JPH0249817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of manufacturing gears having tooth profiles with unequal tooth thickness for use in automobile transmissions and the like.

<Summary of the gist> The present invention is applicable to the manufacture of transfer machines, etc. when manufacturing variable thickness tooth profile gears that are used as machine elements in transmissions etc. and have tooth profiles of variable tooth thickness arranged in a predetermined manner. The ring-shaped material fed into the device is press-formed into a chamfer surface using a transfer press, then extrusion molded to provide phasing for missing teeth, etc., to form the entire tooth profile, and then a burr integrated into the tooth profile is formed. After removing the teeth, a reverse taper is formed on the meshing surface of the tooth profile using a predetermined means, and one side of the meshing surface of the predetermined tooth profile is formed 0.1 to 0.2 mm thinner using a phasing posture via the missing tooth part. This invention relates to a method for manufacturing tooth profile gears with unequal tooth thickness, in particular, in the extrusion molding process, all tooth profiles are formed into tooth profiles with equal tooth thickness, and after the burr removal process, the tooth profile is formed into a tooth profile for reverse taper tooth forming. Ironing is carried out using a solid type ironing die equipped with a tooth profile for tooth preparation of unequal tooth thickness for the set tooth profile, and a reverse taper shape is given to all the tooth profiles, and a plurality of set tooth profiles of unequal tooth thickness are integrally molded. This invention relates to a method of manufacturing a tooth profile gear with unequal tooth thickness.

<Prior Art> As is well known, in an automobile transmission, a plurality of internal gears repeatedly engage and disengage with each other at high frequency. For this purpose, for example, in the tooth profile of a synchronizer ring as a gear, a reverse taper is provided on the meshing surface that is continuous with the channel face, and one side of the meshing surface of a predetermined tooth profile is provided with a tooth of equal tooth thickness. A so-called unequal tooth thickness tooth gear is used, which is formed into a tooth profile that is 0.1 to 0.2 mm thinner than the tooth profile, in order to improve shift feeling.

By the way, in manufacturing the uneven tooth gear,
The manufacturing method used follows the steps shown in Figures 1 to 6, and is manufactured using a transfer machine to ensure productivity.Each process will be briefly explained below, as shown in Figure 1. A ring-shaped material 3 having an outer shape 1 substantially matching the ring-shaped outer shape of a gear and having a shaft hole 2 formed therein by a predetermined processing is put into a press molding process of a transfer machine (not shown), and first, it is formed as shown in FIGS. 2a and 2b. Similarly, the chamfer surfaces 4, 4, .
are integrally press-formed so that the tooth profile spacing is uniform, and in the subsequent process, phasing of the tooth row in the circumferential direction is provided to ensure that each tooth profile is formed into a reverse tapered shape that functions to prevent pull-out. As shown in Figs. 3a and 3b, the missing tooth portion 5 is formed as a phase positioner, and one part of the tooth surface is formed from the equal thickness tooth profile 6, 6... groups and the regular tooth profile 6. The sides are extruded into tooth profiles 7, 7... groups with unequal tooth thickness and are 0.1 to 0.2 mm thinner (hatched portions in the figure) with a circular arc tooth thickness according to the design.

In this step, the burrs 8 are integrally bridged and left on the tooth profiles 6, 6, . . . of equal tooth thickness, and the tooth profiles 7, 7, .

Therefore, the process moves to the next stage of deburring, in which the toothless portion 5 is aligned and set, the burr 8 is removed as shown in FIGS. 4a and 4b, and the burr 8 is removed as shown in FIGS.
As shown in FIG. 6, by appropriate means, for example, the toothless part 5 is aligned with a die having tapered spline teeth in the inner hole, and the material 3 is set with the chamfer surface facing, and then pressed with a punch. Tooth profile 6, 7
A reverse taper with an inclination angle α is formed in the group, and a tooth profile with unequal tooth thickness is formed on the material 3 by thickening the plurality of spline teeth, so that a synchronizer ring 9 as a tooth profile gear with unequal tooth thickness is obtained. ing.

