Locking device for torque converter

Abstract

The present invention relates to a locking device for a torque converter. Compared with the prior art, the locking device has a simple structure, thereby reducing the manufacturing cost, and minimizes the installation space of the dynamic damper, thereby reducing the overall size of the torque converter.

Description

Technical Field

[0001] The present invention relates to a locking device for a torque converter of a hydraulic transmission device. More specifically, the present invention relates to a locking device for a torque converter, which has a simple structure compared to the prior art, thereby reducing manufacturing costs, and minimizes the installation space of a dynamic damper, thereby reducing the overall size of the torque converter. Background Art

[0002] A torque converter having a lock-up device is widely used as a hydraulic transmission device that transmits power generated from a vehicle engine to a transmission.

[0003] The locking device is a device for mechanically connecting the front housing and the turbine of the torque converter to transmit torque, and is arranged in the space between the turbine and the front housing. The torque is directly transmitted from the front housing to the turbine without passing through the pump wheel through this locking device.

[0004] Typically, the locking device has a piston and a damping mechanism.

[0005] The piston is arranged to be movable along the rotation axis direction. When pressed on the front housing, the piston fits with the front housing and receives torque from the front housing through friction to rotate.

[0006] The damping mechanism absorbs the torsional vibration transmitted to the front housing, attenuates it and transmits it to the output component. The damping mechanism includes an elastic body, preferably a coil spring, which elastically connects the input component and the output component that rotate integrally with the piston.

[0007] On the other hand, in addition to the damping mechanism for absorbing and attenuating torsional vibrations, a technology for lowering the resonance frequency to below the practical rotational speed to improve the vibration attenuation performance has also been developed and applied to provide a dynamic damper with an inertial mass body on the torque transmission path.

[0008] In this regard, as a prior document, Korean Patent Gazette No. 10-1220123 discloses a dynamic damper including: a connecting member having an inertial mass body fixed to one end thereof; and a coil spring for elastically connecting the other end of the connecting member and an output member.

[0009] However, the dynamic damper disclosed in the prior art is configured to connect the inertial mass body to the coil spring via a separate connecting member, and thus there are problems in that the product cost is increased and the structure is somewhat complicated.

[0010] In addition, the dynamic damper disclosed in the prior document has a structure in which the inertial mass body is arranged radially outside the coil spring of the damping mechanism, and an additional installation space for the inertial mass body must be ensured inside the torque converter, so there is a problem of increasing the overall size of the torque converter.

[0011] Prior Art Literature

[0012] Patent Document 0001: Korean Patent Gazette No. 10-1220123 Summary of the invention

[0013] Technical issues

[0014] The present invention is proposed to solve the above-mentioned problem, and aims to provide a locking device for a torque converter, which directly sets the inertial mass body on the output component, thereby omitting the connecting component, simplifying the structure and reducing the manufacturing cost.

[0015] In addition, the present invention is intended to provide a locking device for a torque converter, which can reduce the overall size and achieve miniaturization by reducing the installation space for the inertial mass body by arranging the inertial mass body radially inside relative to the coil spring constituting the damping mechanism.

[0016] Technical Solution

[0017] In order to solve the above problems, a locking device for a torque converter according to the present invention is characterized in that the locking device includes: an input component, which receives torque input from a front housing through friction; an output component, which is connected to the turbine for integral rotation and is arranged to be relatively rotatable relative to the input component; a first elastomer and a second elastomer, which elastically connect the input component and the output component respectively relative to the rotation direction; and a dynamic damper, which is directly arranged on the output component, the first elastomer is arranged on the radial outside relative to the second elastomer, and the dynamic damper is arranged between the first elastomer and the second elastomer along the radial direction.

[0018] The dynamic damper includes: an inertial mass body, which is relatively rotatable against the output component; and a third elastic body, which elastically connects the inertial mass body and the output component relative to the rotation direction, and the inertial mass body and the third elastic body are arranged to at least partially overlap with the first elastic body relative to the rotation axis direction when viewed from the radial direction.

