JP2000170798A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch in which the structure is simple, the rotating inertial mass is small, the restriction shock can be relaxed, and a small size and a light weight can be realized. SOLUTION: A connection member 13 has a plate form of elastic transforming part 133 whose base end is held by a clutch inner 11, and extended in one side in the peripheral direction, and in one side in the diameter direction, and the elastic transforming part 133 is squeezed to the inner peripheral surface of a clutch outer 12, that is, to a claw part 17, by its own arrow form bending elastic deformation. The claw part 17 has a loose inclination of sliding surface 15 at one side in the peripheral direction, and a sharp inclination of locking surface 16 at the other side in the peripheral direction, and the front end of the elastic deformation part 133 slides on the sliding surface 15 with a loose inclination in the relative rotation in one direction to the clutch outer 12, while it is locked on the locking surface 16 with a sharp inclination in the relative rotation in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a one-way clutch, that is, a one-way clutch.

[0002]

2. Description of the Related Art Generally, a generator of an internal combustion engine is driven by a belt. This belt is driven by a large torque fluctuation due to a periodic rotation fluctuation of the internal combustion engine and a rotation fluctuation due to a change in running conditions, so that there is a problem that the belt life is shortened. The one-way clutch is disengaged during the deceleration fluctuation period of the internal combustion engine to reduce the rotation fluctuation of the generator.

As a one-way clutch, a roller system (for example, see Japanese Patent Application Laid-Open No. 9-196090) and a sprag system are known. These are composed of connecting members such as rollers and sprags which can be independently displaced from both the clutch outer and the clutch inner, as well as springs and retainers, and the base ends of these connecting members are clutched by the springs supported by the clutch inner. It is pressed between the outer and the clutch inner, and has a mechanism for interrupting torque transmission when the clutch inner exceeds the rotational speed of the clutch outer.

[0004]

However, the above-mentioned conventional one-way clutch has the following problems. -One of the two rotors needs to hold the connecting member so that it can be relatively displaced (particularly in the radial direction), and further needs to hold a spring for biasing the connecting member, so that the structure is complicated and the rotary inertia mass is large. turn into.

[0005] In a roller type or sprag type one-way clutch having excellent durability, it is necessary to improve the shape accuracy of a sliding portion in order to improve the rotation restraining accuracy, and requires a high level of processing technology. The restraining impact is large after the rotation (dissociation) state to the restraining (coupling) state, and in order to withstand the restraining impact, it is necessary to strengthen the material of the connecting portion and increase the size of the shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a one-way clutch which has a simple structure, a small rotational inertia mass, can reduce restraint impact, and can be easily reduced in size and weight. For that purpose.

[0007]

In the following, a connecting member is held on the outer peripheral surface of the clutch inner so as not to be displaceable in the circumferential direction, and a claw portion which can be locked at the tip of the connecting member is provided on the inner peripheral surface of the clutch outer. The structure of the one-way clutch of the present invention will be described with an example of the above structure. Of course, the connection member may be held by the clutch outer, and the claw portion may be provided on the clutch inner.

According to the one-way clutch of the first aspect, the connecting member has a plate-shaped elastically deforming portion whose base end is held by the clutch inner and extends to one side in the circumferential direction and one side in the radial direction. The elastically deforming portion is pressed against the inner peripheral surface of the clutch outer, that is, the claw portion by its own elastic deformation. The claw portion has a gently inclined sliding contact surface on one side in the circumferential direction and a steeply inclined locking surface on the other side in the circumferential direction, whereby the tip of the elastically deforming portion is moved relative to the clutch outer in one direction. During rotation, it slides on the gently inclined sliding contact surface, and is engaged with the steeply inclined engagement surface during relative rotation in the opposite direction.

That is, according to this configuration, the distal end portion of the elastically deforming portion of the connecting member is displaced at least in the radial direction by its own curved elastic deformation during relative rotation in one direction, thereby allowing relative rotation between the two rotors. Therefore, the base end of the elastically deformable portion can be fixed to the clutch inner, so that the clutch inner can easily hold the connecting member, and no sliding resistance occurs between the clutch inner and the connecting member.

Further, the elastically deformable portion of the connecting member itself is elastically deformed in the radial direction, thereby obtaining the radial displacement of the distal end portion and the pressing force against the clutch outer during the relative rotation. This eliminates the need for a connecting member and a separate spring member as in the related art, and eliminates the need to provide a holding mechanism for the spring member in the clutch inner.

