JP3342343B2 - Gear with oil hole and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear having an oil hole having a tooth profile on the inner and outer circumferences and having an oil hole communicating the inner and outer circumferences, and a method of manufacturing the same.

[0002]

2. Description of the Related Art For example, in an automatic transmission of an automobile, etc.
In order to supply lubricating oil or oil for hydraulic control, the gear is provided with an oil hole communicating with the inner and outer circumferences. A method of manufacturing the gear provided with the oil hole will be described with reference to FIG. 11. First, a columnar material 101 ((A) in FIG. 11) is subjected to forging, and is erected from the bottom 112 and the bottom 112. A cup-shaped preform 111 having a peripheral wall portion 113 (see FIG. 11)
(A)) is formed. Next, the peripheral wall portion 113 of the preform 111 is swaged up, and a predetermined tooth profile 122, 1 is formed on the inner and outer circumferences.
An intermediate molded product 121 ((c) in FIG. 11) obtained by molding 25 is formed. Then, finally, an oil hole 132 is formed in the outer peripheral valley portion 124 formed between the outer peripheral ridge portion 123 of the outer peripheral tooth shape 122 of the intermediate molded product 121 by a drill or the like. The gear 131 was manufactured as shown in FIG. By forming the oil hole 132 in the outer peripheral valley portion 124 in this way, a plurality of oil holes 132 can be easily formed.

However, in order to increase the amount of oil to be supplied, oil holes 1
Increasing the number of 32 may take time to drill. Therefore, it is conceivable to increase the diameter without increasing the number of oil holes 132, but when the diameter is increased,
The oil hole 132 does not fit within the width of the outer peripheral valley 124 and protrudes toward the outer peripheral ridge 123. Thus, the oil hole 132
If the hole protrudes toward the outer peripheral ridge 123 side, the drilling means contacts the outer peripheral ridge 123 when the oil hole 132 is formed, and the life of the drilling means may be shortened.

In order to prevent the drilling means from coming into contact with the teeth, it is necessary to provide a plurality of missing tooth portions in which the outer peripheral ridge for one tooth has been eliminated, and to drill an oil hole in the missing tooth portion. is there. As such a gear for forming an oil hole in a toothless portion, there is Japanese Patent Application No. 63-286069 filed by the present applicant.

[0005]

In a gear having an oil hole formed in the missing tooth portion, the diameter of the oil hole can be increased, and the amount of oil to be supplied can be increased. However, since the place where the oil hole is drilled is limited to the missing tooth part, it takes time to position,
Productivity may decrease.

Accordingly, the present invention solves the above-mentioned problems, and provides a gear with an oil hole, which has high productivity, can cope with a gear with a large amount of supplied oil, and has a long service life of a drilling means, and a method of manufacturing the same. The purpose is to supply.

[0007]

The present invention is as follows.

[0010] A gear with an oil hole according to the present invention has an outer tooth profile including an outer peripheral ridge protruding on the outer periphery and an outer peripheral valley recessed on the outer periphery, and an inner valley and an outer valley facing the outer peripheral ridge on the inner periphery. An inner peripheral toothed portion comprising an inner peripheral ridge facing the portion, the outer surface of the axially partially deformed portion of the outer peripheral ridge is located inside the inner surface of the inner peripheral valley, and the outer surface of the deformed portion and the inner surface of the inner peripheral valley. An oil hole communicating between the inner and outer peripheries is formed between the inner and outer peripheries.

(2) Another gear with an oil hole according to the present invention is an outer gear having an outer ridge formed on the outer periphery and an outer valley formed on the inner periphery, and an inner valley opposed to the outer ridge on the inner periphery. And having an inner peripheral tooth shape composed of an inner peripheral mountain portion facing the outer peripheral valley portion, and an inner surface of the axially partially deformed portion of the inner peripheral mountain portion is located inside the outer surface of the outer peripheral valley portion, and an inner surface of the deformed portion. An oil hole communicating the inner and outer peripheries is formed between the outer perimeter of the outer trough and the outer surface.

[0010] Next, the method for manufacturing a gear with an oil hole according to the present invention is directed to an outer peripheral tooth profile including an outer peripheral ridge protruding on the outer periphery and an outer peripheral valley recessed, and facing the outer peripheral ridge on the inner periphery. Forming process of forming a spare gear having an inner peripheral tooth shape composed of an inner peripheral valley portion and an inner peripheral valley portion facing the outer peripheral valley portion, and an axially partially deformed portion of the outer peripheral valley portion, the outer surface of which is an inner surface of the inner peripheral valley portion. And a press forming step of pressing and moving inward so as to be located further inside.

