LOCKING DEVICE FOR TORQUE CONVERTER

Abstract

A locking apparatus is provided that includes a locking clutch, a locking piston, an input-side clutch retainer, a spring pack, and the like, wherein a splined fitting for reducing relative rotation between the locking piston and the input-side clutch retainer can be easily and securely mounted; the locking apparatus has a mutual-rotation prevention mechanism configured to prevent relative rotation between the locking piston and the input-side clutch retainer, wherein the mutual-rotation prevention mechanism is a splined fitting in which external teeth installed on an outer periphery of a first spring pack retainer engage with internal teeth formed on an inner periphery of the input-side clutch retainer adjacent to the outer periphery of the first retainer.with the internal teeth configured to engage with the external teeth installed on the outer periphery of the first retaining plate, wherein when the locking piston is installed in the input-side clutch clamping portion, adjustment is made between the splined adjusting pieces of the first retaining plate and the input-side clutch clamping portion before the other engagement process.

Description

LOCKING DEVICE FOR TORQUE CONVERTER TECHNICAL FIELD For example, the present invention relates to a locking device for a hydraulic power transmission device (the so-called torque converter) interposed between a crankshaft of a vehicle engine and an input shaft of a transmission. BACKGROUND OF THE INVENTION A torque converter assembled to an automatic transmission for a vehicle is configured in such a way that a front cover constituting a front portion of the converter housing is rotated by means of a crankshaft, and torque is transmitted between a vane adjacent to a pump impeller of the converter housing and a vane adjacent to a turbine impeller, so that torque is transmitted from an output shaft, which is operated by the turbine impeller, to an input shaft of the transmission. In addition, to improve fuel economy, the torque converter has a locking device that transmits torque from the engine's crankshaft to the transmission via a torsion spring (elastic body) that absorbs shock (torsional vibration) by operating a locking clutch using a locking piston. In this case, in order to increase the response speed (output rate) of the locking piston when a locking clutch operation is stopped, a spring pack having a spring embedded between a clutch clamping part and the locking piston is sometimes used. For example, Patent Document 1 describes the technical principle in which helical springs are installed between a piston member and a flange member facing the piston member. According to Patent Document 1, the flange member and the piston member are always elastically supported by the helical springs in a direction in which the flange member and the piston member are separated from each other. However, according to Patent Document 1, the plurality of helical springs is interposed between the piston member and the flange member, and an independent unit called a spring pack is not implemented, making assembly adjustment difficult. Furthermore, because there is a risk of relative rotation occurring between the locking piston and the input-side clutch clamping portion when one input side accelerates rapidly, a means of preventing relative rotation is required. In this regard, Patent Document 1 describes that the piston element and the flange element are fitted by means of a splined fit to prevent relative rotation between them. However, because the spring pack is not implemented as described above, problems arise because the assembly process is very complicated and it is difficult to accurately install a part for slot adjustment. Related technical document Patent document Patent Document 1: Japanese Patent Open to the Public No. 2011-117517 BRIEF DESCRIPTION OF THE INVENTION Technical problem The present invention has been made in an effort to solve problems of the related art, and an object of the present invention is to provide a locking apparatus that includes a locking clutch, a locking piston, an input-side clutch clamping piece, a spring pack and the like, in which a splined fitting can be easily and safely assembled to reduce relative rotation between the locking piston and the input-side clutch clamping piece. Technical solution To achieve the aforementioned object, a first aspect of the present invention provides a locking apparatus for a torque converter, the locking apparatus comprising: - an input-side clutch retainer fixed to a front cover configured to transmit power from a drive side; - a plurality of clutch discs held by the input-side clutch retainer; - a locking piston configured to press the clutch plates to engage a clutch; a piston guide configured to retain one end of the locking piston; - a spring pack fixed to the locking piston and installed between the locking piston and the input-side clutch retainer;The spring pack has an embedded elastic body configured to press the locking piston in a direction in which the clutch is