JP3722795B2 - Vehicle drive plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk-like drive plate interposed between an engine and a fluid transmission device.
[0002]
[Prior art]
In a vehicle, it is interposed between an engine and a fluid transmission connected to the engine to transmit power output from the engine, and is connected to the crankshaft of the engine and the fluid transmission. A disk-shaped drive plate is known. This drive plate is usually provided with outer peripheral teeth for meshing with a starter motor pinion, and is rotated integrally with the crankshaft by the starter motor when the engine is started. The drive plate is connected to the crankshaft and the fluid transmission device to transmit the power output from the engine to a fluid transmission device such as a torque converter or a fluid coupling. The center of the shaft of the crankshaft and the center of the fluid transmission device are centered. For example, as described in Patent Document 1, a cylindrical bearing portion is coaxially formed (projected) at the center portion of the drive plate by a pressing process using a press, and the inner peripheral surface of the bearing portion is formed. The end of the crankshaft and the pilot boss protruding from the fluid transmission device are fitted to the cylindrical bearing so that the crankshaft and the fluid transmission To improve the assembly accuracy. In addition, a cylindrical bearing member welded to the center hole of the drive plate has been proposed in place of the cylindrical bearing portion obtained by the above-described squeezing process.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-314463
[Problems to be solved by the invention]
By the way, in the conventional drive plate as described above, the pressing process for squeezing the bearing portion becomes very large, and the error generated in each process is accumulated, so that the dimensional accuracy is deteriorated and the quality may be deteriorated. There is a problem that the cost of the mold and the manufacturing cost increase. In addition, since the bearing portion is integrally formed, when changing the product specifications, it is necessary to change the drive plate completely, and it is difficult to apply it to high-mix low-volume production. Furthermore, when welding a bearing member, the manufacturing cost increases to correct the welding distortion and spatter adhesion that occur on the bearing member, and the quality of the bearing due to poor welding and poor mounting strength due to poor welding. There was a risk of lowering.
[0005]
The present invention has been made in the background of the above circumstances, and the object of the present invention is to further improve the centering accuracy when assembling the shaft center of the engine crankshaft and the shaft center of the fluid transmission device. An object of the present invention is to provide a vehicle drive plate that can be improved and the manufacturing cost can be reduced.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the gist of the present invention is that a disk-like structure is interposed between an engine and a fluid transmission device and is connected to the crankshaft of the engine and the fluid transmission device. a drive plate for vehicles, Rutotomoni center hole formed through the center of rotation, which is notch formed on the inner peripheral corner portion between the one surface and the inner circumferential surface of the center hole A disc, a cylindrical large-diameter portion having an outer diameter larger than the central hole, and a cylindrical small-diameter portion having an outer diameter that can be fitted in the central hole are integrally provided. The crankshaft and the fluid transmission device are positioned by the outer peripheral surface and the inner peripheral surface, and the end portion of the small diameter portion is plastically deformed by caulking, and the outer peripheral surface is plasticized by caulking of the end portion. The part to be deformed is received in the notch And a bearing member fixed to the disc by being crimped to the center hole Te, in that it comprises.
[0007]
【The invention's effect】
In this way, the bearing member can be easily positioned with respect to the disk by providing a radial step in the longitudinal direction of the outer peripheral surface of the bearing member at the boundary between the large diameter portion and the small diameter portion. The end portion of the small diameter portion is only plastically deformed by caulking, and the inner peripheral edge portion of the center hole is sandwiched between the caulking portion and the large diameter portion, thereby being fixed to the disk. Therefore, there is no possibility of deformation of the drive plate, deterioration of dimensional accuracy, etc., so that a high-precision drive plate is manufactured, and the crankshaft and the fluid transmission device are positioned by the large-diameter portion not involved in caulking. Thus, the centering accuracy when assembling the shaft center of the engine crankshaft and the shaft center of the fluid transmission device is further improved. In addition, the manufacturing process is simple, and correction of defects that occur in the manufacturing process is unnecessary, so that the manufacturing cost is reduced. In addition, a part of the end portion of the small diameter portion that is plastically deformed to the outer peripheral side by caulking is received in the notch formed in the disk, so that when the small diameter portion is caulked with the disk, The part is inserted into the notch, so that the bearing member is more firmly fixed to the disc in the removal direction and particularly in the rotation direction. Cracks (cracks) occurring at the inner peripheral edge of the steel are prevented.
