JPH09152006A - Stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the sort and the number of parts, simplify combination construction of mutual parts, and relax required dimensional accuracy, by providing a one-way clutch of ratchet construction on the inner circumferential side of an inner cylinder made of resin. SOLUTION: This stator is concentrically integratedly formed out of an inner-cylinder 1, a blade 2, and an outer cylinder 3 made of phenol resin as forming material, and provided with a one-way clutch 4 of ratchet construction on the inner circumferential side of the inner cylinder 1. This one-way clutch 4 of ratchet construction is supported with a pocket plate 5, a notch plate 6 relatively rotatably arranged against the pocket plate 5, and a necessary number of struts and snap rings 8 engaged with the notch plate 6 in one rotational direction. Hereby, a retainer and a ribbon spring which are used for a customary one-way clutch are eliminated so as to reduce the sort and the number of parts, and the combination construction is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator used for a torque converter of an automatic transmission for an automobile.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a stator having a one-way clutch 52 having a sprag structure provided on the inner peripheral side of a resin inner cylinder 51 has been known. The outer race 53, which is a component of the clutch 52, is integrally held by insert molding on the inner peripheral side of the inner cylinder 51 as shown in FIG. 63-18050 or Japanese Utility Model Laid-Open No. 3-20754).

However, this stator has the following problems.

One-way clutch 5 having a sprag structure
A plurality of sprags 55 are circumferentially arranged between the outer race 53 and the inner race 54, and further retainers 56 and 57 for holding the sprags 55 and a ribbon spring 58 for urging the sprags 55. Due to the provision of and, there are many types and a large number of parts, and the structure for combining the parts is complicated. Therefore, there is a problem that it takes a lot of time and labor to assemble it. In order to ensure smooth operation of the sprag 55, the one-way clutch 52 having a sprag structure has strict dimensional accuracy with respect to the inner diameter of the outer race 53, the outer diameter of the inner race 54, and the concentricity of both races 53, 54. There is a request. Therefore, it is quite difficult to meet this demand, and it becomes more difficult to meet this demand when the resin shrinks as described later.

Even if the rigid outer race 53 having a cylindrical shape is integrally held on the inner peripheral side of the resin inner cylinder 51 by insert molding, the shrinkage of the inner cylinder 51 cannot be completely suppressed. When the inner cylinder 51 contracts, the outer race 53 deforms. The inner cylinder 51 is formed by integrally molding an annular plate part 51b toward one end in the axial direction of the cylindrical part 51a or in the vicinity thereof, and has an approximately L-shaped cross section, so that the plate part 51b is integrally formed. The molded one end in the axial direction shrinks more than the other end in the axial direction. Therefore, as shown by the chain line in FIG. 8, the outer race 53, which is originally cylindrical in shape, is deformed into a taper shape, which may hinder the smooth operation of the sprag 55 arranged on the inner peripheral side thereof. As shown in FIG. 9, in the one-way clutch 52 having the sprag structure, the load L generated at the time of its engagement mainly acts in the radial direction of the stator, and the load L is applied to one of the radial directions, that is, to the outer peripheral side of the outer race 53. As described above, the inner cylinder 51 made of resin, which is relatively brittle in terms of strength, is located. Therefore, if the outer race 53 is deformed in the outer peripheral direction by being pushed by this load L, a large load is applied to the inner cylinder 51 (the outer race 53 is deformed in the outer peripheral direction and the inner cylinder 51 is pressed in the same direction). When the torque is applied in this state, a large circumferential tensile stress is generated in the inner cylinder 51, which is not good from the viewpoint of the durability of the resin).

[0006]

In view of the above points, the present invention has a smaller number of types and a smaller number of parts as compared with the above-described stator having a one-way clutch of sprag structure, and has a simple structure for combining parts. It is also an object of the present invention to provide a resin stator that has moderate dimensional accuracy and is easy to assemble and manufacture. Further, in addition to this, it is possible to effectively suppress the contraction of the resin inner cylinder, and thereby to provide a stator capable of preventing malfunction of the stator due to the contraction. To aim. In addition to this, it is an object of the present invention to provide a stator in which the load generated when the one-way clutch is engaged does not act in the radial direction of the stator and thus does not place a heavy load on the resin inner cylinder. .

[0007]

In order to achieve the above object, in the stator according to claim 1 of the present invention, a one-way clutch having a ratchet structure is provided on the inner peripheral side of an inner cylinder made of resin. According to a second aspect of the present invention, in the stator of the first aspect, a notch plate of a one-way clutch also having a substantially L-shaped cross section is integrally formed by insert molding on the inner peripheral side of an inner cylinder having a substantially L-shaped cross section. Decided to hold. Further, claim 3 of the present invention
The stator according to claim 1 is the stator according to claim 1 or 2, wherein the component force of the load generated when the one-way clutch is engaged acts in the circumferential direction and the axial direction of the stator.
The engaging recess that engages with the strut is provided on the axial end surface of the notch plate.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the stator according to claim 1 of the present invention having the above-described structure, it is conceivable that the one-way clutch having a ratchet structure has the following form.