<Problems to be Solved by the Invention> By the way, as described above, in a series of steps following the channel forming step of the tooth profile extrusion molding step, the burr removal step, and the reverse taper molding step, uneven tooth thickness molded portions and chippings occur. A tooth mold having tooth-corresponding parts is used in each step and is sequentially molded.

In transfer molding, the material 3 and the tooth pattern are accurately transferred in set postures through phase determination, so there are no problems in each predetermined process, and therefore no product defects occur.

However, the number of processes involved in molding is large, and
If it is complicated, unforeseen factors such as rocking and vibration will cause the tooth row of the material 3 to shift in relative phase with the tooth profile in the circumferential direction. 6... and the unequal thickness tooth profile 7, 7... are machined so that the pitch of the tooth profile is shifted by an integral multiple, and as a result, the equal thickness tooth profile 6 is deburred with the corresponding tooth profile of the unequal thickness tooth profile 7. The problem was that it caused scratches on the tooth surface.

Furthermore, since the corresponding missing tooth shape of the missing tooth portion is out of phase, there is a problem in that the adjacent tooth profile is punched out and damaged.

Therefore, due to the occurrence of defective products, the yield of products is poor, leading to a decrease in productivity, resulting in high costs and material loss, which are disadvantageous.

The purpose of the present invention is to solve the problem of communication between processes in the production of tooth profile gears with unequal tooth thickness based on the above-mentioned conventional technology, and to solve the problem of communication between processes in the production of tooth profile gears with variable tooth thickness based on the above-mentioned conventional technology. In order to improve productivity without changing the basic process, we removed the above drawbacks while using a tooth profile with equal tooth thickness, and in the final process, we used a squeeze die to perform reverse taper molding for all tooth profiles. To provide an excellent method for manufacturing gears with variable thickness gears, which enables uniform tooth thickness gear formation and unequal tooth thickness tooth formation to be performed all at once with good workability, thereby benefiting the field of processing technology application in the machine manufacturing industry. It is something.

<Means for Solving the Problems> In order to solve the above problems, the structure of the present invention, which is based on the scope of the preceding claims, is as follows:
The ring-shaped material is put into a transfer process, the chimney surface is press-formed, and then a tooth profile is formed by extrusion molding.Furthermore, burrs attached to the tooth profile are removed to form a reverse taper-shaped tooth with an unequal tooth thickness profile. A method for manufacturing an array gear, in which all tooth profiles are formed into uniform tooth thickness tooth profiles by the above-mentioned extrusion molding, and after a burr removal process, a reverse taper tooth forming tooth profile and an unequal thickness tooth profile with respect to the set tooth profile are formed. This is a method for manufacturing a tooth profile gear with unequal tooth thickness, in which all tooth profiles are iron-molded using a solid type ironing die having a forming tooth profile.

<Operation> When a predetermined ring-shaped material is transferred to the transfer press, a chamfer surface is press-formed radially at the flange portion of the material through a predetermined punch, and then the chamfer surface is Extrusion molding is performed on all interdental parts that are continuous between the surfaces using a specified punch to form all tooth profiles with equal tooth thickness without missing teeth, and then deburring is performed using a specified punch. The burr remaining on the tooth profile of equal tooth thickness machined in the previous stage in a bridge manner is removed.
Therefore, in this series of processes, materials and
The phase shift in the direction of the tooth row of the tooth pattern is canceled out and there is no problem with transfer molding, and thus,
After transfer molding with reliable operation, the material is ironed using a solid type ironing die equipped with a reverse taper tooth mold and an unequal thickness tooth mold for the set tooth shape. The reverse tapered surface of the corner and the tooth profile of unequal tooth thickness are molded to a predetermined shape, eliminating the possibility of defects such as surface galling and tooth profile breakage during manufacturing, and making it possible to obtain a tooth profile gear of unequal tooth thickness. This is a technical measure.

<Embodiment> Next, an embodiment of the present invention will be described below with reference to the drawings from FIG. 7 onwards.

Note that the same parts as in FIGS. 1 to 6 will be described using the same reference numerals.

