JPH05104324A - Manufacture of coupling sleeve for manual transmission - Google Patents

Abstract

PURPOSE:To provide a method of manufacturing a coupling sleeve for a manual transmission whereby a coupling sleeve with a very small rate of distortion can be manufactured, resulting in maintenance or enhancement of a good feeling in controlling a lever during a shift. CONSTITUTION:A plurality of inner teeth 12 of equal thickness are formed by spline broaching in a blank 10a of a coupling sleeve. Next, the plurality of inner teeth 12 are subjected to uniform inversed tapering press working to form an inversed tapered portion 14 on the toothed face of each of the inner teeth 12 and then predetermined ones of the inner teeth 12 are subjected to broaching for tooth removal so as to form a tooth-removed portion 13 from which the inner teeth 12 are removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a coupling sleeve used in a manual transmission of an automobile.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, the above-mentioned coupling sleeve 51 used in a manual transmission of an automobile is provided with a plurality of internal teeth 52 having reverse taper portions 54 on their tooth surfaces, and these The predetermined internal tooth 5 of the internal teeth 52
2 is provided with a thin tooth portion 53 (or a toothless portion from which a predetermined inner tooth 52 is removed) having a reduced tooth thickness, and is conventionally used for manufacturing such a coupling sleeve 51 for a manual transmission. First, the coupling sleeve semi-finished product is subjected to spline broaching with a broaching machine to form a plurality of inner teeth 52 having the same tooth thickness on the coupling sleeve semi-finished product. At this time, portions of the predetermined inner teeth 52 indicated by imaginary lines in FIG. 6C are simultaneously scraped off by the broach for reducing the tooth thickness, and thin tooth portions 53 are simultaneously formed.

Next, reverse taper press working is applied to the inner teeth 52 having the normal tooth thickness of the coupling sleeve semi-finished product. That is, after the semi-finished coupling sleeve product is set on a jig having a housing having a diameter substantially the same as the outer shape of the semi-finished coupling sleeve product, the semi-finished coupling sleeve product is placed inside the semi-finished coupling sleeve product. An expanding tool for forming an inverse tapered portion 54 of a predetermined shape that meshes with the inner teeth 52 formed in the above and has a tooth thickness slightly larger than the width of the tooth groove of the inner teeth 52 is attached, and the expanding tool is attached. Is enlarged to form the inverse taper portion 54 shown in FIG. After this, deburring broaching is performed to produce burrs 5 generated during reverse taper press working.
4a was removed.

[0004]

Here, in the case of operating the shift lever of the manual transmission of the automobile to perform the shift change, the structure shown in FIG. 9 (a) manufactured as described above is used.
The shift position is changed by moving the coupling sleeve 51 schematically shown in (b). The lever operation feeling at this time is the distortion of the coupling sleeve 51 (particularly the circle shown in FIGS. 9A and 9B). Circumferential strain ε)
Is strongly involved. That is, as shown in FIG. 8, at the time of shift change, there are usually three peaks from the start to the end of the operation, but if the load F at the second step is small, the feeling of operation becomes good. Therefore, the feeling of lever operation is greatly influenced by the load F with two steps.

However, in the above-described conventional method for manufacturing a coupling sleeve, reverse taper press working is applied to the inner teeth 52 of the coupling sleeve semi-finished product in which the thin tooth portion 53 (or toothless portion) is formed. At the time of performing, the centrifugal force acts on the inner teeth 52 having the same tooth thickness, but the centrifugal force hardly acts on the thin tooth portion 53 (or toothless portion). The ring sleeve 51 may have a circumferential strain ε that influences the two-step load F during the reverse taper press working, and this may maintain or improve a good lever operation feeling. It was an obstacle.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it becomes possible to manufacture a coupling sleeve with less distortion, and as a result, the lever operation feeling of the manual transmission is improved. It is an object of the present invention to provide a method of manufacturing a coupling sleeve for a manual transmission, which can be made of various materials.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of inner teeth having an inverse taper portion on a tooth surface are provided, and a toothless portion in which the inner teeth are removed or a thin tooth in which the tooth thickness of the inner teeth is reduced. When manufacturing a coupling sleeve for a manual transmission having a portion, a spline broaching process is performed to form a plurality of inner teeth with the same tooth thickness on the coupling sleeve semi-finished product, and an inverse taper is applied to the plurality of inner teeth. After forming a reverse taper portion on each tooth surface of the internal tooth by performing press working,
A broaching process for missing teeth or reducing the tooth thickness is performed on a predetermined inner tooth to form a missing tooth portion where the inner tooth is removed or a thin tooth portion where the tooth thickness of the inner tooth is reduced. The configuration of the method for manufacturing a coupling sleeve for a manual transmission is used as a means for solving the above-mentioned conventional problems.