After all, according to this configuration, it is possible to realize a one-way clutch which has a simple structure, a small rotational inertia mass, and can be easily reduced in size and weight. According to the configuration of the second aspect, in the one-way clutch of the first aspect, the elastically deformable portion of the connecting member is in a posture in which the width direction is substantially axial from the base end portion fixed to the outer peripheral surface of the clutch inner. It is extended toward one side in the circumferential direction and one side in the radial direction,
Further, it is curved in a bow shape in a posture in which elastic deformation in the radial direction is easier than elastic deformation in the circumferential direction.

With this configuration, the elastically deformable portion smoothly elastically deforms by following the change in the radial position of each of the gently inclined sliding contact surfaces of the claw portion with the base end of the elastically deformable portion as a fulcrum during relative rotation. Between the base end portion, which is deeply elastically deformed in an arcuate shape at the time of restraining (coupling) and is held by the clutch inner, and the tip end portion which is locked to the steeply locking surface of the claw portion. Can be reduced while restraining (coupling) impact.

According to the third aspect of the present invention, in the one-way clutch according to the second aspect, the one-way clutch is used for transmitting the torque from the periodic torque generator in one direction. According to this configuration, the degree of bowing of the elastically deformable portion changes in accordance with the increase or decrease in the periodic fluctuation torque, and the change in the periodic fluctuation torque can be absorbed. Therefore, the change in the transmission torque can be further reduced as compared with disengaging and connecting the one-way clutch.

According to a fourth aspect of the present invention, in the one-way clutch according to the second aspect, the shock absorbing member is further provided at least in the vicinity of the base of the claw portion, particularly in the vicinity of the claw portion of the gently inclined sliding contact surface. According to this configuration, it is possible to reduce the impact when the tip of the elastically deformable portion of the connecting member falls from the top of the claw to the portion near the claw of the gently inclined sliding contact surface, thereby reducing the contact noise. .

According to a fifth aspect of the present invention, in the one-way clutch according to the fourth aspect, an O-ring is further used as the shock absorbing member. In this way, the shock-absorbing member can be provided in the vicinity of each claw portion at a time with one member, and the holding by the clutch outer can be facilitated by providing, for example, a ring-shaped groove. Claim 6
According to the configuration, in the one-way clutch according to any one of claims 1 to 5, the connecting member further includes a support plate portion having a substantially circular arc shape which is locked to the clutch inner and having a predetermined width in the axial direction from one end in the circumferential direction. To form a shape cut and raised by a predetermined distance in the circumferential direction. This makes it easy to manufacture the connecting member and fix it to the clutch inner.

According to a seventh aspect of the present invention, in the one-way clutch according to the sixth aspect, the connecting member is further separated from the substantially cylindrical support plate portion which is engaged with the outer peripheral surface of the clutch inner by a predetermined pitch in the circumferential direction. It is formed in a shape that is cut and raised by a predetermined width in the axial direction with a predetermined width in the axial direction. This makes it easy to manufacture the connecting member and fix it to the clutch inner.

According to an eighth aspect of the present invention, the one-way clutch according to any one of the first to seventh aspects further comprises:
The distal end of the elastically deformable portion is curved with a larger curvature than the body of the elastically deformable portion so as to be able to be locked on the steeply inclined locking surface. With this configuration, the distal end portion can be satisfactorily locked on the steep locking surface.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the one-way clutch of the present invention will be described with reference to the following embodiments.

[0019]

Embodiment 1 One embodiment of a one-way clutch of the present invention will be described below with reference to FIG. FIG. 1 shows a radial cross-sectional view of the one-way clutch, FIG. 2 shows an axial cross-sectional view of a pulley device using the one-way clutch, and FIG. 2 shows a partial axial cross-sectional view of a vehicle alternator equipped with the pulley device. FIG. 3 is a front view of the clutch inner 11 viewed from the radial direction, and FIG. 4A is a half sectional view of the clutch inner 11 viewed from the axial direction.

The one-way clutch 1 has a clutch inner 11 and a clutch outer 12 which are arranged concentrically at a predetermined interval in the circumferential direction.
And a O-ring 14 held on the inner peripheral surface of the clutch outer 12. The spacer 2 is press-fitted into the clutch inner 11, and the clutch outer 12 is press-fitted into the axial center of the pulley 3. The pulley 3 is located on both sides of the one-way clutch 1 in the axial direction.
The bearing is rotatably supported.

