JPH07113384B2 - One way clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sprag type one-way clutch comprising a groove ball bearing provided with a retainer, wherein the retainer is within the range of the ball of the groove ball bearing. It is divided into two at right angles to the axis of the ball bearing, and both halves formed by the two halves of the cage are within the range of the race ring edge and
-As seen in the circumferential direction-between the balls radially open to receive at least two sprags each of which can be tilted about an axis parallel to the axis of the groove ball bearing and thereby by a race ring edge It has limited pockets, the width of the pockets measured parallel to the axis of the groove ball bearing corresponds to the width of the sprags, and the length of each pocket in the circumferential direction of the cage. Corresponds to the number of sprags received in the pocket, the sprags being loaded in the clamping direction by a compression spring fitted in a notch in the circumferentially facing pocket wall of one of the cage pockets. Contacting the race ring edge and being supported by one another via a projection parallel to the axis, said projection being on one side of the sprag, radially in the circumferential direction of the compression spring and the pocket of the cage. Direction It was about of the type which is arranged between the projecting portion of the pocket wall.

Known one-way clutches of the above type consisting of commercially available groove ball bearings require very little space requirements,
Moreover, a high torque transmission is possible, since a plurality of sprags are arranged in the sprag / reception pocket of the cage.

However, in the known one-way clutch, the protrusion parallel to the axis of the sprag is provided in the pocket wall of the pocket of the cage in the radial direction of the groove ball bearing on a side different from the side on which the compression spring is arranged. The sprags which are arranged directly adjacent to, ie close to, the projections and therefore contact the compression springs are loaded in the direction of the tightening position with a greater force than the sprags which contact the projections of the cage. become. As a result, each sprag located in the pocket of the cage causes different support action in the tightened state (connected state) of the one-way clutch, which causes the race ring of the groove ball bearing to be uneven. Not only will it be loaded, but each sprag will wear out differently, and the magnitude of the transmission torque corresponding to the number of sprags will become small.

Furthermore, in known one-way clutches, the side opposite to the sprag parallel to the axis of the sprag extends radially in the groove ball bearing, and thus more than two sprags in the cage pocket. In the case of arranging, the load in the tightening direction is not applied to the sprags located in the middle, or only slightly, and as a result, the sprags located in the middle cause only slight torque transmission. Stop getting involved.

The object of the invention is therefore to improve a one-way clutch of the type mentioned at the outset such that the sprag contacting the compression spring and the sprag contacting the projection of the cage are of equal spring action in the tightening direction. The sprag, which is located in the middle and is located in the middle, is also loaded by the moment that pushes the sprag in the tightening direction.

In order to solve the above problems, in the configuration of the present invention, the protrusion parallel to the axial line of the sprag is arranged at the center between the compression spring and the protrusion of the pocket wall of the retainer,
From the adjacent sprags on both sides of one sprag to the radial direction of the groove ball bearing in the central area where the side surface opposite to the projection is at least in the radial direction of the sprag and in contact with the projection of the adjacent sprag. The support force exerted on one sprag is configured to incline at an angle forming a torque capable of loading the one sprag into the tightened position.

According to the above configuration of the invention, it is ensured that the sprags which come into contact with the compression spring and the sprags which come into contact with the projections of the cage are loaded with the same force in the clamping direction, so that both sprags switch to the clamping position. In doing so, they exert the same amount of supporting action and are consumed evenly during free rotation, thus avoiding uneven loading (supporting) of the race ring.

The above-mentioned effects are also applicable to the sprags located in the middle when, for example, three sprags are arranged in each pocket, since the side surface of the sprag on the side opposite to the side having the protrusion is in the tightening direction. This is because it is inclined so that effective torque is generated, and the magnitude of such torque is defined by the inclination angle of the inclined side surface.

Usually, the sprags are mechanically filled in the cage. For this purpose, in an advantageous embodiment of the invention, the sprag has a mark projection on the side of the projection parallel to the axis, which is radially outside the projection, such a mark projection being a sprag. Allows reliable positioning without disturbing the function of.