[0011] Further, another method of manufacturing a gear with an oil hole according to the present invention is characterized in that an outer peripheral tooth profile including an outer peripheral ridge portion protruding on the outer periphery and an outer peripheral valley portion recessed is provided. A tooth forming step of forming a spare gear having an inner peripheral tooth shape composed of an opposed inner peripheral valley and an inner peripheral ridge facing the outer peripheral valley, and an axially partially deformed portion of the inner peripheral valley, And a press forming step of pressing and moving outward so as to be located outside the outer surface of the sheet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1D and 4 show a gear 31 with an oil hole according to an embodiment of the present invention. FIG.
Is an enlarged view of a main part. The gear 31 with an oil hole includes a bottom portion 12 having a predetermined diameter, and a peripheral wall portion 13 erected continuously from the bottom portion 12. An outer peripheral valley portion 24 and an inner peripheral valley portion 2 opposed to an outer peripheral ridge portion 23 on the inner periphery.
An inner peripheral tooth shape 25 including an inner peripheral mountain portion 26 facing the outer peripheral valley portion 24 is provided. Further, a concave space 33 is formed in the outer peripheral mountain portion 23 so that a part thereof in the axial direction is depressed toward the center of the peripheral wall portion 13.
Is provided on the center side of. This deformed part 34
Has an outer surface s located inside the inner surface t of the inner peripheral valley portion 27, and an oil hole 32 communicating between the inner and outer peripheries is formed between the outer surface s of the deformed portion 34 and the inner surface t of the inner peripheral valley portion 27.

A method of manufacturing such a gear 31 with an oil hole will be sequentially described with reference to FIG.

First, a columnar material 1 as shown in FIG. 1A is forged, and a bottom 1 as shown in FIG.
The cup-shaped preform 11 having the peripheral wall portion 13 and the cup 2 is formed. Next, the peripheral wall portion 13 of the preform 11 is set up, and as shown in FIG. 1 (c), an outer peripheral tooth shape 2 composed of an outer peripheral ridge portion 23 protruding on the outer periphery and an outer peripheral valley portion 24 recessed.
2. An inner peripheral tooth shape 2 including an inner peripheral valley 27 facing the outer peripheral valley 23 and an inner peripheral valley 26 facing the outer peripheral valley 24 on the inner periphery.
5 is formed. Then, finally, the axially partially deformed portion 34 of the outer peripheral mountain portion 23 of the spare gear 21 is pressed and moved inward, and as shown in FIGS.
Gear 31 with an oil hole formed with an oil hole 32 communicating the inner and outer circumferences
To form

In the above manufacturing process, a press forming process for forming the gear 31 with an oil hole from the spare gear 21 will be described with reference to FIGS.

First, the press forming apparatus 51 will be described with reference to FIG. The left half of the drawing shows the state before the auxiliary gear 21 is mounted on the pressing device 51, and the right half shows the state after the mounting. Reference numeral 71 denotes a lower die on which the spare gear 21 is disposed, and an upper die 61 capable of moving up and down is disposed above and opposite to the lower die 71.

The lower mold 71 has a spare gear 21 at its center.
, A movable holder 72 having a forming punch 75 protruding toward the center, and an annular support block 76 disposed below the movable holder 72 on the outer peripheral side of the mandrel 78. In addition, an annular base 77 which is further disposed below the support block 76 and positions the mandrel 78 is provided. Here, the mandrel 78 is provided with a holding projection 80 extending in the axial direction and engaging with the inner peripheral valley portion 27 of the spare gear 21 as shown in FIG. As shown in FIG. 7, a part of the holding protrusion 80 in the axial direction is an unformed cutout 79.
Is provided. As shown in FIG. 2, the movable holder 72 is disposed at a position facing the holding projection 80 so as to be able to advance and retreat toward the mandrel 78.
A sliding surface 74 having a gradually decreasing diameter toward 1 is provided. Forming punch 75 fixed to this moving holder 72
Are provided at positions facing the notch 79 of the mandrel 78, and as shown in FIG.
b and 75b protrude toward the mandrel 78 from the distal end pressing portion 75a therebetween.

