JP2005113936A - Joint member and its machining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a machining time and thus reduce machining cost and product cost by eliminating the need for conventional cutting work starting in the state in which no shaft hole (serration groove hole) and cut split exist in machining a joint element or a yoke and to improve the strength of the joint element or the yoke by avoiding the cutting of a metal flow as in the conventional cutting work. <P>SOLUTION: The joint member comprises the cut split 13 provided near the base end, a tubular joint cylinder portion 11 having the shaft hole for fitting a shaft, a pair of flange portions 16, 17 provided integrally with the joint cylinder portion 11 with the cut split 13 therebetween, a thread hole 18 formed in one of the flange portions 16, 17, and a through-hole 19 concentrically formed in the other flange portion, through which a bolt to be threaded to the thread hole 18 is inserted. The shaft hole and the cut split 13 are formed at the same time by forging. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint member for use in an automobile steering device and a joint member forming a yoke of a universal joint, and further relates to a method for processing these members.

  FIG. 30 is an explanatory diagram showing a general configuration of a steering apparatus for an automobile. The movement of the steering wheel 1 is transmitted to the steering gear 4 via a steering shaft (not shown) rotatably provided in the steering column 2 and the intermediate shaft 3, and the direction of the wheels is steered by the steering gear 4. Normally, the steering shaft and the input shaft of the steering gear 4 cannot be provided on the same straight line.

  For this reason, an intermediate shaft 3 is conventionally provided between the steering shaft and the input shaft 5 to the steering gear 4, and universal joints 6, 6 are connected to both ends of the intermediate shaft 3 and the ends of the steering shaft and the input shaft 5. By being coupled to each other, power transmission can be performed between the steering shaft and the input shaft 5 that do not exist on the same straight line. A buffer member may be incorporated between the steering shaft and the steering gear 4 for the purpose of blocking vibrations from the wheels.

  1 and 2 are explanatory views showing different examples of a universal joint yoke that has been incorporated in a power transmission mechanism. The yoke 10 constituting the joint member includes a joint element 14 and an arm element 21. The joint element 14 is provided with a cylindrical coupling cylinder portion 11 having a slit 13 on the proximal end portion and a serration groove 15 on the inner peripheral surface, and the coupling cylinder portion 11 is formed on the proximal end portion. 13 and a pair of flange portions 16 and 17 provided integrally with the coupling cylinder portion 11.

  A screw hole 18 formed in one flange portion 16 in a direction perpendicular to the flange surface is inserted through a bolt that is screwed into the screw hole 18. A through hole 19 formed concentrically is provided. The arm element 21 is formed in a bifurcated shape on the opposite side of the coupling cylinder portion 11 of the joint element 14, and a pair of circular holes (into which a bearing for fitting with the cross shaft 9 (see FIG. 31) is inserted ( The coupling arm 12 is provided with bearing holes 20, 20.

  1 and 2 is that the phases of the joint element 14 and the arm element 21 are shifted by an appropriate angle, in this case, 90 degrees. The two yokes 10 are coupled via a cross shaft 9 as shown in FIG.

  Further, as shown in FIG. 3, a circular tubular portion 23 having a serration groove 24 on the inner surface is coupled to the joint member at the tip of the coupling tube portion to form the buffer element 22, or FIG. As shown in FIG. 2, there is a case where the solid shaft portion 25 having the serration groove 26 on the outer surface is coupled to form the buffer element 22 (buffer joint).

  FIG. 5 shows a product in which only the joint member itself is made as a single product, and a fitting portion 27 is provided at the base end portion of the coupling cylinder portion 11 when coupled with a mating component (not shown, yoke component, etc.). It has been. Although this part is not used as it is, it can be mechanically coupled to various parts according to the counterpart part, so the range of application is wide.

  These joint members (a universal joint yoke 10 and a joint member having a buffer element 22) are generally made by forging. However, as shown in Patent Document 1 (Japanese Patent Publication No. 07-088859), the yoke 10 is There is also an attempt to make it from a metal plate. Further, as shown in Patent Document 2 (Japanese Patent No. 2534772), there are some which are obtained by punching the joint element 14 into a predetermined blank shape and then performing bending or partial forging, etc. .

