JPH025130Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a one-way clutch used in a rotational force transmission section of an automatic transmission for an automobile or the like.

(Prior Art) A sprag-type one-way clutch, such as that shown in Japanese Utility Model Publication No. 55-34340, is used in various rotational force transmission devices such as automatic transmissions for automobiles. As shown in FIG. 9, sprags 5 . A large number of sprags 5, . . . , 5 are held in an upright position in which both ends are in contact with the outer race 1 and the inner race 2 by a ribbon spring 6 provided between the retainers 3 and 4. This sprag 5 has a cocoon-like shape, and has a diagonal distance
is set larger than the other diagonal distance y that intersects with this, and if the outer race 1 is now rotated in the direction of the arrow a as the drive side, each sprag 5 is in the upright position and the outer race 1 and the inner race 2, the inner race 2 is driven to rotate in the same direction, and conversely, when the outer race 1 is rotated in the direction of arrow b, each sprag 5 is placed in a laid down position, and the outer race 1 and the inner race 2 are rotated. By setting the inner race 2 to a free state, transmission of rotational force to the inner race 2 is prevented.

By the way, both the retainers 3 and 4 and the sprag 5
When a one-way clutch consisting of a ribbon spring 6 and a ribbon spring 6 is assembled between the races 1 and 2 in the opposite direction to the state shown in FIG. 9, the outer race 1 rotates in the direction of the arrow a as described above. Nevertheless, each sprag 5 was laid down and both races 1 and 2 became free, so the rotational force was not transmitted to the inner race 2, and on the contrary, the outer race 1 was rotated in the direction b. In this case, a situation arises in which the inner race 2 is driven to rotate, and the rotational force transmission device incorporating the one-way clutch does not perform the required function. Therefore, in the past, an arrow or the like indicating the installation direction was displayed on the outer retainer of the one-way clutch, but this alone was not able to completely eliminate the above-mentioned installation errors.

Further, as shown in FIG. 10, for example, when a one-way clutch is assembled to the outer race 1, the sprags 5 are held by the ribbon spring 6 to a degree that they do not come off naturally and are in a state of free movement. If the sprag 5 is tilted as shown in the figure, the sprag 5 will collide with the inlet of the outer race 1, making it impossible to assemble the sprag as described above, and the operator will have to manually correct the posture of the sprag 5 while assembling. Workability had deteriorated significantly. In order to avoid this, it is conceivable to form a chamfered portion 1a around the entrance of the outer race 1 as shown by the chain line, and to automatically correct the posture of the sprag 5 while assembling the sprag. The axial dimension l of 1 increases, creating a problem that it is not possible to make it more compact.

(Purpose of the invention) In view of the above points, the present invention reliably prevents installation in the opposite direction when assembling a one-way clutch into the outer race, ensuring that the clutch is always installed in the correct direction, and speeds up the installation process. The purpose is to make it easy.

(Structure of the invention) That is, the present invention holds a large number of sprags at predetermined intervals in the circumferential direction in the outer retainer and the inner retainer, and each sprag is biased in the locking direction by a ribbon spring between both retainers. In a one-way clutch, for example, the sprag is biased by the ribbon spring so that the front end of the sprag is tilted radially relative to the opposite installation direction into the outer race and impinges on the inlet periphery of the race.

(Effects of the invention) According to the invention, not only is the sprag biased in the locking direction by the ribbon spring, but also, for example, when it is assembled into an outer race, the front end of the sprag is turned inward in the direction of assembly. For installation into the inner race, each sprag is biased so that its front end is inclined outward in the direction of installation.For example, when installed into the outer race, each sprag is biased toward the entrance of the outer race. The sprag can be inserted smoothly and quickly without colliding with the sprag or requiring any artificial posture correction work.

For example, if the one-way clutch is installed in the correct direction with respect to the outer race, but if an attempt is made to insert it in the opposite direction,
When the front end of each sprag is installed in the outer race, it always collides with the entrance of the outer race because it is tilted to the outside. The same holds true, and thus errors in the installation direction can be reliably prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the one-way clutch 10 holds a large number of sprags 11...11 in a ring-shaped outer retainer 12 and an inner retainer 13 at equal pitch intervals in the circumferential direction. Both races 1,
This is a configuration in which the robot is held in an upright position in contact with 2.