disengaged; and - a mutual rotation prevention mechanism configured to prevent relative rotation between the locking piston and the input-side clutch retaining portion, wherein the mutual rotation prevention mechanism is a splined fitting in which the external teeth are installed on an outer periphery of a first spring pack retaining plate and engage with the internal teeth formed on an inner periphery of the input-side clutch retaining portion adjacent to the outer periphery of the first retaining plate, the internal teeth being configured to engage with the external teeth installed on the outer periphery of the first retaining plate.Wherein, when the locking piston integrated with the spring pack is installed in the input-side clutch clamping part, the adjustment between the splined adjusting pieces of the first retaining plate and the input-side clutch clamping part is performed before the other engagement process. As previously described, since the part that supports the spring body is a separate unit called the spring pack, it can be mounted on the torque converter after external assembly adjustment. Furthermore, in this case, relative rotation between the input-side clutch retaining part and the locking piston attached to the spring pack can be prevented by spline adjustment. Additionally, because this assembly is performed before the other parts are joined, subsequent assembly can be carried out after verifying the fit, thus reducing the number of assembly adjustment steps and ensuring a secure and safe installation. Furthermore, the locking device for a torque converter according to a second aspect of the present disclosure is the locking device according to the first aspect of the present invention, wherein an outer peripheral portion of the first retaining plate for the splined fitting is bent towards the input-side clutch clamping piece, so that the fit between the splined fitting parts precedes when the locking piston integrated with the spring pack is installed on the input-side clutch clamping piece. As described above, since the outer peripheral part for the spline adjustment of the first retaining plate is integrated with the locking piston—that is, the outer teeth are curved toward the clutch clamping portion on the input side—this part can easily make initial contact during installation. Furthermore, because the subsequent installation process can be carried out after the spline adjustment has been safely performed, the secure assembly process can be completed without the use of any additional parts or mechanisms. Furthermore, this adjusting part is barely visible to the naked eye and difficult to verify in the related art. In contrast, in the present invention, because the adjusting part initially makes contact first, the situation in which the adjusting part loosens can be verified by hand by the operator when the operator installs the adjusting part. rzhRnn / ζζηζ / Ε / γίΛΐ Furthermore, the fitting does not loosen even when a predetermined torque is applied during installation on an automated line. Therefore, the fitting can be checked in any situation to ensure safe installation. Furthermore, with the configuration mentioned above, insufficient adjustment can be detected easily and reliably, thus preventing an assembly defect. Furthermore, the locking device for a torque converter according to a third aspect of the present disclosure is the locking device according to the first aspect of the present invention, wherein an outer peripheral portion of the first splined fitting retainer plate defines a fitting position of a cover hub configured to retain the front cover, the locking piston, and the piston guide, such that the fit between the splined fitting pieces precedes when the locking piston integrated with the spring pack is installed in the input-side clutch retainer piece. As described above, the outer periphery of the retaining plate itself is not bent, and the shape of the front cover and the cover hub are properly aligned. Therefore, the fit between the front cover and the cover hub can be preceded by the fit between the first retaining plate and the input-side clutch retaining piece, so that the subsequent installation process can be carried out ensuring the splined fit. Thus, the secure assembly process can be implemented without the use of any additional part or mechanism. Advantageous effects According to the present invention, it is possible to provide the locking apparatus including the locking clutch, locking piston, input-side clutch clamping part, spring pack and the like, in which the splined adjustment for reducing relative rotation between the locking piston and the input-side clutch clamping part can be easily and securely mounted. BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a longitudinal cross-sectional view of a torque converter including a locking device according to an embodiment of the present invention. Figure 2 is a longitudinal cross-sectional view of the locking apparatus according to the embodiment of the present invention. rzfrAnn / zznz / E / YiAi Figure 3 is a