The process order of transfer molding for materials is essentially the same as in the conventional case, and as shown in Figure 7,
The ring-shaped material 3 of the gear is molded into the general outer shape 1 of a gear, and furthermore, a shaft hole 2 is formed in a predetermined central portion, and the ring-shaped material 3 is inserted into a predetermined transfer machine (not shown). First, as shown in Figures 8a and 8b, the chamfer surfaces 4, 4... are press-molded at set intervals on the flange part, and then tooth-less molded parts are formed on all the splines as tooth shapes. No. 9 was prepared using a normal type tooth mold (not shown) having a tooth preparation tooth mold of equal tooth thickness without
As shown in figures a and 9b, the material 3' is extruded and
Tooth profiles 6', 6', etc. of equal thickness are formed at equal intervals around the entire circumference.

Since the ring-shaped material 3' at this stage has not yet been formed with the tooth profile 7'' of unequal tooth thickness, which forms part of the gist of the present invention, the toothless portion used for phase positioning in the next and subsequent steps is There is no need for any formation.

When the material 3' is transferred to the next step, the deburring step, corresponding tooth shapes with the same tooth thickness are used for all tooth shapes even when processed in the deburring step, and the material 3' is processed in the deburring step. The pitch phase shift is canceled out between the tooth profile of equal tooth thickness formed on the material 3' and the predetermined tooth profile for deburring (not shown), and there is no problem of transfer between processes. As shown in Fig. 10b, the burr 8 remaining between the teeth of equal thickness 6', 6', .

Incidentally, at this point, the inverse taper and unequal tooth thickness tooth forming shapes are not formed, and each of the equal tooth thickness tooth shapes 6' has the same width as shown in FIG. 11 when viewed from the side.

In the next step, after the material 3' is lubricated, for example,
As shown in Fig. 2b, tapered surfaces S are provided at a taper angle of α on both sides of the spline mold in the portion corresponding to the tooth profile 6″, 6″, etc. of equal tooth thickness among the tooth rows of the tooth profile gear 9 with unequal tooth thickness. A tooth mold 10a for tooth preparation with a reverse taper,
A tapered surface S with a taper angle of α is provided on both sides of the spline mold in the portion corresponding to the unequal thickness tooth profile 7'', 7''..., and one side thereof is thicker with an arcuate tooth thickness of 0.1 to 0.2 mm than the constant thickness tooth profile. By using a ring-shaped solid type ironing die 10 which integrally has a tooth forming tooth profile 10b of unequal tooth thickness and provided with a reverse taper S', a tooth profile 6'', 6''... of equal tooth thickness of the material 3' is formed. group, and uneven tooth thickness tooth profile 7″, 7″...The group is squeezed and the first
As shown in Fig. 3, a reverse taper is formed on both sides of the tooth profile meshing surface of the material 3' to form a tooth profile gear 9 with unequal tooth thickness.
processing is completed.

Therefore, even if a phase shift occurs between the material 3' and the processing device, accurate processing can be smoothly performed without causing scratches or missing parts on the product.

It goes without saying that the embodiment of the present invention is not limited to the above-mentioned embodiments. For example, reverse taper forming is performed on all tooth profiles in two stages using a squeeze die, and reverse taper is performed once on all tooth profiles with equal tooth thickness in the previous stage. Primary forming, then uniform tooth thickness tooth profile, and
Various embodiments can be adopted, such as adding a secondary inverse taper to the tooth profile with unequal tooth thickness and ironing the tooth profile with unequal arc width and thin thickness.

<Effects of the Invention> As described above, according to the present invention, in a method for manufacturing a tooth profile gear with unequal tooth thickness such as a synchronizer ring by extrusion forging, the tooth profile can be adjusted from the initial stage forming of the channel face of the transfer forming of the ring-shaped material. By forming the tooth profile in the later stages of extrusion molding and deburring molding into a tooth profile with equal tooth thickness, there is no need for additional processing such as forming a tooth profile with unequal tooth thickness in these forming processes, improving processing accuracy. The tooth profile used in transfer molding is a tooth profile for tooth preparation with equal tooth thickness, and since all the tooth profiles of the material have no difference in shape in the circumferential pitch, the pitch phase between the material and the tooth profile is improved. Misalignment is canceled out and there is no communication problem in each process, eliminating the risk of galling on the tooth surface.Furthermore, missing teeth at the phasing position are not required, so burrs due to pitch misalignment of missing teeth are eliminated. There is no risk of tooth profile punching during the punching process, and excellent effects are achieved in that the occurrence of defective products and a decrease in yield are suppressed.

