JP2002130333A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve weight reduction and manufacturing cost reduction of a one-way clutch. SOLUTION: The one-way clutch wherein a drive member 1 and a second member 2 are disposed so that one surrounds the other with space separated radially and both members are connected to each other by way of rolling elements 4 retained therebetween, is characterized in that one of the members that is far from a shaft center comprises a retainer 5 of shaft center side and an outer body 6 having contact with the contour of the retainer 5, a cam face 6a is formed in part of the internal circumference of the outer body 6, and a space 3 for accommodating the rolling elements 4 is formed in the retainer 5 at the position corresponding to the cam face 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch for transmitting only rotation in one direction of a driving member to a driven member and not transmitting rotation in the opposite direction.

[0002]

2. Description of the Related Art FIG. 11 is a partially cutaway side view showing an example of a conventional one-way clutch (a view taken along the line XI-XI in FIG. 12), and FIG. 12 is a sectional view taken along the line XII-XII in FIG. .

In these figures, a driving member 01 and a driven member 02 are arranged at an interval in the radial direction, and the two members are cylindrical rolling elements held in a space 03 formed in the driven member 02. They are connected to each other via 04. A cam surface 02a is formed at the innermost surface of the space 03, that is, at the inner peripheral surface of the driven member 02 with which the rolling element 04 contacts. A spring holder hole 010 is formed from the outer periphery of the driven member 2 to the space 03, and a spring stopper 011 is press-fitted into the spring holder hole 010. A spring 08 and a spring holder 09 are fitted between the spring stopper 011 and the rolling element 04. 012 and 013 are a cover and a plate made of sheet metal.

In such a one-way clutch, when the driving member 01 rotates in the direction of the arrow (counterclockwise) in FIG. 11, the rolling element 04 is also urged by the spring 08 to move in the counterclockwise direction. Then, the rolling element 04 is pressed tightly against the driving member 01 and the driven member 02 in a wedge-shaped space formed between the outer peripheral surface of the driving member 01 and the cam surface 02a of the driven member 02. The rotation of the driven member 02
Is transmitted to

On the other hand, when the driving member 01 rotates in the direction of arrow Q (clockwise) in FIG. 11, the rolling element 04 moves clockwise against the force of the spring 08. Then rolling element 04
Does not come into close contact with either the outer peripheral surface of the driving member 01 and the cam surface 02a of the driven member 02, and the rotation of the driving member 01 is not transmitted to the driven member 02.

[0006]

In the conventional one-way clutch described above, the cam surface 02a of the driven member 02 is required to have strength and hardness, but a material that satisfies the requirements is expensive and difficult to machine. Was. Further, since the spring holder hole 010 can be formed only from the outer peripheral side of the driven member 02, it is necessary to press-fit the spring stopper 011 to stop the spring 08, which is troublesome.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the invention according to claim 1 is arranged such that a driving member and a driven member are spaced apart in a radial direction so that one of them surrounds the other. The one-way clutch is arranged and connected to each other via a rolling element held between the two members. In the one-way clutch, the member farthest from the axis of the two members is attached to the retainer on the axis side and the outer periphery of the retainer. A cam surface is formed on a part of the inner periphery of the outer body, and a space for accommodating the rolling element is formed in the retainer at a position corresponding to the cam surface. It is characterized by the following.

The invention according to claim 1 is constructed as described above, wherein a member farther from the axis of the driving member and the driven member is formed by a retainer on the axis side and an outer body in contact with the outer periphery of the retainer. A cam surface is formed on a part of the inner periphery of the outer body, and a space for accommodating the rolling element is formed on the retainer at a position corresponding to the cam surface. The outer body is made of an expensive material with high strength and hardness, and the retainer, which only needs to hold and hold the rolling elements, is made of inexpensive and easy-to-process material. For example, the cost can be reduced and the weight can be reduced. Further, since the main part of the processing of the outer body is only the shallow cam surface, the processing cost is further reduced.

According to the first aspect of the present invention, the bottom of the spring holder hole into which the spring for biasing the rolling element is inserted is formed.
Since it can be formed on the inner peripheral surface of the outer body, a step of forming a spring holder hole from the outside and press-fitting a separate spring stopper as in the related art can be eliminated.