perspective view of a spring pack of the apparatus according to the embodiment of the present invention. Figure 4 is a partial cross-sectional view of the spring assembly of the apparatus according to the embodiment of the present invention. Figure 5 is a plan view from above of a first retaining plate of the apparatus in accordance with the embodiment of the present invention. Figure 6 is a top plan view of a clutch clamping portion on the input side of the apparatus according to the embodiment of the present invention. Figure 7 is a longitudinal sectional view of the clutch clamping portion on the input side of the apparatus according to the embodiment of the present invention. Figure 8A is an explanatory view illustrating an assembly sequence of the apparatus in accordance with the embodiment of the present invention. Figure 8B is an explanatory view illustrating an assembly sequence of the apparatus in accordance with the embodiment of the present invention. Figure 8C is an explanatory view illustrating an assembly sequence of the apparatus in accordance with the embodiment of the present invention. Figure 9A is an explanatory view illustrating a situation in which the locking apparatus is assembled in accordance with the embodiment of the present invention. Figure 9B is an explanatory view illustrating a situation in which the locking apparatus is assembled in accordance with the embodiment of the present invention. Figure 10 is a longitudinal sectional view of a locking device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The following will describe embodiments of the present invention with reference to the drawings. Furthermore, a schematic description of the interval required to achieve the object of the present invention will be provided, focusing on the interval required to describe the relevant parts of the present invention, but omitting the description of publicly known technologies. Figure 1 is a longitudinal sectional view of a torque converter including a locking device according to an embodiment of the present invention and illustrates only the upper side without illustrating the lower side. Figure 2 is a longitudinal sectional view of the locking device according to the embodiment of the present invention that forms part of Figure 1. rzfrAnn / zznz / E / YiAi Torque converter 1 refers to a device for transmitting torque from an engine crankshaft to a transmission input shaft. The unillustrated engine is shown on the right side of the drawing, and an unillustrated transmission is shown on the left side. The "A" in the drawing indicates a rotation axis of torque converter 1. Furthermore, unless otherwise explained later, an inlet side refers to the right side (front cover side) in Figure 1, and an outlet side refers to the left side in Figure 1 opposite the inlet side. Additionally, an inner side or periphery refers to a side near the axis of rotation, and an outer side or periphery refers to a side farther from the axis of rotation. Furthermore, an axial direction refers to a direction in which the axis of rotation extends. As illustrated in Figure 1, the torque converter 1 mainly includes a front cover 11, three types of impellers (a pump impeller 12, a turbine runner 13, a stator vane 14), a locking apparatus 2, a vibration absorption apparatus 3 which includes members such as a retaining plate 31, an outer-side elastic body 32, an inner-side elastic body 33 and a centrifugal pendulum 42, and a turbine hub 51 configured to receive power from the front cover 11. In this case, the power from the front cover 11 is smoothly transmitted to the turbine hub 51 through the impellers in a state where the locking device 2 is not functioning. Meanwhile, when the locking device 2 is operating, the power from the front cover 11 is mechanically transmitted to the turbine hub 51. As illustrated in Figure 2, the locking apparatus 2 includes a locking clutch 17 disposed between the front cover 11 and the turbine hub 51 and includes multiple locking plates, an input-side clutch holding portion 20 and an output-side clutch holding portion 21 configured to hold the locking clutch 17, a locking piston 15, a piston guide 16, a spring pack 60 installed between the locking piston 15 and the input-side clutch holding portion 20, and a drive plate 18 fixedly coupled to the output-side clutch holding portion 21. The locking piston 15 is provided between the front cover 11 and the vibration-absorbing apparatus 3 and is disposed within the clutch clamping portion on the output side 21. The locking piston 15 has an annular shape and a pressure portion 22 that protrudes towards the input side. Furthermore, an inner peripheral part that is disc-shaped is fixed to the cover hub 23, and an outer peripheral part that is disc-shaped has a recessed cylindrical part rzfrAnn / zznz / E / YiAi open towards the outlet side in the axial direction. When the outer peripheral part of the locking piston 15 is bent towards the outlet side in the axial direction and the piston guide 16 is retained on the outer peripheral part as described above, the