JPH0244096Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is used as an element of a power transmission mechanism, and frictionally transmits rotation of the driving wheel in only one direction to the driven wheel, and rotation of the driving wheel in the opposite direction. It does not transmit rotation.

Prior Art A one-way clutch is a well-known power transmission means, and basically consists of a sprag, a retainer, and a garter spring interposed between a concentric inner ring and an outer ring. It is broadly divided into capacitive type and capacitive type.

A conventional cage-type example is shown in Japanese Patent Publication No. 1817-1983, and a conventional example of a full-capacity type is shown in Japanese Patent Application Laid-Open No. 58-1989.
Each of these is disclosed in Publication No. 163832.

Since the present invention is an improvement on a full capacity one-way clutch, a conventional example of a full capacity one-way clutch will be described with reference to Figs. 9 to 11. A large number of sprags C are interposed between an inner ring F and an outer ring D. and an annular garter spring S that urges the sprags C to stand up in the wedge direction, an annular wire retainer R that holds a large number of sprags C at equal intervals, and sprags C.
The outer periphery of the side plate P is in sliding contact with the inner periphery of the outer ring D, and the inner periphery is the inner periphery of the inner ring F.
It is in sliding contact with the outer periphery of.

When the sprags C are in a friction wedge state, the sprags C rotate together with the inner ring F and the outer ring D, but when they are not in a friction wedge state, the group of sprags C held by the retainer R is Since it is in an idle state where it can rotate freely, there is no restraint on the free rotation of the outer ring or inner ring, so slips occur between the sprags and the outer circumferential surface of the inner ring or the inner circumferential surface of the outer ring, causing wear on the wedge surfaces. Eventually, reliable frictional transmission will be hindered.

In addition, when the drive wheels (outer or inner wheels) suddenly accelerate, stop, reverse, or otherwise engage or disengage, the sprag group remains in an idle state, resulting in poor response and abnormal impact loads. It may even be accompanied.

In the cage type one-way clutch mentioned above,
Since a drag clip is provided, the sprag group is frictionally engaged with the outer ring by the drag clip even during free rotation, and rotates integrally with the outer ring, and this rotation causes centrifugal force to act on each sprag. Since the sprags float above the outer circumferential surface of the inner ring, no slip occurs between the outer circumferential surface of the inner ring and the sprags. If one sprag is removed in order to install the drag clip, it becomes difficult to hold all the other sprags in position. It cannot be installed.

Therefore, the applicant has already proposed a device in Utility Application No. 138653/1986 to make the sprag group follow the outer ring during free rotation in a full capacity one-way clutch, but this device has a side plate with a diameter larger than the raceway diameter. It is necessary to provide an elastic flange, and it is necessary to have a structure in which the elastic flange is clamped by the wheel body between the outer ring side surface and the general structure shown in Figs. 9 and 10. It cannot be attached to a one-way clutch.

Problems to be Solved by the Invention The present invention is a full-capacity one-way clutch having a general structure as shown in FIGS. It is intended to integrate the

Means for solving the problem A plurality of sprags are installed in an annular manner between the inner and outer rings, a garter spring that urges these sprags in the direction of wedge engagement between the inner and outer rings, and an axial portion and a circumferential portion that hold each sprag. an annular retainer having alternating direction portions; and an annular side plate that is engaged between the sprag end face and the retainer and held in sliding contact between the inner and outer rings, and a notch is provided on the outer peripheral edge of the side plate. This is a one-way clutch provided with a friction engagement ring that engages in the notch and is in expanded elastic contact with the inner circumferential surface of the outer ring.

Function: The frictional engagement member inserted into the notch provided on the outer periphery of the annular side plate is in expanded resilient contact with the inner circumferential surface of the outer ring, so when the outer ring rotates freely, it comes into pressure contact with the inner circumferential surface of the outer ring. The frictional engagement member rotates together, and the annular side plate engaged with the frictional engagement member is also rotated at the same time.

Since the annular side plate is engaged with the retainer and the retainer holds each sprag, the sprag group rotates as the outer ring freely rotates.

Therefore, as the sprag group rotates integrally with the free-rotating outer ring, it is separated from the outer circumferential surface of the inner ring by the action of centrifugal force, so the friction wedge surface of each sprag is connected to the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. There is no slippage between the parts, so there is no wear and tear.

Embodiment FIG. 1 is a front view of an annular side plate with a notch on the outer periphery, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. are interposed, and each sprag C has an axial portion R ₁
An annular side plate 1 that holds end faces of a group of sprags C and is arranged and held at equal intervals by an annular wire retainer R in which a circumferential portion R ₂ and a circumferential portion R 2 are alternately and continuously formed.
A notch groove spanning the wire diameter of the wire rod retainer R is provided on the inner peripheral edge of the wire rod retainer R, and the engaging piece 1' inserted between the end face of the sprag C and the circumferential portion _R2 of the retainer R and the sprag Circumferential part of retainer R on the end face of C
There is no difference from the conventional example in that a bent guide piece 1'' is formed on the open side of the retainer R where R ₂ is not facing, but in the present invention, an appropriate number of bent guide pieces 1'' are formed on the outer peripheral edge of the annular side plate 1. A notch 2 is formed.

Then, the engagement protrusion 3' of the friction engagement ring 3 shown in FIG. 3 is inserted into the notch 2.