The ribbon spring 14 is the outer retainer 1
2 and the inner retainer 13, the spring 14 has a ring shape.
As shown in FIG. 3, the sprag fitting holes 15...15 are opened at regular pitch intervals, and the sprag fitting holes 15...15 are opened from the center of the bridging portions 16...16 that partition the sprag fitting holes 15...15 in the circumferential direction. Piece-shaped main biasing part 1
7...17 are respectively projected. When the sprag 11 is fitted into each fitting hole 15, the main biasing portion 17 is engaged with the center of the sprag 11, and always elastically biases the sprag 11 in the upright direction. It's becoming like that.

Further, the ribbon spring 14 is provided with a pair of auxiliary biasing parts 18 and 19, which are also tongue-shaped and protrude from the bridging part 16 on both sides of the main biasing part 17. Of these, one of the auxiliary biasing parts 18 is inclined inward in the radial direction of the ribbon spring 14, and the other auxiliary biasing part 19
are inclined radially outward, and both biasing parts 18,1
The tip of 9 is connected to the fitting hole 1 as shown in Figs.
The sprag 11 is held in the sprag 5 and comes into contact with the lower and upper parts of the sprag 11, respectively. As a result, the sprag 11 has one end 1 as shown in FIG.
A biasing force acts to tilt 1a inward and the other end 11b outward. Incidentally, as shown in FIG. 2, both sides of the outer retainer 12 and the inner retainer 13 are held by side walls 20 and 21.

According to the above configuration, when the one-way clutch 10 is assembled into the outer race 1, the auxiliary biasing portion 18,
If the sprag 11 kept in an inclined position by the sprag 19 is pushed in with the inwardly inclined end 11a as the tip as shown in FIG. This means that the sprag 11 will be inserted smoothly, but if you try to push it in using the end 11b that is inclined outward as shown in FIG. Its insertion is blocked.

Therefore, if the sprag 11 is set so that it is installed in the outer race 1 in the state shown in FIG. 6, which is the normal installation direction, the one-way clutch 10
When an insertion failure occurs as shown in FIG. 7 during installation, it is immediately understood that the installation direction is reversed.
Alternatively, such reverse incorporation would be prevented. When the insertion direction is normal, each sprag 11 can be inserted into the outer race 1 without any artificial posture correction operation, as shown in FIG.

Here, in this embodiment, the ribbon spring 1
4, a main biasing part 17 for biasing the sprag 11 into an upright (locked) position and auxiliary biasing parts 18 and 19 for biasing the sprag 11 into a tilted position were formed separately. It is also possible to use a single projecting piece 25 as the spring 24. That is,
In the case of this projecting piece 25, the central part of the tip is a horizontal part 26, and the parts on both sides thereof are bent parts 27 and 28 twisted in opposite vertical directions, and when these parts come into contact with the sprag, the horizontal part 26 is adapted to apply a biasing force to the sprag in the upright direction, and the bent portions 27 and 28 provide a biasing force in the tilting direction.

In the above description, the one-way clutch 10 is assembled into the outer race 1, but the clutch may be first fitted into the inner race and then assembled into the outer race. In this case, it is sufficient to bias the front end of each sprag radially outward with respect to the direction in which it is fitted to the inner race. Assembly in the opposite direction will be prevented and assembly in the correct direction will be facilitated.

[Brief explanation of the drawing]

Figures 1 to 7 show one embodiment of the present invention.
Fig. 1 is a sectional view of the main part of the one-way clutch, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, Fig. 3 is an enlarged perspective view of the main part of the ribbon spring, and Figs. 3 and 6 and 7 are explanatory diagrams showing the state at the time of assembly into the outer race. FIG. 8 is a perspective view of essential parts showing another embodiment of the ribbon spring. Further, FIG. 9 is a sectional view of a main part showing the general structure of a one-way clutch, and FIG. 10 is a sectional view of a main part showing problems of the conventional clutch. 1... Outer lace, 2... Inner lace, 1
0...One-way clutch, 11...Sprag, 12
...Outer retainer, 13...Inner retainer,
14, 24... Ribbon spring.

Claims (1)

[Scope of utility model registration request] A one-way clutch that is interposed between an outer race and an inner race and transmits rotational force in only one direction from one of both races to the other, and a ring-shaped outer retainer and inner retainer located between the two races. A plurality of sprags are held in both retainers at predetermined pitch intervals in the circumferential direction, and are provided between the two retainers to lock or free the outer race and the inner race according to the upright or down position of the sprags. and a ribbon spring that biases each sprag in the locking direction, and the front end of the sprag is inclined in the radial direction with respect to the opposite installation direction with respect to either the outer race or the inner race. A one-way clutch characterized in that the clutch is biased by the ribbon spring so as to collide with the periphery of the entrance of the race.