JPH0798045A - Internal ring gear and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide an internal ring gear which can be simply manufactured at low cost although a ring gear main body and a flange are surely combined together in the axial direction and the circumferential direction, and the manufacture. CONSTITUTION:A spigot joint part 16b is formed adjacent to the internal teeth on one side end part of a ring gear main body 16, and cutout parts 17b are formed on the outer circumferential-face 17a of a flange 17. By caulking the extreme end part of the spigot joint part in the condition fitting the flange into the spigot joint part, the flange 7 is sandwiched between a step part (b) and a caulked part (f), and a part (g) of the material of the spigot joint part flows in the cutout parts 17b so as to bear the torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal ring gear in a planetary gear device used in an automatic transmission or the like, and more particularly to a structure for connecting a main body of the internal ring gear and a flange and a method for manufacturing the structure.

[0002]

2. Description of the Related Art Generally, a planetary gear unit is used in an automatic transmission, and the planetary gear unit includes an internal ring gear that is supported by being connected to a flange. For example, as shown in FIG. 4, the FR automatic transmission 1
Is equipped with a Simpson type planetary gear unit 5 including a front planetary gear 2 and a rear planetary gear 3, and the front and rear planetary gears 2 and 3 have internal ring gears 6 and 7, respectively. A flange 9 is welded to the gear body of the front internal ring gear 6, and a flange 10 is joined to the gear body of the rear internal ring gear 7 to prevent the rear internal ring gear 7 from being pulled out by a snap ring.

That is, as shown in detail in FIG. 5, in the internal ring gear 7, the end portions of the internal teeth 8a formed on the inner peripheral surface of the gear body 8 are partially cut to form a stepped portion b. At the same time, the snap ring concave groove 8b is formed in the scraped low tooth portion a. Then, the flange 10 having teeth 10a on the outer periphery is engaged with the low tooth portions a of the ring gear body 8 and fitted from the end of the ring gear body 8, and the snap ring 11 is inserted into the groove 8b. As a result, the flange 10 is sandwiched between the step b and the snap ring 11 and is integrally connected to the ring gear body 8.

On the other hand, as shown in detail in FIG. 6, the internal ring gear 6 has a flange 9 on one end of the gear body 12.
Are welded by an electron beam and are integrally connected.

[0005]

By the way, the gear main body 8 and the flange 1 are formed by the engagement of the teeth and the snap ring.
The connection of 0 requires gear cutting on the entire outer periphery of the flange, and also needs to form a snap ring groove 8b in the gear body 8, and also requires deburring work for these gear bodies. 8 and the flange 10 alone increase the cost, and the snap ring 11 is also required, which increases the cost of the internal ring gear 7.

On the other hand, the coupling of the gear body 12 and the flange 9 by welding has a high processing cost due to the fact that the electron beam welding machine is expensive, and is related to the occurrence of welding defects such as cracks. Then, it is difficult to apply high carbon steels to the ring gear body 12 and the flange 9.

Therefore, according to the present invention, the ring gear main body and the flange are joined by plastic deformation so that the ring gear main body and the flange are securely joined together in the axial direction and the circumferential direction, but at the same time, the internal structure can be easily manufactured at low cost. An object of the present invention is to provide a ring gear and a manufacturing method thereof.

[0008]

A first invention is an internal ring gear (15) comprising a ring gear body (16) and a flange (17) coupled to the ring gear body (16). Has a spigot part (16b) adjacent to the internal tooth (16a), and the flange (1
7) has a predetermined number of notches (1) on its outer peripheral surface (17a).
7b), and by crimping (F) the tip of the spigot part (16) with the flange (17) fitted to the spigot part (16b), a stepped part (comprising the end faces of the internal teeth) is formed. The flange (17) is sandwiched between the b) and the crimped portion (f), and a part (g) of the material of the spigot portion flows into the cutout portion (17b) and engages with the cutout portion (17b). , In the internal ring gear.

An internal ring gear (15) for connecting the flange (17) to the ring gear body (16).
Of the ring gear body (16), a spigot portion (16b) is formed adjacent to an inner tooth at one end of the ring gear body (16), and a notch ( 17b) and forms the spigot part (16
By fitting the flange (17) to (b) and crimping the tip of the spigot portion in this state, the step (b) formed by the end faces of the internal teeth and the crimping portion (f) are abutted. While sandwiching the flange (17), a part (g) of the material of the spigot part is caused to flow into the cutout part (17b) to couple the ring gear body (16) and the flange (17). A feature of the present invention is a method for manufacturing an internal ring gear.