Next, a second aspect of the present invention is the first aspect.
In the invention described in the above, the retainer is divided into two parts by a plane intersecting a rotation axis, and a space for accommodating the rolling element and a spring holder hole of a spring for biasing the rolling element are formed on the divided plane. It is characterized by the following. Therefore, according to the second aspect of the present invention, it becomes easier to machine the space for accommodating the rolling element and the spring holder hole of the spring for biasing the rolling element.

Next, a third aspect of the present invention is directed to the second aspect.
In the described invention, the outer peripheral surface of the retainer is formed in a truncated cone shape that gradually increases from the divided surface toward both end surfaces, and the inner peripheral surface of the outer body is correspondingly formed into two truncated cone surfaces. Is formed. Therefore, according to the third aspect of the present invention, when assembling a member farther from the axis among the driving member and the driven member, one of the divided retainers, the outer body,
If the retainers are stacked in the other order, positioning can be performed very easily.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway side view showing a first embodiment of the present invention (a view taken along the line II in FIG. 2), and FIG. 2 is a sectional view taken along the line II-II in FIG. The figure shows a state in which the rolling element 4, the spring 8, and the spring holder 9 in FIG. 1 have been removed.

In the one-way clutch of the present embodiment, a hollow shaft 1 as a driving member and a driven member 2 are arranged at an interval in a radial direction, and a cylindrical rolling element 4 held between the two members is provided. Are connected to each other.

In this embodiment, the driven member 2 is farther from the axis than the driving member 1, that is, the driven member 2 is disposed so as to surround the outside of the driving member 1.
Is composed of a retainer 5 on the axial center side and an outer body 6 in contact with the outer periphery of the retainer 5. A cam surface 6a is formed on a part of the inner periphery of the outer body 6. On the other hand, the retainer 5 has a position corresponding to the cam surface 6a,
A space 3 for accommodating the rolling element 4 is formed.

In this embodiment, the retainer 5 is further divided into a left retainer 5a and a right retainer 5b by a plane 5c orthogonal to the rotation axis 7, and along the divided surface 5c,
Space 3 for accommodating rolling element 4 and spring holder hole
10 are formed. And its spring holder hole
A spring 8 and a spring holder 9 are inserted into the inside 10 so as to bias the rolling element 4 in a counterclockwise direction in FIG.

Further, in the present embodiment, the retainer 5
The outer peripheral surface 5d of a, 5b is formed in a truncated cone shape whose diameter gradually increases from the dividing surface 5c toward both end surfaces. And, correspondingly, the inner peripheral surface of the outer body 6 forms two truncated conical surfaces.

In such a one-way clutch, when the hollow shaft 1 rotates in the direction of arrow P (counterclockwise) in FIG.
The rolling element 4 is also urged by the spring 8 and moves counterclockwise. Then, the rolling element 4 is tightly pressed against the hollow shaft 1 and the outer body 6 in a wedge-shaped space formed between the outer peripheral surface of the hollow shaft 1 and the cam surface 6a of the outer body 6, so that the The rotation is the driven member 2 as it is
Is transmitted to

On the other hand, when the hollow shaft 1 rotates in the direction of arrow Q (clockwise) in FIG. 1, the rolling element 4 moves clockwise against the force of the spring 8. Then, the rolling element 4 does not come into close contact with either the outer peripheral surface of the hollow shaft 1 and the cam surface 6a of the outer body 6, and the rotation of the hollow shaft 1 is not transmitted to the driven member 2.

In the present embodiment, the driven member 2 has a retainer 5 in which a space 3 for accommodating the rolling element 4 is formed, and a cam surface 6a formed in a part of the inner periphery in contact with the outer periphery of the retainer 5. Since the outer body 6 is divided into the outer body 6 and the outer body 6, which is required to have strength and hardness, only the outer body 6 is manufactured from a strong material, and the retainer 5 having only the role of housing and holding the rolling elements 4 is provided. For example, an inexpensive and easily processed material such as plastic can be used. Therefore, not only the cost can be reduced, but also the weight can be reduced.

Since the spring holder hole 10 is formed in the retainer 5 and the bottom of the spring holder hole 10 is formed on the inner peripheral surface of the outer body 6, the spring holder hole 010 is formed from the outside as in the conventional case. The step of piercing and press-fitting the spring stopper 011 becomes unnecessary. The main part of the processing of the outer body 6 made of a strong material is only the cam surface 6a, and the space 3 is formed in the retainer 5 which can use a material which can be easily processed. As compared with the case where the space 03 is deeply cut, the processing cost is significantly reduced.