[0008]
[Second means for solving the problem]
In order to achieve the above object, the gist of the present invention is a disk-like structure interposed between an engine and a fluid transmission device and connected to the crankshaft of the engine and the fluid transmission device. Drive plate for a vehicle, wherein a central hole is formed through the center of rotation, and an inner periphery of the center hole is communicated with an inner peripheral edge of one surface and an inner peripheral edge of the other surface. A disk having grooves formed in the axial direction of the surface, a cylindrical large diameter portion having an outer diameter larger than the center hole, and a cylindrical small diameter portion having an outer diameter that can be fitted in the center hole The crankshaft and the hydrodynamic transmission device are positioned by the outer peripheral surface and the inner peripheral surface of the large-diameter portion, and the end of the small-diameter portion is plastically deformed by caulking and the end The plastic deformation to the outer peripheral side by caulking of the part And a bearing member which part that is fixed to the disc by being crimped to the center hole is received in the groove, in that it comprises.
[0009]
[Effect of the second invention]
In this way, the bearing member can be easily positioned with respect to the disk by providing a radial step in the longitudinal direction of the outer peripheral surface of the bearing member at the boundary between the large diameter portion and the small diameter portion. The end portion of the small diameter portion is only plastically deformed by caulking, and the inner peripheral edge portion of the center hole is sandwiched between the caulking portion and the large diameter portion, thereby being fixed to the disk. Therefore, there is no possibility of deformation of the drive plate, deterioration of dimensional accuracy, etc., so that a high-precision drive plate is manufactured, and the crankshaft and the fluid transmission device are positioned by the large-diameter portion not involved in caulking. Thus, the centering accuracy when assembling the shaft center of the engine crankshaft and the shaft center of the fluid transmission device is further improved. In addition, the manufacturing process is simple, and correction of defects that occur in the manufacturing process is unnecessary, so that the manufacturing cost is reduced. In addition, a part of the end portion of the small diameter portion that is plastically deformed to the outer peripheral side by caulking is received in the groove portion formed in the disk, so that when the small diameter portion is caulked with the disk, a part of the small diameter portion Is inserted into the groove, so that the bearing member is more firmly fixed to the disc in the removal direction and in particular in the rotation direction. Cracks (cracks) occurring at the periphery are prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 is a diagram for explaining a main part of a motor and a drive system of a vehicle to which a drive plate 12 according to an embodiment of the present invention is applied. FIG. 6 shows a torque converter 14 to which the drive plate 12 is assembled. FIG. 1 and 6, the output of the engine 10 as a power source is input to the automatic transmission 16 via a drive plate 12 and a torque converter 14 as a fluid transmission, and is transmitted from an axle 70 to drive wheels (not shown). It has come to be.
[0013]
The drive plate 12 is interposed between the engine 10 and the torque converter 14, and connects the crankshaft 18 of the engine 10 and the torque converter 14 so that the power output from the engine 10 is transmitted to the torque converter 14. introduce.
[0014]
FIG. 2A is a front view of the drive plate 12, and FIG. 2B is a cross-sectional view taken along line AA shown in FIG. In FIG. 2, the drive plate 12 includes a metal disc 20 made of steel, for example, and a cylindrical bearing member 22 made of relatively soft steel having a carbon content lower than that of the metal eg disc 20. The dynamic balance weight 34 is provided by, for example, spot welding in order to improve the dynamic balance. The disk 20 is made of, for example, S35C mechanical structural carbon steel, and the bearing member 22 is made of, for example, S15C mechanical structural carbon steel.