size of the outer peripheral of the locking piston 15 can be reduced so that a larger mechanism, such as a torsional damper or a pendulum, can be installed outside the locking piston 15 in a state where an overall dimension of the torque converter 1 is maintained. Alternatively, an overall dimension of the lower surface torsional converter 1 can be made compact when the torsional damper in the related art is applied without change. Furthermore, the outer peripheral portion of the locking piston 15 has a bent structure, and the piston guide 16 is held on the bent surface, so that there is an excellent effect in that the locking piston 15 is prevented from moving inadvertently, becoming deformed, and the center ring is properly held. In addition, six rivet fixing holes 151 are provided evenly and circumferentially in the vicinity of a locking piston center 15. The piston guide 16 has the same annular shape on the outlet side of the locking piston 15, and the inner peripheral side, which is disc-shaped, is securely attached to the cover hub 23. The outer peripheral side, which is disc-shaped, is attached to an inner surface of the recessed portion 24 of the locking piston 15 via an O-ring 162, which is a sealing element disposed in a concave portion 161. The locking piston 15 and piston guide 16 are moved axially towards the input side by the oil pressure in the torque converter 1. This movement allows the pressure portion 22 to press the multi-disc clutch 17, thus forming a locked state. Figure 3 is a perspective view of a spring pack of the locking apparatus according to the embodiment of the present invention, Figure 4 is a partial cross-sectional view of the spring pack of the locking apparatus according to the embodiment of the present invention, Figure 5 is a plan view from above of a first retaining plate of the apparatus according to the embodiment of the present invention, Figure 6 is a plan view from above of a clutch clamping part on the input side of the apparatus according to the embodiment of the present invention, and Figure 7 is a longitudinal sectional view of the clutch clamping part on the input side of the apparatus according to the embodiment of the present invention. The spring package 60 includes a first retaining plate 61 installed between the locking piston 15 and the input-side clutch clamping part 20 and attached to the locking piston 15, a second retaining plate 62 installed adjacent to the input-side clutch clamping part 20, a plurality of first spring clamping pieces 611 installed on a surface of the first retaining plate 61 facing the second retaining plate 62, a plurality of second spring clamping pieces 621 installed on a surface of the second retaining plate 62 facing the first retaining plate 61, and coil springs 63 installed between the first spring clamping pieces 611 and the second spring clamping pieces 621. The first retainer plate 61 has an approximately annular, thin plate shape, and an outer periphery of the first retainer plate 61 has a plurality of convex portions, i.e., external teeth 612. A portion adjacent to the external tooth 612 is bent in a Z shape. That is, the first retainer plate 61 has axially bent portions 613 bent toward the second retainer plate 62, and outer peripheral bent portions 614 bent in an outer peripheral direction. Therefore, during an assembly process that will be described below, the outer teeth are initially fitted with the inner teeth of the input-side clutch clamping part 20 by the lengths (heights) of the axially bent parts 613. The plurality of first spring retaining pieces 611 (eighteen first spring retaining pieces 611 in the present embodiment) is provided on one side of the first retaining plate 61 inwards from the external teeth 612. The plurality of first spring retaining pieces 611 may be formed by means of burrs or the like so that they protrude towards the second retaining plate 62 and are fitted to the internal diameters of the helical springs. In addition, six tabs 613 are provided that protrude towards the inner side on the inner peripheral part, and rivet fixing holes 614 are provided in a central part. Furthermore, in this case, the first spring retaining pieces 611 are installed evenly around a circumference, but the first spring retaining pieces 611 are not installed in some positions of the tongue portion 613. For this reason, originally, eighteen spring retaining pieces 611 are provided to be installed at twenty-four points. This is because if the first spring-retaining parts 611 are installed at any location on the tongue portions 613, the rivet fixing holes 614 of the tongue portions 613 must be installed on the farthest inner side, so that one dimension of the first retaining plate 61 increases, and furthermore, if the first retaining plate 61 is attached to the locking piston 15 by rivets, there is a risk of unnecessary rotational force moment or bending stress occurring when the locking operation is performed or released. The plurality of second spring retaining parts 621 (eighteen second spring retaining parts 621 in the present