A second aspect of the present invention is a ring gear main body (2
In the internal ring gear (20) formed by connecting the flange (22) to the ring gear body (2)
1) is provided with an inlay portion (21b) adjacent to an inner tooth and having an uneven shape (i) on its inner peripheral surface at one end thereof, and the flange (22) is provided on the inlay portion (21b). By caulking (F) the tip of the spigot in the state where the flange is fitted, the flange (22) is provided between the step (b) formed by the end faces of the internal teeth and the caulking (f).
And the concave and convex shape (i) is embedded in a part (j) of the flange (k) while sandwiching.

An internal ring gear (20) for connecting the flange (22) to the ring gear body (21).
A spigot part (21) having a concavo-convex shape (i) consisting of a tooth bottom (h) portion adjacent to an internal tooth (21a) at one end of the ring gear body (21).
Then, the flange (22) is fitted to the spigot portion (21b), and in this state, the tip of the spigot portion is crimped (F) to form a stepped portion (b) formed of end faces of the internal teeth. ) And the caulking portion (f), the flange (2
2) is sandwiched, and the concavo-convex shape (i) is made to penetrate into a part (j) of the flange (k) to couple the ring gear main body (21) and the flange (22). There is a method for manufacturing an internal ring gear.

The reference numerals in parentheses are for symmetry with the drawings, but do not limit the structure of the present invention.

[0013]

As described above, in the internal ring gear according to the first aspect of the present invention, the flange is clamped between the step portion formed by the end faces of the inner teeth and the caulking portion, and is integrally coupled in the axial direction. In addition, since a part of the material of the spigot part flows into the notch part of the flange and is integrally connected in the circumferential direction, the internal ring gear is surely secured in the axial direction and the radial direction. While being supported, the torque can be reliably transmitted.

Further, it is sufficient to form a spigot portion on the ring gear main body and form a notch portion at the same time as punching the flange by press working, for example, gear cutting processing on the flange and a snap ring groove on the ring gear main body. The internal ring gear can be manufactured at a significantly reduced cost in combination with the fact that there is no need to form it and no auxiliary parts such as a snap ring are required. Further, as long as the ring gear main body side can be caulked, the flange material is not particularly limited, and an optimum material can be used as necessary, for example, joining of high carbon steels.

Further, in the internal ring gear according to the second aspect of the present invention, the flange is sandwiched between the step portion formed by the end faces of the inner teeth and the crimped portion to be integrally coupled in the axial direction, and the inner peripheral surface of the spigot portion is formed. Since the concave and convex shape of is embedded in a part of the flange and integrally coupled in the circumferential direction, the internal ring gear is reliably supported in the axial direction and the radial direction, and the torque is I can surely convey it.

Further, it suffices to form the spigot portion on the ring gear body leaving the tooth bottom portion, and it is not necessary to form a gear on the flange or to form a groove for a snap ring on the ring gear body. Combined with the fact that no parts are required, the internal ring gear can be manufactured at a significantly reduced cost. Further, as long as the ring gear main body side can be caulked, there is no particular restriction on the material of the flange, for example, joining of high carbon steels,
The optimum material can be used if necessary.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment according to the present invention. An internal ring gear 15 in a planetary gear device used for an automatic transmission or the like comprises a ring gear body 16 and a flange 17.

As shown in (a) and (b), the ring gear main body 16 is formed with inner teeth 16a on its inner periphery, with which a pinion supported by a carrier meshes.
A spigot portion 16b is formed by removing one end portion of 6a. The spigot portion 16b has an inner peripheral surface that is a smooth surface that guides the outer peripheral surface of the flange 17, and
A taper p is formed at the outer peripheral end portion thereof, has a depth d larger than the plate thickness t of the flange 17 by a predetermined amount, and is formed to be thinner e than other portions. The ring gear body 16 is formed by cutting the spigot portion 16b and then cutting the inner peripheral surface thereof.

On the other hand, the flange 17 has a predetermined plate thickness t as shown in (c) and (d), and the spigot portion 1
A circular outer peripheral surface 17 that can be fitted exactly to the inner peripheral surface of 6b.
a, and the outer peripheral surface 17a has a predetermined number, for example, 9
Rectangular cutouts 17b ...
Are formed. The flange 17 is formed by punching a steel plate or the like having a plate thickness t with a press, and at the same time, the notch 1
7b is formed by pressing.