Furthermore, in each process of transfer molding, tooth molds for tooth preparation with unequal tooth thickness are not required, and only tooth molds for tooth preparation with uniform tooth thickness are used, so the workability and reliability of the transfer machine is improved. Not only can manufacturing be carried out at low cost, but it also eliminates the need for management such as preventing misalignment of the material and tooth pattern due to unexpected problems during transfer molding when connecting materials, making operation easier. This has the excellent effect of simplifying the work.

Furthermore, after deburring, a solid type ironing die is used to perform inverse taper forming on the tooth profile of the material with equal tooth thickness, and to form the tooth profile with unequal tooth thickness at the same time, which simplifies the manufacturing process and makes it easier to transport the workpiece. This has the advantage of simplifying the technology and reducing the incidence of defective products.

In addition, the unequal tooth thickness tooth forming mold and the uniform tooth thickness tooth forming mold that were added to each conventional molding process are performed at the same time as reverse taper molding, which simplifies the previous molding process and suppresses increases in manufacturing costs. Done, again.
For unequal tooth thickness tooth forming, uniform tooth thickness tooth forming, and reverse taper forming, ironing using a squeeze die prevents processing from separating, stabilizes forming accuracy, and improves product functions such as preventing gears from coming off. effect is produced.

This invention, for example, is used in the manufacture of synchronizer rings and provides a synchronizer ring with a tooth profile of unequal tooth thickness, which provides a sense of moderation in the shift feeling by enhancing the function of preventing the synchronizer ring from coming off, thereby ensuring reliable shift operation. It has the excellent effect of being able to perform

[Brief explanation of the drawing]

1 to 6 are explanatory diagrams of the manufacturing process of tooth profile gears with unequal tooth thickness in the prior art, and FIG. 1 is a cross-sectional view of a ring-shaped material;
Figures 4a and 4b are a cross-sectional view and a plan view of each processed material, Figure 3c is a partially enlarged perspective view, Figure 5 is a cross-sectional view of the product, and Figure 6 is a side view of the material as viewed from Figure 5.
7 to 13 are explanatory views of one embodiment of the present invention, and FIG. 7 is a cross-sectional view of the material, and 8a, 8b, 9
Figures a, 9b, 10a, and 10b are cross-sectional views and plan views of the raw materials after each process, Figure 9c is a partially enlarged perspective view, Figure 11 is a partial side view of the tooth profile before ladder forming, and Figures 12a and 12b are 13 is a perspective view and a plan view of the squeeze die, and FIG. 13 is a partial side view of the tooth profile. 3'...Ring-shaped material, 4...Channifer surface, 6,
6'...tooth profile, 8...burr, 7,7'...unequal tooth thickness tooth profile,
6″, 7″... Reverse tapered tooth, 9... Tooth profile gear with unequal tooth thickness, 10a... Tooth mold for inverse taper molding, 10b... Tooth mold for unequal tooth thickness tooth forming, 10... Shigoki die.

Claims (1)

[Claims] 1 Put the ring-shaped material into the transfer process,
In a method of manufacturing a gear with an inverted tapered tooth arrangement having an uneven tooth thickness tooth profile by press forming a channel face, then forming a tooth profile by extrusion molding, and then removing burrs attached to the tooth profile,
All the tooth profiles are formed into uniform tooth thickness tooth profiles by the above extrusion molding, and after the burr removal process, the entire tooth profile is formed using a solid type ironing die that has a tooth profile for inverse taper tooth formation and a tooth profile for unequal tooth thickness for the set tooth profile. A method for manufacturing a tooth profile gear with unequal tooth thickness, characterized in that the tooth profile is formed by ironing.