First example: a pocket plate, a notch plate arranged to be rotatable relative to the pocket plate, and a required number of struts supported by the pocket plate and engaging with the notch plate in one rotation direction. Second example: a pocket plate, a notch plate arranged to be rotatable relative to the pocket plate, and a required number of struts integrally formed with the pocket plate and engaging with the notch plate in one rotation direction. Third example: In the first example or the second example, the notch plate is integrally formed with the resin inner cylinder of the stator body. Fourth example: In the first or second example, the pocket plate is integrally formed with the resin inner cylinder of the stator body.

As shown in these embodiments, the ratchet type one-way clutch does not have a retainer or a ribbon spring as seen in the sprag type one-way clutch described above, and therefore, the types of parts corresponding to these parts are not provided. It is possible to simplify the combination structure while reducing the number and. Also, it is sufficient that the strut engages with the notch plate in one rotation direction,
Since there are no parts that operate in a complicated and highly accurate manner, such as sprags that repeatedly stand up and down between the outer race and the inner race, the dimensional accuracy required for each part can be made relatively gentle.

In addition to this, like the stator according to claim 2 of the present invention having the above-mentioned structure, a ratchet structure having a substantially L-shaped cross section is also provided on the inner peripheral side of the inner cylinder having a substantially L-shaped cross section. When the notch plate of the one-way clutch is integrally held by insert molding, as described above, the annular plate portion is provided at one end in the axial direction of the tubular portion or in the vicinity thereof toward the inner circumferential direction. The inner cylinder tends to largely contract on the one axial end side, but is effectively suppressed by the annular plate portion provided on the same axial one end side of the notch plate. That is, one end portion in the axial direction of the inner cylinder, which may cause a large contraction, is reinforced by providing an annular plate portion at the same one end portion in the axial direction of the notch plate.

In addition to this, like the stator according to claim 3 of the present invention having the above-mentioned structure, the component force of the load generated when the one-way clutch is engaged acts in the circumferential direction and the axial direction of the stator. As described above, when the engaging recess that engages with the strut is provided on the axial end surface of the notch plate, the load generated when the one-way clutch having the ratchet structure is engaged is prevented from acting in the radial direction of the stator. .

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings.

First Embodiment: As shown in FIG. 1, the stator according to the first embodiment is one in which an inner cylinder 1, a blade 2 and an outer cylinder 3 are concentrically integrally molded by using phenol resin as a molding material. The ratchet one-way clutch 4 is provided on the inner peripheral side of the inner cylinder 1. The ratchet one-way clutch 4 is a component of the pocket plate 5 and the relative rotation with respect to the pocket plate 5. A notch plate 6 that is movably arranged, a required number of struts 7 (see FIG. 2 or FIG. 3) supported by the pocket plate 5 and engaged with the notch plate 6 in one rotation direction, and a snap ring 8.

The inner cylinder 1 is formed by integrally molding an annular plate portion 1b toward one end in the axial direction of the tubular portion 1a (upper end in the drawing) or in the vicinity thereof, and has a cross section (half cut section) approximately L.
The plate portion 1b is formed with a required number of notches 1c for introducing lubricating oil in a radial shape, and the notch plate 6 made of a rigid material such as metal having an annular shape is provided on the inner peripheral side of the tubular portion 1a. A pocket plate 5 made of a rigid material such as a metal, which is also integrally ring-shaped, is integrally held by insert molding, and has an annular shape.

The notch plate 6 is, like the inner cylinder 1, integrally formed with an annular plate portion 6b toward one end in the axial direction of the tubular portion 6a or in the vicinity thereof in the inner circumferential direction, and is formed into a substantially L-shaped cross section. The plate portions 1b and 6b are in contact with each other, and the L-shape is arranged in the same direction as the inner cylinder 1.

First, the pocket plate 5 is provided with an annular large diameter portion 5a rotatably arranged on the inner peripheral side of the cylindrical portion 6a of the notch plate 6, and one end side in the axial direction of the large diameter portion 5a. Further, an annular small diameter portion 5b arranged on the inner peripheral side of the plate portion 6b of the notch plate 6 is integrally formed, and an annular small diameter portion 5c is integrally formed on the end surface on the opposite side of the large diameter portion 5a. Also, on the inner peripheral surface of this pocket plate 5,
A spline engagement portion 9 is provided.