  Finally, the joint member is welded to the bifurcated arm element and used as a universal joint yoke. Since it is made of a metal plate, it is necessary to weld a portion continuous to the slit 13 (portion formed by butting with a cylinder) in order to maintain the strength. It will be high. Further, the yoke integrated with the metal plate as in Patent Document 1 has a risk that the flanges 16 and 17 may be deformed and the bolt may be damaged when assembled with the mating shaft.

  In the case of making the yoke shown in FIG. 1 by forging, processing is conventionally performed along the steps shown in FIGS. First, a low-carbon steel blank 28 as shown in FIG. 23 is manufactured. This can be easily formed from a steel billet by a known method such as using a former forging machine.

  The blank 28 has a solid cylindrical portion 282 and notches 283 and 283 having a two-sided width. The blank 28 is annealed and subjected to a surface lubricating film treatment (the same is true in the following examples, so the following examples will be omitted) and forged into a shape as shown in FIG. In this step, a bifurcated arm portion is formed.

  In the next step, the second forging material 30 is obtained as shown in FIG. In this step, the cylindrical portion 282 of the blank 28 is set up and subjected to overmolding in one circumferential direction, and a rectangular solid rectangular overhang portion 281 is formed. In the next step, as shown in FIG. 26, the material tip is completed by punching the tip of the arm in an arc shape.

  In the subsequent cutting process, the material is cut into the slit 13, the serration lower hole and the serration groove 15, the screw hole 18, the through hole 19, the circular hole 20, and the like to obtain the product of FIG.

  The prior art in the case of the product of FIG. 2 is as follows. First, a blank 28 as shown in FIG. 27 is manufactured. This blank is forged into a shape as shown in FIG. 28 and becomes a first forging material 29 having a solid rectangular protruding portion 281, a partial cylindrical portion 282, and a bifurcated arm portion.

  In the next step, as shown in FIG. 29, the tip of the arm is punched into an arc shape, and the forging step of the material is completed. As in the previous example, in the next cutting step, cutting of the slit 13, the serration lower hole and serration groove 15, the screw hole 18, the through hole 19, the circular hole 20 and the like is performed, and the product of FIG. 2 is obtained. It is done. 3 to 5 can be performed by a simpler forging method as compared with the above-described example, and thus description thereof is omitted.

  In any case, in the case of the conventional forging method, the material at the end of the forging process is not formed with any part of the slit and the serration groove hole in the joint part, and these parts are not changed from the beginning in the subsequent process. (In other words, there is no rough hole or rough cutting) and it must be machined by cutting.

At this time, the serration groove hole is drilled with a large drill or a mill, but since this removal volume is large, it takes much time and the efficiency is poor. Further, since the cutting is also performed by grooving with a milling cutter, the removal volume is also large, and therefore the efficiency is not good.
Japanese Patent Publication No. 07-088859 Japanese Patent No. 2534772

  The present invention is an invention made in view of the above-mentioned problems, and by eliminating the need for cutting shaft holes (serration groove holes) and slits as in the prior art from the beginning, the processing time is shortened, Accordingly, it is an object to reduce processing costs and product costs. Another object of the present invention is to manufacture a joint element or yoke having high strength at a low cost so that the metal flow is not cut by cutting as in the prior art.

  The above problem is solved by the following means. That is, the solving means of the first invention comprises: a cut-out portion near the base end; a circular connecting tube portion having a shaft hole for fitting the shaft; and the connecting tube portion sandwiching the cut A pair of flange portions provided integrally, a screw hole formed in one of the flange portions, and a thread formed concentrically for inserting a bolt screwed into the screw hole into the other flange portion. A joint member having a hole, wherein the shaft hole and the slit are simultaneously formed by forging.