Then, the flange 17 is fitted to the spigot portion 16b of the ring gear body 16, and in this state, a pressing force F in the arrow direction is applied to the tapered end surface p of the spigot portion,
The tip of the spigot portion 16b is crimped. This allows
As shown in (e) and (f), the flange 17 is sandwiched between the stepped portion b and the crimped portion f, and the ring gear main body 16 and the flange 17 are integrally coupled in the axial direction. Further, as shown in detail in (g), when caulking the spigot portion 16b, a part g of the material of the spigot portion is removed from the flange 1
When the ring gear body 16 and the flange 17 are integrally joined in the circumferential direction, the ring gear body 16 and the flange 17 flow into the cutout portion 17b of No. 7 and a part of the material is engaged with the cutout portion 17b.

The internal ring gear 15 manufactured in this manner comprises a ring gear body 16 and a flange 17, as shown in FIGS. 2 (a) and 2 (b). Further, the gear body 16 is provided with a spigot portion 16b at one end thereof adjacent to the inner teeth 16a, and the flange 17 is provided with a predetermined number, for example, four notch portions 17b on the outer periphery thereof. .
Then, with the outer periphery of the flange 17 fitted to the spigot portion 16b, by caulking the tip of the spigot portion, the flange 17 is formed between the stepped portion b and the crimped portion f by the end faces of the inner teeth 16a. While being sandwiched, a part g of the material of the spigot portion flows into the cutout portion 17b, and the gear body 16
And the flange 17 are connected.

Based on the above construction, the internal ring gear 15 has a flange 17 between the step b and the crimp f.
And the gear body 16 and the flange 17 are integrally coupled in the axial direction, and a part g of the material of the spigot portion 16b flows into the cutout portion 17b and engages with the gear body 16
And the torque acting between the flange 17 and the flange 17 is surely carried.

Next, referring to FIG. 3, the second embodiment of the present invention will be described.
An example will be described.

The internal ring gear 20 comprises a ring gear body 21 and a flange 22. As shown in (a) and (b), the ring gear body 21 has internal teeth 21 on its inner peripheral surface.
A is formed, and one end portion thereof is cut to form a spigot portion 21b. The pilot part 2
The cutting amount of 1b does not reach the root h of the internal tooth 21a, and even in the spigot portion, the uneven shape i formed by the root h portion of the internal tooth is formed. The spigot portion 21c
Is the same as in the previous embodiment except that the inner peripheral surface is formed with the concave-convex shape i, and the outer peripheral end portion is formed with a taper p, and the depth d is larger than the plate thickness t of the flange 22 by a predetermined amount. It has, and is made thinner than the other parts.

On the other hand, the flange 22 has a predetermined plate thickness t as shown in (c) and (d), and has a spigot portion 21b.
It has a circular outer peripheral surface 22a that can be fitted exactly to the inner peripheral surface of the. The flange 22 is formed by pressing as in the previous embodiment, but does not have a cutout portion on the outer peripheral surface.

Then, the flange 22 is fitted to the spigot portion 21b of the ring gear body 21, and in this state, a pressing force F in the direction of the arrow is applied to the tapered end surface p of the spigot portion,
The tip of the spigot portion 21b is crimped. This allows
As shown in (e) and (f), the flange 22 is sandwiched between the stepped portion b and the crimped portion f, and the ring gear main body 21 and the flange 22 are integrally coupled in the axial direction. Further, as shown in (g), when caulking the spigot portion 21b, the irregular shape i of the inner circumferential surface of the spigot portion bites into the corner j of the flange outer peripheral surface 22a, and a part k of the material of the corner j
The ring gear main body 21 and the flange 22 are integrally coupled in the circumferential direction by engaging with the concave portion having the uneven shape i.

Therefore, also in the present internal ring gear 20 manufactured in this manner, the flange 22 is sandwiched between the stepped portion b and the crimped portion f as in the previous embodiment, and the gear body 21 and the flange 22 are held. And are integrally coupled in the axial direction, and a part k of the material of the flange 22 flows into and engages with the concave portion of the concave-convex shape i, and carries the torque acting between the gear body 21 and the flange 22. .