Furthermore, in an advantageous embodiment of the invention, the compression spring is arranged radially outside and the projection of the cage is arranged radially inside. This is because the compression spring is the easiest to install.

Next, embodiments of the present invention will be specifically described with reference to the drawings.

The one-way clutch shown in FIG. 1 has an outer race ring 1
And an inner race ring 2, a ball 3 and a ball cage 4 with a groove ball bearing. The cage 4 is arranged between the race rings 1 and 2 and holds the balls 3 in the range of the balls 3 at right angles to the axis of the groove ball bearing, and in the embodiment shown in FIG. It is divided into two along a plane that passes through the center point of.

The retainer 4 holds the sprags 6 of the one-way clutch in order to hold the sprags 6 of the one-way clutch between the adjacent balls 3 when viewed in the circumferential direction of the one-way clutch, near the race ring edges 25 and 26 of the race rings 1 and 2. It has a pocket 5 in which three sprags 6 are arranged side by side in the circumferential direction, the compression spring 11 being arranged on one side.
In the clamping direction and is supported on the other side by a projection 12 on the pocket wall of the pocket of the cage 4. The sprag 6 has an outer tightening surface 7 and an inner tightening surface 8.
And has two sides 9, 10. In the illustrated embodiment, the side surface 10 of the sprag opposite the compression spring has a projection 13 in the center between the compression spring 11 and the projection 12 of the cage 4 when viewed in the radial direction. On the other hand, the side surface 9 has a radius of the one-way clutch so that the sprag 6 located in the middle is loaded in the clockwise direction in FIG. 1 by the moment in the tightening direction of the sprags based on the force generated on both side surfaces. It is configured to be inclined with respect to the direction.

The compression spring 11 is arranged in the pocket 5 of the cage 4 in the notch 14 in the pocket wall on the side opposite to the projection 12, and the adjacent sprag 6 (first from the left side in FIG. 1) 6 Is applied radially outward in the tightening direction, whereas the protrusion 12 of the retainer 4 abuts the adjacent (third in FIG. 1) sprag 6 radially inward, and the compression spring It supports the power generated by 11.

The action of the one-way clutch is as follows: During free rotation of the one-way clutch (rotation without force transmission between the race rings), the inner race ring 2 is in the first position.
In the figure, the outer race ring 1 stops by rotating in the clockwise direction, or rotates more slowly in the clockwise direction than the inner race ring 2, or rotates in the opposite direction to the clockwise direction. In this case, the frictional force generated between the race ring edges 25 and 26 of the race rings 1 and 2 and the tightening surfaces 7 and 8 of the sprags 6 causes the sprags to rotate in the direction opposite to the clockwise direction, that is, in the disconnection direction. Rotate against the action of the compression spring 11. This causes the clamping surfaces 7,8 of the sprag 6 to slide along the race ring edges 25,26 of the race rings 1,2.

When the rotation speed of the outer race ring 1 in the clockwise direction becomes higher than the rotation speed of the inner race ring 2 in the clockwise direction, the sprag 6 is compressed by the compression spring 11 by the frictional force acting on the tightening surfaces 7, 8 of the sprag 6. It is rotated clockwise with the help of the above and is tightened between the race rings 1 and 2 to connect the race rings 1 and 2 to each other.

The compression spring 11 acts so that the tightening surfaces 7 and 8 of the sprag 6 always come into contact with the race ring edges 25 and 26 of the race rings 1 and 2 during free rotation, whereby the sprag 6 is brought into the connecting position without delay. Will be migrated.

The force exerted on the left-side sprag 6 in FIG. 1 by the compression spring 11 is applied to the adjacent (second in FIG. 1) sprags via the axially parallel projections 13 provided on the side surface 10 of the sprag. And thus in the radial direction inside the pocket 5 of the retainer 4 via the last (right side in FIG. 1) sprag.
It is supported by the projections 12 on the pocket wall.

