JPH09317883A - Shift fork moving shaft for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve connecting workability by constituting a shaft for moving a shift fork in a transmission by inserting an axial part in the inserting hole of a yoke part, welding a projection for welding on a joining inner surface, and joining the shaft part and the yoke part to each other. SOLUTION: A shaft part 1 consists of a head part 11a and an shaft part 12, and a welding projection 13 is formed on the seat surface of the head part 11a. A groove and the like are formed on the top surface of the head part 11a so as to form a positioning mark 14, and knurled work is carried out on the neck lower part 15a directly under the head part 11a. A yoke part 2 to connected to the shaft part 1 is provided with two plate bodies 21a expanded in a circular arc shape and a plate body 21b for connecting them to each other, and a connecting part 23 is continuously connected with two plate bodies 21a. In the case of joining, the neck lower part 15a is pressfitted into the hole 24a of the yoke part 2 after the mark 14 of the head part 11a and the mark 26 of the joining part 22a are matched with each other, and the welding projection 13 is welded on the inner surface of the joining part 22a by means of welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift fork moving shaft of a transmission for moving a shift fork in a transmission in conjunction with a shift lever.

[0002]

2. Description of the Related Art As shown in FIG. 6, an operating mechanism of a transmission a is a series of mechanisms for moving a shift fork c in the transmission a by operating a shift lever b to mesh gears. The mechanism shown in FIG. 6 is called a direct control system, and is configured so that the shift levers b are operated to select the shift forks c1 to c3 through the shift fork moving shaft d to mesh with the gears. ing.

[0003]

7 to 9 show a shift fork moving shaft d used in the direct control system. One end of this shaft d is
Is connected to the shift lever b through the yoke e. The yoke e is a jig having a U-shaped cross section, and a connecting cylinder f having a through hole is integrally joined. The shaft d is integrally connected to the yoke e by inserting one end into the connecting tube f and inserting a pin h into a through hole g crossing the connecting tube f and the shaft d. However, in the case of such coupling by the pin h,
Since high accuracy is required for the through hole g formed in the coupling cylinder f and the shaft d, quality control becomes difficult. Further, since the structure is complicated, the cost becomes high and the connecting work becomes complicated.

The present invention has been made in order to solve the above-mentioned problems, and has a simple structure, which is low in cost, allows easy quality control, and facilitates joining work. An object of the present invention is to provide a shaft for moving a shift fork of a transmission capable of moving.

[0005]

As a means for solving the above problems, a shaft for moving a shift fork in a transmission in conjunction with a shift lever includes a head having a welding projection and a shaft. A shaft portion, a coupling portion for coupling the shaft portion, an insertion hole for inserting the shaft portion formed in the coupling portion, and a yoke portion having a coupling portion for the shift lever. A shift shift for a transmission, characterized in that the shaft portion and the yoke portion are coupled by inserting the shaft portion into the hole and welding the welding projection to the inner surface of the coupling portion. Providing a moving shaft. In this case, a structure in which the welding projection is formed on the seat surface of the head or a structure on the peripheral surface of the head can be adopted. Further, instead of forming the welding protrusion on the head portion of the shaft portion, the welding protrusion is formed on the inner surface of the joint portion of the yoke portion, and the welding protrusion is welded to the head portion of the shaft portion, so that It is also possible to adopt a structure for connecting the yoke portion. In this case, the welding projection may have a structure formed at a position where it is welded to the seat surface of the head or a structure formed at a position where it is welded to the peripheral surface of the head. Further, in all of the above cases, it is possible to employ a structure in which a mark for positioning the coupling between the shaft portion and the yoke portion is provided on the head portion of the shaft portion and the inner surface of the joint portion of the yoke portion. Further, the head side end of the shaft portion of the shaft portion and the insertion hole of the yoke portion are formed in the same non-circular shape so that the coupling between the shaft portion and the yoke portion can be positioned. You can also use what you have done. further,
Also adopted is that the head portion of the shaft portion and the joint portion of the yoke portion are formed in a shape that regulates the rotation of the head portion so that the joint between the shaft portion and the yoke portion can be positioned. it can.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. <A> Shaft Section As shown in FIGS. 1 and 2, the shaft section 1 is composed of a head section 11a and a shaft section 12, and a welding projection 13 is formed on the seat surface of the head section 11a. Further, a groove or the like is formed on the top surface or the like of the head portion 11a and a mark 14 for positioning at the time of coupling is provided. Furthermore, it is preferable to knurl the lower neck portion 15a immediately below the head portion 11a. The shaft 1 is made non-heat treated by heat treatment to secure its strength by cold drawing, and the material is dropped to enable projection welding with the yoke.

<B> Yoke portion The yoke portion 2 forms a connecting portion 22a by two plate members 21a facing each other and bulging outward in an arc shape, and a plate member 21b connecting them. Further, the two plate members 21a are extended in parallel and bulged upward to form the connecting portion 23. An insertion hole 24a having a diameter substantially equal to the diameter of the shaft portion 12 of the shaft portion 1 is formed in the substantially central portion of the plate body 21b, and the connecting portion 2
A hole 25 for connecting the shift lever is provided also in the center of 3.
Has been established. Further, a mark 26 for positioning at the time of coupling is provided on the peripheral portion of the insertion hole 24a.

<C> Coupling After the mark 13 of the head portion 11a and the mark 26 of the joint portion 22a are aligned to position the joint, the insertion hole 24a of the yoke portion 2 is formed.
The lower neck portion 15a of the shaft portion 1 is press-fitted therein, and the welding projection 13 is joined to the joint portion 22 by projection welding.
It is welded to the inner surface of a (welding portion 16a). by this,
The shaft portion 1 and the yoke portion 2 can be accurately positioned while being firmly connected.

