JP2583820B2 - Missing internal gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal gear in an apparatus such as an automatic transmission, which is housed in an oil-filled casing and allows oil in the casing to flow into and out of the internal gear. It is about.

[0002]

2. Description of the Related Art In devices such as automatic transmissions of automobiles,
There is used an internal gear that stirs lubricating oil or oil for hydraulic control filled in a casing so that the oil can freely flow between the inside and the outside of the internal gear. As shown in FIG. 4, the internal gear having such an action is formed by forging a comb-shaped annular portion 2A so as to be cut out at regular intervals in the circumferential direction.
A required internal tooth is formed by machining on the inner peripheral surface of the comb-shaped annular portion 2A except A, and lubricating oil or hydraulic control oil flows inside and outside the internal gear 1A through the notch 4A. As shown in FIG. 5, or as shown in FIG. 5, a plurality of small holes 4B are formed by drilling or punching in the valleys of the internal teeth H formed at predetermined intervals on the inner peripheral surface of the annular portion 2B. The lubricating oil or the oil for hydraulic control is used to flow inside and outside the internal gear 1B through the hole 4B.

[0003]

Among them, in the case of the internal gear 1A in which the comb-shaped annular portion 2A is cut out at regular intervals in the circumferential direction and formed by forging, the lubricating oil in the casing or A predetermined amount of hydraulic control oil can flow in and out of the internal gear 1A, but the thickness of the annular portion 2A must be increased in order to obtain a predetermined strength. Therefore, there was a limit to weight reduction. On the other hand, the latter annular portion 2B
In the internal gear 1B in which a number of small holes 4B are formed by drilling or punching in the valleys of the internal teeth H formed at predetermined intervals on the inner peripheral surface of the internal gear H, the lubricating oil in the casing or the oil for hydraulic control is used. Internal gear 1
In order to make the flow amount of B into and out of a predetermined amount, a large number of perforations are required, so that the strength of the annular portion 2B is reduced, and labor is required for the perforation work.

An object of the present invention is to secure the amount of lubricating oil or oil for hydraulic control in a predetermined casing inside and outside the internal gear and to reduce the weight without deteriorating the strength of the internal gear. It is an object of the present invention to provide a partially toothed internal gear that is capable of performing the following.

[0005]

In order to achieve the above object, an internal gear according to the present invention is an internal gear in which internal teeth are formed on the inner peripheral surface of an annular portion. It is characterized in that a toothless portion having no teeth is formed, and an oil hole for oil distribution is formed in the toothless portion.

[0006]

[Action] At a certain interval, a missing tooth portion is formed in which only one tooth has been eliminated, and an oil hole for oil distribution is formed in the missing tooth portion. Can be increased,
It is possible to secure the amount of lubricating oil or hydraulic control oil flowing in and out of the internal gear in a predetermined casing, and to reduce the weight without reducing the strength even if the internal gear is thinned. Can be.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a toothless internal gear of the present invention. In the drawings, reference numeral 1 denotes an embodiment of a missing toothed internal gear of the present invention. The missing toothed internal gear 1 has an annular portion 2 having a required diameter and thickness, and a required portion on one end side surface of the annular portion 2. The inner flange 3 is formed with a hole having a diameter. The toothless internal gear 1 is formed by cold plastic working. Internal gear 1
The plate thickness of the plate-shaped molding material W used for molding is, for example, 3
１５15 mm, the outer diameter of the formed internal gear is, for example, 8
The thickness is appropriately set within the range of 0 to 200 mm, but the thickness of the forming material W and the outer diameter of the internal gear are not necessarily limited to the above ranges.

Next, a process of forming the internal gear by cold plastic working using a plate-shaped material will be described. A plate-shaped material having a predetermined plate thickness is manufactured into a disk shape having a diameter calculated from the mass of the internal gear previously calculated according to the plate thickness of the material.

Next, the molding material W is divided into a lower mold 10 and an upper mold 2.
Hold it between 0. This lower mold 10 is a molding die,
It has the diameter of the internal gear to be formed and has a tooth profile H0 on the outer peripheral surface of the mold. As shown in detail in FIG. 1, the tooth profile H0 has a diameter and teeth of the external gear so that the internal teeth T smoothly mesh with the external gear (not shown) that meshes with the internal gear 1. An internal tooth portion T having a number of teeth corresponding to the number of teeth and a toothless portion O in which one internal tooth is eliminated at regular intervals are formed on the inner peripheral surface of the annular portion 2 of the internal gear 1.

The upper die 20 pinches and supports the center position of the top plane of the lower die 10, that is, substantially the center of the molding material W placed on the rotating shafts of the upper and lower dies 10, 20.
It is formed smaller in diameter than the lower mold 10. The upper and lower dies 10, 2
The pressure for clamping the molding material W between the upper and lower dies 10, 20
Is rotated to perform cold plastic working on the forming material W with a forming roller 30 described later, and is set to a value that can firmly support the forming material W, and is usually about 80 to 100 KN.