[0019] The inertial mass body includes: a first mass plate, which is abutted against one side of the output component; and a second mass plate, which is abutted against the other side of the output component and rotates integrally with the first mass plate, and the first mass plate and the third elastic body are arranged to overlap with the first elastic body as a whole relative to the rotation axis direction from the radial direction.

[0020] In addition, the dynamic damper further includes an additional mass body, which is used to increase inertia. The additional mass body is arranged on the radial inner side of the second mass plate and connected to the second mass plate.

[0021] In addition, the additional mass body is formed integrally with the second mass body.

[0022] In addition, the additional mass body is manufactured separately from the second mass body and then fixed to the second mass body.

[0023] Furthermore, after the first elastic body is compressed to the maximum extent by the rotation of the input member, the compression of the second elastic body starts.

[0024] Effects of the Invention

[0025] According to the locking device for a torque converter of the present invention, the inertial mass body is directly arranged on the output component, thereby omitting the connecting component, simplifying the structure and reducing the manufacturing cost.

[0026] Furthermore, according to the lock-up device for a torque converter of the present invention, the installation space for the inertial mass body is reduced by arranging the inertial mass body radially inward relative to the coil spring constituting the damping mechanism, thereby reducing the overall size and achieving miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 2 is a cross-sectional view in the direction of the rotation axis of a torque converter having a locking device according to an embodiment of the present invention.

[0028] Figure 2 yes Figure 1 A partial enlarged view of .

[0029] Figure 3 is with Figure 1 A cross-sectional view of the torque converter in a direction perpendicular to the rotation axis is shown.

[0030] Figure 4 is a perspective view of a drive plate of a locking device according to an embodiment of the present invention.

[0031] Figure 5is a perspective view of a driven plate and a dynamic damper assembly of a locking device according to an embodiment of the present invention.

[0032] Figure 6 yes Figure 5 Exploded three-dimensional diagram.

[0033] Figure 7 yes Figure 5 A cross-sectional view of the driven plate and dynamic damper assembly in the direction of the rotation axis is shown.

[0034] Figure 8 4 is a cross-sectional view in the direction of the rotation axis of a driven plate and a dynamic damper assembly of a locking device according to another embodiment of the present invention.

[0035] Fig. 9 It is a schematic diagram used to explain the torque transmission process of the torque converter. DETAILED DESCRIPTION

[0036] Hereinafter, a lock-up device for a torque converter according to the present invention will be described in detail with reference to the accompanying drawings.

[0037] The present invention can be subjected to various changes and has various embodiments, so specific embodiments are exemplified for detailed description. However, the present invention is not limited to specific implementations, and all changes, equivalents or substitutes made within the technical concept and technical scope of the present invention should fall within the scope of the present invention.

[0038] In the present invention, terms such as "first", "second", etc. may be used to describe various components, but the components are not limited by these terms. These terms are only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

[0039] The term "and / or" may include a combination of a plurality of related items or any items among the plurality of related items.

[0040] When a component is described as being "connected" or "coupled" to another component in this specification, it should be understood that the component may be directly connected or coupled to the other component, but other components may exist between the component and the other component. When a component is described as being "directly connected" or "directly coupled" to another component in this specification, it should be understood that no other components exist between the component and the other component.

[0041] The terminology used herein is for the purpose of describing specific example embodiments only and is not intended to limit the present invention. Unless the context clearly indicates otherwise, a singular expression is intended to include a plural expression.

[0042] In the present application, the terms "including" or "having" are intended to indicate the presence of the features, quantities, steps, operations, components, parts or combinations thereof described in the specification, and do not preclude the possibility of the presence of one or more other features, quantities, steps, operations, components, parts or combinations thereof.

[0043] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art. Terms defined in dictionaries should be interpreted as having the same meaning as that disclosed in the relevant technical literature and this article, and should not be interpreted in an idealized or overly formal sense.

[0044] In addition, the following embodiments are provided in order to more completely explain the present invention to those skilled in the art, and the shapes and sizes of components are exaggerated in the drawings for clarity.