As shown in FIG. 2, a support recess 10 for supporting the strut 7 is required on the axial end surface 5d of the large diameter portion 5a of the pocket plate 5 which is axially opposed to the plate portion 6b of the notch plate 6. The support recesses 10 are arranged in an equal number, and each of the support recesses 10 is provided with one strut 7 having an appropriate elasticity, which is erected obliquely in the circumferential direction. Further, as shown in FIG. 3, opposite to this, engaging recesses 11 that engage with the struts 7 in one rotation direction are provided on the axial end surface 6c of the plate portion 6b of the notch plate 6 in a required number of equal distributions. The strut 7 and the engaging recess 1
1 and 2 are combined to provide a ratchet structure that limits the relative rotation of the notch plate 6 and the pocket plate 5 in one rotation direction and allows the relative rotation in the opposite direction.

The tip portions 7a of the struts 7 engage with each other inside the engaging recesses 11 when the notch plate 6 and the pocket plate 5 start to rotate relative to each other in one rotation direction. Is provided with a substantially vertical engagement wall portion 11a for limiting the rotation, and when the notch plate 6 and the pocket plate 5 relatively rotate in opposite directions, the strut 7 is pressed to rotate the rotation. The inclined pressing wall portion 11b is provided to allow the above.

The stator having the above structure is manufactured by the following procedure.

That is, first, when molding a resin stator main body composed of the inner cylinder 1, the blade 2 and the outer cylinder 3, the notch plate 6 is incorporated into the cavity space of the mold and insert molding is carried out. The insert molded product shown in FIG. 4 is molded. Then, the pocket plate 5 in which the required number of struts 7 are assembled in the supporting recesses 10 is formed.
Is inserted into the inner peripheral side of the notch plate 6 from the other end side in the axial direction, and the snap ring 8 is fitted into the annular mounting groove 6d provided in advance on the inner peripheral surface of the tubular portion 6a of the notch plate 6 to insert the pocket plate. Keep 5 in place.

According to the stator having the above structure, the following operational effects can be obtained.

The retainer 56 as seen in the one-way clutch 52 of the sprag structure according to the above-mentioned conventional example,
Since there is no 57 or ribbon spring 58, it is possible to reduce the type and number of parts for these parts and to simplify the combined structure. Therefore, the assembly of the stator can be made easier than ever before. The one-way clutch 4 having a ratchet structure allows the strut 7 to engage with the engaging recess 11 even if there are some dimensional errors in the inner diameter of the notch plate 6, the outer diameter of the pocket plate 5, the concentricity of both plates 5, 6, and the like. On the other hand, if it engages in one rotation direction, it operates reliably as a ratchet. Therefore, it is possible to make the dimensional accuracy required for each component relatively gentle, which makes the manufacture of the stator easier than ever.

A resin inner cylinder 1 having a substantially L-shaped cross section
Since the notch plate 6 made of a rigid material, which also has a substantially L-shaped cross section, is integrally held by insert molding on the inner peripheral side of the, it is possible to effectively suppress the contraction of the inner cylinder 1. Thus, the deformation of the notch plate 6 can be effectively suppressed. Therefore, for example, it is possible to prevent the defect that the notch plate 6 is deformed and bites the pocket plate 5, and the malfunction of the one-way clutch 4 or the stator occurs due to the contraction of the inner cylinder 1. Can be prevented. Notch plate 6 made of a rigid material having a substantially L-shaped cross section
Is capable of maintaining the same strength even when the cylindrical portion 6a has a smaller radial thickness than a cylindrical material made of the same material. Therefore, it is conceivable to increase the radial thickness of the tubular portion 1a of the resin-made inner cylinder 1 by the amount corresponding to the reduction of the radial thickness of the tubular portion 6a, thereby increasing the strength of the inner cylinder 1. You can An engaging recess 11 for engaging the strut 7 is provided on the axial end surface 6c of the notch plate 6, and as shown in FIG. 3, a component force L ₂ of the load L ₁ generated when the one-way clutch 4 is engaged, Since L ₃ acts in the circumferential direction and the axial direction of the stator, the load L ₁ does not act in the radial direction of the stator (the direction orthogonal to the paper surface in the drawing). Therefore, it is possible to prevent the notch plate 6 from being deformed in the outer peripheral direction due to the load L ₁ and to give a large load to the resin inner cylinder 1, and to provide a stator having excellent durability of the resin portion. be able to.

The structure of the stator according to the first embodiment can be modified as follows.

Second Embodiment: As shown in FIG. 5, the notch plate 6 of the one-way clutch 4 having a ratchet structure having a substantially L-shaped cross section is made of resin, and the notch plate 6 is integrated with the inner cylinder 1. Mold. As a result, the effects according to the first embodiment described above can be further promoted, and the effects and effects can be maintained as they are.