In the original embodiment, the retainer 5 is also divided into two parts by a plane 5c perpendicular to the rotation axis 7, and the space 3 for accommodating the rolling element 4, the spring 8, and the spring holder 9 are inserted along the division surface 5c. Since the spring holder hole 10 is formed, the processing is also easy at that point.

In addition, in the present embodiment, each outer peripheral surface 5d of the divided retainers 5a, 5b is formed in a truncated cone shape whose diameter gradually increases from the divided surface 5c toward both end surfaces,
Correspondingly, the inner peripheral surface of the outer body 6 forms two frusto-conical surfaces, so when assembling the driven member 2,
If one of the divided retainers 5a and 5b, the outer body 6, and the other of the retainers are stacked in this order, positioning can be performed very easily.

1 and 2, the hollow shaft 1
Is drawn as if the outer peripheral surface is in contact with the inner peripheral surface of the retainer 5, but is actually exposed by a gap of about 0.4 mm.

FIG. 3 is a partially cutaway side view showing the second embodiment of the present invention (a view taken along the line III-III in FIG. 4), and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3 shows a state in which the rolling element 14, the spring 18, and the spring holder 19 in FIG. 3 have been removed.

Also in this embodiment, a collar 11 as a driving member and a driven member 12 are arranged at intervals in the radial direction, and are connected to each other via a cylindrical rolling element 14 held between the two members. Is done.

Also in the present embodiment, the driven member 12 disposed so as to surround the outside of the collar 11 is composed of the retainer 15 on the axial center side and the outer body 16 in contact with the outer periphery of the retainer 15. A cam surface is provided on a part of the inner periphery of the outer body 16.
16a are formed. On the other hand, the retainer 15 has a space for accommodating the rolling element 14 at a position corresponding to the cam surface 16a.
13 are formed.

Also in the present embodiment, the retainer 15 is separated from the left retainer 15 by the plane dividing surface 15c orthogonal to the rotation axis 17.
15a and a right retainer 15b.
A space 13 for accommodating the rolling element 14 and a spring holder hole 20 are formed along the line. And the spring 18 and the spring holder 19 in the spring holder hole 20
Is inserted, and the rolling element 14 is urged in the counterclockwise direction in FIG. In the present embodiment, the outer end surfaces of the left retainer 15a and the right retainer 15b extend toward the axis, thereby narrowing the collar 11 and restricting the relative movement of the collar 11 and the driven member 12 in the axial direction. . In the present embodiment, a gear 16a is formed on the outer periphery of the outer body 16, and transmits rotation to a driven shaft (not shown).

In this embodiment, the retainer 15
An outer peripheral surface 15d of each of a and 15b is formed in a truncated cone shape whose diameter gradually increases from the dividing surface 15c toward both end surfaces. And, correspondingly, the inner peripheral surface of the outer body 16 forms two frustoconical surfaces.

In FIGS. 3 and 4, the color
Although the outer peripheral surface of 11 is drawn as if in contact with the inner peripheral surface of the retainer 15, it is actually exposed with a gap of about 0.4 mm.

In such a one-way clutch, when the collar 11 rotates in the direction of arrow P in FIG. 3 (counterclockwise), as in the first embodiment, the rolling element 14 is also urged by the spring 18 to rotate counterclockwise. Then, the rolling element 14 is moved to the outer peripheral surface of the collar 11 and the cam surface 16 of the outer body 16.
a is tightly pressed against the collar 11 and the outer body 16 in a wedge-shaped space formed between the driven member 12 and the driven member 12.

When the collar 11 rotates in the direction of the arrow Q (clockwise) in FIG. 3, the rolling element 14 moves clockwise against the force of the spring 18. Then, the rolling element 14 does not come into close contact with any of the outer peripheral surface of the collar 11 and the cam surface 16a of the outer body 16, and the rotation of the collar 11 is not transmitted to the driven member 12.

Also in this embodiment, a retainer 15 in which a space 13 for accommodating a rolling element 14 is formed, and an outer body 16 in contact with the outer periphery of the retainer 15 and having a cam surface 16a formed in a part of the inner periphery. In addition, since the driven member 12 is divided, only the outer body 16 that requires strength and hardness is manufactured from a strong material, and the retainer 15 having only the role of housing and holding the rolling element 14 is provided. Inexpensive and easily processable materials can be used. Therefore, not only the cost can be reduced, but also the weight can be reduced.