  According to a second aspect of the present invention, there is provided a joint member according to the first aspect, wherein the coupling tubular portion extends in the axial direction on the side opposite to the shaft hole and has a serration groove on the inner surface. The shock-absorbing member is integrally formed.

  According to a third aspect of the present invention, there is provided a joint member according to the first aspect, wherein the coupling cylinder portion extends in the axial direction on the opposite side to the shaft hole and has a serration groove on the outer surface. The joint member is characterized in that the buffer member of the shaft is integrally formed.

  According to a fourth aspect of the present invention, there is provided a pair of joint members according to the first aspect, wherein the coupling cylinder portion includes a bearing hole for pivotally supporting the cross member on the side opposite to the shaft hole. The coupling member is characterized in that the coupling arm is integrally formed.

  A solving means of a fifth invention is the joint member according to the fourth invention, wherein the coupling arm and the flange portion are out of phase.

  According to a sixth aspect of the present invention, there is provided a cylindrical coupling cylinder portion having a slit near the proximal end, a shaft hole for fitting the shaft, and the coupling cylinder portion sandwiched between the slits. A pair of flange portions provided; a screw hole formed in one of the flange portions; and a through hole formed concentrically for inserting a bolt screwed into the screw hole into the other of the flange portions. A processing method for processing the above-mentioned shaft hole and slit in a joint member having a circle, and a blank provided with a front rear cylindrical portion having a front rear circular cross section on one end side, and protruding from the circle and this circle The shaft hole and the slit of the joint member are characterized in that the shaft hole and the slit are formed simultaneously by pushing a punch having a keyhole-shaped cross section made of a semi-rectangular portion into the axial direction from the end surface of the front rear cylindrical portion. Processing method for processing A.

  According to a seventh aspect of the present invention, there is provided a processing method for processing a shaft hole and a slit of a joint member according to the sixth aspect of the present invention, wherein the coupling cylinder portion has an axial direction opposite to the shaft hole. A processing method for processing a shaft hole and a slit of a joint member, wherein a circular buffer member extending and having a serration groove on an inner surface is integrally formed.

  According to an eighth aspect of the present invention, there is provided a machining method for machining a shaft hole and a slit of a joint member according to the sixth aspect of the present invention, wherein the coupling cylinder portion is axially opposite to the shaft hole. A solid shaft cushioning member extending integrally and having a serration groove on the outer surface is integrally formed.

  According to a ninth aspect of the present invention, there is provided a processing method for processing a shaft hole and a slit of a joint member according to the sixth aspect of the present invention, wherein the coupling cylinder portion has a cross member on the side opposite to the shaft hole. A processing method for processing a shaft hole and a slit of a joint member, wherein a pair of coupling arms having a bearing hole for pivotally supporting the joint member is integrally formed.

  According to a tenth aspect of the present invention, there is provided a processing method for processing a shaft hole and a slit in a joint member according to the ninth aspect, wherein the coupling arm and the flange portion are out of phase with each other. This is a processing method for processing a shaft hole and a slit of a joint member.

  According to an eleventh aspect of the invention, there is provided a machining method for machining a shaft hole and a slit of a joint member according to the sixth to tenth aspects of the invention, wherein the punch having the keyhole-shaped cross section is formed on a side surface of the cylindrical portion. A machining method for machining a shaft hole and a slit of a joint member, characterized in that it has a shape for forming a serration, and the serration is formed inside the shaft hole.

  As described above, according to the present invention, the forging of the joint element and the serration pilot hole can be formed by forging at the time of forging. Time can be shortened and cutting cost is reduced. As a result, the product cost is reduced.

  Moreover, since the partial shape of the joint element is formed by forging, the material is forged and the strength is increased, and the metal flow is not cut, so that the durability strength of the product is improved, and a high-quality joint member can be obtained at low cost.

  The first blank of the present invention is substantially the same as the blank in the prior art, and this blank is provided with a front rear cylindrical portion having a front rear circular cross section on one end side. When the base end portion of the blank is cut, a shaft hole for fitting the shaft is formed into a circular tube by forging to form a coupling tube portion.

