JP2000046070A - Manufacture of synchronizer cone of speed change clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a synchronizer cone of a clutch for transmission, in which the manufacturing processes are simplified and costs are suppressed. SOLUTION: A cylindrical blank 32 to undergo a shaping process is configured so that a ring-shaped projection 30 having a thickness corresponding to the height of the tooth part of a synchronizer cone and a taper surface 28 having a smaller thickness than the projection are formed in a single piece on the same axis, and the periphery of the projection 30 is cut at constant intervals in the axial direction so that a plurality of projections are formed. These projections are located between a lower die 44 to form a cavity mating with a crest shape of the tip of the tooth part and a ring member 46 to form a cavity corresponding to the shape of the taper on the tooth part, and using an upper die, the projections are intruded to between the lower die 44 and ring member 46 to undergo a shaping process. The ring member 46 is opened in the horizontal direction along the oversurface of the lower die 44 approx. perpendicular to the counter tapered surface to the taper of the tooth part, and the upper die is opened, and the completed synchronizer cone is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a synchronizer cone for a transmission clutch of an automobile.

[0002]

2. Description of the Related Art In general, a manual transmission of an automobile employs a synchronizing mechanism in order to smoothly shift gears.

As shown in FIG. 9 and FIG. 10, such a synchronizing mechanism is such that when a shift lever (not shown) is moved to move the annular sleeve 1 in the direction of the arrow to exchange the driven gears 2a and 2b, a synchronizer is used. The ring 3 is pressed against a synchronizer cone (clutch cone) 4 integrally formed with the driven gear 2a, and a frictional force is generated on the conical surface to synchronize a rotational speed difference between the sleeve 1 and the driven gear 2a. ) Many mechanisms are adopted. in this case,
As the rotational speed difference between the sleeve 1, the synchronizer ring 3 and the synchronizer cone 4 decreases,
Synchronizer ring 3 and synchronizer cone 4
The positions of the key grooves 6 and 7 gradually align, and the key 5 provided on the inner periphery of the sleeve 1 enters the key grooves 6 and 7.
Next, as shown in FIG. 11, when the movement of the synchronizer cone 4 is completed until the sleeve 1 is fully driven gear 2a, the shift is completed.

As described above, the synchronizer cone 4 of the transmission clutch has a tooth portion (key) 8 with which an outer taper portion 4a that comes into contact with the inner taper portion 3a of the synchronizer ring 3 engages a key (not shown) of the sleeve 1. And a keyway 7. The tooth portion 8 has an angled tooth tip 8a toward the synchronizer ring 3, and the tooth portion 8a is formed.
From the middle, a reverse tapered portion 8b having a smaller width and a smaller height toward the driven gear 2a side is formed. Thus, the gear is prevented from coming off.

The synchronizer cone 4 has an inner peripheral surface fixed to the outer peripheral surface of the annular projection of the driven gear 2a by brazing or the like. Such a synchronizing mechanism using the synchronizer cone 4 is called an inertia lock type among the synchromesh.

The synchronizer cone 4 is usually formed by a forging method, but cannot be formed at one time because it has a special shape having the inverted tapered portion 8b as described above. In general, (1) the tapered portion 4
a and rough forming of the tooth portion 8, (2) forming of the tooth portion 8, (3)
It is necessary to go through three steps of forming the reverse tapered portion 8b of the tooth portion 8. For this reason, it is required to reduce the number of steps for molding the synchronizer cone 4 to reduce the manufacturing cost.

[0007] In this regard, the invention "Method for forging a forged product having a reverse tapered portion" has been proposed (Japanese Patent Laid-Open No. 1-118).
331). In this method, first, using a rough land forging die, a portion corresponding to a tooth portion has a non-inverted tapered projection with respect to the die-cutting direction, and partially protrudes from the projection in the die-cutting direction. Obtain a wasteland forged product formed as a surplus part integral with the part. Next, using a finish forging die having a cavity mold surface having an inverse taper shape with respect to the die-cutting direction, and a punch die pressed toward the finish forging die, the protrusion of the rough terrain forging is replaced with the punch die. And cold forging. Thus, the excess portion is formed by flowing and deforming in the direction of the reverse tapered cavity mold surface intersecting with the pressing direction of the punch die, and forming the reverse tapered reverse tapered portion in the die removing direction of the finish forging die. A finish forged product is obtained by forming on the projection. In this case, the cavity portion corresponding to the side wall integrated with the tip of the tooth portion to be molded has one of the above-described inversely tapered cavity-shaped surface and the other being the tapered cavity-shaped surface. Therefore, when the finished forged product is extruded in the direction opposite to the tooth tip along the axis at the time of die removal, it is extruded along the tapered cavity mold surface while slightly turning around the axis. It is said that it can be pulled out.