The inner circumferential surface of the clutch outer 12 has a gently inclined sliding contact surface 15 on one side in the circumferential direction and a steeply engaging locking surface 16 on the other side in the circumferential direction. It has a claw 17 projecting inward. . Clutch inner 11
The locking projections 18 are provided on the outer peripheral surface at the same pitch as the claw portions 17 of the clutch outer 12.
The connecting members 13 are respectively supported on 9.

The connecting member 13 is made of a plate made of an elastic metal such as phosphor bronze, and is formed in the groove 19 along the outer peripheral surface of the clutch inner 11.
A locking plate 132 is provided at one end in the circumferential direction of the support plate 131 and is locked by the locking projection 18. The locking plate portion 132 is formed by cutting the central portion in the axial direction of the support plate portion 131 from one circumferential edge of the support plate portion 131 along a pair of cut lines extending in the circumferential direction at a predetermined axial distance from each other. , And have a shape curved outward in a radial direction.
As a result, the locking plate portion 132 comes into contact with the three side surfaces of the locking projection 18 and can be stably locked to the locking projection 18.

The locking plate 132 is locked to the locking projection 18 to prevent the rotation of the connecting member 13 during locking (when restrained), and the edge of the support plate 131 opposite to the locking plate 132. Is locked to the opposite end of the locking projection 18 to prevent the connection member 13 from rotating when the overrun occurs.
The connecting member 13 has a plate-shaped elastic deformation portion 133 that curves in an arc shape outward in a radial direction while moving away from the locking plate portion 132 of the support plate portion 131 in the vicinity of the locking plate portion 132. 133 presses its front end against the inner peripheral surface of the clutch outer 12 by its own elastic deformation.

The elastically deforming portion 133 is provided at a central portion in the axial direction of the support plate portion 131 along a pair of cut lines extending in the circumferential direction at a predetermined axial distance from each other and on the opposite side to the locking plate portion 132 in the circumferential direction. After cutting from the edge, it has a shape that is curved radially outward. The tip of the elastic deformation portion 133 is
As shown in FIG. 1, the elastically deformable portion 133 is bent radially inward with a curvature larger than that of the main portion, and is easily locked to the steeply inclined locking surface 16 of the claw portion 17.

As shown in FIG. 2, an O-ring groove 20 in which an O-ring 20 is fitted is formed on the inner peripheral surface of the clutch outer 12.
The diameter of the O-ring groove 20 is such that a portion of the O-ring 20 is exposed radially inward from the deepest part of the gentle contact surface 15 near the steep engaging surface 16. I have. As shown in FIG. 3, the one-way clutch 1 is mounted on a distal end portion of a shaft of an automotive alternator via a spacer 2, and is connected to a belt (not shown) driven by an engine (not shown). The one-way torque is transmitted to the shaft 6 of the vehicle alternator. 7 is grease.

The operation of the one-way clutch 1 will be described below. (Overrun (relative rotation) operation) Clutch outer 12
When the front end of the elastic deformation portion 133 of the connecting member 13 slides on the gently inclined sliding contact surface 15 in the case where The distal end portion is elastically displaced toward the small diameter side with the base end portion of the elastic deformation portion 133 as a fulcrum, and the tip end of the claw portion 17 which is the smallest diameter portion of the gently inclined sliding contact surface 15 and the subsequent steeply inclined locking surface. After passing over 16, it falls into the deepest part of the next gently inclined sliding contact surface 15.

Since the O-ring 20 is exposed on the gently inclined sliding contact surface 15, the distal end of the elastically deformable portion 133 contacts the O-ring 20 to reduce the impact and sound of the collision. The outer 12 rotates freely without transmitting torque to the clutch inner 11. (Locking (Restriction) Operation) When the clutch outer 12 is to be rotated clockwise relative to the clutch inner 11 in FIG. 1, the distal end portion of the elastic deformation portion 133 of the connecting member 13 is steeply inclined. The elastically deforming portion 133 bows and absorbs the torque, and the clutch outer 12 rotates relative to the clutch inner 11 by that amount.
When the arcuate curve 3 is further restricted by, for example, contacting the sliding contact surface 15 with a gentle inclination, the torque of the clutch outer 12 is transmitted to the clutch inner 11 through the elastic deformation portion 133.

