KR102245307B1 - Manufacturing Method Of Pinion Gear For Adjusting Automobile Seat And Pinion Gear Manufactured Thereby - Google Patents

Abstract

The present invention relates to a manufacturing method of a pinion gear for adjusting an automobile seat, which is able to manufacture a pinion gear with a processed article made by cutting a coil wire or a round rod into a length corresponding to the volume of the pinion gear, comprising: a first upsetting step to perform a round molding on a corner of a cut surface of the coil wire or the round rod; a front extrusion step to extrude a front side to be made of a pivot bushing; a cross-sectional calibration step to calibrate the extruded front parts to meet the design dimensions of the pivot bushing; a gear extrusion step to extrude an output gear unit on a rear side of the pivot bushing and performing a round molding on the corner of the round rod unit on a rear side of the output gear unit; and a second upsetting step to pressurize a punch mold and molds a flange unit. There are a plurality of sets made of a dice and a punch, and each set performs each step. The processed articles between the steps are transferred by a transfer.

Description

Manufacturing Method Of Pinion Gear For Adjusting Automobile Seat And Pinion Gear Manufactured Thereby {Manufacturing Method Of Pinion Gear For Adjusting Automobile Seat And Pinion Gear Manufactured Thereby}

The present invention relates to a method of manufacturing a pinion gear for adjusting a vehicle seat, and to a pinion gear manufactured thereby, and more particularly, a fast rotation speed output from a motor among a driving device used to adjust the position of a vehicle seat is reduced to It relates to a method of manufacturing a pinion gear for transmission to a position adjustment rack and a pinion gear manufactured thereby.

A seat adjustment drive device used to adjust a seat position of an automobile often uses a planetary gear to reduce the rotation speed of the drive device motor to a high reduction ratio.

As an example of such a driving device for adjusting a seat, Korean Patent Application Laid-Open No. 10-2015-0128289 may be cited. The seat adjustment drive device uses a planetary gear to decelerate the rotational speed of the motor, and the seat position is slowly adjusted according to the rotational speed reduced by the planetary gear. The pinion gear is one of the parts for converting rotational motion into linear motion, and makes the position adjustment rack linear motion.

As shown in FIG. 1, the pinion gear 1 includes a flange portion 10 to which the planetary gear shaft 2 is press-fit, and an output gear portion 20 extending from the flange portion 10 to the front.

The central shaft (3) is inserted into the central shaft hole of the pinion gear (1), and the pivot bush (4) is mounted on the central shaft (3) exposed to the upper end of the output gear part (20) to support the output gear part (20). It is done.

The pinion gear includes a flange portion 10 having a plurality of insertion holes 5 into which the planetary gear shaft 2 is inserted, a central shaft hole penetrating the center to insert the central shaft 3, and an output gear portion formed at one end. The shape was very complicated, such as consisting of (20), and it was possible to manufacture only by sintering.

The pinion gear manufactured by sintering has a problem in that the pinion gear is fragile when the planetary gear shaft and the central shaft are pressed into the insertion hole and the central shaft hole/pivot bush, and the production cost is high.

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KR 10-2015-0128286 A, 2018.11.18. Fig. 6

The present invention was conceived to solve the problems of the prior art as described above, and as the pinion gear is produced by cold extrusion, it is possible to prevent the damage of the gear during shaft press fitting, and to facilitate mass production and to reduce the production cost. For that purpose.

In addition, another object of the present invention is to remove the press-fitting process by integrally manufacturing the pivot bush and to form the flange part after the output gear part is first formed.

