axis;
An engagement element disposed on a third surface facing the second member of the first hole;
It is disposed inside the first hole, applies an elastic force to the force point of the engaging element, and the end of the engaging element that engages with the second hole moves toward the second member with the fulcrum of the engaging element as a center. A compression spring that moves,
A fourth surface that communicates with the first surface and the third surface of the first hole, and is located on a radially outer side with respect to the engagement element, and is rotated when the first member rotates. A contact portion that contacts a side surface of the engagement element;
A clutch device in which there is a gap between the end of the side surface and the fourth surface when the contact portion and the side surface of the engaging element come into contact with each other.
2. The clutch device according to claim 1, wherein the contact portion is in a range in which the center of gravity of the engagement element to the fulcrum is projected onto the fourth surface.
The clutch device according to claim 1 or 2, wherein the contact portion protrudes radially inward from the fourth surface.