[0045] <Overall structure of torque converter>

[0046] Figure 1 is a cross-sectional view of the rotating shaft of the torque converter 1 in the XX direction, Figure 2 yes Figure 1 A partial enlarged view of Figure 3 is with Figure 1 The cross-sectional view of the torque converter 1 in the direction perpendicular to the rotation axis XX is shown. Figures 1 to 3 The overall structure of the torque converter 1 having the locking device 6 according to one embodiment of the present invention will be described.

[0047] The torque converter 1 is a device for transmitting power from the crankshaft (not shown) of the engine to the input shaft (not shown) of the transmission, and includes a front housing 2 into which the crankshaft rotational force is input, a pump wheel 3 connected to the front housing 2, a turbine 4 connected to the output hub 43, a stator 5 arranged between the pump wheel 3 and the turbine 4, and a locking device 6 arranged between the front housing 2 and the turbine 4.

[0048] The pump wheel 3 is fixed on the front housing 2 , and a fluid chamber is formed inside by the front housing 2 and the pump wheel 3 .

[0049] The turbine 4 is disposed in the fluid chamber so as to face the pump impeller 3. The turbine 4 includes a turbine shell 41, a plurality of turbine blades 42 fixed to the turbine shell 41, and an output hub 43 fixed to the turbine shell 41 by rivets R2.

[0050] The output hub 43 is connected to the input shaft of a transmission (not shown).

[0051] The stator 5 is a mechanism for adjusting the flow rate of the hydraulic oil from the turbine 4 to the pump impeller 3 , and is provided between the pump impeller 3 and the turbine 4 .

[0052] <Structure of locking device>

[0053] The function of the locking device 6 is to mechanically connect the front housing 2 and the turbine 4 as required. Figure 1 The arrangement shown is in the space between the front housing 2 and the turbine 4 .

[0054] like Figure 2 As shown, the locking device 6 has a piston 61 and a driving plate 62 as an input component, a driven plate 63 as an output component, a first damper D1 and a second damper D2 as a damping mechanism, which elastically connect the driving plate 62 and the driven plate 63 respectively, and a dynamic damper DD directly arranged on the driven plate 63 to improve the vibration attenuation performance.

[0055] piston

[0056] The piston 61 has a function of switching the torque transmission path between the front housing 2 and the turbine 4 and is configured to directly receive the torque of the front housing 2 by friction when it is hydraulically pressed toward the front housing 2 and abuts against the inner surface of the front housing 2 .

[0057] To this end, the radial inner end of the piston 61 is supported by the output hub 43 so as to be movably supported along the rotation axis XX direction, and is supported so as to be relatively rotatable relative to the output hub 43. In addition, a friction member 61a is provided on one side of the piston 61 facing the inner side of the front housing 2 as a device for increasing friction so that the torque of the front housing 2 is effectively transmitted to the piston 61.

[0058] On the other hand, the piston 61 of the locking device 6 according to an embodiment of the present invention, in addition to the above-mentioned function of switching the torque transmission path between the front housing 2 and the turbine 4, also has the function of preventing the multiple first coil springs 64 as the first damper D1 and the multiple second coil springs 65 as the second damper D2 described later from falling off and effectively supporting them.

[0059] In order to prevent the first coil spring 64 from falling off and to support it, the outer peripheral side of the piston 61 has a support edge 61b formed by bending along the rotation axis XX direction. Figure 2 As shown, the support edge 61b is formed integrally with the piston 61 by bending a portion of the outer circumference of the substantially disc-shaped piston 61 in the direction of the rotation axis XX, and the free end side of the support edge 61b is partially bent radially inward.

[0060] In order to prevent the second coil spring 65 from coming off and to support it, the inner peripheral surface of the piston 61 on the radial inner side where the second coil spring 65 is provided is partially bent to correspond to the shape of the second coil spring 65 .