The method of manufacturing a pinion gear for adjusting a car seat of the present invention
A plurality of sets consisting of the dies 100 and the punch 200 are provided, and each set performs each manufacturing step, and for manufacturing a pinion gear from a workpiece having a coil or round bar cut to a length corresponding to the volume amount of the pinion gear. In the manufacturing method,
A die mold 110 having a space of a shape to be deformed by inserting the workpiece 1 in the center, and supporting the workpiece 1 extruded in the die mold 110 or forming the workpiece 1 after forming a die mold (110) providing a die 100 made of a die pin 120 installed on the front of the die mold 110 to push it to the outside;
A punch pin 220 for pushing the workpiece 1 into the die mold 110 and pressing the workpiece 1 located in the die mold 110, a punch sleeve 230 for guiding the punch pin 220, and , Providing a punch 200 made of a punch mold 210 for fixing the punch sleeve 230 or pressing the workpiece 1 together with the punch pin 220;
The workpiece (1) is inserted into the die mold (110-1), the die pin (120-1) supports the workpiece (1), and the punch pin (220-1) moves forward to the cut surface of the workpiece (1). A first upsetting step in which the corners are rounded, and after the molding, the die pin 120-1 pushes the workpiece 1 to the rear;
The workpiece 1 that has passed the first upsetting step is inserted into the die mold 110-2, and the die pin 120-2 does not support the workpiece 1, and the punch pin 220-2 moves forward. A forward extrusion step of moving and forward extruding a front side to be formed of a pivot bush;
The die pin 120-3 having a protrusion for inserting the workpiece 1 through the forward extrusion step into the die mold 110-3 and forming a guide groove 7 in the workpiece 1 ) Support, and the punch pin 220-3 moves forward, and a cross-section correction step of correcting the front-extruded portion according to the design dimensions of the pivot bush;
The die pin 120-4 having a protrusion coupled to the guide groove 7 formed in the workpiece 1 and inserting the workpiece 1 that has undergone the cross-section correction step into the die mold 110-4 is the workpiece 1 ) To prevent rotation of the workpiece by the combination of the guide groove (7) and the protrusion without interfering with the forward movement, and the punch pin (220-4) moves forward, extruding the output gear to the rear of the pivot bush, A gear extrusion step of round-molding the round bar at the rear of the output gear unit;
The punch pin 220-5 pushes the workpiece through the gear extrusion step into the die 100-5, and the die pin 120-5 supports the workpiece 1, and a space as much as the flange portion to be formed is The formed punch mold 210-5 includes a second upsetting step of pressing the workpiece 1 together with the punch pin 220-5 to form a flange portion;

It is characterized in that the transfer of the workpiece between each step is performed by transfer.

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It is preferable that a part of the die mold can be replaced in the gear extrusion step or the second upsetting step.

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It is also desirable to correct the shape of the lower end of the output gear in the second upsetting step.

According to the present invention, it is possible to prevent the damage of the gear when the shaft is pressed into the pinion gear, mass production is easy, the production cost can be lowered, and the pivot bush is integrally formed to reduce the number of parts.

1 is a view showing a conventional pinion gear manufactured by sintering.
Figure 2 is a view showing the shape of the pinion gear manufactured according to the present invention.
3 is a cross-sectional view showing the shape of a pinion gear manufactured according to the present invention.
4 to 8 are diagrams showing dies and punches of each extrusion step.
9 and 10 are views showing the shape of the workpiece in each extrusion step.

Specific matters, including the problems to be solved, means for solving the problems, and effects of the invention as described above, are included in the following examples and drawings. Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings.

The terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.

Hereinafter, the present invention will be described in more detail according to an embodiment with reference to the accompanying drawings.

2 and 3 are perspective views and cross-sectional views showing the shape of a pinion gear for adjusting a vehicle seat manufactured according to an embodiment of the present invention.

The pinion gear 1 of the present invention includes a flange portion 10 having a plurality of insertion holes 5 into which a planetary gear shaft is to be inserted, and a central shaft hole 6 penetrating the center for insertion of the central shaft, and at one end. It is the same as the pinion gear manufactured by conventional sintering of FIG. 1 in that the formed output gear portion 20 is provided.

The shape of the pinion gear 1 of the present invention in that the pivot bush 4 is integrally formed so that the process of coupling the pivot bush 4 to the central axis can be omitted, and the number of parts can be reduced. There is an enemy difference. In the present invention, it is not in the form of a bush to be fitted as in the prior art, but the protruding portion is referred to as a "pivot bush" because it is the same in terms of function of supporting the pinion gear by protruding.

The method of manufacturing a pinion gear of the present invention relates to a cold extrusion method performed in a step prior to processing the insertion hole 5 and the central shaft hole 6 and the like.

The cold extrusion apparatus used in the present invention includes a die 100, a punch 200, and a transfer (not shown) as shown in FIGS. 4 to 8.
Components related to dies and punches differ in their shape at each step, so numbers (1-5) to distinguish them are added after the reference numeral in the form of'-number', and it is necessary to explain in common for all steps. If there is, it is indicated in a manner that does not include it.
In addition, since the present invention is to cold-extrusion molding in the form as shown in FIG. 2 by cutting the round bar, the workpiece 1 and the pinion gear 1 in each forming step use the same reference numerals, and the designations are also used interchangeably to be described. do.