FIG. 3 shows a set of sprags 17 located between the race surfaces 15, 16 of a race ring (not shown).
17 is also loaded on the one hand by a compression spring, which is shown diagrammatically by the arrow 18, and is supported on the other hand by a projection, which is shown diagrammatically by the arrow 19 of the cage. Unlike the sprag 6, the sprag 17 has a mark projection 21 radially outside of the central projection 20. By this mark projection, the sorting and adjusting device determines the sprag for the cage filling automatic machine. Place and position in the form of.

Further, FIG. 3 shows the supporting forces 22 and 23 which are generated in a pair with the sprag located in the middle, and the supporting force acts perpendicularly on the inclined side surface of the sprag to tighten the sprag in the tightening direction. That is, the load is applied in the connecting direction of the one-way clutch.

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view taken along the line I-I of FIG. 2 of the first embodiment, and FIG. 2 is a cage of the first embodiment, The side view seen in the direction of the arrow in FIG. 1 and FIG. 3 are end views of the second embodiment. 1 and 2 ... Race ring, 3 ... Ball, 4 ... Retainer,
5 ... Pocket, 6 ... Sprag, 7 and 8 ... Tightening surface, 9 and 10 ... Side surface, 11 ... Compression spring, 12 and 13 ...
Protrusions, 14 …… notches, 15 and 16 …… race surface, 17 ……
Sprags, 18 and 19 ... Arrows, 20 ... Projections, 21 ... Mark projections, 22 and 23 ... Supporting force

Claims (3)

[Claims] 1. A sprag type one-way clutch, comprising a groove ball bearing provided with a cage (4), wherein the cage (4) is within the range of the ball (3) of the groove ball bearing. It is divided in two at right angles to the axis of the groove type ball bearing, and both halves formed by the two halves of the cage are within the range of the race ring edge (25,26; 15,16). And-in the circumferential direction-to receive between the balls (3) at least two sprags (6, 17) each tiltable about an axis parallel to the axis of the groove ball bearing. Has a pocket (5) which opens radially to and is confined there by the race ring edges (25,26; 15,16), parallel to the axis of the groove ball bearing of the pocket (5) The width measured on the corresponding to the width of the sprag (6,17),
And the length of each pocket (5) in the circumferential direction of the cage corresponds to the number of sprags (6,17) received in the pocket, and the sprags (6,17) correspond to the pockets of the cage. Loaded in the tightening direction by a compression spring (11, 18) fitted in one circumferentially facing pocket wall notch (14) and in contact with the race ring edge (25, 26; 15, 16) In addition, the projections (13, 20) which are parallel to each other are supported by one another, and the projections are radially arranged on one side of the sprag (6, 17) in the radial direction of the compression spring (11, 18) and the cage. In the type that is arranged between the protrusions (12, 19) of the pocket wall facing the other circumferential direction of the pocket, the protrusions (13, 20) parallel to the axis of the sprag (6, 17) are Compression springs (11,18) and cage pocket projections (12,19)
Is located in the center between and, and the side surface (9,24) of each sprag (6,17) opposite to the protrusion (13,20) is at least in the radial direction of the sprag (6,17).
Adjacent sprags (6,17) on both sides of one sprag (6,17) with respect to the radial direction of the groove-shaped ball bearing in the central range in contact with the protrusions (13,20) of the adjacent sprags (6,17). , 17) to the one sprag (6, 17) by a supporting force (22, 23), which is inclined at an angle to form a torque capable of loading the one sprag to a tightening position. One-way clutch that is characterized by being. 2. A projection (20) in which the sprag (17) is parallel to the axis.
The one-way clutch according to claim 1, further comprising a mark protrusion (21) on a side surface on a side where the mark is provided, on a radially outer side of the protrusion. 3. A one-way clutch according to claim 1, wherein the compression spring is arranged radially outside and the protrusion of the cage is arranged radially inside.