  At this time, a pair of flange portions are formed in the coupling cylinder portion so as to sandwich the slit, and then a screw hole is formed in one of the flange portions, and a bolt to be screwed into the screw hole is inserted in the other. Are formed concentrically, and the most basic joint member is obtained.

  Further, the coupling cylinder portion has a cylindrical buffer member extending in the axial direction on the opposite side of the shaft hole and having a serration groove on the inner surface, or a solid shaft buffer member having a serration groove on the outer surface. May be integrally formed, and a pair of coupling arms having bearing holes for supporting the cross member may be integrally formed. In the case of the last example, the phases of the coupling arm and the flange portion may be shifted or the same phase depending on the location to be used.

  The slit and the shaft hole are formed simultaneously by pushing a punch having a keyhole-shaped cross-section consisting of a circle and a semi-rectangular portion protruding from the circle from the end face of the front rear cylindrical portion in the axial direction. .

  According to the present invention, it is not necessary to cut shaft holes (serration groove holes), serrations and slits from the beginning as in the prior art, and the processing time can be shortened, thereby reducing processing costs and product costs. Is possible. Further, since the metal flow is not cut by cutting as in the prior art, a high strength joint member or yoke can be manufactured at low cost.

  Hereinafter, a joint part and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings. In the first embodiment of the present invention, the product shown in FIG. 1 is manufactured by the steps shown in FIGS. As shown in FIG. 6, the initially prepared blank 28 has a cylindrical portion 282 in the middle, a partial cylindrical portion 285 having a rectangular overhanging portion 281 on one side, and a two-sided cutout on the other side. Parts 283 and 283.

  The blank 28 can be manufactured by using a forging device such as a former as in the conventional case, and is also the same as in the conventional case in that annealing and surface lubricating film treatment are performed. Since the description of this part is the same, the description of this part is omitted in the following embodiments.

  6 is forged to produce a first forging material 29 shown in FIG. The first forging material 29 is formed by forming the rectangular projecting portion 281 and the partial cylindrical portion 285 of FIG. 6 by backward extrusion forging and forming the opening hole portion 291.

  More specifically, this molding is performed by pushing a keyhole-shaped punch having a complementary shape into the opening hole 291 from the end of the material, and backward-extrusion and forging the rectangular projecting portion 281 and the partial cylindrical portion 285. Since this is the same in the second to fifth embodiments described later, the description of this portion is omitted in the description of these embodiments.

  The opening hole 291 has a keyhole shape, has a slit 294 that is also open on the side surface, and includes a bottom 292 and a burr 293 at the bottom of the opening hole 291. On the opposite side, a cylindrical portion 282 having a notch 283 (FIG. 6) is formed into a bifurcated shape, thereby forming an arm portion. The bottom part of the arm part and the bottom part 292 of the opening hole part 291 are close to each other and have a thickness that allows punching.

  The forged product in FIG. 7 has a shape in which the bottom 292 and the burr 293 are punched in the next step, and has a hole penetrating in the axial direction, as shown in FIG. In the next step, the tip of the arm is punched into an arc shape to form the shape shown in FIG. 9, and the material manufacturing process is completed. In the next cutting process, this material is cut out of the serration groove 15, screw hole 18, through hole 19, and circular holes 20, 20 into the product of FIG. 1.

  Compared to the conventional material shown in FIG. 26, the slit 294 and the opening hole 291 are greatly different in the case of the present invention in that they are completed at the end of forging. For this reason, in the case of the present invention, it is not necessary to cut the slit 294 and the serration pilot hole (opening hole), or it has a great feature that even if it is finished, only a small amount of thinning is required, thereby reducing the cost. Can contribute.

  In this process, the slits 294 (13) and the connecting arm 12 of the yoke 10 are 90 degrees out of phase with each other, but in the steps shown in FIGS. Since it is only necessary to shift the angle, it can be easily changed.

