JPS62286842A - Manufacture of change lever and structure thereof - Google Patents

Abstract

PURPOSE:To reduce the labour in the welding process and assembly process and obtain the lightweight device by executing the cold forging after the spread pipe part formed at one edge of a pipe is formed into an intermediate spherical form through drawing work. CONSTITUTION:As to a change lever 1, a spherical part 5 is integrally formed onto the lower part of a tubular lever body 4 whose upper pipe part 3 is bent by a prescribed angle theta for the base part 2, and a short-tube-shaped connection part 6 is integrally formed onto the lower edge of the spherical part 5, and further a tapered part 7 is integrally formed at the top edge of the connection part 6 by the cold forging method through Press-work. A short-pipe-shaped pipe pivot 8 is fixed onto the taper part 7 by a welding means. Further, the tubular lever body 4 is formed into tapered form towards the top, and a screw part 9 is screwed onto the upper edge part of the tubular lever body 4.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (A) Field of the Invention This invention relates to a method for manufacturing a change lever such as a 9-speed lever for use in automobiles, trucks, agricultural machinery, and the like. and regarding its structure.

(O) Background of the Invention Conventionally, as the change lever of the above example, for example, the first
There is a lever with a structure as shown in Figure 0.

That is, on the outer periphery of the relatively short straight base pipe 101,
This spherical body 10 is fitted with a spherical body 102 made of synthetic resin.
2 is pivotally supported on a lever retainer (not shown), while a solid lever main body 103 is integrally connected to the upper part of the base tube 101 by welding means, and a change knob is attached to the upper end of this lever main body 103. At the same time, a pipe pivot 106 is integrally connected to the lower end of the base pipe 101 by welding means.
This is a change lever configured to connect the nitrogen rod 107.

However, the conventional change lever described above has the following problems.

In other words, since the lever main body 103 is in the shape of a solid round bar, vibrations from the engine and transmission section are directly transmitted to the change lever, causing the lever main body 103 to vibrate minutely.

In addition, since the main part of the change lever is formed of a total of three parts: the base tube 101, the spherical body 102, and the lever main body 103, there are many parts, and the base tube
1 and the lever body 103 had the problem of requiring a welding process.

Furthermore, since there are welded parts due to the above-mentioned welding process, there is a problem in that the mechanical strength of these welded parts tends to deteriorate.

Furthermore, due to the large number of parts mentioned above, there is a problem in that the number of assembly steps and management steps are large.

Moreover, since the lever main body 103 is in the shape of a solid round bar, it has a certain weight, and there is a problem in that the lever body 103 is prevented from being run over.

(c) Purpose of the Invention The first aspect of the present invention is to obtain a lightweight change lever with fewer welding and assembly steps by drawing a hollow change lever from a plastic metal pipe using a cold forging method. The purpose is to provide a manufacturing method that can.

A second aspect of the present invention aims to provide a change lever that is lightweight, has a small number of parts, is free from minute vibrations, and has high mechanical strength.

(d) Summary of the Invention The first invention of the present invention comprises a first step of press-fitting a punch into one end of a pipe of a predetermined length to form an expanded tube portion in a portion corresponding to the ball center of a lever to be processed; A first mold consisting of a pair of a lower mold and an upper mold that are disposed opposite each other at approximately the center of the lever is formed with a shape surface of an intermediate spherical shape that approximates the spherical part of the lever to be processed and an intermediate connecting shape that approximates the connecting part. A second step in which the approximate intermediate spherical part and the intermediate connecting part are formed by dividing and drawing the approximate intermediate spherical part and the intermediate connecting part by pressing the two dies, and a lower mold and an upper mold that are opposed to each other at approximately the center of the approximate intermediate spherical part. A pair of second molds is divided into two shapes: a sphere corresponding to the spherical part of the lever to be processed, and a connecting part corresponding to the connecting part, and the spherical part and the connecting part are formed by pressing these two molds. and a third step of drawing the change lever.