The spring holder hole 20 has a retainer.
15 and the bottom of the spring holder hole 20 is formed on the inner peripheral surface of the outer body 16, so that the spring holder hole 010 is drilled from the outside and the spring stopper 011 is press-fitted as in the conventional case. Step becomes unnecessary. The main part of the processing of the outer body 16 made of a strong material is only the cam surface 16a, and the space 13 is formed in the retainer 15 which can use a material which can be easily processed. As compared with the case where the space 03 is deeply cut, the processing cost is significantly reduced.

Also in this embodiment, the retainer 15 is divided into two parts by a plane 15c perpendicular to the rotation axis 17,
a space 13 for accommodating the rolling elements 14 and a spring 18 along c;
Spring holder hole for inserting spring holder 19
Since 20 is formed, processing is also easy in that respect.

Each of the outer peripheral surfaces 15d of the divided retainers 15a and 15b is formed in a truncated cone shape whose diameter gradually increases from the divided surface 15c toward both end surfaces, and the inner peripheral surface of the outer body 16 is correspondingly formed. Since the surfaces form two frusto-conical surfaces, when assembling the driven member 12, if one of the divided retainers 15a and 15b, the outer body 16 and the other of the retainers are stacked in this order, positioning can be performed very easily. it can.

FIG. 5 is a partially cutaway side view (a view taken along the line V--V in FIG. 6) showing a third embodiment of the present invention. FIG.
5 is a sectional view taken along the line VI-VI of FIG. 5, and FIG. 7 is a sectional view taken along the line VII-VII of FIG.
This shows a state where the spring holder 29 has been removed. 8 is a view showing the left retainer in FIGS. 5 and 6, and FIG. 9 is a view showing the right retainer in the same manner.
FIG. 3 is a view showing the outer body taken out.

Also in this embodiment, a hollow shaft 21 as a driving member and a driven member 22 are arranged at intervals in the radial direction, and are mutually connected via a cylindrical rolling element 24 held between the two members. Be linked.

Also in this embodiment, the driven member 22 disposed so as to surround the outside of the hollow shaft 21 is composed of a retainer 25 on the axial center side and a contact 26 with the outer periphery of the retainer 25. And 26
A cam surface 26a is formed on a part of the inner periphery of the cam. On the other hand, the retainer 25 has a space 23 for accommodating the rolling element 24 at a position corresponding to the cam surface 26a.

The retainer 25 is divided into a left retainer 25a and a right retainer 25b by a plane 25c orthogonal to the rotation axis 27, and a space for accommodating the rolling elements 24 along the divided surface 25c.
The formation of the spring holder hole 23 and the spring holder hole 30 is the same as that of the above-described embodiment, but in the present embodiment, the divided retainers 25a and 25b are manufactured by a sheet metal press.

As described above, FIGS. 8 and 9 show the left retainer 25a and the right retainer 25b, respectively.
In these figures, the figure (a) is the inner side (the division surface 25c side).
(FIG. (B), FIG. (C) as viewed in the direction of arrow A), FIG. (B) is a cross-sectional view as viewed in the direction of arrow BB in FIG. (A), and FIG. It is CC sectional view taken on the arrow.

The left retainer 25a and the right retainer 25
Then, the driven member 22 is assembled by bringing the inner surface of the outer member b into close contact and fitting the inner surface (axial side) of the outer body 26 shown in FIG. Then, the rolling element 24, the spring 28, and the spring holder 29 are accommodated in the space 23 and the spring holder hole 30 formed along the division surface 25c, respectively.

In such a one-way clutch, when the hollow shaft 21 rotates in the direction of arrow P (counterclockwise) in FIG.
As in the above embodiments, the rolling elements 24 are also urged by the springs 28 and move counterclockwise. Then, the rolling element 24 is pressed tightly against the hollow shaft 21 and the outer body 26 in a wedge-shaped space formed between the outer peripheral surface of the hollow shaft 21 and the cam surface 26a of 26, so that the rotation of the hollow shaft 21 It is transmitted to the driven member 22 as it is.

When the hollow shaft 21 rotates in the direction of the arrow Q (clockwise) in FIG. 5, the rolling element 24 moves clockwise against the force of the spring 28. Then, the rolling element 24 does not come into close contact with either the outer peripheral surface of the hollow shaft 21 and the cam surface 26a of the outer body 26, and the rotation of the hollow shaft 21 is not transmitted to the driven member 22.