  By forming grooves corresponding to serrations on the cylindrical side surface of the keyhole-shaped punch, serration grooves can be formed at the time of forming the opening hole portion 291, so that it is not necessary to cut them in a subsequent process. The same applies to the following embodiments.

  The second embodiment is an example of manufacturing a product in which the phases of the slit 294 (13) and the coupling arm 12 of the yoke 10 are matched (FIG. 2). The steps are shown in FIGS. As shown in FIG. 10, the first blank 28 has a rectangular protruding portion 281 and a partial cylindrical portion 285 on one side and a rectangular portion 284 on the other side. This blank 28 is forged to produce a first forging material 29 shown in FIG.

  In this first forging material 29, the rectangular overhanging portion 281 and the partial cylindrical portion 285 are formed by backward extrusion forging, and the opening hole portion 291 is formed. The opening hole portion 291 is formed by the same method as in the first embodiment, has a keyhole shape, and this opening portion also opens on the side surface to form a slit 294.

  A bottom portion 292 exists at the bottom portion of the opening hole, and on the other side, the rectangular portion 284 of FIG. 10 is formed in a bifurcated manner to form an arm portion. The bottom part of the arm part and the bottom part 292 of the opening hole part 291 are close to each other and are formed to a thickness that allows punching.

  In the next step, the forged product shown in FIG. 11 is punched at the bottom 292 to have the shape shown in FIG. In the next step, the tip of the arm is punched into an arc shape so as to have the shape shown in FIG. In the next cutting process, this material is cut out of the serration groove 15, the screw hole 18, the through hole 19, and the circular holes 20 and 20 into the product of FIG.

  Compared to the conventional material shown in FIG. 29, in the case of the present invention, the slit 294 and the opening hole 291 are different in that they are completed at the material stage. Therefore, in the case of the present invention, it is not necessary to cut the slit 294 and the serration pilot hole (opening hole), or even if it is finished, only a small thickness is required, and the manufacturing cost can be reduced.

  Example 3 is an example in which the product shown in FIG. 3 is manufactured, and the process is shown in FIGS. The first blank 28 has a rectangular protruding portion 281 and a partial cylindrical portion 285 on one side and a cylindrical portion 282 on the other side. 14 is forged to produce a first forging material 29 shown in FIG. The forged material 29 is formed by forming the rectangular projecting portion 281 and the partial cylindrical portion 285 of FIG. 14 by backward extrusion forging and forming the opening hole portion 291.

  The opening hole 291 has a keyhole shape, and the opening has a slit 294 that also opens on the side surface. A bottom 292 and a burr 293 are present at the bottom of the opening hole. On the other hand, the cylindrical portion 282 of FIG. 14 is formed in a tube shape on the opposite side to form a circular tubular portion 23, and a serration groove 24 is formed on the inner surface thereof. The bottom portion of the circular tubular portion 23 and the bottom portion 292 of the opening hole portion 291 are close to each other and are formed to have a thickness that allows punching.

  In this example, the inner surface serration groove 24 is formed at the time of forging in FIG. 15, but the inner surface serration groove 24 may be formed in a separate step by dividing the process.

  In the next step, the forged product of FIG. 15 is punched through the bottom 292 and the burr 293 to have the shape shown in FIG. 16, and the forging process of the material is completed. In the next cutting process, this material is cut out the serration groove 15, the screw hole 18, and the through hole 19 to obtain the product shown in FIG.

  Compared to a conventional material, the slit 294 and the opening hole 291 are different in the case of the present invention in that they are completed at the material stage. Therefore, in the case of the present invention, it is not necessary to cut the slit 294 and the serration pilot hole (opening hole), so that the cost can be reduced.

  Conventionally, in the case of this product, a method in which the joint element 14 and the buffer element 22 are separately manufactured and joined together by welding has been employed. However, in the case of the present invention, since it can be manufactured integrally, Man-hours can be saved.

  Example 4 is an example in which the product shown in FIG. 4 is manufactured, and the steps are shown in FIGS. The first blank 28 has a rectangular protruding portion 281 and a partial cylindrical portion 285 on one side and a cylindrical portion 282 on the other side. 17 is forged to produce a first forging material 29 shown in FIG.