[0061] The supporting edge 61b, the inner circumferential surface shape of the piston 61, and the outer clamping protrusion 62c and the inner clamping protrusion 62e of the drive plate 62 described above can prevent the first coil spring 64 and the second coil spring 65 from falling off in the radial direction and the direction of the rotation axis XX. There is no need to add additional components. The first coil spring 64 and the second coil spring 65 can be effectively supported by a relatively simple structure.

[0062] Driver board

[0063] The drive plate 62 is fixed to the piston 61 and functions as an input member together with the piston 61 , and also functions to support the first coil spring 64 and the second coil spring 65 corresponding to the damping mechanisms D1 and D2 .

[0064] The drive plate 62 is firmly fixed to the piston 61 at a plurality of locations by rivets R1 to function as an input member together with the piston 61 .

[0065] In addition, the drive plate 62 has an outer stopper 62b, an outer clamping protrusion 62c, an inner stopper 62d, and an inner clamping protrusion 62e as a means for transmitting the input torque to the driven plate 63 described later through the first coil spring 64 and the second coil spring 65. The specific structure of the drive plate 62 is shown in FIG. Figure 4 middle.

[0066] like Figure 4 As shown, the outer locking portion 62b is a portion of the outer peripheral portion of the main body portion 62a of the driving plate 62 that is bent and extended along the direction of the rotation axis XX. A plurality of outer locking portions 62b are formed on the outer peripheral portion of the main body portion 62a and are arranged between the ends of a plurality of first coil springs 64. The outer locking portions 62b support the ends of the first coil springs 64 in the rotation direction.

[0067] The outer clamping protrusion 62c is a part for supporting the first coil spring 64 in the radial direction, and is formed by cutting a part of the outer peripheral part of the main body 62a and bending it in the direction of the rotation axis XX, and is arranged between the outer stopper parts 62b in the rotation direction. The outer clamping protrusion 62c is in a state of contacting the first coil spring 64 on the radial inner side, and the supporting edge 61b of the piston 61 is in a state of contacting the first coil spring 64 on the radial outer side, forming a radial support structure for the first coil spring 64.

[0068] The inner clamping protrusion 62e is used to support the second coil spring 65 in the radial direction and the rotation axis XX direction, and is formed by partially cutting and bending the portion of the main body 62a adjacent to the radial inner end, and a pair is formed on the radial inner side and radial outer side, respectively, as shown in the figure. The pair of inner clamping protrusions 62e cooperate with the inner side surface of the piston 61 to form a support structure for the second coil spring 65.

[0069] On the other hand, in order to form the inner clamping protrusion 62e, an opening is formed by cutting, and the second coil spring 65 is placed in the opening. The two ends of the opening in the circumferential direction abut against the two ends of the second coil spring 65, and these two ends in the circumferential direction function as the inner locking portion 62d for the second coil spring 65.

[0070] As described above, the outer stopper 62b, the inner stopper 62d, the outer clamping protrusion 62c, the inner clamping protrusion 62e, etc. are formed by partially cutting or bending the main body 62a of the driving plate 62, and are all integrated with the main body 62a. Therefore, it is possible to omit additional components for transmitting torque or holding the first coil spring 64 and the second coil spring 65, so that the structure of the locking device 6 can be simplified, and the manufacturing cost can be significantly reduced compared with the past.

[0071] First elastic body-first coil spring 64

[0072] As the first elastic body constituting the first damper D1, the first coil spring 64 elastically connects the drive plate 62 and the driven plate 63 described later in the rotation direction to play the function of absorbing torsional vibration, and is supported by the supporting edge 61b of the piston 61, the outer clamping protrusion 62c of the drive plate 62 and the inner surface of the piston 61 in the XX direction of the rotation axis and in the radial direction.

[0073] In addition, the first coil spring 64 is supported by the outer locking portion 62 b of the drive plate 62 and the outer locking portion 63 b of the driven plate 63 so as to be elastically deformable in the rotation direction.

[0074] Second elastic body-second coil spring 65

[0075] As the second elastic body constituting the second damper D2, the second coil spring 65 elastically connects the drive plate 62 and the driven plate 63 described later in the rotation direction so as to absorb torsional vibration and transmit torque. Compared with the above-mentioned first coil spring 64, the second coil spring 65 is supported radially inwardly along the direction of the rotation axis XX and in the radial direction by the inner surface of the piston 61 and the inner clamping protrusion 62e of the drive plate 62.