A combination of the above-described first and second embodiments, that is, a notch is provided on the outer peripheral portion of the flange, and an uneven shape is provided on the inner peripheral surface of the spigot portion. It is needless to say that the material of the caulking portion may be fluidly engaged with the portion, and the uneven shape may be made to dig into a part of the flange so that the torque can be more surely carried.

[Brief description of drawings]

FIG. 1 is an upper half view showing a method for manufacturing an internal ring gear according to a first embodiment of the present invention, where (a) is a side sectional view of a ring gear body, (b) is a front view thereof, and (c) is FIG. 3 is a side sectional view of the flange, (d) is a front sectional view thereof, (e) is a side sectional view showing a coupled state, (f) is a front sectional view thereof, and (g) is an enlarged sectional view of a main part.

FIG. 2 shows an internal ring gear according to a first embodiment of the present invention, (a) is a side sectional view of an upper half portion thereof, and (b) is an enlarged sectional view of an essential part thereof.

FIG. 3 is an upper half view showing a method of manufacturing an internal ring gear according to a second embodiment of the present invention, (a) is a side sectional view of a ring gear body, (b) is a front view thereof, and (c) is a sectional view thereof. FIG. 3 is a side sectional view of the flange, (d) is a front sectional view thereof, (e) is a side sectional view showing a coupled state, (f) is a front sectional view thereof, and (g) is an enlarged sectional view of a main part.

FIG. 4 is a sectional view showing an automatic transmission to which the present invention can be applied.

FIG. 5 shows an internal ring gear according to a conventional example,
(a) is a cross-sectional view of the upper half portion thereof, and (b) is an enlarged view of the B portion.

FIG. 6 is a sectional view showing an upper half portion of an internal ring gear according to another conventional example.

[Explanation of symbols]

 15,20 Internal ring gear 16,21 Ring gear main body 17,22 Flange 16a, 21a Inner tooth 16b, 21b Inlay portion 17a, 22a Outer peripheral surface 17b Notch portion b Step portion d Depth f Caulking portion g Part of material h tooth Bottom i Concavo-convex shape j Part of flange (corner) k Biting part t Plate thickness

Claims (4)

[Claims] 1. An internal ring gear comprising a ring gear main body and a flange coupled to the ring gear main body, wherein the ring gear main body has a spigot portion adjacent to internal teeth at one end thereof, and the flange has an outer peripheral surface thereof. A predetermined number of notches are formed, and by caulking the tip of the spigot with the flange fitted to the spigot, the gap between the step formed by the end faces of the internal teeth and the crimp The internal ring gear, wherein the flange is clamped by and a part of the material of the spigot part flows into and engages with the cutout part. 2. A method for manufacturing an internal ring gear, comprising connecting a flange to a ring gear body, wherein a spigot portion is formed at one end of the ring gear body adjacent to an inner tooth, and a spigot surface of the flange is formed. A predetermined portion is cut out to form a cutout portion, and the flange is fitted to the spigot portion, and in this state, the tip of the spigot portion is swaged to form a stepped portion and a swaged portion formed of the end faces of the internal teeth. The said flange is pinched | interposed between and, while flowing a part of material of the said spigot part to the said notch part, the said ring gear main body and a flange are couple | bonded, The interface of Claim 1 characterized by the above-mentioned. Method for manufacturing null ring gear. 3. An internal ring gear comprising a ring gear body and a flange coupled to the ring gear body, wherein the ring gear body is provided at one end thereof with a spigot portion adjacent to the internal teeth and having an irregular shape on the inner peripheral surface thereof. And, by crimping the tip end portion of the spigot portion in a state where the flange is fitted to the spigot portion, the flange is sandwiched between the crimp portion and the step portion formed of the end faces of the internal teeth, and An internal ring gear in which the uneven shape is partly embedded in the flange. 4. A method for manufacturing an internal ring gear, wherein a flange is joined to a ring gear body, wherein an inlay portion having an uneven shape consisting of a tooth bottom portion adjacent to an internal tooth is provided at one end of the ring gear body. Then, the flange is fitted to the spigot portion, and in this state, the tip of the spigot portion is crimped, so that the flange is sandwiched between the step portion formed by the end faces of the internal teeth and the crimped portion. The method for manufacturing an internal ring gear according to claim 3, wherein the uneven shape is also embedded in a part of the flange to join the ring gear body and the flange together.