  In this forged material 29, the rectangular projecting portion 281 and the partial cylindrical portion 285 in FIG. 17 are formed by backward extrusion forging, and the opening hole portion 291 is formed. The opening hole portion 291 has a keyhole shape, and the opening portion has a slit 294 that also opens on the side surface. A bottom 292 and a burr 293 are present at the bottom of the opening hole.

  Serration grooves 15 are already formed on the circumferential surface of the opening hole 291. On the other hand, on the opposite side, the cylindrical portion 282 of FIG. 17 is axially extruded forward to form a solid shaft portion 25, and a serration groove 26 is formed on the outer peripheral surface thereof.

  In this example, the serration groove 15 and the outer surface serration groove 26 are formed at the time of forging in FIG. 18, but the process is divided into separate steps (inner surface) and the outer surface serration groove 15. 26 may be formed.

  In the next step, the forged product of FIG. 18 is punched out of the burr 293 to have the shape shown in FIG. 19, and the raw material process is completed. In the next cutting process, this material is cut out of the screw hole 18 and the through hole 19 to obtain the product shown in FIG. Compared to a conventional forging material, the slit 294, the opening hole 291 and the serration groove 15 are different in the present invention in that they are completed at the material stage.

  Therefore, in the case of the present invention, since it is not necessary to cut the slit 294 and the serration groove 15, the manufacturing cost can be reduced. Conventionally, in the case of this product, a method in which the joint element 14 and the buffer element 22 are separately manufactured and joined together by welding has been employed. However, in the case of the present invention, since it can be manufactured integrally, Man-hours can be saved.

  Example 5 is an example in which the product shown in FIG. 5 is manufactured, and the steps are shown in FIGS. As shown in FIG. 20, the first blank 28 has a rectangular protruding portion 281 and a partial cylindrical portion 285 on one side and a cylindrical portion 282 on the other side. The blank of FIG. 20 is forged to produce a first forging material 29 shown in FIG.

  In this forged material 29, the rectangular protruding portion 281 and the partial cylindrical portion 285 in FIG. 20 are formed by backward extrusion forging, and the opening hole portion 291 is formed. The opening hole 291 has a keyhole shape, and the opening has a slit 294 that also opens on the side surface. A bottom 292 and a burr 293 are present at the bottom of the opening hole. On the other hand, the other side is lightly molded so that the cylindrical portion 282 of FIG. 20 has a step. This level difference becomes the fitting part 27 when coupled with the mating part.

  In the next step, the bottom portion 292 and the burr portion 293 are punched out into the forged product shown in FIG. 21 to have a shape as shown in FIG. In the next cutting process, the material is cut out of the serration groove 15, the screw hole 18, and the through hole 19 to obtain the product shown in FIG.

  Compared with a conventional forging material, the cutting 294 and the opening hole 291 are different in that they are completed at the forging stage of the material in the present invention. Therefore, in the case of the present invention, it is not necessary to cut the slit 294 and the serration pilot hole (opening hole).