[0015]
The disc 20 is formed into a substantially circular shape, for example, by being punched from a plate material by press working, and a central hole 36 is formed through the center of rotation. The bearing member 22 having a cylindrical shape that can be fitted into the center hole 36 is fixed by being caulked to the center hole 36 by plastically deforming one end thereof to the outer peripheral side by caulking. ing.
[0016]
In addition to the center hole 36, the disc 20 has a torque converter connecting hole 24 and a center hole located at equal intervals along the concentric circumferential direction near the outer periphery by, for example, pressing using a punching punch. A plurality of, for example, six crankshaft connecting holes 26 are formed at equal intervals along the concentric circumferential direction on the inner peripheral side closer to 36. Further, in order to reduce the weight and improve the dynamic balance between the torque converter connecting hole 24 and the crankshaft connecting hole 26, the diameter from the center of the disk 20 is long at equal intervals along the circumferential direction. A plurality of, for example, three 1 sub-holes 28 and a plurality of, for example, six second sub-holes 30 having a short diameter from the center are formed.
[0017]
Further, the disk 20 is formed with a ring gear 32 on the outer peripheral surface by, for example, cold forging, and the surface of the disk 20 is formed so that the vicinity of the rotation center is a substantially circular convex portion on the engine 10 side. Has been. The ring gear 32 is engaged with a pinion of a starter motor (not shown), so that when the engine 10 is started, the drive plate 12 is rotated together with the crankshaft 18 by the starter motor.
[0018]
Next, the formation method and shape of the center hole 36 will be described. FIG. 3A is a partial enlarged view of the front surface of the center of rotation of the disk 20, and FIG. 3B is a partial view of the AA cross section shown in FIG. In the figure, a plurality of, for example, six notches 38 are formed at the inner peripheral corner between the inner peripheral surface of the center hole 36 and one surface of the disk 20. The center hole 36 and the notch 38 are formed by punching using the punching punch 40 shown in FIG. When the inner peripheral edge of the center hole 36 is pressed by the notch protrusions 44 formed in the notch 44, a notch 38 having substantially the same shape as the notch protrusions 44 is simultaneously formed. This notch projection 44 is formed in substantially the same shape as one of the spheres divided into four substantially the same shape. The notch 38 is for allowing a part of the bearing member 22 that has undergone plastic deformation to sufficiently enter when the bearing member 22 is caulked.
[0019]
FIG. 5 is a partially enlarged view of a cross section of the rotation center portion of the drive plate 12, (a) is a view before the bearing member 22 is caulked, and (b) is a caulking of the bearing member 22. FIG. The bearing member 22 has a substantially cylindrical shape, has a small diameter portion 46 that is substantially the same diameter as the center hole 36 and can be fitted into the center hole 36, and has a slightly larger outer diameter than the small diameter portion 46. A cylindrical hole is formed integrally with a fitting hole formed in the end face of the crankshaft 18 and a large-diameter portion 48 that is substantially the same diameter and that can be fitted to the crankshaft 18 so that the respective axes are aligned. Yes. As a result, a radial step is provided in the longitudinal direction of the outer peripheral surface of the bearing member 22 at the boundary between the large diameter portion 48 and the small diameter portion 46. Further, the bearing member 22 is formed with a torque converter fitting hole 50 which is a through hole having the substantially same inner diameter as the torque converter protruding portion 56 and into which the torque converter protruding portion 56 can be fitted. The torque converter fitting hole 50 has a diameter on the torque converter 14 side larger than the diameter on the engine 10 side, and gradually becomes smaller as it approaches the engine 10 side. The diameter is almost the same. In other words, the thickness of the small diameter portion 46 becomes thinner toward the end of the small diameter portion 46 opposite to the large diameter portion 48. This is intended to improve the assembling property, reduce the load during caulking, and prevent the inner diameter of the small-diameter portion 46 after caulking from becoming smaller than the inner diameter of the large-diameter portion 48.