Third Embodiment: As an intermediate plan between the first embodiment and the second embodiment, as shown in FIG. 6, the notch plate 6 of the one-way clutch 4 of ratchet structure having a substantially L-shaped cross section. Of these, only the tubular portion 6a is made of resin and is integrally formed with the inner cylinder 1. The annular plate portion 6b is made of a rigid material such as metal, and the tubular portion 1 of the inner cylinder 1
It is integrally held on the inner peripheral side of a by insert molding, and an engaging recess (not shown) is provided on the axial end surface 6c of the plate portion 6b made of a rigid material. As a result, it is possible to obtain substantially the same effects as the effects according to the first embodiment described above, and it is possible to maintain the effects and. In addition, in order to enhance the bonding force with the inner cylinder 1, it is preferable to provide a flat knurled portion (not shown) on the outer peripheral surface of the rigid plate portion 6b.

[0028]

The present invention has the following effects.

First, claim 1 of the present invention having the above structure
The stator according to has the following effects. Since there is no retainer or ribbon spring as found in the conventional one-way clutch having the sprag structure, it is possible to reduce the types and the number of parts for these parts and simplify the combination structure. Therefore, the assembly of the stator can be made easier than ever before. The ratchet one-way clutch allows the strut to engage with the notch plate in one rotation direction even if there are some dimensional errors in the inner diameter of the notch plate, the outer diameter of the pocket plate, and the concentricity of both plates. If it works, it will work as a ratchet. Therefore, it is possible to make the dimensional accuracy required for each component relatively gentle, which makes the manufacture of the stator easier than ever.

In addition to this, the stator according to the second aspect of the present invention having the above-mentioned structure has the following effects. Since the notch plate of the one-way clutch of the ratchet structure which also has a substantially L-shaped cross section is integrally held by insert molding on the inner peripheral side of the inner cylinder having a substantially L-shaped cross section, the inner cylinder is effectively contracted. It is possible to suppress the deformation of the notch plate effectively. Therefore, for example, it is possible to prevent the problem that the notch plate is deformed and bites against the pocket plate, and the malfunction of the one-way clutch or the stator due to the contraction of the inner cylinder is prevented. be able to. The notch plate having a substantially L-shaped cross section can maintain the same strength as the notch plate made of the same material, even if the thickness of the tubular portion in the radial direction is reduced. Therefore, the strength of the inner cylinder can be increased by increasing the radial thickness of the tubular portion of the resin inner cylinder by the amount corresponding to the reduction in the radial thickness of the tubular portion.

In addition to this, the stator according to claim 3 of the present invention having the above-mentioned structure has the following effects. Engagement recesses that engage with the struts are provided on the axial end surface of the notch plate so that the component force of the load generated when the one-way clutch is engaged acts in the circumferential direction and axial direction of the stator. Therefore, this load does not act in the radial direction of the stator. Therefore, the notch plate is deformed in the outer peripheral direction by being pushed by this load,
It is possible to prevent a large load from being applied to the resin inner cylinder, and it is possible to provide a stator having excellent durability of the resin portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stator according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a pocket plate assembled with struts according to the embodiment.

FIG. 3 is a partial sectional view of a one-way clutch having a ratchet structure according to the embodiment.

FIG. 4 is a sectional view of an insert-molded product according to the same embodiment.

FIG. 5 is a sectional view of a stator according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a stator according to a third embodiment of the present invention.

FIG. 7 is a half-cut sectional view of a stator according to a conventional example.

FIG. 8 is a sectional view of an insert-molded product according to the conventional example.

FIG. 9 is a partial sectional view of a one-way clutch having a sprag structure according to the embodiment.

[Explanation of symbols]

 1 Inner cylinder 1a, 6a Cylindrical part 1b, 6b Plate part 1c Notch part 2 Blade 3 Outer cylinder 4 One way clutch 5 Pocket plate 5a Large diameter part 5b, 5c Small diameter part 5d, 6c Axial end face 6 Notch plate 6d Mounting groove 7 Strut 7a Tip part 8 Snap ring 9 Spline engaging part 10 Support concave part 11 Engaging concave part 11a Engaging wall part 11b Pressing wall part

Claims (3)

[Claims] 1. A stator characterized in that a one-way clutch (4) having a ratchet structure is provided on the inner peripheral side of a resin inner cylinder (1). 2. The stator according to claim 1, wherein the notch plate (6) of the one-way clutch (4) also having a substantially L-shaped cross section is insert-molded on the inner peripheral side of the inner cylinder (1) having a substantially L-shaped cross section. The stator is characterized in that it is integrally held by. 3. The stator according to claim 1, wherein the load (L) generated when the one-way clutch (4) is engaged.
_The engaging recess (11) that engages with the strut (7) is provided in the shaft of the notch plate (6) so that the component force (L ₂ ) (L ₃ ) of ₁ ) acts in the circumferential direction and the axial direction of the stator. A stator provided on the end face (6c) in the direction.