[0009]

Other Embodiments As shown in FIG. 3, the lower neck portion 15b of the shaft portion 1 and the insertion hole 24b of the yoke portion 2 are formed in the same non-circular shape, and they are simply matched. It is also possible to adopt a structure which is capable of positioning the coupling between the shaft portion 1 and the yoke portion 2.

Further, as shown in FIG. 4, two planes 17 of the head portion 11b of the shaft portion 1 are cut to form parallel flat portions 17, and two plate members 21c of the yoke portion 2 facing each other are formed. To form a coupling portion 22b, and the head portion 11b is fitted to the coupling portion 22b to regulate the rotation so that the shaft portion 1 and the yoke portion 2 can be positioned relative to each other. You can also do it.

Further, as shown in FIG. 5, a welding projection is formed on the peripheral surface (the flat surface 17 or the like) of the head portion 11b of the shaft portion 1 and is welded to the inner surface of the joint portion 22b of the yoke portion 2. It may be (welded portion 16b). When the welding projection 13 is provided on the seat surface of the head portion 11a of the shaft portion 1 as described above, the head portion 11a is moved to the welding portion 2 after the welding temperature is reached by energizing.
Then, the protrusions 13 for welding are pressed against the plate body 21b, and the welding is performed by crushing the protrusions 13 for welding.

Therefore, during welding work, the shaft portion 1
Need to be inserted into the vertical hole of the jig and held upright. Therefore, it takes time and effort to insert the shaft portion 1 into the vertical hole of the jig, which leads to a reduction in workability in mass production.

On the other hand, when a welding projection is formed on the peripheral surface of the head portion 11b of the shaft portion 1 as shown in FIG. 5, the shaft portion 1 is placed laterally on the recess of the jig. Only by pressing the yoke portion 2 in a stable state, welding work can be performed. Therefore, it is possible to save the labor of inserting the jig into the vertical hole as described above, and it is possible to improve the workability in mass production.

Incidentally, instead of forming the welding projection on the head portion of the shaft portion, it is formed on the inner surface of the joint portion of the yoke portion, and the welding protrusion is welded to the head portion of the shaft portion. A structure in which the portion and the yoke portion are connected can also be adopted. In this case, the welding projection may have a structure formed at a position where it is welded to the seat surface of the head or a structure formed at a position where it is welded to the peripheral surface of the head.

[0015]

As described above, according to the present invention, it is not necessary to connect the shaft portion and the yoke portion with the pin, and the connection can be easily performed by the projection welding.
Quality control can be facilitated. Further, since the yoke can be integrally formed and no pin hole or pin is required, the structure is simple and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of an embodiment with a positioning mark.

FIG. 3 is an explanatory view of an embodiment in which a lower neck for positioning is formed.

FIG. 4 is an explanatory view of an embodiment capable of restricting rotation of the shaft head.

FIG. 5 is an explanatory diagram of an embodiment in which welding is performed on the peripheral surface of the shaft head.

FIG. 6 is an explanatory diagram of a conventional technique.

FIG. 7 is an explanatory diagram of a conventional technique.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tsutomu Niimi 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Takashi Umeda 2-20, Kawanami-cho, Atsuta-ku, Nagoya, Aichi Aichi Machine Industry Co., Ltd.

Claims (9)

[Claims] 1. A shaft for moving a shift fork in a transmission in cooperation with a shift lever, a shaft portion including a head portion having a welding protrusion and a shaft portion, and a coupling portion for coupling the shaft portion. And a yoke portion having an insertion hole for inserting the shaft portion opened in the joint portion and a connecting portion of the shift lever, the shaft portion being inserted into the insertion hole, and the welding projection. A shaft for moving a shift fork of a transmission, characterized in that the shaft portion and the yoke portion are joined by being welded to the inner surface of the joining portion. 2. The shaft for moving a shift fork of a transmission according to claim 1, wherein the welding projection is formed on a seat surface of the head. 3. The shaft for shifting a shift fork of a transmission according to claim 1, wherein the welding projection is formed on the peripheral surface of the head. 4. A shaft for moving a shift fork in a transmission in conjunction with a shift lever, comprising: a shaft portion having a head portion and a shaft portion; and the shaft portion having a welding projection on an inner surface thereof. A connecting portion, an insertion hole for inserting the shaft portion opened in the connecting portion, and a yoke portion having a shift lever connecting portion. The shaft portion is inserted into the insertion hole, A shaft for shifting a shift fork of a transmission, characterized in that the shaft portion and the yoke portion are connected to each other by welding a welding projection to the head portion. 5. A shaft for moving a shift fork of a transmission according to claim 4, wherein the welding projection is formed at a position where the welding projection is welded to the seat surface of the head. 6. The shift fork shift shaft for a transmission according to claim 4, wherein the welding projection is formed at a position where the welding projection is welded to the peripheral surface of the head. 7. The head of the shaft portion and the inner surface of the joint portion of the yoke portion are provided with marks for positioning the joint between the shaft portion and the yoke portion. 6. A shaft for moving a shift fork of a transmission according to any one of 6. 8. A shaft-side end portion of the shaft portion of the shaft portion and an insertion hole of the yoke portion are formed in a non-circular shape having the same shape to position the shaft portion and the yoke portion. 7. A shaft for moving a shift fork of a transmission according to any one of claims 1 to 6, which is configured to be able to perform. 9. The head portion of the shaft portion and the joint portion of the yoke portion are formed in a shape that restricts the rotation of the head portion so that the joint between the shaft portion and the yoke portion can be positioned. The shaft for moving a shift fork of a transmission according to any one of claims 1 to 6, which is configured.