It is explanatory drawing which shows the example of the yoke of the universal joint conventionally integrated in the power transmission mechanism, (a) is a left view, (b) is a longitudinal cross-sectional view, (c) is a right view of (b) FIG. 4D is a bottom view (partial cross section) of FIG. It is explanatory drawing which shows the other example of the yoke of the universal joint conventionally integrated in the power transmission mechanism, (a) is a left view, (b) is a longitudinal cross-sectional view, (c) is (b). The right side view, (d) is a bottom view (partial cross section) of (b). It is a figure which shows an example of the buffer joint which has the circular tubular member used as the object of 3rd Example of this invention, Comprising: (a) is a left view of (b), (b) is a longitudinal cross-sectional view, (c) ) Is a right side view of (b), and (d) is a bottom view of (b). It is a figure which shows an example of the buffer joint which has a solid shaft member used as the object of the 4th Example of this invention, Comprising: (a) is a left view of (b), (b) is a longitudinal cross-sectional view, ( c) is a right side view of (b), and (d) is a bottom view of (b). It is a figure which shows an example of the coupling components used as the object of 5th Example of this invention, Comprising: (a) is a left view of (b), (b) is a longitudinal cross-sectional view, (c) is (b). (D) is a bottom view of (b). It is 1st Example (FIGS. 6-9) of this invention, Comprising: It is a figure explaining the manufacturing process of the raw material of the universal joint yoke of FIG. 1, (a) is a front view of a blank, (b) is It is a right view of (a). FIG. 6 shows a shape obtained by forging the blank of FIG. 6, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 7 represents a step of punching out the bottom portion and the burr portion of the forged product of FIG. 7, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), d) is a bottom view (partial cross section) of (b). 8 shows a step of cutting the arm tip of the workpiece of FIG. 8 into an arc shape, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (D) is a bottom view (partial cross section) of (b). FIG. 10 is a view for explaining a manufacturing process of the material of the universal joint yoke of FIG. 2 according to the second embodiment of the present invention (FIGS. 10 to 13), (a) is a left side view of the blank, and (b). Is a front view, and (c) is a right side view of (b). 10 represents a shape obtained by forging the blank of FIG. 10, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 11 represents a step of punching the bottom of the forged product of FIG. 11, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is a left side view. It is a lower surface (partial cross section) figure of (b). 12 shows a step of cutting the arm tip of the workpiece of FIG. 12 in an arc shape, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (D) is a bottom view (partial cross section) of (b). It is a figure explaining the manufacturing process of the raw material of the coupling member which has 3rd Example (FIGS. 14-16) of this invention, and has a hollow cylinder of FIG. 3, (a) is a left view of a blank. (B) is a front view. 14 shows the shape of the blank of FIG. 14 formed by forging, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 15 represents a step of punching the burr portion of the forged product of FIG. 15, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (d) FIG. 6 is a bottom view of (b). It is a 4th Example (FIGS. 17-19) of this invention, Comprising: It is a figure explaining the manufacturing process of the raw material of the coupling member which has the solid axis | shaft of FIG. 4, (a) is a front view of a blank, (B) is a right side view of (a). FIG. 17 shows a shape obtained by forging the blank of FIG. 17, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. FIG. 18 shows a process of punching out the burr portion of the forged product of FIG. 18, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (d) FIG. 6 is a bottom view of (b). FIG. 20 is a fifth embodiment of the present invention (FIGS. 20 to 22), and is a diagram for explaining the manufacturing process of the material of the joint member of FIG. 5, wherein (a) is a left side view of the blank, and (b) It is a front view. FIG. 20 shows a shape obtained by forging the blank of FIG. 20, wherein (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 21 represents a step of punching the bottom and burr of the forged product of FIG. 21, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), d) is a bottom view of (b). The manufacturing process (FIGS. 23-26) of the yoke of FIG. 1 in a prior art is shown, (a) is a front view of a blank, (b) is a right view of (a). FIG. 23 shows a shape obtained by forging the blank of FIG. 23, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 24 shows the shape of the shaft of the forged product shown in FIG. 24, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (d ) Is a bottom view (partial cross section) of (b). 25 shows a step of cutting the arm tip of the workpiece of FIG. 25 into an arc shape, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (D) is a bottom view (partial cross section) of (b). 2 shows the manufacturing process (FIGS. 27 to 29) of the yoke of FIG. 2 in the prior art, where (a) is a left side view of the blank, (b) is a front view, and (c) is a right side view of (b). It is. 27 represents a shape obtained by forging the blank of FIG. 27, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), and (d) is (b) FIG. 28 represents a step of cutting the arm tip in an arc shape, (a) is a left side view of (b), (b) is a longitudinal sectional view, (c) is a right side view of (b), (d ) Is a bottom view of (b). It is explanatory drawing which shows the general structure of the steering device of a motor vehicle. It is explanatory drawing for demonstrating the outline | summary of a universal joint part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering column 3 Intermediate shaft 4 Steering gear 5 Input shaft 6 Universal joint 9 Cross shaft 10 Yoke 11 Joint cylinder part 12 Joint arm 13 Cutting 14 Joint element 15 Serration groove 16, 17 Flange part 18 Screw hole 19 Through hole 20 Circular hole 21 Arm element 22 Buffer element 23 Circular tubular part 24 Serration groove 25 Solid shaft part 26 Serration groove 27 Fitting part 28 Blank 29, 30 Forging material 281 Rectangular projecting part 282 Cylindrical part 283 Notch part 284 Rectangular part 285 part Cylindrical part 291 Opening hole part 292 Bottom part 293 Burr part 294