The die 100 supports a die mold 110 having a space of a shape to be deformed by inserting the workpiece 1 in the center, and the workpiece to be extruded in the die mold 110, or a die mold for the workpiece after molding ( 110) It consists of a die pin 120 installed on the front of the die mold 110 to push to the outside.

The punch 200 is a punch pin 220 that pushes the workpiece 1 into the die mold 110 and presses the workpiece 1 located in the die mold 110, and a punch that guides the punch pin 220 It consists of a sleeve 230 and a punch mold 210 that fixes the punch sleeve 230 or presses the workpiece 1 together with the punch pin 220.

In the cold extrusion apparatus according to the present invention, dies and punches having respective shapes are arranged in a set in each extrusion step of molding into each shape of FIGS. 9 and 10, and in each extrusion step by a transfer (not shown) The next step is to transfer the workpiece. The transfer is usually in the shape of tongs, and when one step of extrusion is completed, the workpiece is picked up and transferred to the next step, whereby the punch pin inserts the workpiece into the die mold.

In the present invention, since the round bar is cut and cold-extruded in the form as shown in FIG. 2, the workpiece 1 and the pinion gear 1 in each forming step are described with the same reference numerals and titles.

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<Cutting step>

First, in order to manufacture a pinion gear, a coil or a round bar is cut. The coil or round bar of a certain diameter is cut into a length calculated to have a volume corresponding to the volume amount of the pinion gear to be manufactured. (Figure 9 (a) shape)

The cutting device is formed integrally with the device that performs the steps described below, so that the workpiece after cutting is moved by a transfer to the following first upsetting step, or a cutting device is separately provided and the cut workpiece is transferred to the first upsetting step. Can be supplied as

<First upsetting step>

The cutting step may have a burr or the like on the front surface thereof, and the cut edge is sharp, so that the die mold 110-1 is worn during extrusion molding, thereby reducing the life of the mold.

To prevent this, the front edge (A) of the workpiece 1 to be front-extruded by the die 100-1 and the punch 200-1 as shown in FIG. 4 is first rounded as shown in FIG. 9(b). You will go through the setting steps.

At this time, the die pin 120-1 supports the work so that the work 1 is not pushed toward the die pin 120-1.

After the punch pin 220-1 moves forward and the workpiece 1 is molded in the shape of Fig. 9(b) in the die mold 110-1, the die pin 120-1 pushes the workpiece backward. The output is transferred to the next step by the transfer.

<Forward extrusion step>

In the forward extrusion step, the die 100-2 and the punch 200-2 as shown in FIG. 5 are used to form the shape of FIG. 9(c).

At this time, the die pin 120-2 does not support the front surface of the workpiece 1 while the front end, that is, the part molded into the pivot bush 4 is extruded. This is to prevent the die pin 120-2 from being damaged because the extrusion speed of the workpiece is made at a high speed during forward extrusion.

<Section correction step>

Since the die pin 120-3 did not support the workpiece in the forward extrusion step, the shape and dimensions of the pivot bush 4 were not precisely molded, so the die 100-3 and the punch 200-3 as shown in FIG. ) Is precisely molded according to the shape and dimensions of the pivot bush designed using (Fig. 10(d)).

At this time, the die pin 120-3 has a protrusion for forming the guide groove 7 and a guide groove 7 is formed on the front surface of the pivot bush.

In this embodiment, the guide groove 7 is formed in a straight shape, but may be formed in various shapes such as a cross shape, a pyramid shape, and a star shape.

The die pin 120-3 naturally supports the front surface of the workpiece 1 to form the workpiece 1, and after the molding, the workpiece 1 is discharged to the rear.

<Gear extrusion stage>

Next, the output gear part is extruded in the form of FIG. 10(e) using a die 100-4 and a punch 200-4 in the form of FIG. 7.

The die pin 120-4 has a protrusion coupled to the guide groove 7 and prevents rotation of the workpiece by the combination of the protrusion and the guide groove 7.

The die pin 120-4 prevents rotation of the workpiece and does not prevent the workpiece from moving forward. The output gear unit 20 is extruded, and the round bar corner B at the rear of the output gear unit 20 is rounded. The round-shaped round bar edge (B) serves as a support for supporting the load so as not to influence the extrusion on the output gear unit 20 in the second upsetting step.

In addition, a die mold with reference numeral 112-4 to form the output gear and a die mold with reference numeral 111-4 that support the rest of the parts are separately provided to replace the molds that cause a lot of wear when forming the output gear. It is desirable to manufacture.

