JPH0113855Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in the material of a coupling sleeve that constitutes a part of a synchronizer in a transmission.

A typical example of the synchronizer is the so-called Warner type synchronizer. This is a system in which an insert key is interposed between the concentric coupling sleeve and the synchro hub, and the synchronizing torque of the balk ring is transmitted to the synchronizing hub using the insert key as a medium. Insert grooves for inserting the insert key are formed at three locations on the inner diameter spline teeth. FIG. 2 is a cross-sectional view of the insert groove of the coupling sleeve, and the insert groove 1a is generally located at the middle part of the inner diameter spline tooth 1 of the coupling sleeve material W forming the groove 1b into which a shift fork (not shown) is inserted. The material is processed by plastically deforming the material outward to form a relief tooth into which the insert is inserted.

By the way, as a suitable device for performing additional machining on both sides of a spline tooth so that a balk ring (not shown) can easily mesh with and disengage from the spline tooth on a tooth surface such as the spline tooth, there is a device shown in FIG. 1, for example. There is a structure. As shown in the figure, this includes a pair of gear-shaped impression processing tools 2 that mesh with an internal gear (inner diameter spline) 1 of the coupling sleeve material W that is the workpiece, and a pair of leveling processing tools 3. are rotatably provided respectively via eccentric shafts 4, and by rotating the shafts 4 slightly and slightly on their own axis, first, the internal gear 1 is pressed with the impression processing tool 2 to perform the desired machining. Then, correction processing such as deburring is sequentially performed using the break-in processing tool 3, following the processing tool 2.

With this device, the tooth profile on the machining tool side is evenly stamped onto the internal gear, so it is possible to reduce dimensional variations and improve machining accuracy, and it is also possible to perform repeated operations with a small amount of machining. Since this process is carried out, not only is no undue stress applied to the workpiece side, but also post-processes such as deburring can be omitted, which has many practical effects.

Here, when performing additional machining of the coupling sleeve using the aforementioned additional machining device, the coupling sleeve material W to be provided to the processing device has a uniform tooth thickness in advance as shown in FIGS. 3 and 4. The spline teeth 1 have been formed (at this stage, the above-mentioned relief teeth have not yet been formed), so if this material is used as is in the processing equipment described above, as shown in FIG. The spline teeth corresponding to the relief teeth mentioned above are also machined. However, since the additional machining part of the tooth is work hardened by this machining, the bottom part 1c of the groove 1b into which the shift fork is inserted is protrudingly deformed when machining the insert groove part 1a mentioned above, and the shift fork and the cup are It becomes impossible to smoothly engage the ring sleeve. As a result, it becomes necessary to rework the bottom part 1c using a large number of man-hours, so it is preferable to leave the bottom part 1c in its original shape without any processing at the time the processing by the processing device is completed.

This idea was made in view of the above circumstances, and in order to avoid machining the spline teeth corresponding to the insert grooves when additional machining is performed on the spline teeth, the spline teeth corresponding to the insert grooves are The main purpose is to set the tooth thickness smaller than other spline teeth in advance, thereby solving the above-mentioned conventional problems.

Next, one embodiment of this invention will be described in detail based on the drawings.

5 and 6 show a material for forming a coupling sleeve according to this invention. As mentioned above, this material W ₁ is pre-formed into almost the same shape as the product shape, and the inside diameter spline teeth 10 are formed in advance. There are 3 grooves at each of the 3 positions where the spline tooth 10 is divided into 3 equal parts, that is, the part that becomes the insert groove described above.
Individual spline teeth 11, 12, 1 with unequal tooth thickness
3 is formed. Among these unequal thickness spline teeth 11, 12, 13, the central spline tooth 1
1, the tooth thickness l ₁ is set smaller than the tooth thickness l ₂ of the other spline teeth, and the tooth height S ₁ is also set smaller than the tooth height S ₂ of the other spline teeth. For the adjacent left and right spline teeth 12 and 13, only the tooth thickness _l3 thereof is set smaller than the tooth thickness _l2 of the other spline teeth. That is, unequal thickness spline tooth 1
As shown in Fig. 5, teeth 1, 12, and 13 are each preformed in a shape in which only the hatched portion is removed compared to other spline teeth, and the tooth thickness of each tooth is l ₁ < l. The relationship is as follows: ₃ < l ₂ .

The tooth thickness l ₁ , l ₃ and the tooth height S ₁ , S ₂ of the unequal thickness spline teeth 11, 12, 13 are determined during post-processing only for these unequal thickness spline teeth 11, 12, 13. Needless to say, prices are set to take into account processing costs.

Therefore, according to the above configuration, when machining is performed using the additional machining device shown in FIG. 1, even when the impression processing tool 2 is engaged with the internal spline tooth 10 as shown in FIG. , both sides of the unequal thickness spline tooth 11 and the unequal thickness spline tooth 1
Since the impression pressure tooth profile 2a on the tool side does not come into pressure contact with one side of 2, 13, the spline teeth 11, 12, 1 with unequal tooth thickness corresponding to the insert groove described above are
Additional machining to 3 can be avoided.

Needless to say, spline tooth 1 with unequal tooth thickness
Spline groove 14a between 1 and 12 and spline groove 1 between unequal thickness spline teeth 11 and 13
4b will later become the insert groove. For reference, a conventional processing state is shown in FIG.

As is clear from the above explanation, according to this invention, the thickness of the spline tooth corresponding to the insert groove is set to be at least smaller than other spline teeth in advance to make the tooth thickness unequal. Additional machining for spline teeth with unequal tooth thickness can be avoided during additional machining, and the load during additional machining can be reduced and distortion after machining can be minimized.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the outline of an additional machining device for internal gears, Fig. 2 is a sectional view of the insert groove of a coupling sleeve, and Fig. 3 is an explanatory diagram showing the structure of a conventional coupling sleeve molding material. Fig. 4 is an enlarged view of part A in Fig. 3, Fig. 5 is an explanatory diagram showing the main parts of the material for forming a coupling sleeve in this invention, and Fig. 6 is an enlarged view of part A in Fig. 3. FIG. 7 is an explanatory diagram showing the processing state of the material, and FIG. 7 is an explanatory diagram also showing the conventional processing state. W ₁ ……Material for forming the cut-off sleeve, 1
0... Inner diameter spline tooth, 11, 12, 13...
Spline teeth with unequal thickness.

Claims (1)

[Scope of utility model registration request] A material for forming a coupling sleeve before additional processing is performed on pre-formed inner diameter spline teeth, in which some of the spline teeth corresponding to the insert groove are made larger than other spline teeth. A coupling sleeve molding material characterized by having a small tooth thickness.