embodiment) are provided on the second retaining plate 62. The plurality of second spring retaining parts 621 may each be in the form of an approximately annular thin plate and be formed by burr or the like. The plurality of second spring retaining parts 621 may project into the first retaining plate 61 and be equipped with the internal diameters of the helical springs 63. Furthermore, an outer periphery of the second retaining plate 62 has a recessed portion 622 bent into an L-shape on the input side in the axial direction. A pointed surface of the recessed portion 622 is in contact with a cylindrical lower surface of the input-side clutch clamping portion 20. Furthermore, the second retaining plate 62 may have an L-shaped portion formed on its inner periphery instead of the recessed L-shaped portion 622 formed on its outer periphery. In either case, the second retaining plate 62 may be in contact with the front cover 11 instead of the input-side clutch retaining portion 20. Alternatively, the second retaining plate 62 may be Z-shaped instead of L-shaped, or a short flat portion of the second retaining plate 62 may be in contact with the input-side clutch clamping portion 20 or the front portion 11. Furthermore, the number of spring retainers and the number of tongue portions are for illustrative purposes. The number of spring retainers and the number of tongue portions can be increased or decreased, and the effects depend on the number of spring retainers and the number of tongue portions. The inlet-side clutch clamping part 20 has an approximately cylindrical shape; a lower surface of one side of the inlet-side clutch clamping part 20 is curved towards the inner peripheral side and fixed to the front cover 11. Furthermore, the external teeth 201 are formed on an outer peripheral surface of the input-side clutch retaining part 20 to retain the multi-disc clutch plate of the locking clutch 17. Meanwhile, the internal teeth 202 are formed on an inner peripheral surface of the input-side clutch retaining part 20 for use in conjunction with the external teeth 201, and the internal teeth 202 can engage with the external teeth 612 of the first retaining plate 61. The following describes an assembly sequence for the rzfrAnn / zznz / E / YiAi locking device according to the embodiment of the present invention. Figures 8A to 8C are explanatory views illustrating an assembly sequence according to the embodiment of the present invention, and Figures 9A and 9B are explanatory views illustrating a situation in which the locking device is assembled according to the embodiment of the present invention. First, the first retaining plate 61 is positioned horizontally so that the first clamping part of the spring 611 is directed upwards, and the internal diameters of the helical springs 63 are adjusted with the first retaining plate 61. Next, the second retaining plate 62 is arranged so that the second spring clamping part 621 is equipped with the internal diameters of the helical springs 63. Furthermore, after installing the helical springs 63, the burr portion between the first retaining plate 61 and the second retaining plate 62 is caulked, so that the first retaining plate 61 and the second retaining plate 62 do not separate even though the first retaining plate 61 and the second retaining plate 62 are upside down. Therefore, the process of partially assembling the spring pack 60 is completed. Furthermore, the assembly sequence of the spring pack 60 is not limited to the assembly sequence mentioned above, and any assembly sequence can be applied as long as the first retaining plate 61, the second retaining plate 62, and the helical spring 63 are integrated and cannot be easily disassembled. Next, the locking piston 15 is positioned approximately horizontally, and the partially assembled spring pack 60 is installed on the locking piston 15 from above in a state where the first retaining plate 61 is placed on the lower side. Next, the rivet holes 614 of the first retaining plate 61 of the spring pack 60 and the rivet holes 151 of the locking piston 15 are secured by rivets. Furthermore, this part is illustrated in Figure 9A, which will be described below. Therefore, the integration of the spring pack 60 and the locking piston 15 is complete. This configuration is illustrated in Figure 8A. Meanwhile, the hub of cover 23 is positioned approximately horizontally, with one of its shafts oriented vertically, and a portion of the hub of cover 23 adjacent to the engine facing upwards. The piston guide 16 is installed in the hub of cover 23. Furthermore, the structure made by integrating the spring pack 60 and the locking piston 15 is installed in the piston guide 16 from above. In this case, the O-ring 162 can be interposed between the inner and outer peripheral sides of the locking piston 15, and the piston guide 16 is fitted between the locking piston 15 and the cover hub 23 by the O-ring 162, so that movement in the axial and diameter directions is restricted. Thus, the piston-side assembly process (piston assembly) is complete. This