<The 2nd upsetting step>

In order to form the flange 1, as shown in FIG. 8, a space equal to the flange is formed in the punch mold 210-5. First, after the punch pin 220-5 pushes and presses the workpiece 1 into the die, the punch mold 210-5 and the punch pin 220-5 simultaneously press the workpiece to form a flange.

The die pin 120-5 supports the workpiece 1 so that volume flow does not occur.

At this time, in the post-forging process, the gear shape may be corrected to reduce the amount of processing at the bottom of the output gear.

Among the dies molds in the second upsetting step, the molds indicated by reference numeral 113-4 may be severely worn, so they can be replaced.

The pinion gear (FIG. 10(f)) that has completed the cold extrusion molding as described above is processed by drilling or the like in the insertion hole and the central shaft hole.

In each of the above steps, the workpiece moved to the transfer is inserted into the die mold by a punch pin.

In addition, each mold is preferably coated with a contact surface to minimize abrasion due to friction with the workpiece.

1: pinion gear, workpiece 2: planetary gear shaft 3: central shaft 4: pivot bush
5: insertion hole 6: central shaft hole 7: guide groove
10: flange portion 20: output gear portion
100: dies 110,111,112: die mold 120: die pin
200: punch 210: punch mold 220: punch pin 230: punch sleeve

Claims (5)

A plurality of sets consisting of the dies 100 and the punch 200 are provided, and each set performs each manufacturing step, and for manufacturing a pinion gear from a workpiece having a coil or round bar cut to a length corresponding to the volume amount of the pinion gear. In the manufacturing method,

A die mold 110 having a space of a shape to be deformed by inserting the workpiece 1 in the center, and supporting the workpiece 1 extruded in the die mold 110 or forming the workpiece 1 after forming a die mold (110) providing a die 100 made of a die pin 120 installed on the front of the die mold 110 to push it to the outside;

A punch pin 220 for pushing the workpiece 1 into the die mold 110 and pressing the workpiece 1 located in the die mold 110, a punch sleeve 230 for guiding the punch pin 220, and , Providing a punch 200 made of a punch mold 210 for fixing the punch sleeve 230 or pressing the workpiece 1 together with the punch pin 220;

The workpiece (1) is inserted into the die mold (110-1), the die pin (120-1) supports the workpiece (1), and the punch pin (220-1) moves forward to the cut surface of the workpiece (1). A first upsetting step in which the corners are rounded, and after the molding, the die pin 120-1 pushes the workpiece 1 to the rear;

The workpiece 1 that has passed the first upsetting step is inserted into the die mold 110-2, and the die pin 120-2 does not support the workpiece 1, and the punch pin 220-2 moves forward. A forward extruding step of moving and extruding a front portion of the pivot bush;

The die pin 120-3 having a protrusion for inserting the workpiece 1 through the forward extrusion step into the die mold 110-3 and forming a guide groove 7 in the workpiece 1 ) Support, and the punch pin 220-3 moves forward, and a cross-section correction step of correcting the front-extruded portion according to the design dimensions of the pivot bush;

A die pin 120-4 having a protrusion coupled to the guide groove 7 formed in the workpiece 1 by inserting the workpiece 1 that has undergone the cross-section correction step into the die mold 110-4 is used as the workpiece 1 ) To prevent rotation of the workpiece by the combination of the guide groove (7) and the protrusion without interfering with the forward movement, and the punch pin (220-4) moves forward, extruding the output gear to the rear of the pivot bush, A gear extrusion step of round-molding the round bar at the rear of the output gear unit;

The punch pin 220-5 pushes the workpiece through the gear extrusion step into the die 100-5, and the die pin 120-5 supports the workpiece 1, and the space as much as the flange portion to be formed is The formed punch mold 210-5 includes a second upsetting step of pressing the workpiece 1 together with the punch pin 220-5 to form a flange portion;

The method of manufacturing a pinion gear for adjusting a vehicle seat, characterized in that the transfer of the workpiece between each step is performed by a transfer.
delete The method of claim 1,
In the second upsetting step, the pinion gear manufacturing method for automobile seat adjustment, characterized in that to correct the shape of the lower end of the gear.
The method of claim 1,
The method of manufacturing a pinion gear for adjusting a car seat, characterized in that a part of the die mold can be replaced in the gear extruding step or the second upsetting step.
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