JPH0244098Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used for power transmission that performs stepless irreversible transmission using frictional transmission.

BACKGROUND TECHNOLOGY 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 full-capacity type and conventional cage type.
1817, as a conventional example of full capacity type,
60-104818, respectively.

This invention is an improvement on the full-capacity type one-way clutch, so it
Regarding the one-way clutch disclosed in Japanese Patent Publication No. 104818, as shown in FIGS. 9 to 12, a drive wheel 3 is fitted to a driven shaft 1 via a bearing 2, and the drive wheel 3 is formed by the bearing flange of the drive wheel. The outer peripheral surface 5 of the inner ring 4
A large number of sprags 10 are inserted into the grooves of the sprags 2, and the sprags 10 are wedged between the outer ring 8 and the inner peripheral surface 9 of the outer ring 8, which is attached to the wheel body 6 attached to the driven shaft end with bolts 7. An annular garter spring 11 that urges the sprags to stand up, a wire retainer 12 that holds a large number of sprags at equal intervals, and annular side plates 13a and 13b that hold both end surfaces of the sprags 10, respectively.
is interposed.

As shown in FIG.
one side plate 13b of the annular side plates has a flange portion 13' on the outer peripheral edge, as shown in FIG.
The flange portion 13' is fitted into an annular recess 8' formed on the side surface of the outer ring 8, and the inner peripheral edge has a sliding contact portion 14 that slides in contact with the outer peripheral surface 5 of the inner ring 4, and an axial portion of the retainer 12. Equally spaced notches 15 into which the ends of the retainer 12a are fitted, and a circumferential portion 12b of the retainer 12.
and a tongue piece 16 inserted between the sprag 10 and the end surface 10' of the sprag 10.

However, in the conventional one-way clutch described above, when the sprag 10 is in the wedged state, the sprag 10 rotates together with the inner ring 4 and the outer ring 8, but when it is not in the wedged state, the sprag 10 is held by the retainer. Since the group of sprags 10 that have been rotated are in an idle state where they can rotate freely, there is no restriction on the free rotation of the inner ring or the outer ring, so that the sprags and the inner ring outer circumferential surface 5
Alternatively, slips may occur between the outer ring inner circumferential surface 9 and wear and tear on the friction wedge surface, which will eventually impede reliable friction transmission.

Tokuko Sho 51-1817, which is a conventional example of the cage type mentioned above.
In the one-way clutch disclosed in the publication,
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 10 and 10 rise above the outer circumferential surface of the inner ring, no slip occurs between the inner ring outer circumferential surface 5 and the sprags 10.

However, the conventional example of full capacity type, JP-A-60-
In the one-way clutch disclosed in Publication No. 104818, the position of the sprag is held by a U-shaped zigzag wire retainer, so when one sprag is removed in order to attach the drag clip, the other Ultimately, a full displacement one-way clutch cannot be fitted with a drag clip because it becomes difficult to hold all the sprags in place.

Problems to be solved by the invention As mentioned above, in the conventional full-capacity one-way clutch, when the inner ring or outer ring is idling, the sprag group cannot be rotated to follow the idling. This has the disadvantage that the wedge engagement surfaces between the inner and outer rings cannot be prevented from being worn out due to slips, resulting in insufficient wedge engagement, and reliable transmission cannot be expected.

Means for Solving the Problems The present invention provides a flange formed on the periphery of the annular side plate in order to cause the sprag group to follow the outer ring when the outer ring is freely rotating without installing a drag clip in a full capacity one-way clutch. An upright pawl is formed protruding from the outer circumferential edge of the part closer to the center, and is elastically engaged with the side surface of the outer ring without dividing the outer circumferential edge, and by pressing the annular side plate with the wheel body, the upright pawl is attached to the side surface of the outer ring. This is a sprag following device when the sprag is not wedged, which causes the sprag to rotate integrally with the outer ring by elastically engaging the annular side plate with the free rotation of the outer ring.

Function: An upright pawl is formed protruding from the outer peripheral edge of the flange provided on one annular side plate toward the center, which elastically engages with the outer ring side surface without dividing the outer peripheral edge, and the upright pawl is attached to the driven shaft. When the mounted wheel body is attached to the outer ring, as a result of being pressed against the side surface of the outer ring by the side surface of the wheel body, the annular side plate is held under pressure between both sides of the wheel body and the outer ring, and becomes integrated with the outer ring. The sprags freely rotate following the free rotation of the outer ring, and centrifugal force is applied to the sprags due to the free rotation, so that all the sprags are spaced apart from the outer circumferential surface of the inner ring and no slip occurs between them and the outer circumferential surface of the inner ring.

Therefore, no slip occurs between the sprags and the engagement surfaces of the inner and outer rings during free rotation of the outer ring, so that there is no wear and tear on the engagement surfaces and no hindrance to engagement transmission.

Furthermore, since the outer peripheral edge of the flange part forms a continuous annular body without being divided, and the upright claws elastically engage with the side surface of the outer ring, there are no holes in the wheel body for inserting equipment mounting bolts, nuts, etc. Even if it is inserted through the insertion hole, the outer peripheral edge of the flange portion and the upright pawl will not fit into the insertion hole.

Embodiment Figures 1 to 4 show the first embodiment of the present invention, Figures 5 to 7 show the second embodiment of the invention, and Figure 8 shows the invention applied to a wheel body having an insertion hole. The mounted state is shown, and the same structural parts in FIGS. 1 to 8 as in the conventional example shown in FIGS. 9 to 12 are designated by the same reference numerals.

