JPH0540336Y2 - - 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 transmits only one direction rotation of the drive wheel to the driven wheel, and does not transmit rotation of the drive wheel in the opposite direction. Concerning direction clutch.

PRIOR ART AND THE PROBLEMS The one-way clutch is a conventionally well-known power transmission means, which basically consists of a sprag, a retainer, and a garter spring interposed between a concentric inner ring and an outer ring.

During power transmission, the sprags are wedged between the inner and outer rings, and the inner ring, outer ring, and sprag group rotate as one. However, when they are not wedged, the sprags are not constrained between the inner and outer rings, so the sprags are wedged between the inner and outer rings. Friction occurs between the inner circumferential surface and the outer circumferential surface of the inner ring, and the sprags cause wear on the wedge surfaces, which eventually impedes reliable frictional transmission.
Therefore, in a cage type one-way clutch, the drag clip presses the sprags against the outer ring, and even when they are not in a wedged state, the sprags frictionally engage with the outer ring and rotate as one, and centrifugal force acts on the sprag group to prevent it from lifting off the inner ring. However, full capacity one-way clutches cannot be fitted with such a drag clip due to their structure.

Therefore, the applicant has already proposed a device for causing the sprag group to follow the outer ring when the full capacity one-way clutch is not in the wedged state, as published in Japanese Utility Model Application No. 62-46838.

The invention of the prior application includes 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 an axial portion and a circumferential portion that hold each sprag. a pair of annular side plates disposed between the sprag end face and the circumferential portion of the retainer, and a radial flange portion on the peripheral edge of one of the pair of annular side plates. This is a one-way clutch provided with a slit cut into the peripheral edge of the flange, and the peripheral edge between the slits is bent toward the outside of the inner and outer rings.

In the above configuration, when the one-way clutch attached to the inner and outer rings is attached to the wheel body, the bent portion of the annular side plate is pressed by the wheel body, and as a result, the annular side plate is held under pressure between both sides of the wheel body and the outer ring. When the outer ring and wheel body rotate, the one-way clutch rotates together due to the frictional force. Therefore, there is no wear between the sprags and the outer ring, and the centrifugal force caused by rotation causes the sprags to float up, causing no friction with the inner ring.

However, with the above configuration, since the bent part is constantly pressed by the wheel body, bending fatigue of the bent part over time reduces the elastic contact force (so-called "sagging"), causing the wheel to follow the outer ring. There is a problem in that the frictional force that causes this is not sufficient. This tendency becomes particularly noticeable when the operating temperature is high.

Means for Solving the Problems The present invention includes a plurality of sprags interposed annularly 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 direction spring that holds each sprag. an annular wire retainer having alternating portions and circumferential portions, and a pair of annular side plates disposed between the sprag end face and the circumferential portion of the retainer; one of the pair of annular side plates; In a one-way clutch having a radial flange portion on the peripheral edge of a side plate, a part of the flange portion is provided with an engaging portion that protrudes inward from a side surface of the outer ring, and has an inclined surface into which the engaging portion fits into the outer ring. The problem was solved by a one-way clutch provided with a recess.

Function The engaging part of the flange of one of the annular side plates fits into the recess with the inclined surface provided in the outer ring, so even when the outer ring rotates without being wedged with the inner ring, the sprag assembly can be inserted through this annular side plate. Rotates along with the outer ring. Therefore, the sprag of a one-way clutch receives centrifugal force by rotating together with the outer ring.
Since the sprags are spaced apart from the outer circumferential surface of the inner ring, the frictional wedge surfaces of each sprag do not slip between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring, so that no wear occurs.

The insertion part that fits into the recess engages the outer ring and brings the sprag assembly along with it, so even if bending fatigue occurs over time due to being squeezed between the wheel and outer ring, it will not bend over time on the inclined surface of the recess. The contact point changes only slightly, and the frictional force does not decrease.

If we look at this kind of sprag tracking mechanism that uses frictional force microscopically, when the sprag wedges the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring, the sprag rolls on the inner circumferential surface of the outer ring and becomes wedged. be. Therefore, the sprag assembly and outer ring must be able to move relative to each other, albeit slightly. In the present invention, the inclined surface of the concave portion allows the deformation of the engaging portion and can absorb a slight amount of movement of the annular side plate.