A second aspect of the present invention is a change lever in which a spherical portion is integrally formed at the lower part of a tubular lever main body, and a short tubular connecting portion is integrally formed at the lower end of the spherical lever body by press working.

(E) Effects of the Invention According to the first aspect of the present invention, one end of the pipe is expanded to form an expanded portion at the one end of the pipe, and then the expanded portion is drawn into an intermediate spherical shape and an intermediate connecting shape. This method produces a hollow change lever from a plastic metal pipe by cold forging the intermediate spherical part and the intermediate connecting part into the spherical part and the connecting part, so it is light and requires fewer welding and assembly processes. This has the effect of making it possible to obtain a change lever with a large mechanical strength.

According to the second aspect of the present invention, the spherical portion is integrally formed at the lower part of the tubular lever main body, and the short tubular connecting portion is integrally formed at the lower end of the spherical lever by press working, so that the change lever naturally becomes hollow. As a result, it is possible to reduce the weight of the change lever.

In addition, since the main body of the tubular lever, the ball part, and the connecting part are integrally formed, the number of parts is reduced, and mechanical strength can be increased because there are no welded parts on the main part of the lever. effective.

Furthermore, since the change lever is hollow, vibrations from the engine and transmission section can be absorbed by the hollow portion, which has the effect of preventing minute vibrations of the change lever.

Kube) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawings show a method of manufacturing a change lever and its structure. In FIG. 1, this change lever 1 has an upper tube portion 3 bent at a predetermined angle θ, for example, 15 to 20 degrees with respect to a base portion 2, at the bottom of a tubular lever main body 4. A spherical portion 5, a short tubular connecting portion 6 at the lower end of the spherical portion 5, and a tapered portion 7 at the tip of the connecting portion 6 are integrally formed by press working and cold forging.

Further, a short pipe pivot 8 is fixed to the tapered portion 7 by welding means.

Further, the above-mentioned tubular lever main body 4 is formed into a tapered shape having a large diameter at the lower part and a small diameter at the upper part, and a threaded part 9 is screwed into the upper end of the tubular lever main body 4.

The above-mentioned goo-engine lever 1 is put into use by having the ball part 5 pivoted to a lever retainer, connecting the pipe pivot 8 at the lower end to a change iron, and further attaching a change knob to the threaded part 9 at the upper end.

Next, a method for manufacturing the change lever 7 described above will be described.

First, as shown in FIG. 2, a No. 1 die 11 having a shaped surface 10 for first-stage pipe expansion is provided, and a pipe 13 is inserted into a bottomed cylindrical die hole 12 of the die 11.

Above) The pipe 13 (E) is made of plastic metal and has a predetermined length.

Then, as shown in FIGS. 2 and 3, the above-mentioned pipe 1
A first punch 14 is press-fitted into the upper end of the pipe 13 to form a first stage expanded pipe portion 15 at the upper end of the pipe 13.

After the first stage expanded tube portion 15 is formed, a stepped portion 16 is formed at the boundary between the pipe 13 and the first expanded tube portion 15 .

Moreover, the formation part of the first stage expanded tube part 15 shown in FIG.

J5, the above-mentioned No. 1 die 11 is provided with a knockout pin as necessary.

Next, as shown in FIG. 4, a shaped surface 17 for second-stage tube expansion, which has a larger hole diameter than the shaped surface 10 for first-stage tube expansion, is attached above the region corresponding to the step portion 16 described above. number 2 dice 1
8 is provided, and the above-mentioned pipe 13 is inserted into the bottomed cylindrical die hole 19 of the second die 18.

Then, as shown in FIGS. 4 and 5, a No. 2 punch 20 having a larger diameter than the outside diameter of the No. 1 punch 14 is press-fitted from the open end of the first stage tube expansion section 15, and the upper end of the pipe 13 is 1st to
A second stage expanded pipe portion 21 having a larger diameter than the stage expanded pipe portion 15 is formed. (First step) Next, as shown in FIG.
A first mold 24 consisting of a pair of molds 3 and 3 is provided.