configuration is illustrated in Figure 8B. Next, the entire front cover 11 is assembled. The front cover 11 is positioned approximately horizontally so that the inner side portion (the transmission side) faces upwards, and the input-side clutch retaining portion 20 and the locking clutch 17 are installed on the front cover 11. This is called the locking clutch assembly. Finally, the piston assembly is inverted (reverse state) and approaches the locking clutch assembly from above. In this case, the external teeth 612 of the outer peripheral portion of the first retaining plate 61, which is part of the piston assembly, engage with the internal teeth 202 of the input-side clutch clamping portion 20 first before the other coupling processes are performed. As described above, the complex fitting installation (the engagement between the external and internal teeth) can be performed before the other engagement processes while verifying the engagement, so that a secure fit can be implemented. This setup is illustrated in Figure 8C. Furthermore, the assembly situation will be described again in detail with reference to Figures 9A and 9B. In a part indicated by A in Figure 9A, the external teeth 612 on the outer peripheral tip of the first retaining plate 61 engage with the internal teeth 201 of the input-side clutch clamping part 20. In this state, in a part indicated by B in the drawing, the mating parts of the front cover 11 and the cover hub 23 are not yet adjacent to each other. In a state where no other restraint is present as described above, the outer teeth 612 of the first retaining plate 61 and the inner teeth 202 of the input-side clutch clamping portion 20 fit together carefully and securely. Furthermore, this adjusting part is barely visible to the naked eye and difficult to check in the related art. In contrast, in the present invention, because the adjusting part makes initial contact, the situation in which the adjusting part loosens can be checked by hand by the operator when installing the adjusting part. Moreover, the adjusting part does not loosen even when a predetermined torque is applied when the adjusting part is installed on an automated line. Therefore, the fitting can be checked in any case, so that the fitting can be installed safely. Furthermore, with the configuration mentioned above, insufficient adjustment can be detected easily and reliably, thus preventing an assembly defect. When the assembly is sufficiently performed and the piston assembly is further pressed against the front cover 11, both the front cover 11 and the cover hub 23 are sufficiently coupled as illustrated in Figure 9B. The following will describe an operation of the locking apparatus in accordance with the embodiment of the present invention. When the locking piston 15 is pressed by hydraulic pressure into the locking clutch 17, the pressure part 22 engages with the locking clutch 17. Therefore, the power from the front cover 11 is transmitted to the input-side clutch clamping part 20, the locking clutch 17, the output-side clutch clamping part 21, and the transmission plate 18, and then transmitted to the turbine hub 51, which is the output side, via an intermediate member. In this case, if the input side accelerates rapidly, there is a risk of relative rotations occurring between the locking piston 15, the input side clutch retainer 20, and the front cover 11 attached to the input side clutch retainer 20. Even in this situation, relative rotation can be avoided because the outer teeth 612 of the outer peripheral surface of the first retaining plate 61 of the spring pack 60 fixedly coupled to the locking piston 15 are securely engaged (locked) with the inner teeth 202 on the inner peripheral side of the input-side clutch clamping portion 20 by the assembly procedure mentioned above. Furthermore, when the locking clutch 17 is disengaged, the locking piston 15 is separated by an elastic force from the helical springs 63 embedded in the spring pack 60, so that the locking state is quickly released. Furthermore, although the spring assembly 60 is attached to the first retaining plate 61 and the locking piston 15 by rivets, the rivet positions are adjacent to the positions of the coil springs 63 in the radial direction. Therefore, when the locking operation of the locking piston 15 is performed or released, less rotational torque or bending stress is generated, allowing for stable operation. A locking device in accordance with another embodiment of the present invention will now be described. Figure 10 is a longitudinal cross-sectional view of the locking device according to another embodiment of the present invention and illustrates a configuration achieved by partially modifying the aforementioned embodiment. Components identical to those of the aforementioned embodiment are indicated by the same part numbers, and a detailed description thereof is omitted. In the present modality, the first retaining plate 61 has a flat shape without having the folded part of the outer peripheral part. Even in this state, the gap between the front cover 11 