Thus, a one-way clutch having a very simple structure can be realized, the noise can be reduced by employing the O-ring 20, and the elastic deformation portion 133 of the connecting member 13 can be used when shifting from the free rotation operation to the locking operation.
This has an excellent effect that the restraining impact can be reduced by the curved shape of the. .

(Absorptive Operation of Periodically Varying Torque During Locking (Restriction) Operation) The torque source as the vehicle internal combustion engine has a periodically fluctuating torque component and a corresponding periodically fluctuating angular velocity component. However, in this embodiment, since the periodic fluctuation component of the periodic fluctuation torque and the angular velocity can be absorbed by the degree of the bowing of the elastic deformation portion 133 which fluctuates periodically in accordance with the fluctuation, the vehicular rotation through the clutch inner 11. The AC generator can be supplied with rotational energy with little torque fluctuation and angular velocity fluctuation, thereby suppressing fluctuations in power generation output.

[0030]

Embodiment 2 Another embodiment of the one-way clutch of the present invention will be described with reference to FIG. However, for the sake of simplicity, components having the same main functions as those of the first embodiment are denoted by the same reference numerals. FIG. 5 is a perspective view of the connecting member 13, and FIG.
(A) is a front view seen in the direction perpendicular to the axis, and FIG. 6 (b) is a side view seen in the radial direction.

The connecting member 13 of this embodiment is characterized in that the connecting members 13 of the first embodiment are connected to form a cylindrical member. To explain further, this connecting member 1
3, a pair of circumferential cuts having a predetermined width in the axial direction except for the uncut portion 13a are formed in the circumferential direction at a central portion in the axial direction of a long strip-shaped phosphor bronze plate. Are cut at predetermined positions in the axial direction so that both ends reach both circumferential cuts, and cut out at a predetermined pitch and bent outward in the axial direction, similarly to the first embodiment, so that the locking plate portion 13 is formed.
2 and the elastically deforming portion 133 and the locking plate portion 132 are formed. Thereafter, the phosphor bronze plate is rounded into a cylindrical shape, and both ends are overlapped. Note that both ends may be fixed by welding or the like.

What is important is that a step 134 is further provided on the circumferential edge of the cutout opening provided in the support plate 131 of the connecting member 13 after the elastically deformable portion 133 has been cut and raised. The step 134 engages with the locking projection 18 of the clutch inner 11 to prohibit relative rotation between the connecting member 13 and the clutch inner 11 during overrun.

The step 134 is formed by the locking plate 132
Alternatively, it may be formed by cutting and raising the elastically deformable portion 133, or may be formed by a different pressing step.

[0034]

Embodiment 3 Another embodiment of the one-way clutch is shown in FIG.
This will be described below with reference to FIG. This one-way clutch 1
The connection point of the first embodiment is that the connection members 135 are separately formed, and the base ends thereof are inserted into grooves provided on the outer peripheral surface of the clutch inner 11 and are locked to the clutch inner 11. It is different from the member 13. The connection member 135 is formed of the elastically deformable portion 13 of the connection member 135 of the first embodiment.
3 has a shape substantially the same as that of FIG. 3 and is curved in a bow shape from the base end portion toward the radially outward direction, and the tip end portion thereof is pressed against the inner peripheral surface of the clutch outer 12 by its own elastic deformation. .

In this way, the structure of the connection member 135 can be simplified. (Modification) In the second embodiment, as shown in FIG. 5, an overlapping portion 13 is formed by overlapping both ends of a long strip-shaped phosphor bronze plate in the radial direction.
Although b is provided, both ends may be butted, and the butted both ends may be fixed by welding or the like.

Further, the elastically deformable portion 133 can be bent in the opposite direction to the drawing, and the number of the elastically deformable portions 133 and the number of the claw portions 17 for locking the elastically deformable portions 133 do not need to match. Further, the length of the elastically deformable portion 133 is longer than the pitch of the elastically deformable portions 133 so that a pair of adjacent elastically deformable portions 133 can overlap in the circumferential direction.
3 are spaced apart in the axial direction.

Further, a claw 1
7 may be provided, or a ridge may be provided on the sliding surface of the elastic deformation portion 133 to reduce sliding resistance.