[0020]
As shown in FIG. 5A, the bearing member 22 is positioned by an annular support jig 62 fixed to a caulking device work table 64, and the small diameter portion 46 is inserted into the central hole 36 and the large diameter portion 48. The disc 20 is placed on the bearing member 22 and the support jig 62 so as to be fitted up to the position of the step. In this state, the tip end portion of the caulking punch 60 of the caulking device (not shown) provided rotatably around the axis inclined with respect to the axis C of the center hole 36 is projected to the portion protruding from the center hole 36 of the small diameter portion 46. By applying the load to the small diameter portion 46 while rotating the caulking punch 60 around the axis C of the center hole 36, the upper end portion of the small diameter portion 46 is subjected to plastic deformation and is expanded in the outer circumferential direction. Then, the bearing member 22 is caulked in the center hole 36 and fixed to the disk 20, and the state shown in FIG. At this time, a part of the bearing member 22 that has been plastically deformed by the caulking is caulked so as to closely enter the notch 38. The shape of the notch 38 is determined as a result of various studies so as to be completely filled with the bearing member 22. The caulking load may be determined within a range of force that does not cause the disk 20 to be deformed because the material of the bearing member 22 is softer than the material of the disk 20.
[0021]
FIG. 6 is a partial cross-sectional view when the drive plate 12 configured as described above is assembled to an actual vehicle. The drive plate 12 is assembled with the torque converter 14 in a state where the drive plate 12 is assembled with the crankshaft 18 of the engine 10 and integrated with the crankshaft 18. The crankshaft 18 and the drive plate 12 are fitted with the large diameter portion 48 in a fitting hole 66 formed in the end face of the crankshaft 18 so that the shaft centers of the drive plate 12 and the crankshaft 18 are aligned. The drive plate 12 is integrally connected to the crankshaft 18 through a washer 52 and the crankshaft connecting hole 26 from the drive plate 12 side. Next, the drive plate 12 and the torque converter 14 integrated with the crankshaft 18 of the engine 10 are inserted into the torque converter fitting hole 50 so that the torque converter projection 56 is fitted into the drive plate 12 and the torque converter. In a state where the shaft centers of 14 are aligned, they are connected from the drive plate 12 side by connecting bolts 24a screwed into the torque converter 14 through the torque converter connecting holes 24.
[0022]
As described above, according to the present embodiment, the drive plate 12 is composed of the disc 20 and the bearing member 22, and the disc 20 is formed with the center hole 36 penetrating in the center of rotation, and the center thereof. Since the bearing member 22 having a cylindrical shape that can be fitted into the hole 36 is fixed to the disk 20 by being crimped to the center hole 36, the drive plate 12 is deformed, the dimensional accuracy is deteriorated, and the like. The higher precision drive plate 12 is manufactured, and the centering accuracy at the time of assembling the axis of the crankshaft 18 of the engine 10 and the axis of the torque converter 14 is further improved. In addition, the manufacturing process is simple, and correction of defects that occur in the manufacturing process is unnecessary, so that the manufacturing cost is reduced.
[0023]
Further, according to the present embodiment, the bearing member 22 has a large diameter portion 48 having an outer diameter larger than that of the center hole 36 and a small diameter portion 46 having an outer diameter that can be fitted in the center hole 36. The end portion of the small diameter portion 46 is fixed to the disk 20 by being plastically deformed by caulking. Therefore, the bearing member 22 has a boundary portion between the large diameter portion 48 and the small diameter portion 46. A radial step is provided in the longitudinal direction of the outer peripheral surface of the bearing member 22, and the positioning between the bearing member 22 and the disk 20 can be easily performed by the step, and an end portion of the small diameter portion 46 is formed. The inner peripheral edge of the center hole 36 is sandwiched between the caulking portion and the large diameter portion 48 only by being plastically deformed by caulking, and is fixed to the disk 20. As a result, there is no possibility that the drive plate 12 is deformed, the dimensional accuracy is deteriorated, etc., and the drive plate 12 with higher accuracy is manufactured, and the center of the axis of the crankshaft 18 of the engine 10 and the axis of the torque converter 14 is formed. The dispensing accuracy is further improved. In addition, the manufacturing process is simple, and correction of defects that occur in the manufacturing process is unnecessary, so that the manufacturing cost is reduced.