and the locking piston 15 is small in the clutch area, as illustrated by comparison with the previously mentioned embodiment. Meanwhile, because the engagement position between the front cover 11 and the cover hub 23 is approximately identical to the position in the previously mentioned embodiment, the outer teeth 612 of the first retaining plate 61 and the inner teeth 202 of the input-side clutch clamping piece 20 engage before the other engagement processes, thus achieving an effect identical to that of the previously mentioned embodiment. Furthermore, a means of reducing the gap between the front cover 11 and the locking piston 15, as well as a means of shifting the engagement position between the front cover 11 and the cover hub 23, can be considered a means of mounting the external teeth 612 of the outer peripheral surface of the first retaining plate 61 and the internal teeth 202 of the inner peripheral side of the input-side clutch clamping portion 20 before the other engagement processes in a state where the first retaining plate 61 is flat. However, any means may be applied provided that the means allows the external teeth 612 of the first retaining plate 61 and the internal teeth 202 of the input-side clutch clamping portion 20 to be engaged before the other engagement processes. As described above, the outer periphery of the first retaining plate itself is not bent, and the shapes and positions of the front cover and cover hub are properly aligned. Therefore, the fit between the front cover and the cover hub can be preceded by the fit between the first retaining plate and the input-side clutch retaining piece, so that the subsequent installation process can be carried out ensuring a splined fit. This simplifies the machining of the first retaining plate 61 and allows for a secure assembly process without the use of any additional parts or mechanisms. Furthermore, the present invention is not limited to the aforementioned embodiments, but can be modified and implemented in various ways without departing from the object of the present invention. The embodiments are part of the present technical spirit. rzfrAnn / zznz / E / YiAi Industrial applicability As described above, the present invention has high industrial applicability since the present invention is widely used in industries to improve the performance of torque converters in vehicles such as automobiles. Reference numbers 1: Torque converter 2: Locking device 11: Front cover 15: Locking piston 16: Piston guide 17: Locking clutch 20: Input side clutch retaining piece 21: Output side clutch retaining piece 23: Deck Cube 51: Turbine Hub 60: Spring package 61: First retainer plate

Claims

1. A locking device for a torque converter, the locking device comprising: - an input-side clutch retainer fixed to a front cover configured to transmit power from a drive side; - a plurality of clutch discs held by the input-side clutch retainer; - a locking piston configured to press the clutch plates to engage a clutch; - a piston guide configured to retain one end of the locking piston; - a spring pack fixed to the locking piston and installed between the locking piston and the input-side clutch retainer,The spring pack has an embedded elastic body configured to press the locking piston in a direction in which the clutch is disengaged; and - a mutual rotation prevention mechanism configured to prevent relative rotation between the locking piston and the input-side clutch retainer, wherein the mutual rotation prevention mechanism is a splined fitting in which external teeth installed on an outer periphery of a first spring pack retainer plate engage with internal teeth formed on an inner periphery of the input-side clutch retainer adjacent to the outer periphery of the first retainer plate, the internal teeth being configured to engage with the external teeth installed on the outer periphery of the first retainer plate,and wherein when the locking piston integrated with the spring pack is installed in the input-side clutch clamping portion, the adjustment between the splined adjusting pieces of the first retaining plate and the input-side clutch clamping portion is performed prior to the other engagement process.

2. The locking apparatus according to claim 1, further characterized in that an outer peripheral part of the first retaining plate for the splined adjustment is bent towards the clutch clamping part on the input side, so that the adjustment between the splined fitting parts precedes when the locking piston integrated with the spring pack is installed on the clutch clamping part on the input side. 3 - The locking apparatus according to claim 1, further characterized in that an outer peripheral portion of the first retaining plate for the splined adjustment defines an adjustment position of a cover hub configured to hold the front cover, the locking piston and the piston guide so that the adjustment between the splined adjustment pieces precedes when the locking piston integrated with the spring pack is installed in the clutch clamping piece on the input side.

Images