The lower mold 22 and the upper mold 23 have intermediate spherical shaped surfaces 25 and 26, which are similar to the spherical part 5 in FIG. 1, divided into halves! :
11 is formed, and the upper die 23 is formed with an intermediate connecting surface 27 similar to the connecting portion 6 of FIG.

The pipe 13 on the front side is inserted into the hole 28 of the lower mold 22 formed in this way, and the upper mold 23 on the movable side is pressed against the lower mold 22 on the fixed side. The second stage expanded pipe portion 21 shown in FIG. 6 is plastically deformed, and an approximate intermediate spherical portion 29 d3 J and an intermediate connecting portion 30 as shown in FIG. 6 are drawn.

(Second Step) Next, as shown in FIG. 7, a second mold 33 is provided, which consists of a pair of lower mold 31 and upper mold 32, which are opposed to each other approximately in the center of the two approximate intermediate spherical parts.

The lower mold 31 and the -F mold 32 described above are formed with spherical shaped surfaces 34 and 35 that correspond to the spherical portion 5 in FIG. A connected shaped surface 36 corresponding to the connecting portion 6 is formed to be continuous with the above-mentioned spherical shaped surface 35.

The pipe 13 described above is inserted into the hole 37 of the lower mold 31 formed in this manner, and the upper mold 32 on the movable side is pressurized against the lower mold 31 on the fixed side. The two intermediate spherical parts and the intermediate connecting part 30 are plastically deformed, and the spherical part 5 and the connecting part 6 are drawn as shown in FIG. (Third step) Next, as shown in FIG. 8, a third mold 40 consists of a pair of a lower mold 38 and an upper mold 39 that are disposed opposite each other approximately in the center of the spherical part 5.
Pull the setting number.

The above-mentioned lower mold 38 and upper mold 39 have spherical shaped surfaces 41 and 42 corresponding to the outer shape of the spherical part 5 divided into halves, and the upper mold 39 has a connecting part corresponding to the outer shape of the connecting part 6. Shape surface 4
3 and a tapered shaped surface 44 corresponding to the tapered portion 7 in FIG. 1 are formed to be continuous with the above-mentioned spherical shaped surface 42.

Then, the upper mold 39 on the movable side is pressed against the lower mold 38 on the fixed side, and the end surface of the connecting part 6 is plastically deformed in an inclined shape in the axial direction, as shown in FIGS. 8 and 9. Thus, the tapered portion 7 is formed on the end surface of the above-mentioned connecting portion 6, and at the same time, the thickness of the connecting portion 6 is increased. (Fourth step) That is, in FIG. 9, when the thickness of the spherical portion 5 is tl and the thickness of the connection W6 is t2, the thickness of the connection portion 6 is increased so that tl minus t2. .

The pipe 13 below the ball portion 5 shown in FIG. 7 is plastically deformed into a predetermined shape as shown in FIGS. 8 and 9 through several drawing steps (not shown).

That is, the lower part of the above-mentioned spherical portion 5 is drawn into a tapered shape to form a tapered tubular lever main body 4 as shown in FIG.

Further, the tip of the tubular lever main body 4 is threaded to form the threaded portion 9 shown in FIG. The change lever 1 shown is formed.

In FIG. 1, a pipe pivot 8 is welded to the lower end of the tapered part 7, but since the above-mentioned connecting part 6 and tapered part 7 are thickened and the tapered part 7 is formed, the welding work is easy. This can be done easily, and the thicker the wall, the greater the strength.

Further, since the thickness of the threaded portion 9 described above can be increased by the same processing means, the threaded portion 9 can be maintained at a predetermined strength after thread cutting.

Moreover, since the hollow change lever 1 is drawn from the plastic metal pipe 13 by the cold forging method described above, it is possible to significantly reduce the weight compared to the conventional product shown in FIG. This has the effect of reducing manufacturing processes and assembly processes.