The upper die 61 comprises a punch 63 facing the mandrel 78, a pressure ring 64 facing the moving holder 72, and a fixed plate 62 for integrally fixing the punch 63 and the pressure ring 64. A tapered surface 65 that engages with the sliding surface 74 of the movable holder 72 is provided on the inner peripheral portion of the lower die 71 on the pressing ring 64.

The process of forming the gear 31 with oil holes from the spare gear 21 in the press forming apparatus 51 will be described. First, FIG.
As shown in the left half of FIG.
2 is made to stand by on the outer peripheral side, and the spare gear 21 is transported above the mandrel 78 with the bottom 12 thereof positioned above, and then the spare gear 21 is mounted on the mandrel 78 as shown in the right half of FIG. . At this time, as shown in FIG.
Accordingly, a molding space 90 exists between the preliminary gear 21 and the mandrel 78. On the other hand, as shown in FIG.
Engages with the inner peripheral valley portion 27 of the spare gear 21.

Subsequently, as shown in FIG. 3, the upper die 61 is lowered, and the tapered surface 65 of the pressure ring 64 is moved to the movable holder 72.
At the same time, the movable holder 72 moves toward the mandrel 78 by the taper action. The forming punch 75 finally fixed to the moving holder 72 presses the partially deformed portion 34 in the axial direction of the outer peripheral mountain portion 23 of the preliminary gear 21 toward the mandrel 78, and as shown in FIG. The deformed portion 3 is formed by the tip pressing portion 75a of the forming punch 75 so that s is located inside the inner surface t of the inner peripheral valley portion 27.
Move 4. During this movement, the deformed portion 34 is pressed and swells in the circumferential direction, but is restricted by the guides 75b, 75b formed at both ends in the width direction of the forming punch 75, so that swelling in the circumferential direction is suppressed. Is done. As shown in FIG. 6, both sides of the deformed portion 34 in the axial direction
Of the mandrel 78 that engages the inner peripheral valley 27
Since the tooth shape is maintained by 0, the tooth shape is not deformed following the deformed portion 34 that moves by pressing. As a result, as shown in FIG. 4, the outer surface s of the deformed portion 34 and the inner peripheral valley 2
Two oil holes 32 are formed between the inner surface t and the inner surface t so as to communicate the inner and outer circumferences, and the formation of the gear 31 with oil holes is completed.

Therefore, the gear 31 with an oil hole as described above has a large oil hole 32 along the inner peripheral valley portion 27.

According to the above-described method of manufacturing the gear 31 with an oil hole, the oil hole 32 can be formed by pressing the deformed portion 34. Further, the oil hole 32 can be formed without using a low-durability drill unlike the conventional oil hole 132.

In the gear 31 with the oil hole of the above embodiment,
The outer surface s of the partially deformed portion 34 in the axial direction of the outer peripheral mountain portion 23 is located inside the inner surface t of the inner peripheral valley portion 27, and the inner and outer circumferences communicate between the outer surface s of the deformed portion 34 and the inner surface t of the inner peripheral valley portion 27. In contrast, as shown in FIG. 10, the inner surface y of the partially deformed portion 34 in the axial direction of the inner peripheral mountain portion 26 is located inside the outer surface x of the outer peripheral valley portion 24 and the deformed portion is formed as shown in FIG. An oil hole 32 communicating the inner and outer circumferences may be formed between the inner surface y of the outer circumferential surface 34 and the outer surface x of the outer circumferential valley portion 24.

In this case, the method of manufacturing the gear with oil holes is shown in FIG.
As shown in the figure, the axially partially deformed portion 3 of the inner peripheral mountain portion 26 is formed by the forming punch 75 installed on the inner peripheral side of the preliminary gear 21.
4 can be moved outward so that its inner surface y is located outside the outer surface x of the outer peripheral valley portion 24.

[0026]

As described above, according to the gear with an oil hole of the present invention, since the oil hole has a large oil hole along the inner peripheral valley, the amount of oil to be supplied can be increased. Further, according to the method of manufacturing a gear with an oil hole of the present invention, the oil hole can be formed by press-forming the deformed portion, so that the productivity can be improved.
Further, since the oil hole can be formed without using a drill having low durability as in the conventional oil hole forming, the life of the drilling means is prolonged.