[0076] In addition, the second coil spring 65 is supported by the inner stopper 62d of the drive plate 62 so as to be elastically deformable in the rotation direction. Figure 3As shown, unlike the first coil spring 64 , in the initial state where the torque converter 1 is not started, the second coil spring 65 is arranged to maintain a state of being spaced apart from the inner locking portion 63 c of the driven plate 63 by a predetermined angle α.

[0077] That is to say, Figure 3 As shown, both ends of the first coil spring 64 always maintain contact with the outer stopper 62b of the drive plate 62 and the outer stopper 63b of the driven plate 63, but the second coil spring 65 maintains a non-contact state with the inner stopper 63c of the driven plate 63 in the initial state.

[0078] Therefore, after torque is input to the piston 61 and the drive plate 62 so that the first coil spring 64 is compressed to a degree corresponding to the angle α, the inner stopper 63 c of the driven plate 63 contacts the second coil spring 65 and then starts to compress the second coil spring 65 .

[0079] In this way, when the first coil spring 64 is compressed to a predetermined amount or more, preferably to the maximum extent, and it is difficult to expect it to function as a damper, the second coil spring 65 can function as a second damper D2 in a supplementary and auxiliary manner. Therefore, compared with the prior art, the first coil spring 64 as the main damper can be further miniaturized, thereby miniaturizing the torque converter 1 and significantly reducing the manufacturing cost.

[0080] Follower Plate

[0081] The driven plate 63 is connected to the turbine 4 so as to rotate together with the turbine 4. The driven plate 63 as an output component is arranged to be relatively rotatable relative to the piston 61 and the drive plate 62 so that the torque transmitted from the piston 61 and the drive plate 62 as input components via the first coil spring 64 and the second coil spring 65 can be finally output to the output hub 43. Figure 5 and Figure 6 The structure of the driven plate 63 is shown in detail in FIG.

[0082] Reference Figure 5 and Figure 6 The driven plate 63 includes an annular outer plate body portion 63a, an annular inner plate body portion 63e, and a connecting portion 63f that bridges the outer plate body portion 63a and the inner plate body portion 63e, and the inner plate body portion 63e is simultaneously fixed to the output hub 43 and the turbine shell 41 by multiple rivets R2.

[0083] An outer locking portion 63b, a first spring hole 63g and a stop hole 63h are formed on the outer plate body 63a. The torque is transmitted to the outer locking portion 63b through the first coil spring 64. The first spring hole 63g is used to accommodate the third coil spring 68 of the dynamic damper DD described later, and the stop hole 63h is used to limit the rotation range of the mass body of the dynamic damper DD.

[0084] The outer locking portion 63b is a portion of the outer periphery of the annular outer plate body portion 63a that is bent and extended in the direction of the rotation axis XX. A plurality of outer locking portions 63b are formed on the outer periphery of the plate body portion 63a and are arranged between the ends of the first coil spring 64. The outer locking portions 63b support the ends of the first coil spring 64 in the rotation direction.

[0085] In order to maintain the contact state with the first coil spring 64, as Figure 3 As shown, the width of the outer locking portion 63 b of the driven plate 63 in the rotation direction is set to be substantially the same as the width of the outer locking portion 62 b of the driving plate 62 in the rotation direction.

[0086] A plurality of first spring holes 63g are formed in the circumferential direction corresponding to the number of the third coil springs 68 so as to accommodate the third coil springs 68 constituting the dynamic damper DD. The end surfaces on both sides of the first spring hole 63g remain in contact with the third coil spring 68, thereby acting as an intermediate stopping portion 63d, and the elastic force of the third coil spring 68 acts on the intermediate stopping portion 63d.