Further, at the outer peripheral position of the lower mold 10, two or more forming rollers 30, 30,... The forming rollers 30, 30,...
They are the same size, are arranged in the radial direction of the lower mold 10 and are all equidistant from the center of rotation of the lower mold 10, and are rotatably supported.

.. Are pressed against the outer peripheral surface of the lower mold 10 at the same pressure, but in a direction perpendicular to the rotation of the lower mold 10 and about 30K.
Pressing is performed at a pressure of N. And upper and lower mold 1
The molding material W clamped between the upper and lower dies 10, 2
0 for the required number of revolutions, for example 500-1000 per minute
.. While rotating by rotating the lower rollers 10 in the axial direction of the lower die 10 at a feed rate of about 0.2 m / min from the outer peripheral positions of the upper ends of the lower die 10. Move to At this time, the pressing force of the forming rollers 30, 30,... Is kept constant, and is controlled by CNC control to adjust the outer peripheral shape of the internal gear, and the forming rollers 30, 30,. .. Follow the rotation, the peripheral speed of the outer peripheral surface of the forming material W formed on the outer peripheral surface of the lower mold 10 is equal to that of the forming rollers 30, 30..., And the peripheral speed is 300 to 550 m / min. Is appropriate.

Further, in the present invention, since the object is to increase the strength by cold plastic working, it is possible to prevent heat generation at the time of press forming and to form the material W between the forming rollers 30, 30,. For lubrication, a coolant is blown at a predetermined pressure during molding.

In this way, the molding material W is formed by cold plastic working and the internal gear 1 is formed by cold plastic working while increasing the strength. The clamping force, the rotation speed, and the forming rollers 30, 30,...
The pressing force and the moving speed are appropriately selected depending on the material of the forming material W, the outer diameter and the shape of the internal gear 1 to be formed, and the like.

FIG. 3 shows a processing state at the time of forming processing according to the present invention. In the figure, T0 indicates the thickness of the material, T1 indicates the tooth height, and T2 indicates the thickness of the annular portion 2. During molding, the molding material W is the lower mold 10
And the pressure roller 30, and the material is continuously subjected to cold plastic working. At this time, the material flows along the lower mold 10, and one tooth is formed on the inner peripheral surface of the annular portion 2 at regular intervals. The internal teeth H having the missing tooth portions without the internal teeth are formed. By setting the thickness T0 of the material to T0 = (T1 + T2) / (0.5 to 0.8), deformation during molding occurs over the entire range, and a uniform high-strength internal gear is formed. Can be manufactured. In addition, since excess material generated during molding is extruded in the feed direction of the pressure roller 30, defects such as scratches are less likely to occur in combination with continuous processing.

As described above, cold plastic working is performed by a combination of the rotation of the forming material W sandwiched between the upper and lower dies 10, 20 and the pressing movement of the forming rollers 30, 30,. It is continuously formed into a cup. Thereby, according to the outer peripheral surface shape of the lower die 10, the internal teeth H having the toothless portions where the internal teeth of one tooth are eliminated at regular intervals on the internal peripheral surface of the annular portion 2.
Are molded simultaneously.

After the internal gear 1 is formed by cold plastic working in this way, the internal gear H adjacent to the missing tooth portion O is drilled or the like so as not to damage the internal gear H so that the oil hole having the maximum diameter is formed. 4. Drill 4 At this time, the number of oil holes 4 drilled in one missing tooth portion O can be one or two or more, and a predetermined amount of oil flows through the oil hole 4 in the entire internal gear 1. To do.

[0018]

According to the missing tooth internal gear of the present invention, the diameter of the oil hole can be increased while smoothly maintaining the meshing state with the external gear meshed with the internal gear, and the predetermined gear can be formed. The amount of lubricating oil or oil for hydraulic control in the housing to and from the inside and outside of the internal gear can be secured, and even if the internal gear is made thinner, its strength is not impaired and the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view in which a part of a toothless internal gear of the present invention is partially broken.

FIG. 2 is an explanatory view showing a forming process of a missing tooth internal gear according to the present invention.

FIG. 3 is an explanatory view showing plastic working of a material in a forming step.

FIG. 4 is an external perspective view in which a part of a conventional internal gear is cut away.

FIG. 5 is an external perspective view in which a part of a conventional internal gear is cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Missing internal gear 2 Annular part 3 Inner flange 4 Oil hole T Internal tooth part O Missing tooth part 10 Molding die 20 Upper die 30 Molding roller W Molding material H Internal gear

Claims (1)

(57) [Claims] In an internal gear having internal teeth formed on an inner peripheral surface of an annular portion, a toothless portion is formed in which the internal teeth of one tooth are eliminated at regular intervals, and an oil circulates through the toothless portion. Missing tooth internal gear having an oil hole for use.