In the annular side plate 13b' having the flange portion 13'' in the first embodiment (corresponding to the annular side plate 13b of the conventional example), a slit is cut toward the center without dividing the periphery of the flange portion 13''. A plurality of upright pawls 13 are formed at equal intervals by bending and deforming the portion divided by the slit toward the outer ring, and the upright pawls 13 are given bending elasticity. (See Figures 1 to 3) Figure 4 shows that the annular side plate 13b' having the upright pawl 13 in the first embodiment is interposed between the inner and outer rings of a one-way clutch, and the flange portion 13'' is inserted into an annular recess on the side surface of the outer ring. As a result of the upright pawl 13 coming into elastic contact with the groove bottom of the annular recess 8', the annular side plate 13b' frictionally engages with the outer ring 8 when the outer ring 8 rotates freely. Since the sprags 10 rotate integrally with the outer ring, the group of sprags 10 rises above the outer peripheral surface of the inner ring and rotates following the outer ring.

In the second embodiment shown in FIGS. 5 to 7, the annular side plate 13b'' does not have a portion in the flange portion 13'' that comes into sliding contact with the inner circumferential surface 9 of the outer ring 8, and this portion is an inclined surface T, and The inner circumferential surface of the side plate 13b'' also includes the inner ring outer circumferential surface 5.
It does not form a portion 14 that comes into sliding contact with the
The operation is the same as that of the first embodiment, but the cost can be reduced compared to the annular side plate 13b' of the first embodiment.

FIG. 8 shows a one-way clutch in which the wheel body 6 is provided with holes 17 for inserting bolts, nuts, etc. for attaching the device G, and the annular side plate 13b' or 13b'' of the present invention is shown in FIG. The outer peripheral edge of the flange part is continuous in an annular shape without being divided, and the upright pawl 13 protrudes toward the annular recess 8' side of the outer ring side. There is no risk of it engaging.

Effects of the invention The present invention provides a full-capacity one-way clutch to which a drag clip cannot be attached, by attaching the outer peripheral edge of the flange to the center of the flange of one of the pair of annular side plates that support both end surfaces of the sprag. It is possible to bend and deform the upright pawl toward the outer ring without dividing it, and by the upright pawl, the side plate is elastically engaged with the outer ring, and when the outer ring rotates freely, the sprag group can be rotated integrally with the outer ring. Therefore, even if the outer ring rotates with high angular acceleration, there will be no relative sliding between the sprags and the outer ring due to inertia, so wear on the outer ring and sprags can be significantly reduced even with poor lubrication, and response performance is also excellent. improve.

Furthermore, even if a large impact load is applied when the sprags are wedged together, and a relative movement occurs between the sprag group and the outer ring, the annular side plate will not move because the upright claws and the outer ring are in elastic frictional engagement. Since it can slip against the outer ring and buffer the impact load, it does not damage the sprag group and the sprag wedge surfaces of the inner and outer rings, and also allows the outer peripheral edge of the flange to be continuous in an annular shape without being separated. Since the upright pawl is formed by bending and deforming toward the outer ring side, even if the wheel body has a recess such as a mounting hole for installing a device, the outer peripheral edge of the flange portion and the upright pawl will not fit into the recess. Since there is no risk of immersive engagement, slipping against the impact load is performed without any problem, improving the performance of the one-way clutch, and
The effect of increasing durability is extremely large.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention.
The figure is a front view of an annular side plate having an elastic flange portion, Fig. 2 is a cross-sectional view taken along the line of Fig. 1, Fig. 3 is a perspective view of an annular side plate having a partially cut-out upright claw, and Fig. 4 is a perspective view of an annular side plate with an upright claw. 5 to 7 show a second embodiment of the present invention, and FIG. 5 is a front view of the annular side plate having an upright pawl. , Fig. 6 is a sectional view taken along line Y-Y in Fig. 5, Fig. 7 is a side sectional view of the main part of a one-way clutch equipped with an annular side plate having an upright pawl, and Fig. 8 is a wheel having a mounting tool insertion hole. FIG. 9 is a side cross-sectional view of the main part of the one-way clutch of the present invention attached to the body;
Figure 2 shows a conventional example of a full capacity one-way clutch.
Fig. 9 is a side sectional view of the main part of a full capacity one-way clutch, Fig. 10 is a front sectional view of the main part showing a state in which a sprag is interposed between the inner and outer rings, and Fig. 11 is a perspective view of the wire retainer. FIG. 12 is a partially cutaway perspective view of an annular side plate having a flange portion. DESCRIPTION OF SYMBOLS 1... Driven shaft, 4... Inner ring, 6... Wheel body, 8... Outer ring, 10... Sprag, 11... Garter spring, 12... Wire retainer, 12a
...Axial portion of the retainer, 12b...Circumferential portion of the retainer, 13a, 13b, 13b', 13
b″...Annular side plate, 13″...Flange part, 13
...erect claws.

Claims (1)

[Scope of utility model registration request] 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, an annular retainer that holds each sprag and has alternating axial and circumferential parts, and both sides of the sprags and the circumferential part of the retainer. In a one-way clutch, which has a pair of annular side plates mounted between the inner and outer rings and held between the inner and outer rings, and a radial flange portion on the periphery of one of the pair of annular side plates, from the outer periphery of the flange portion A sprag following device for non-wedge engagement that has a protruding pawl that elastically engages with the side surface of the outer ring without dividing the outer peripheral edge near the center.