[0087] The stopper hole 63h is a portion through which the rivet R3 of the first mass plate 66 and the second mass plate 67 of the dynamic damper DD described later integrally extends, which is formed between the first spring holes 63g and extends a predetermined length in the rotation direction. The relative rotation amount of the driven plate 63 with respect to the first mass plate 66 and the second mass plate 67 described later is limited to the rotation direction length of the stopper hole 63h.

[0088] The connecting portion 63f is a portion that connects the outer plate portion 63a and the inner plate portion 63e in a bridge-like manner, and is preferably manufactured by partially cutting off the middle portion between the outer plate portion 63a and the inner plate portion 63e by stamping a disc-shaped plate-like member. The two side surfaces of the connecting portion 63f contact the second coil spring 65 during the torque transmission process, thereby functioning as the inner locking portion 63c, thereby compressing the second coil spring 65.

[0089] Inertial mass

[0090] As an inertial mass body constituting the dynamic damper DD, the locking device 6 according to an embodiment of the present invention includes a first mass plate 66 and a second mass plate 67, which are respectively arranged on two side surfaces of the outer plate body 63a of the driven plate 63 so as to be relatively rotatable relative to the driven plate 63 serving as the output component.

[0091] like Figure 6 and Figure 7 As shown, the first mass plate 66 and the second mass plate 67 are formed as plate-like annular components similar to the shape of the outer plate body 63 a of the driven plate 63 and are respectively disposed against both side surfaces of the outer plate body 63 a of the driven plate 63 .

[0092] In addition, a space is radially provided between the first coil spring 64 and the second coil spring 65, and from a radial point of view, the first mass plate 66 and the second mass plate 67 are arranged to at least partially overlap with the first coil spring 64 relative to the direction XX of the rotation axis. Preferably, the first mass plate 66 and the third coil spring 68 described later are arranged to overlap with the first coil spring 64 as a whole relative to the direction XX of the rotation axis.

[0093] That is, the inertial mass body that is conventionally provided as an integral body is split and provided in the form of annular plates on both sides of the driven plate 63, so that the space occupied by the inertial mass body is minimized, and is provided in the space between the first coil spring 64 and the second coil spring 65, rather than radially beyond the range of the first coil spring 64, thereby significantly reducing the radial dimension of the locking device 6. Furthermore, from a radial point of view, the first mass plate 66 and the second mass plate 67 at least partially overlap with the first coil spring 64 relative to the XX direction of the rotation axis, thereby reducing the XX direction dimension of the locking device 6.

[0094] At this time, the first mass plate 66 and the second mass plate 67 are connected to each other by the rivet R3 and work as a whole to have the same effect as a single mass body. To this end, rivet holes 66c and 67c through which the rivet R3 extends are respectively formed on the plate body 66a of the first mass plate 66 and the plate body 67a of the second mass plate 67. As described above, the rivet R3 extends through the stop hole 63h of the driven plate 63, so under the interaction of the rivet R3 and the stop hole 63h, the relative rotation amount of the driven plate 63 relative to the first mass plate 66 and the second mass plate 67 is limited to the rotation direction length of the stop hole 63h.

[0095] In addition, unlike the prior art, the first mass plate 66 and the second mass plate 67 are arranged to be directly connected to the third elastic body as a damping spring, preferably to the third coil spring 68, without an intermediate connection component.

[0096] To this end, the first mass plate 66 and the second mass plate 67 have a second spring hole 66b and a third spring hole 67b, respectively, so as to cooperate with each other to accommodate the third coil spring 68. Both end surfaces of the second spring hole 66b and the third spring hole 67b are in contact with both ends of the third coil spring 68 to function as spring stoppers 66d and 67d that press the two ends of the third coil spring 68 during the damping action.

[0097] The second spring hole 66 b and the third spring hole 67 b are formed to have substantially the same rotational length as that of the first spring hole 63 g of the driven plate 63 .

[0098] In this way, the first mass plate 66 and the second mass plate 67 are configured to be directly connected to the third coil spring 68, which is different from the prior art and does not require an intermediate connecting component, thereby simplifying the structure of the locking device 6 and significantly reducing the manufacturing cost.