In addition, the number of parts can be significantly reduced compared to conventional products, which reduces the number of tube man-hours and provides a good external shape.

Furthermore, since it is possible to obtain a hollow change lever 1, when it is installed in a vehicle or other transmission part, the image from the engine and transmission part is absorbed by the hollow part, and the change lever 1 This has the effect of preventing minute vibrations.

Furthermore, since it is a cold-formed product, the surface is smooth, the dimensional accuracy is high, and there is no need for finishing or correction processing.

In addition, as shown in the embodiment, if the first step (see FIGS. 2 to 5) is made into a frequency step in which the diameter of the punch is gradually increased and the tube is expanded in sequence, the tube can be expanded smoothly and without strain. be able to.

In addition, No. 1 die 11, No. 2 die 18 and each lower mold 2
Of course, knockout bins can be provided at 2, 31, and 38 as necessary.

In the correspondence between the configuration of this invention and the above-described embodiment, the punches of this invention are the first punches 14 and 2 of the embodiment.
Corresponding to the number punch 20, the tube expansion portions are the first tube expansion portion 15 and the second tube expansion portion 21. However, the present invention is not limited to the configuration of the above-described embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a perspective view of a change lever, FIG. 2 is a sectional view showing the first step of pipe expansion, and FIG. 3 is a cross section showing the first step of pipe expansion. 4 is a sectional view showing the pre-stage process of the second stage of pipe expansion, FIG. 5 is a sectional view showing the second stage process of expanding the pipe, FIG. Figure 7 is a cross-sectional view showing the process of forming the spherical part, Figure 8 is a cross-sectional view showing the process of forming the tapered part, Figure 9 is an enlarged cross-sectional view of the liquid machining lever in the cold forging process, and Figure 10 is the conventional one. It is an explanatory view of the change lever of. 1... Change lever 5... Ball part 6... Connection part 7... Taper part 13... Pipe
14... No. 1 punch 15... 1st stage tube expansion part
20...2nd punch 21...2nd stage tube expansion part 22
．． 31...Lower mold 23.32...Upper mold 24.
...First mold 25, 26... Intermediate spherical shaped surface 27... Intermediate connecting shaped surface 29... Approximate intermediate spherical part 30... Intermediate connecting part 33
...Second mold 34.35...Spherical shaped surface 36...Connected shaped surface Fig. 13--Pipe 14...1 Punisher 5...Spherical part 6... Figure 9 on the platform Figure 10 Procedure nert 3 official book (self-motivated)

Claims (1)

[Claims] 1. A first step of press-fitting a punch into one end of a pipe of a predetermined length to form an expanded tube portion in a portion corresponding to the spherical portion of the lever to be processed; A first mold consisting of a pair of a lower mold and an upper mold is divided into two shapes: an intermediate spherical shape that approximates the spherical portion of the lever to be processed, and an intermediate connecting shape that approximates the connecting portion. a second step of drawing the approximate intermediate spherical part and the intermediate connecting part by press working of the mold; and a second mold consisting of a pair of a lower mold and an upper mold that are opposed to each other at approximately the center of the approximate intermediate spherical part. In the third step, the spherical part corresponding to the spherical part of the lever to be processed and the connecting part corresponding to the connecting part are formed separately, and the spherical part and the connecting part are drawn by press working of both types. A method of manufacturing a change lever formed by 2. The method for manufacturing a change lever according to claim 1, wherein the first step is a plurality of steps of sequentially increasing the diameter of the punch and expanding the tube. 3. Continuing from the third step, the end surface of the connecting portion is press-pressed in an inclined shape in the axial direction to form a tapered portion on the end surface of the connecting portion, and at the same time, a fourth step of increasing the wall thickness of the connecting portion. A method for manufacturing a change lever according to claim 1, comprising: 4. A change lever in which a spherical part is integrally formed at the lower part of the tubular lever main body, and a short tubular connecting part is integrally formed at the lower end of the spherical lever by press working.