In order to obtain a forged product having an inverted tapered portion from a viewpoint different from the above-mentioned method, the invention "Method for forming gear teeth of a clutch for transmission" has been proposed (Japanese Patent Laid-Open No. 2-15).
No. 1339). In this method, first, in a first forging step, the teeth are formed halfway with a thickness equal to the required length of the teeth to form half-spline teeth and an intermediate material having a surplus part left. I do. Next, in a second forging process, a first mold having a blade portion for receiving the tip of the tooth portion (half spline tooth) formed halfway, a flat portion abutting on the tooth space and a reverse taper The excess thickness is removed and reverse taper molding is performed by pressing against a second mold having a molding side surface. This makes it possible to eliminate the problem of direct contact between the die and the punch when trying to form a penetrated tooth during rocking forging, and to reduce the cutting allowance for cutting off the excess portion in a later step. It is said that it can be.

[0009]

In the former method, in which an inverted tapered portion is formed on one side wall of the tooth portion and a tapered portion is formed on the other side wall, responsiveness at the time of performing a rapid shift operation is low. Insufficient and there are problems such as generation of noise.

On the other hand, in the case where the reverse taper is formed on both side walls of the tooth portion by the latter method, the forging process includes a process of forming an intermediate material, a process of removing excess material, and a process of forming a reverse taper.
There is a problem that a process is required.

The present invention has been made in view of such a problem, and a tooth portion having a tapered portion and an inverted tapered portion can be formed at a time by a single forging process.
It is an object of the present invention to provide a method of manufacturing a synchronizer cone of a speed change clutch which can simplify a manufacturing process and reduce a manufacturing cost.

[0012]

According to the present invention, there is provided a method of manufacturing a synchronizer cone for a transmission clutch, comprising: a plurality of teeth formed on a driven gear and having an inversely tapered surface gradually narrowing toward the driven gear; A method of manufacturing a synchronizer cone for a transmission clutch having
Prepare a ring-shaped molding material in which the main body and the tapered part are integrally formed coaxially, and then cut out the outer periphery of the main body at equal intervals along the axial direction to form a plurality of protrusions. Forming an intermediate molded product by forming the approximate shape of the tooth portion, and then forming a projection of the intermediate molded product on the lower die having a plurality of cavity portions corresponding to the shape of the tip of the tooth portion; A reverse taper portion is formed toward the mold opening direction of the upper die corresponding to the shape of the reverse taper surface of the tooth portion, and is positioned between the lower die and a ring member provided by dividing the lower die into a plurality of parts. The protrusion is pressed into the lower die and the ring member by an upper die having a shape corresponding to the shape of the tail end side of the tooth portion to obtain a completed molded product. By opening the mold along the upper surface of the lower mold and opening the upper mold, Retrieve the synchronizer cone as made molded articles, characterized in that.

Thus, the synchronizer cone in which the teeth having the tapered portion and the reverse tapered portion are formed can be formed in one forging process, so that the manufacturing process is simplified and the manufacturing cost is reduced. A synchronizer cone for the clutch can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for manufacturing a synchronizer cone for a transmission clutch according to the present invention will be described below with reference to FIGS.