[0024]
Further, according to this embodiment, the disc 20 is fitted with the bearing member 22, protrudes through the center hole 36, and receives a part of one end portion of the bearing member 22 that is plastically deformed to the outer peripheral side by caulking. Therefore, when the bearing member 22 is caulked with the disk 20 because the notch 38 formed at the inner peripheral corner between the one surface of the disk 20 and the inner peripheral surface of the center hole 36 is provided. A part of the bearing member 22, that is, the end of the small diameter portion 46 is subjected to plastic deformation and is inserted into the notch 38 without a gap, so that the bearing member 22 is more firmly secured in the removal direction and particularly in the rotation direction. The sound generated due to the looseness caused by the minute vibration generated in the vehicle and the crack (crack) generated at the inner peripheral edge of the center hole 36 are suitably prevented. Moreover, since the notches 38 are formed at equal intervals in the circumferential direction, the dynamic balance of the drive plate 12 is preferably improved. Further, the notch 38 is formed at the same time as the processing step of the center hole 36 and the manufacturing process does not increase, so that the manufacturing cost does not increase.
[0025]
Next, another embodiment of the present invention will be described. In the following description, parts common to those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.
[0026]
FIG. 7 is a partially enlarged view of the center of rotation of the disk 20 in another embodiment of the present invention, and corresponds to FIG. 3 in the above-described embodiment. FIG. 7A is a partially enlarged view of the front surface of the center of rotation of the disc 20, and FIG. 7B is a partially enlarged view of the AA cross section shown in FIG. 7A. In the figure, a groove portion 54 is formed in the thickness direction of the inner peripheral surface of the center hole 36 so that the inner peripheral edge portion of one surface of the disk 20 communicates with the inner peripheral edge portion of the other surface. The center hole 36 and the groove 54 are formed by punching using a punching punch (not shown) corresponding to the punching punch 40 shown in FIG. The center hole 36 and the groove 54 are simultaneously formed by the mold protrusion. A plurality of, for example, six grooves 54 are formed along the circumferential direction. The groove-shaped die projection is formed in substantially the same shape as one of the cylindrical parts divided into two along the axis. The groove portion 54 is for allowing a part of the bearing member 22 that has undergone plastic deformation to enter when the bearing member 22 is caulked. In this way, when the bearing member 22 is caulked with the disk 20, a part of the bearing member 22 is inserted into the groove portion 54, so that the bearing member 22 is more firmly attached to the disk 20 especially in the rotation direction. The sound generated due to the looseness caused by the minute vibration generated in the vehicle and the crack (crack) generated at the inner peripheral edge of the center hole 36 are suitably prevented. Moreover, since the groove part 54 is formed in the circumferential direction at equal intervals, the dynamic balance of the drive plate 12 is improved suitably. Furthermore, the groove 54 is formed simultaneously with the processing step of the center hole 36 and the manufacturing process does not increase, so that the manufacturing cost does not increase.
[0027]
As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.
[0028]
For example, the number and shape of the notches 38 or grooves 54 formed in the center hole 36 of the disk 20 of the above-described embodiment take into consideration the dynamic balance of the drive plate 12, the strength of the inner peripheral surface of the center hole 36, and the like. It may be determined arbitrarily and may not necessarily be provided.
[0029]
In addition, the number and shape of the first sub holes 28 or the second sub holes 30 in the above-described embodiment may be arbitrarily determined in consideration of the dynamic balance and strength of the drive plate 12, and are not necessarily provided. Also good.
[0030]
In the above-described embodiment, the torque converter 14 is used as the fluid transmission, but a fluid coupling (fluid coupling) having no torque amplification action may be used.