[0099] In addition, if Figure 7 As shown, the second spring hole 66b and the third spring hole 67b of the first mass plate 66 and the second mass plate 67 can be formed so that the radial width L1 of the inner side surface facing the driven plate 63 is greater than the radial width L2 of the outer side surface, and the radial width L2 of the outer side surface is smaller than the outer diameter L3 of the third coil spring 68.

[0100] By setting the relationship between the radial width L1 of the inner side surface and the radial width L2 of the outer side surface of the second spring hole 66b and the third spring hole 67b of the first mass plate 66 and the second mass plate 67 in this way, the axial support and anti-slip structure of the third coil spring 68 can be realized without setting additional additional components or further processing the first mass plate 66 and the second mass plate 67.

[0101] Further, it is necessary to minimize the space occupied by the inertial mass body while increasing the damping capacity of the dynamic damper DD according to the magnitude and resonance frequency of the torque transmitted to the driven plate 63. To this end, an additional mass body 69 for increasing the inertial mass body's inertia may be included.

[0102] like Figure 7 As shown, the additional mass body 69 may be formed into a ring shape extending radially inward from the radial inner side of the second mass plate 67, and may be provided integrally with the second mass body. At this time, the additional mass body 69 is preferably provided to have a cross-sectional shape corresponding to the shape of the space between the second coil spring 65 and the turbine housing 41 to improve space utilization.

[0103] However, in this case, the shape and size of the additional mass body 69 shown in the figure can be variously modified according to the required damping capacity, and these modifications should also fall within the scope of the present invention.

[0104] Figure 8 As another embodiment of the locking device 6 according to the present invention, a structure is shown in which the additional mass body 69 is manufactured separately from the second mass plate 67 and then connected and fixed to the second mass plate 67 .

[0105] As described above, it is necessary to apply different damping capacities of the dynamic damper DD according to the magnitude and resonance frequency of the torque transmitted to the driven plate 63. The damping capacity of the dynamic damper DD can be changed by optimizing the design of the additional mass body 69 to suit the torque and the resonance frequency and by connecting the optimized additional mass body 69 to the second mass plate 67.

[0106] As described above, by manufacturing the additional mass body 69 separately from the second mass plate 67, other components of the dynamic damper DD other than the additional mass body 69 can be shared, so that the manufacturing cost of the locking device 6 and the torque converter 1 can be significantly reduced compared with the prior art.

[0107] Figure 8 , an embodiment is shown in which a stepped first joint portion 67e is formed on the second mass plate 67, and a corresponding stepped second joint portion 69a is formed on the additional mass body 69, and a welding portion 70 is formed at their joint position to fix them to each other. However, the present invention is not limited to the above embodiment, and the connection structure and connection method between the second mass plate 67 and the additional mass body 69 can adopt various modifications, and these modifications should also fall within the scope of the present invention.

[0108] The third elastic body

[0109] The third coil spring 68, which serves as a third elastic body that elastically connects the first mass plate 66, the second mass plate 67 and the output component driven plate 63 relative to the rotation direction, has its two ends supported by the middle locking portion 63d of the first spring hole 63g and the spring locking portions 66d and 67d of the first mass plate 66 and the second mass plate 67 so as to be elastically deformable in the rotation direction.

[0110] Therefore, when the driven plate 63 rotates relative to the first mass plate 66 and the second mass plate 67, the third coil spring 68 is compressed in the rotation direction, whereby a vibration having an opposite phase to the vibration input to the driven plate 63 is applied to the driven plate 63, and the torque in the vibration attenuation state is finally transmitted to the output hub 43.

[0111] <Working of Torque Converter>

[0112] Refer to the following Fig. 9 The operation of the torque converter 1 having the lock-up device 6 according to one embodiment of the present invention will be described.

[0113] When the front housing 2 and the pump impeller 3 rotate, hydraulic oil flows from the pump impeller 3 to the turbine 4, and power is transmitted from the pump impeller 3 to the turbine 4 through the hydraulic oil. The power transmitted to the turbine 4 is transmitted to the input shaft of the transmission (not shown) via the output hub 43.