Embodiment In the annular side plate 12 having the flange portion 20 shown in FIG. 4, three engaging portions 24 are formed at 120° intervals in the circumferential direction by slits 22 cut into the flange portion 20. There is. Engagement part 24
As shown in FIGS. 5 and 8, the outer ring is bent and deformed toward the end surface of the outer ring, and has elasticity.

6 and 7 show the outer ring 13 in which a recess 34 into which the engaging part 24 fits is formed at a position in the circumferential direction where the engaging part 24 comes into contact, and this recess 34 extends from the contact surface 32 of the annular side plate 12. It is formed by sloped surfaces 36, 36 that are gently depressed.

The annular side plate 12 assembled to the sprag assembly 10 shown in FIGS.
When the ring is inserted into the outer ring 13 and the inner ring 14, the flange portion 20 is recessed into the annular stepped portion 38 of the outer ring 13, and the engaging portion 24 is positioned so as to come into contact with the recess 34. Next, the wheel body 15 is attached to the outer ring 13 (FIG. 1), and the flange portion 20 receives a pressing force from the wheel body 15 so that the engaging portion 24 is inserted into the recess 3.
4. As a result, when the outer ring 13 rotates without being wedged with the inner ring, the annular side plate 12
3 and rotate integrally with the outer ring 13, the sprags 16 rise from the inner ring outer peripheral surface 40 and rotate following the outer ring 13. Since the engaging portion 24 comes into elastic contact with the inclined surfaces 36, 36 of the recess 34, when the sprag 16 is not wedged between the inner and outer rings, the engaging portion 24 is slightly deformed by the inclined surfaces 36, 36. You can move slightly within that range.

The amount of protrusion of the engaging portion 24 from the flange portion 20 is
Although it is desirable to set it so that it comes into elastic contact with the inclined surface 36 of the recessed part 34, it does not necessarily need to be in the elastic contact state unless an excessive gap is created. Although the embodiment and the drawings illustrate the recess 34 formed by the inclined surfaces 36, 36, the recess 34 may be formed from an arcuate surface.

Such a sprag following mechanism allows the engaging part to come into elastic contact with the recessed part, and even if the engaging part no longer comes into elastic contact with the recessed part due to bending fatigue in the elasticity of the engaging part over time, the engaging part engages with the recessed part. By doing so, the sprag assembly is attached to the outer ring, thereby lifting the sprag from the outer peripheral surface of the inner ring to prevent wear and abrasion.

Effects of the invention The present invention provides a full-capacity one-way clutch to which a drag grip cannot be attached, in which the side plate is connected to an inclined surface formed on the outer ring by an insertion portion provided at the flange of one of the pair of annular side plates. When the outer ring rotates without being wedged with the inner ring, the sprag group can integrally rotate to follow the outer ring, significantly reducing wear between the inner and outer rings and the sprags. This also improves response performance.

In addition, since the engaging part fits into the recess provided in the outer ring, even if the bending fatigue of the engaging part reduces the elastic contact force to the recess over time, the engagement between the annular side plate and the outer ring will not be released, resulting in improved reliability. A high one-way clutch can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the sprag assembly assembled to the inner and outer rings, and FIG.
The figure is a side view of the sprag assembly, Figure 3 is a cross-sectional view taken along the line 3-3 in Figure 2, Figure 4 is a side view of one annular side plate, and Figure 5 is a cross-sectional view taken along the line 5-5 in Figure 4. , FIG. 6 is a side view of the outer ring, FIG. 7 is a sectional view taken along line 7-7 in FIG. 6, and FIG. 8 is a partial perspective view showing the positioning state of the annular side plate and the outer ring. DESCRIPTION OF SYMBOLS 10... Sprag assembly, 12... One annular side plate, 13... Outer ring, 16... Sprag, 20...
... flange part, 24 ... engagement part, 34 ... recessed part,
36...Slope surface.

Claims (1)

[Scope of Utility Model Registration Claim] 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 an axial portion and circumference that hold each sprag. and a pair of annular side plates disposed between the sprag end face and the circumferential portion of the retainer,
In the one-way clutch in which a radial flange portion is provided on the peripheral edge of one of the pair of annular side plates, the flange portion is provided with an engaging portion that protrudes inward from the side surface of the outer ring, and the engaging portion is provided on the outer ring. A one-way clutch characterized by having a recess having an inclined surface into which the clutch is fitted.