[0031]
Further, in the small diameter portion 46 of the bearing member 22 of the above-described embodiment, the thickness is reduced toward the opposite end of the large diameter portion 48 of the small diameter portion 46, but this is not necessarily the case. .
[0032]
Further, in the above-described embodiment, the disk 20 is cut and punched by using the punching punch 40 in which the center hole punching die 42 and the notch protrusion 44 are integrally provided. The notch 38 is formed at the same time, but the center hole 36 and the notch 38 are separated from each other by pressing using a punch in which the center hole punching die 42 and the notch protrusion 44 are separately provided. May be formed.
[0033]
In the above-described embodiment, the disc 20 is punched and pressed using a punching punch that is integrally provided with a center punching die and a groove punching die projection formed on the center punching die. The center hole 36 and the groove portion 54 are formed at the same time, but the center hole 36 and the groove portion 54 are formed by pressing using a punch in which the center hole punching die and the groove portion punching die protrusion are separately provided. It may be formed in a separate process.
[0034]
The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a main part of a motor and a drive system of a vehicle to which a drive plate according to an embodiment of the present invention is applied.
FIG. 2A is a front view of a drive plate. (B) is AA sectional drawing shown to Fig.2 (a).
FIG. 3 (a) is a partially enlarged view of the front surface of the center of rotation of the disc. (B) is the fragmentary figure of the AA cross section shown to Fig.3 (a).
FIG. 4 is a perspective view of a punching punch used for punching a disk.
FIG. 5 is a partial enlarged view of a cross section of a rotation center portion of a drive plate. (A) is a figure before a bearing member is crimped. (B) is a figure after the bearing member is crimped.
FIG. 6 is a partial cross-sectional view illustrating an assembled state of the drive plate.
FIG. 7 is a partially enlarged view of a rotation center portion of a disc in another embodiment of the present invention, and corresponds to FIG.
[Explanation of symbols]
10: Engine 12: Drive plate 14: Torque converter (fluid transmission)
18: Crankshaft 20: Disk 22: Bearing member 36: Center hole 38: Notch 46: Small diameter part 48: Large diameter part 54: Groove part

Claims (2)

A disk-shaped vehicle drive plate interposed between an engine and a fluid transmission device and connected to the crankshaft of the engine and the fluid transmission device;
Rutotomoni center hole formed through the rotation center portion, a disc that is notch formed on the inner peripheral corner portion between the one surface and the inner peripheral surface of said central bore,
A cylindrical large-diameter portion having an outer diameter larger than that of the central hole and a cylindrical small-diameter portion having an outer diameter that can be fitted in the central hole are integrally provided, and the outer peripheral surface of the large-diameter portion The crankshaft and the hydrodynamic transmission device are positioned with respect to the peripheral surface, and the end of the small diameter portion is plastically deformed by caulking and is plastically deformed to the outer peripheral side by caulking of the end. A vehicle drive plate, comprising: a bearing member fixed to the disk by being received by the notch and being caulked in the center hole . A disk-shaped vehicle drive plate interposed between an engine and a fluid transmission device and connected to the crankshaft of the engine and the fluid transmission device;
  A central hole is formed through the center of rotation, and a groove is formed in the axial direction of the inner peripheral surface of the central hole so that the inner peripheral edge of one surface communicates with the inner peripheral edge of the other surface. A disc
  A cylindrical large-diameter portion having an outer diameter larger than that of the central hole and a cylindrical small-diameter portion having an outer diameter that can be fitted in the central hole are integrally provided, and the outer peripheral surface of the large-diameter portion The crankshaft and the hydrodynamic transmission device are positioned with respect to the peripheral surface, and the end of the small diameter portion is plastically deformed by caulking and is plastically deformed to the outer peripheral side by caulking of the end. A bearing member fixed to the disk by being received in the groove and being caulked in the central hole
  A vehicle drive plate characterized by comprising:

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