[0008]

In the method of manufacturing the coupling sleeve for the manual transmission according to the present invention, the reverse taper press working is applied to all the inner teeth having the same tooth thickness formed on the coupling sleeve blank. Therefore, the centrifugal force acts evenly on all the internal teeth, and the coupling sleeve is hardly distorted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of a method for manufacturing a coupling sleeve for a manual transmission according to the present invention.

The manual transmission 2 of the automobile 1 shown in the drawing has a coupling sleeve 10 in a housing 3.
By operating the lever 4, the coupling sleeve 10 is moved along the synchro hub 6 via the shift fork 5, and is synchronized with the gear (second speed gear) 9 via the outer turbo ring 7 and the inner balk ring 8. There is.

The coupling sleeve 10 has a groove portion 11 which fits with the shift fork 5 on the outer periphery thereof, and an inner tooth 12 which meshes with the synchro hub 6, and in this case, the coupling sleeve. On the inner peripheral side of 10, toothless portions 13 are provided at intervals of 60 °. Further, an inverse taper portion 14 is formed on each tooth surface of the inner tooth 12 to prevent the gear 9 from coming off due to transmission torque or road surface irregularities.

The coupling sleeve 1 having such a structure
In manufacturing 0, first, spline broaching is performed to form inner teeth 12 having the same tooth thickness on the inner peripheral side of the coupling sleeve semi-finished product 10a over the entire circumference as shown in FIG. 1 (a). .. Next, as shown in FIG. 1B, inverse taper press working is uniformly applied to all the internal teeth 12 to form inverse tapered portions 14 on the tooth surfaces of the internal teeth 12, respectively.

Thereafter, as shown in FIG. 1C, the coupling sleeve blank 10a is subjected to broaching for missing teeth to remove predetermined internal teeth 12, and the missing tooth portion 1 is formed on the inner peripheral side.
The coupling sleeve 10 is obtained by forming 3 at 60 ° intervals.

Therefore, when the reverse taper press working is performed, since the inner teeth 12 having the same tooth thickness are still formed on the inner circumference side of the coupling sleeve semi-finished product 10a over the entire circumference, all the inner teeth 12 are formed. The centrifugal force of the press acts evenly, and the coupling sleeve 10 is hardly distorted.

Next, the state of occurrence of distortion when a coupling sleeve is manufactured by the method for manufacturing a coupling sleeve for a manual transmission according to the present invention, and a missing tooth by a conventional method for manufacturing a coupling sleeve for a manual transmission. Comparing with the situation of occurrence of distortion when manufacturing a coupling sleeve having a portion, in the method for manufacturing a coupling sleeve for a manual transmission according to the present invention, as shown in FIG. (A)), reverse taper press step B (state of FIG. 1 (b)) and toothless broaching step C (state of FIG. 1 (c)). It only happened.

On the other hand, in the conventional method for manufacturing a coupling sleeve for a manual transmission, as shown in FIG.
Almost no distortion occurs in the coupling sleeve blank 61a after the spline broaching process P (state of FIG. 11A), which is also performed by the broaching process for missing teeth, but the reverse taper pressing process Q (FIG. 11). (State of (b))
And deburring broach process R (state of FIG. 11 (c))
11 (b) (c) is attached to the coupling sleeve semi-finished product 61a and the coupling sleeve 61 at the stage after passing through
It was found that a strain of more than 80 μm occurred as shown by a virtual line.