[0114] If the rotation speed of the input shaft is kept substantially constant, power starts to be transmitted through the lock device 6. More specifically, the piston 61 moves toward the engine side according to the change in hydraulic pressure, and the friction member 61a of the piston 61 presses the inner side surface of the front housing 2.

[0115] As a result, the piston 61 rotates integrally with the front housing 2 , and power is transmitted from the front housing 2 to the drive plate 62 through the piston 61 .

[0116] When power is transmitted to the driving plate 62, first the first coil spring 64 is compressed along the rotation direction between the outer stopper 62b of the driving plate 62 and the outer stopper 63b of the driven plate 63, and then the second coil spring 65 is compressed along the rotation direction between the inner stopper 62d of the driving plate 62 and the inner stopper 63c of the driven plate 63, so that the power with torsional vibration attenuation is transmitted to the driven plate 63.

[0117] On the other hand, when power is transmitted to the driven plate 63, the third coil spring 68 is compressed in the rotation direction between the intermediate stop portion 63d of the driven plate 63 and the spring stop portions 66d and 67d of the first mass plate 66 and the second mass plate 67, and thus a vibration having an opposite phase to the vibration input to the driven plate 63 is transmitted to the driven plate 63 through the third coil spring 68.

[0118] As a result, the vibration-damped power is finally transmitted to the turbine 4 and the output hub 43 via the driven plate 63 .

[0119] As described above, those skilled in the art to which the present invention belongs may understand that the technical features of the present invention described above may be implemented in other specific ways without changing the technical ideas or essential features of the present invention.

[0120] Therefore, it should be understood that the above embodiments are exemplary in all aspects and not restrictive. The scope of the present invention is subject to the claims rather than the foregoing detailed description, and all changes or modifications derived from the content and scope of the claims and equivalent concepts fall within the scope of the present invention.

[0121] Explanation of symbols

[0122] 1: Torque converter 2: Front housing

[0123] 3: Pump wheel 4: Turbine

[0124] 5: Stator 6: Locking device

[0125] 61: Piston 62: Drive plate

[0126] 63: driven plate 64: first coil spring

[0127] 65: Second coil spring 66: First mass plate

[0128] 67: Second mass plate 68: Third coil spring

[0129] 69: Additional mass

Claims

1. A locking device for a torque converter, which is arranged between a front housing connected to an output side of an engine and a turbine, the locking device comprising: an input member that receives torque input from the front housing through friction; An output member connected to the turbine for integral rotation and arranged to be relatively rotatable with respect to the input member; A first elastic body and a second elastic body, which elastically connect the input component and the output component respectively with respect to the rotation direction; as well as A dynamic damper is directly arranged on the output component, the dynamic damper comprises an inertial mass body and a third elastic body, the inertial mass body is relatively rotatable relative to the output component and is arranged against the output component, the third elastic body elastically connects the inertial mass body and the output component relative to the rotation direction, Wherein, the inertial mass body comprises: A first mass plate disposed against a side surface of the output component; and a second mass plate, which is disposed against another side of the output component and rotates integrally with the first mass plate; The first elastic body is arranged radially outward relative to the second elastic body. Wherein, the dynamic damper is arranged between the first elastic body and the second elastic body along the radial direction, and The inertial mass body and the third elastic body are arranged to at least partially overlap with the first elastic body relative to the rotation axis direction when viewed from the radial direction.

2. The locking device for a torque converter according to claim 1, wherein: The dynamic damper also includes an additional mass body, which is used to increase inertia. The additional mass body is disposed radially inward of the second mass plate and connected to the second mass plate.

3. The locking device for a torque converter according to claim 2, wherein: The additional mass body is formed integrally with the second mass plate.

4. The locking device for a torque converter according to claim 2, wherein: The additional mass body is manufactured separately from the second mass plate and then fixed to the second mass plate.

5. The locking device for a torque converter according to claim 1, wherein: After the first elastic body is compressed to the maximum extent by the rotation of the input member, the compression of the second elastic body starts.

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