Claims (11)

A cylindrical coupling tube portion provided with a shaft hole for fitting a shaft into a portion near the proximal end, and a shaft;
A pair of flange portions provided integrally with the coupling cylinder portion across the slit;
A screw hole formed in one of the flange portions;
In the joint member having, on the other side of the flange portion, a through hole formed concentrically for inserting a bolt to be screwed into the screw hole,
The joint member, wherein the shaft hole and the slit are simultaneously formed by forging. In the joint member according to claim 1,
A joint member, wherein a circular shock-absorbing member extending in the axial direction on the opposite side of the shaft hole and having a serration groove on the inner surface is integrally formed on the coupling cylinder portion. In the joint member according to claim 1,
A joint member, wherein a solid shaft buffer member extending in the axial direction on the opposite side of the shaft hole and having a serration groove on the outer surface is integrally formed in the coupling cylinder portion. In the joint member according to claim 1,
A joint member characterized in that a pair of coupling arms having bearing holes for pivotally supporting the cross member are integrally formed on the coupling cylinder portion on the side opposite to the shaft hole. In the joint member according to claim 1,
The coupling member, wherein the coupling arm and the flange portion are out of phase. A cylindrical coupling tube portion provided with a shaft hole for fitting a shaft into a portion near the proximal end, and a shaft;
A pair of flange portions provided integrally with the coupling cylinder portion across the slit;
A screw hole formed in one of the flange portions;
A processing method for processing the shaft hole and the slit in a joint member having a through hole formed concentrically for inserting a bolt to be screwed into the screw hole on the other of the flange portions,
A punch having a keyhole-shaped cross section consisting of a circle and a semi-rectangular portion protruding from the circle is applied to a blank having a front rear cylindrical section having a front rear circular section on one end side. A processing method for processing a shaft hole and a slit of a joint member, wherein the shaft hole and the slit are formed simultaneously by pushing in an axial direction from an end face. In the processing method for processing the shaft hole and the slit in the joint member according to claim 6,
A shaft hole of a joint member, wherein the coupling tube portion is integrally formed with a cylindrical buffer member extending in the axial direction on the opposite side of the shaft hole and having a serration groove on the inner surface; Machining method for machining cuts. In the processing method for processing the shaft hole and the slit in the joint member according to claim 6,
A shaft hole of a joint member, wherein the coupling cylinder portion is integrally formed with a solid shaft buffer member extending in the axial direction on the opposite side of the shaft hole and having a serration groove on the outer surface. And processing method for cutting and cutting. In the processing method for processing the shaft hole and the slit in the joint member according to claim 6,
A pair of coupling arms having bearing holes for pivotally supporting the cross member are integrally formed on the coupling cylinder portion on the side opposite to the shaft hole. Processing method for processing. In the processing method for processing the shaft hole and the slit in the joint member according to claim 9,
A processing method for processing a shaft hole and a slit of a joint member, wherein the coupling arm and the flange portion are out of phase with each other. In the processing method for processing the shaft hole and the slit in the joint member according to any one of claims 6 to 10,
The punch having the keyhole-shaped cross section has a shape for forming serrations on the side surface of the cylindrical portion, and serrations are formed inside the shaft holes. Processing method for processing.

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