Thus, it has been proved that the method of manufacturing a coupling sleeve for a manual transmission according to the present invention can manufacture a coupling sleeve having much less distortion than the conventional one.

[0019]

As described above, in the method for manufacturing a coupling sleeve for a manual transmission according to the present invention, a spline broaching process is performed to form a plurality of inner teeth having the same tooth thickness on the coupling sleeve blank. A broach for missing teeth or reducing the thickness of a predetermined inner tooth after forming a reverse taper portion on each tooth surface of the inner tooth by performing a reverse taper press working on the plurality of inner teeth Since the processing is performed to form a toothless portion where the inner teeth are removed or a thin tooth portion where the tooth thickness of the inner teeth is reduced, it is possible to manufacture a coupling sleeve with extremely little distortion. As a result, a very excellent effect of maintaining or improving a good lever operation feeling during a shift change is brought about.

[Brief description of drawings]

FIG. 1 (a) is a schematic front view of a coupling sleeve semi-finished product after spline broaching showing one embodiment of a method for manufacturing a manual transmission coupling sleeve according to the present invention. (B) It is a schematic front view of the coupling sleeve semi-processed product after reverse taper press processing. (C) It is a schematic front view of the coupling sleeve obtained by performing the broaching process for toothless.

FIG. 2 is a side view showing a state in which a manual transmission is installed in an automobile.

FIG. 3 is a partially cutaway side view showing the manual transmission shown in FIG. 2 in an enlarged manner.

4 is an exploded perspective view showing in detail a coupling sleeve portion of the manual transmission shown in FIG.

FIG. 5 is a graph showing, in the order of steps, strains generated when a coupling sleeve is manufactured by the method for manufacturing a coupling sleeve for a manual transmission according to the present invention.

FIG. 6 (a) is a front view showing a coupling sleeve manufactured by a conventional method for manufacturing a manual transmission coupling sleeve. (B) It is sectional drawing of the coupling sleeve shown in FIG.6 (a). (C) It is a partial enlarged view showing a tooth thickness reduced portion of the coupling sleeve shown in FIG. 6 (a).

FIG. 7 is a partially enlarged view from the center direction of the inner teeth of the coupling sleeve shown in FIG. 6 (a).

FIG. 8 is a graph showing a two-step input load when operating a shift lever of a manual transmission.

FIG. 9 (a) is a schematic side view of a coupling sleeve showing a distortion that has occurred in the coupling sleeve manufactured by the conventional method for manufacturing a manual transmission coupling sleeve. (B) It is a schematic half front view of the coupling sleeve shown in FIG. 9 (a).

FIG. 10 is a graph showing, in the order of steps, the distortion generated when a coupling sleeve is manufactured by a conventional method for manufacturing a coupling sleeve for a manual transmission.

FIG. 11A is a schematic front view of a coupling sleeve semi-finished product after performing spline broaching and dent broaching at the same time as a conventional method of manufacturing a coupling sleeve for a manual transmission. (B) It is a schematic front view of the coupling sleeve semi-processed product after reverse taper press processing. (C) It is a schematic front view of the coupling sleeve obtained after removing the flash produced in the coupling sleeve semi-finished product after reverse taper press working.

[Explanation of symbols]

 2 Manual transmission 10 Coupling sleeve 10a Coupling sleeve semi-finished product 12 Inner teeth 13 Partial tooth part 14 Reverse taper part

Claims (1)

[Claims] 1. A manual transmission, comprising a plurality of internal teeth each having a reverse taper portion on a tooth surface, and a toothless portion from which the internal teeth are removed or a thin tooth portion in which the tooth thickness of the internal teeth is reduced. When manufacturing a coupling sleeve, a spline broaching process is performed to form a plurality of inner teeth having the same tooth thickness on the coupling sleeve semi-finished product, and the inner teeth are formed by performing an inverse taper press working on the plurality of inner teeth. After forming an inverse taper portion on each tooth surface of the tooth, the tooth missing portion or the tooth of the inner tooth is removed by performing a broaching process on the predetermined inner tooth for missing tooth or reducing tooth thickness. A method for manufacturing a coupling sleeve for a manual transmission, which comprises forming a thin tooth portion having a reduced thickness.