Also in this embodiment, a retainer 25 in which a space 23 for accommodating the rolling element 24 is formed, and an outer body 26 in contact with the outer periphery of the retainer 25 and having a cam surface 26a formed in a part of the inner periphery. The retainer 25, in which the driven member 22 is divided and only the outer body 26 that requires strength and hardness is made of a strong material and has only the role of housing and holding the rolling element 24, is inexpensive and Manufactured with a sheet metal press that is easy to process. Therefore, not only the cost can be reduced, but also the weight can be reduced.

The spring holder hole 30 is provided with the retainer 25.
Since the bottom of the spring holder hole 30 is formed on the inner peripheral surface of the outer body 26, the spring holder hole 010 is formed from the outer periphery as in the conventional case, and the spring stopper 011 is press-fitted. The process becomes unnecessary. The main part of the processing of the outer body 26 made of a strong material is only the cam surface 26a, and the space 23 is formed in the retainer 25 manufactured by a sheet metal press that is easy to process.
Compared with the conventional case where the space 03 is deeply cut from the entire driven member 02, the processing cost is significantly reduced.

Also in this embodiment, the retainer 25 is divided into two parts by a plane 25c perpendicular to the rotation axis 27,
c, a space 23 for accommodating the rolling elements 24 and a spring 28,
Spring holder hole to insert spring holder 29
Since 30 is formed, the processing is also easy in that respect.

In each of the above embodiments, the case where the driven member is farther from the axis than the driving member, that is, the case where the driven member is arranged so as to surround the outer periphery of the driving member has been described. It goes without saying that the present invention can be applied to a case where the member is farther from the axis than the driven member, that is, when the driving member is arranged so as to surround the driven member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of the present invention (a view taken in the direction of an arrow II in FIG. 2).

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a partially cutaway side view (a view taken along the line III-III in FIG. 4) showing the second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line VI-VI in FIG. 3;

FIG. 5 is a partially cutaway side view showing a third embodiment of the present invention (a view taken in the direction of arrows VV in FIG. 6).

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5;

FIG. 8 is a view showing the left retainer in FIGS. 5 and 6;

FIG. 9 is a view showing the right retainer in FIGS. 5 and 6 taken out therefrom.

FIG. 10 is a view showing an outer body taken out of FIGS. 5 and 6;

FIG. 11 is a partially cutaway side view showing an example of a conventional one-way clutch (a view taken along the line XI-XI in FIG. 12).

FIG. 12 is a sectional view taken along the line XII-XII in FIG. 11;

[Explanation of symbols]

1, 11, 21: driving member, 2, 12, 22: driven member, 3, 1
3, 23 ... space, 4, 14, 24 ... rolling element, 5, 15, 25 ... retainer, 5a, 15a, 25a ... left retainer, 5b, 15b, 25
b: right retainer, 5c, 15c, 25c: dividing surface, 5d, 15
d: Outer peripheral surface, 6, 16, 26: Outer body, 6a, 16
a, 26a: cam surface, 16b: gear, 7, 17, 27 ... rotation axis, 8, 18, 28 ... spring, 9, 19, 29 ... spring holder, 10, 20, 30 ... spring holder hole.

Claims (3)

[Claims] A one-way clutch in which a driving member and a driven member are arranged so as to be spaced apart from each other in the radial direction so as to surround one another, and are connected to each other via a rolling element held between the two members. Of the two members, the member farthest from the axis is composed of a retainer on the axis side and an outer body in contact with the outer periphery of the retainer, and the outer body has a cam surface formed on a part of the inner periphery. A one-way clutch, wherein a space for accommodating the rolling element is formed in the retainer at a position corresponding to the cam surface. 2. The method according to claim 1, wherein the retainer is divided into two parts by a plane intersecting a rotation axis, and a space for accommodating the rolling element and a spring holder hole for a spring for biasing the rolling element are formed on the divided plane. The one-way clutch according to claim 1, wherein: 3. An outer peripheral surface of the retainer is formed in a truncated conical shape whose diameter gradually increases from the divided surface toward both end surfaces, and the inner peripheral surface of the outer body has two correspondingly. The one-way clutch according to claim 2, wherein a frustoconical surface is formed.