[Brief description of the drawings]

FIG. 1 is a radial cross-sectional view of a one-way clutch according to a first embodiment.

FIG. 2 is an axial sectional view of a pulley device using the one-way clutch of FIG.

FIG. 3 is a partial axial sectional view of a vehicle alternator equipped with the pulley device shown in FIG. 2;

FIG. 4A shows the clutch inner 11 shown in FIG.
FIG. 4B is a half sectional view of the clutch inner 11 viewed from the axial direction.

FIG. 5 is a connection member 1 of the one-way clutch according to the second embodiment.
3 is a perspective view of FIG.

FIG. 6A shows the clutch inner 11 shown in FIG.
6B is a front view as viewed in a direction perpendicular to the axis, and FIG. 6B is a side view as viewed in the radial direction.

FIG. 7 is a front view of a one-way clutch according to a third embodiment.

[Explanation of symbols]

1 is a one-way clutch, 11 is a clutch inner, 12
Is the clutch outer 12, 13, 135 is a connecting member, 14
Is an O-ring (impact relief member), 15 is a gently inclined sliding contact surface,
16 is a steeply inclined locking surface, 17 is a claw portion, 18 is a locking projection,
131 is a support plate part, 132 is a locking plate part, 133 is an elastic deformation part

Claims (8)

[Claims] 1. A clutch outer and a clutch inner having confronting peripheral surfaces and concentrically arranged so as to be relatively rotatable, provided on one of the peripheral surfaces of the clutch outer and the clutch inner, and on one circumferential side. A gently inclined sliding contact surface, a substantially serrated claw portion having a steeply inclined locking surface on the other circumferential side, and one circumferential side and one radial side from the other circumferential surface of the clutch outer and the clutch inner. A connecting member having a plate-shaped elastic deformation portion whose front end is pressed against the one peripheral surface of the clutch outer and the clutch inner by its own elastic deformation, and a distal end of the elastic deformation portion. Allows relative rotation of the clutch outer and the clutch inner while sliding on the slightly inclined sliding contact surface in one direction relative to one of the clutch outer and the clutch inner. A one-way clutch which is locked by the steep locking surface during relative rotation in the opposite direction to one of the clutch outer and the clutch inner to inhibit the relative rotation. 2. The one-way clutch according to claim 1, wherein the elastically deformable portion of the connection member has a substantially axial direction in a width direction from a base end portion fixed to the other peripheral surface of the clutch outer and the clutch inner. A one-way extending toward one circumferential side and one radial side in a posture, and curved in a bow shape in a posture in which elastic deformation in a radial direction is easier than elastic deformation in a circumferential direction. clutch. 3. The one-way clutch according to claim 2, wherein the torque from the periodic torque generator is transmitted in one direction. 4. The one-way clutch according to claim 2, further comprising: a shock absorbing member located at least near a base of the claw portion and disposed on one of the clutch outer and the clutch inner. A one-way clutch that is elastically deformed by abutment of a distal end portion of the elastically deformable portion that is displaced from a distal end portion of the claw portion to a portion near the claw portion of the gently inclined sliding contact surface. 5. The one-way clutch according to claim 4, wherein said shock absorbing member comprises an O-ring. 6. The one-way clutch according to claim 1, wherein said connecting member is fixed to one of a peripheral surface of said clutch outer and a clutch inner so as to be incapable of relative movement in a circumferential direction and said peripheral surface. Has a substantially arc-shaped support plate portion extending along, and the elastically deforming portion has a shape obtained by cutting and raising the support plate portion at a predetermined width in the axial direction from one end in the circumferential direction at a predetermined width in the axial direction. A one-way clutch characterized by being formed. 7. The one-way clutch according to claim 6, wherein the connection member is locked to one of the peripheral surfaces of the clutch outer and the clutch inner so as not to be relatively movable in a circumferential direction, and is substantially cylindrical along the peripheral surface. A plurality of elastically deforming portions are formed by cutting a predetermined distance in the circumferential direction at a predetermined axial distance from the support plate portion at positions spaced apart from each other by a predetermined pitch in the circumferential direction. A one-way clutch characterized by being formed on a one-way clutch. 8. The one-way clutch according to claim 1, wherein said elastically deformable portion is curved at a larger curvature than a body portion of said elastically deformable portion so as to be able to be locked on said steeply inclined locking surface. A one-way clutch having a leading end portion.