Further, the frictional engagement ring 4 of the other embodiment shown in FIG. Lock it to one of the.

The friction engagement rings shown in FIGS. 3 and 4 are elastic bodies whose outermost diameters are slightly larger than the inner circumferential diameter of the outer ring, and which are urged to expand and engage with the annular side plate. The outermost diameter portion comes into expanded resilient contact with the inner circumferential surface of the outer ring when the outer ring is placed on the inner circumferential surface of the outer ring, and frictionally engages with the inner circumferential surface of the outer ring.

5 and 6 are views of the friction engagement ring 3 shown in FIG. 3 being engaged with one of the annular side plates 1, and when the sprag C is not wedged, that is, when the outer ring or the inner ring is freely rotating. , the engagement protrusion 3' of the frictional engagement ring 3, which is inserted into the notch 2 of the annular side plate 1 and comes into elastic contact with the inner circumferential surface of the outer ring D, moves the annular side plate 1 along with the free rotation of the outer ring D. Since the rotation of the annular side plate 1 rotates the group of sprags C together with the retainer R, the group of sprags C rotates integrally with the free rotation of the outer ring D, and due to this rotation, the group of sprags C rotates integrally with the free rotation of the outer ring D. Since each sprag C is urged outward by the action of centrifugal force, no slipping or the like occurs on the contact surface between the sprag C and the outer peripheral surface of the inner ring F, so that wear and tear does not occur.

Moreover, FIGS. 7 and 8 are diagrams in which the frictional engagement ring 4 shown in FIG. 4 is engaged with one annular side plate 1, and
When the sprag C is not wedged, that is, when the outer ring or the inner ring is freely rotating, the engagement hook 4' of the friction engagement ring 4 is engaged with one of the notches 2 of the annular side plate 1. When expanded and brought into elastic contact with the inner circumferential surface of outer ring D,
Since the entire outer circumference of the ring 4 is in pressure contact with the inner circumferential surface of the outer ring, the ring 4 rotates with the free rotation of the outer ring D, and the engagement hook 4' of the ring 4 is inserted into the annular side plate 1, The retainer R and the group of sprags C rotate together with the free rotation of the outer ring, so that no slips or the like occur on the contact surfaces between the respective sprags C and the outer peripheral surface of the inner ring, and no wear occurs on the contact surfaces. do not have.

Note that reference numeral 5 denotes a snap spring fitted into an annular groove on the inner circumferential surface of the outer ring, which restricts the movement of the frictional engagement ring 3 or 4 outward in the axial direction. 3 or 4 engagement is held securely.

The snap spring 5 is not necessary when the movement of the frictional engagement ring 3 or 4 in the axial direction outward is restricted by another member (not shown) or the like.

Further, the expansion elastic force of the frictional engagement ring 3 or 4 can be set to any desired value by changing the inner diameter of the ring and changing the thickness in the radial direction without changing the plate thickness. No extra space in the axial direction is required compared to the example.

Effects of the invention The present invention is a full-capacity one-way clutch to which a drag clip cannot be attached. When the inner ring is idling,
Since the sprag group can be rotated integrally with the outer ring to prevent wear and tear on the friction wedge surfaces of the sprag and the inner and outer rings, the length between the end faces of the inner and outer rings, that is, the axial width, is the width of the one-way clutch. It can be easily attached to a general full-capacity one-way clutch that is larger than the conventional one-way clutch, and has practical effects such as being able to be attached without changing the axial width of a conventional one-way clutch.

[Brief explanation of the drawing]

Drawings 1 to 8 show embodiments of the present invention.
The figure is a front view of the main part of the one-way clutch before the friction engagement ring is installed, Figure 2 is a cross-sectional view on the - line side of Figure 1,
FIG. 3 is a front view of the first embodiment of the friction engagement ring;
FIG. 4 is a front view of the second embodiment of the friction engagement ring;
Figure 5 is a front sectional view of a one-way clutch equipped with the ring shown in Figure 3, Figure 6 is a side sectional view of the main part of Figure 5, and Figure 7 is a one-way clutch equipped with the ring shown in Figure 4. 8 is a side sectional view of the main part of FIG. 7, FIGS. 9 to 11 show a conventional one-way clutch, FIG. 9 is a front sectional view of a part of the one-way clutch, and FIG. Figure 10 is a side sectional view of the main part of Figure 9,
FIG. 1 is a perspective view of the wire retainer. 1... Annular side plate, 2... Notch, 3, 4... Friction engagement ring, D... Outer ring, F... Inner ring, C...
Sprag, R... wire retainer, S... garter spring, P... annular side plate.

Claims (1)

[Scope of utility model registration request] An annular sprag having a plurality of sprags interposed annularly between the inner and outer rings, a garter spring that biases these sprags in the direction of wedge engagement between the inner and outer rings, and alternating axial parts and circumferential parts that hold the respective sprags. It comprises a wire retainer, and an annular side plate that is engaged between the sprag end face and the retainer and held in sliding contact between the inner and outer rings, and a notch is provided on the outer periphery of the side plate, and the annular side plate is provided with a notch on the outer peripheral edge of the side plate. A one-way clutch equipped with a friction engagement ring that is inserted into the inner circumferential surface of the outer ring and is in expanded elastic contact with the inner peripheral surface of the outer ring.