A completed synchronizer cone 10 shown in FIG. 1 has a predetermined outer circumferential surface with a tooth groove 14 interposed therebetween so as to extend in the axial direction (arrow direction) of a narrow cylindrical member (main body) 12. A plurality of tooth portions 16 spaced apart are formed in a circle. The tooth portion 16 has a mountain-shaped tooth tip portion 18 formed at one end, and inclined surfaces 20, 22, 24 which become narrower toward the other end. That is, the inclined surfaces 20, 22, and 24 are formed with a taper that becomes gradually lower than the other end of the tooth portion 16. on the other hand,
An annular tapered portion 26 is provided integrally with the cylindrical member 12 along the axial direction of the cylindrical member 12. The tapered portion 26 has a tapered surface 28 whose thickness gradually decreases as the distance from the main body of the cylindrical member 12 increases, as easily understood from FIG. The synchronizer cone 10 having such a shape is manufactured by the following method.

First, as shown in FIG. 2, an annular projection 30 having a thickness corresponding to the length of the teeth 16 of the synchronizer cone 10 and a tapered portion having a tapered surface 28 are formed by an appropriate method such as cutting. A molding material 32 integrally formed coaxially with the molding material 26 is prepared.

Next, as shown in FIG. 3, the outer periphery of the annular projection 30 is cut at equal intervals along the axial direction to form a plurality of projections 34, and the plurality of projections 34 are formed by electric discharge machining or the like. A required shape such as a mountain-shaped tooth tip 18 is formed for the projection 34. This is an intermediate molded product. In the present embodiment, the tapered surfaces 36a and 36b are formed along the height direction of the portion of the projection 34 corresponding to the tooth tip 18, and the tapered surface 38a is also formed on the side wall of the projection 34. ,
38b are formed (see FIGS. 4 and 5). In this case, the upper surface of the projection 34 is also tapered 40
Is formed as 4 and 5, reference numeral 42 indicates the tail end of the projection 34.

Next, as shown in FIG. 6, the projection 34 of the cylindrical member 12 formed as described above is positioned between the lower mold 44 and the ring member 46. The lower mold 44 has a cavity portion (recess) 48 corresponding to the chevron shape of the tip of the projection 34. On the other hand, according to the shape of the tail end portion 42 of the projection 34 of the ring member 46, the die-cutting direction (FIG.
For example, reverse tapered surfaces 50a and 50b inclined at about 3.5 degrees are formed toward the middle and upward directions, and as shown in FIG. It has a cavity portion (recess) 48 in which a similar reverse tapered surface 52 is formed corresponding to the shape. In practice, the ring member 46 is of a split movable type, and is preferably divided into nine along the circumferential direction. Here, the split movable die constituting the ring member 46 is provided on a surface of the lower die 44 so as to be movable by a predetermined distance by driving means (not shown), for example, a hydraulic cylinder.

Further, as shown in FIG.
The upper mold 60 is used for the lower mold 44 and the ring member 46.
Into each of the cavity portions 48. At this time, the protrusions 34 are pressed by the pressing force applied by the upper die 60.
In other words, the composition is deformed by the flow of the meat to form a mountain-shaped tooth tip 62 at one end, and the tail end 42 has a narrower end near the end. And the tooth portion 64 having a low height is formed. The teeth 64
Will have tapered surfaces 38a, 38b and 40.

When the synchronizer cone 10 as a finished product is obtained in this manner, the ring member 46 is slightly moved (for example, 0.2 mm) in the height direction of the tooth portion 64 on the lower mold 44. Then, the upper die 60 is retracted, and the synchronizer cone 10 having the teeth 64 formed thereon is taken out by a knockout pin (not shown) provided on the lower die 44 so as to be directed upward.

As described above, in the present embodiment, the teeth 6
Even if the tapered surface 4 has the tapered surfaces 36a and 36b, the synchronizer cone 10 having the inversely tapered tooth portion 64 can be obtained by plastically deforming in a single step.

[0022]

As described above, according to the method for manufacturing a synchronizer cone of a transmission clutch according to the present invention, a plurality of reverse tapered surfaces which are attached to a driven gear and gradually narrow toward the driven gear are formed. Prepare a ring-shaped molding material in which the main body portion and the tapered portion are integrally formed coaxially, and then the outer circumference of the main body portion is equally spaced along the axial direction. The notch is formed to form a plurality of protrusions in the approximate shape of the tooth portion to obtain an intermediate molded product, and then the protrusion of the intermediate molded product is replaced with a plurality of cavity portions corresponding to the tooth tip shape of the tooth portion. And a ring member having a reverse tapered portion formed in the mold opening direction of the upper die corresponding to the shape of the reverse tapered surface of the tooth portion, and a plurality of divided ring members provided on the lower die. And the shape on the tail end side of the tooth part Pushing molded directed into the lower mold and the ring member said projecting portion by an upper die having a corresponding shape to obtain this by completing a molded article. Further, the ring member is opened along the upper surface of the lower die, and the upper die is opened to take out a synchronizer cone as a completed molded product.