[Brief description of the drawings]

FIG. 1 is a sectional plan view illustrating a method for manufacturing a gear with oil holes according to an embodiment of the present invention.

FIG. 2 illustrates a process of manufacturing a gear with an oil hole from a spare gear according to an embodiment of the present invention. The left half shows a state before the spare gear is mounted, and the right half shows a state after the spare gear is mounted.

FIG. 3 shows a state after forming an oil hole in a process of manufacturing a gear with an oil hole from a spare gear according to an embodiment of the present invention.

FIG. 4 is a perspective view of a main part of a gear with an oil hole according to an embodiment of the present invention.

FIG. 5 is a sectional plan view taken along line BB of FIG. 2;

FIG. 6 is a sectional plan view taken along line DD of FIG. 3;

FIG. 7 is a sectional plan view taken along the line AA of FIG. 2;

FIG. 8 is a cross-sectional plan view taken along the line CC of FIG. 3;

FIG. 9 is a cross-sectional plan view illustrating a step of manufacturing a gear with an oil hole according to another embodiment of the present invention.

FIG. 10 is a perspective view of a main part of a gear with an oil hole according to another embodiment of the present invention.

FIG. 11 is a cross-sectional plan view illustrating a conventional method of manufacturing a gear with an oil hole.

[Explanation of symbols]

 Reference Signs List 21 spare gear 22 outer peripheral tooth form 23 outer peripheral peak part 24 outer peripheral valley part 25 inner peripheral tooth form 26 inner peripheral peak part 27 inner peripheral valley part 32 oil hole 34 deformed part s (deformed part) outer surface t (inner peripheral valley part) inner surface x (outer peripheral valley part) Outside surface y) inside surface (of deformed part)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 57/02-57/04 B21D 28/32 B21K 1/30 B23P 15/14

Claims (4)

(57) [Claims] An outer peripheral tooth profile (2) comprising an outer peripheral ridge (23) protruding on the outer periphery and an outer peripheral valley (24) recessed.
2) having an inner peripheral tooth form (25) on the inner periphery comprising an inner peripheral valley (27) facing the outer peripheral valley (23) and an inner peripheral valley (26) facing the outer peripheral valley (24); The outer surface (s) of the partially deformed portion (34) in the axial direction of the outer peripheral mountain portion (23) is located inside the inner surface (t) of the inner peripheral valley portion (27), and the outer surface ( A gear with an oil hole in which an oil hole (32) communicating between the inner and outer peripheries is formed between s) and the inner surface (t) of the inner peripheral valley (27). 2. An outer peripheral tooth profile (22) comprising an outer peripheral ridge (23) protruding on the outer periphery and an outer peripheral valley (24) recessed.
An inner peripheral valley (2) opposed to the outer peripheral ridge (23)
7) and the inner peripheral ridge (2) facing the outer peripheral valley (24).
6), and the inner surface (y) of the partially deformed portion (34) in the axial direction of the inner peripheral ridge (26) is larger than the outer surface (x) of the outer peripheral valley (24). And the inner surface (y) of the deformed portion (34) and the outer valley (2).
Oil hole (3) communicating the inner and outer circumferences with the outer surface (x) of (4).
2) A gear with an oil hole formed. 3. An outer tooth profile (2) comprising an outer peripheral ridge (23) protruding on the outer periphery and an outer peripheral valley (24) recessed.
2) A spare having an inner peripheral tooth shape (25) on the inner periphery comprising an inner peripheral valley (27) facing the outer peripheral valley (23) and an inner peripheral ridge (26) facing the outer peripheral valley (24). A tooth forming step of forming a gear (21);
The partially deformed portion (34) in the axial direction of (3) is attached to its outer surface (s).
And a pressing step of pressing and moving inward so as to be located inside the inner surface (t) of the inner peripheral valley portion (27). 4. An outer peripheral tooth form (2) comprising an outer peripheral ridge (23) protruding on the outer periphery and an outer peripheral valley (24) recessed.
2) A spare having an inner peripheral tooth shape (25) on the inner periphery comprising an inner peripheral valley (27) facing the outer peripheral valley (23) and an inner peripheral ridge (26) facing the outer peripheral valley (24). A tooth forming step of forming a gear (21);
The partially deformed portion (34) in the axial direction of (6) is connected to its inner surface (y).
A press forming step of pressing and moving the outer side so as to be located outside the outer surface (x) of the outer peripheral valley portion (24).