Therefore, the manufacturing process is simplified, and the effect that a synchronizer cone of the transmission clutch can be obtained at a low manufacturing cost is achieved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional perspective view of a synchronizer cone manufactured according to the present embodiment.

FIG. 2 is a partially omitted perspective view of a molding material used in the manufacturing method according to the present embodiment.

FIG. 3 is a partially omitted perspective view for explaining a state in which a projection is formed on a molding material used in the manufacturing method according to the present embodiment.

FIG. 4 is a front perspective view for explaining a state in which a tapered surface is applied to the protrusion shown in FIG. 3;

FIG. 5 is a rear perspective view for explaining a state in which a tapered surface is applied to the protrusion shown in FIG. 3;

FIG. 6 is a partial cross-sectional front view for explaining a state in which the protrusions of the molding material of FIG. 3 are tapered, and then the protrusions are positioned between a lower mold and a ring member.

7 is a partial cross-sectional front view for explaining a state in which the molding material of FIG. 6 is pressed and molded with an upper mold.

FIG. 8 is a partially omitted cross-sectional view for explaining a state in which a molding material is pressed and molded with an upper mold.

FIG. 9 is an explanatory longitudinal sectional view of a main part of a synchronizer cone and a synchronizing mechanism according to a conventional technique.

FIG. 10 is an explanatory plan view of a main part for explaining a state before a gear shift of a synchronizer cone and a synchronization mechanism according to the related art.

FIG. 11 is an essential part plan explanatory view for explaining a state after completion of a shift in a synchronizer cone and a synchronization mechanism according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Synchronizer cone 12 ... Cylindrical member 14 ... Tooth groove 16 ... Tooth part 18 ... Tooth tip part 20, 22, 24 ...
Inclined surface 26 ... Tapered portion 28, 36a, 36b, 38a, 38b, 40 ... Tapered surface 30 ... Circular projection 32 ... Material 34 ... Protrusion 42 ... Tail end 44 ... Lower die 46 ... Ring member 48 ... Cavity Parts 50a, 50b, 5
2: reverse tapered surface 60: upper die 62: tooth tip 64: tooth

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kimio Momose 8-1 Honcho, Wako-shi, Saitama F-term in Honda Motor Co., Ltd. Wako Factory (reference) 3J056 AA03 AA62 BA01 BE09 CA03 CA12 FA03 GA02 GA12 4E087 AA08 AA10 BA15 CA11 CA17 CA19 CA21 CA42 CB03 DA04 DA05 EC12 EC18 EC37 EC41 EC46 EC50 EC54 ED33 EE02 HA02 HA05 HA09 HB01 HB13

Claims (1)

[Claims] 1. A method of manufacturing a synchronizer cone for a transmission clutch having a plurality of teeth formed on a driven gear and having a plurality of teeth formed with an inversely tapered surface that gradually narrows toward the driven gear. Prepare a ring-shaped molding material integrally formed coaxially, and then cut out the outer periphery of the main body portion at equal intervals along the axial direction to form a plurality of protrusions of the tooth portion. Forming a schematic shape to obtain an intermediate molded product, and then, forming a projection of the intermediate molded product, a lower mold having a plurality of cavity portions corresponding to the tooth tip shape of the tooth portion,
A reverse tapered portion is formed in the mold opening direction of the upper die corresponding to the shape of the reverse tapered surface of the tooth portion, and is positioned between the ring member provided on the lower die and divided into a plurality. An upper mold having a shape corresponding to the shape of the tail end side of the tooth portion press-molds the protrusion to the lower mold and the ring member to obtain a completed molded product. Opening the mold along the upper surface of the lower mold and removing the synchronizer cone as the completed molded product by opening the upper mold.