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 and improving the damping capacity of the dynamic damper.

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, and can also improve the damping capacity of the dynamic damper. 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. 10-2017-0078607 discloses a dynamic damper in which an inertial mass body is connected to an outer end of an output component through a coil spring.

[0009] However, the dynamic damper disclosed in the above-mentioned prior art is a torsional damper, and is disposed radially outwardly relative to the outer coil spring (equivalent to the first damping mechanism), so there is a problem that the radial size of the torque converter increases.

[0010] In addition, for the dynamic damper disclosed in the above-mentioned prior document, it is difficult to ensure sufficient size for the inertial mass body due to the limitation of the space occupied by the dynamic damper, so the inertial force of the inertial mass body is insufficient, and thus there is a problem of poor damping performance of the dynamic damper.

[0011] In addition, in the dynamic damper disclosed in the above-mentioned prior art, the radially outer end portion of the output member is extended to form a connection portion with respect to the dynamic damper, so that the shape of the output member becomes complicated and the manufacturing cost of the output member increases.

[0012] Prior Art Literature

[0013] Patent Document 0001: Korean Patent Gazette No. 10-2017-0078607 Summary of the invention

[0014] Technical issues

[0015] The present invention is proposed to solve the above-mentioned problems. The present invention aims to provide a locking device for a torque converter, in which a dynamic damper is arranged radially inward relative to a coil spring constituting a torsional damping mechanism, and the dynamic damper is directly arranged on an output component without the need for connecting components, so as to reduce the radial size of the torque converter, thereby achieving miniaturization.

[0016] In addition, the present invention aims to provide a locking device for a torque converter, which ensures the installation space of an additional inertial mass body on the radial inner side of the locking device by simplifying the structure of the torsional damping mechanism, and improves the damping performance of the dynamic damper by enabling the turbine to be used as an inertial mass body.

[0017] In addition, the present invention is directed to providing a lock-up device for a torque converter, which can reduce manufacturing costs by omitting an intermediate member between an input member and an output member and simplifying the shape of a driven plate as an output member.

[0018] Technical Solution

[0019] In order to solve the above-mentioned problem, 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 the front housing through friction force; an output component, which is connected to the output hub to rotate as a whole and is arranged to be relatively rotatable relative to the input component; a first elastomer, which elastically connects the input component and the output component relative to the rotation direction; a dynamic damper, which is directly arranged on the output component, and the dynamic damper is arranged radially inward relative to the first elastomer.

[0020] The dynamic damper includes: an inertial mass body, which is rotatably arranged against the output component relative to the output component; and a second 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 second 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.

[0021] 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 second elastic body are arranged to overlap with the first elastic body as a whole relative to the rotation axis direction from the radial direction.

[0022] In addition, the dynamic damper further includes an additional mass body for increasing inertia, and the additional mass body is fixed on the first mass plate and is located further inward in the radial direction than the second elastic body.

[0023] The second mass plate includes a connection protrusion extending toward the turbine, and the second mass plate is connected to the turbine via the connection protrusion, so that the second mass plate rotates integrally with the turbine.

[0024] In addition, the locking device further comprises a connecting plate, which is used to connect the turbine and the second mass plate to rotate together, and the connecting plate is formed with a snap-fitting groove into which the connecting protrusion is inserted along the direction of the rotating shaft and then engaged.

[0025] In addition, the connection plate may be relatively rotatably supported by the output hub.

[0026] Effects of the Invention

[0027] According to the locking device for the torque converter of the present invention, the dynamic damper is arranged radially inward relative to the coil spring constituting the torsional damping mechanism, and the dynamic damper is directly arranged on the output component without the need for connecting components, so as to reduce the radial size of the torque converter, thereby achieving miniaturization.

[0028] In addition, according to the locking device for a torque converter of the present invention, the structure of the torsional damping mechanism is simplified to ensure the installation space of the additional inertial mass body on the radial inner side of the locking device, and the damping performance of the dynamic damper can be improved by enabling the turbine to be used as the inertial mass body.

[0029] Furthermore, according to the lock-up device for a torque converter of the present invention, the manufacturing cost can be reduced by omitting the intermediate member between the input member and the output member and simplifying the shape of the driven plate as the output member. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 2 yes Figure 1 A partial enlarged view of .

[0032] Figure 3 is with Figure 1 A cross-sectional view of the torque converter in a direction perpendicular to the rotation axis is shown.

[0033] Figure 4 is a perspective view of a driven plate and a dynamic damper assembly of a locking device according to an embodiment of the present invention.

[0034] Figure 5 yes Figure 4 Exploded three-dimensional diagram.

[0035] Figure 6 1 is a perspective view for explaining a connection plate and an output hub of a locking device according to an embodiment of the present invention.

[0036] Figure 7 It is a schematic diagram used to explain the torque transmission process of the torque converter. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The term "and / or" may include a combination of a plurality of related items or any items among the plurality of related items.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] <Overall structure of torque converter>

[0047] 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.

[0048] 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 supported by an output hub 43 so as to be relatively rotatable, 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.

[0049] 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 .

[0050] The turbine 4 is arranged to face the pump impeller 3 in the fluid chamber. The turbine 4 includes a turbine shell 41 and a plurality of turbine blades 42 fixed to the turbine shell 41. As described below, the turbine 4 is arranged to function as an inertial mass body when the locking device 6 is working. For this purpose, the turbine shell 41 is supported by the output hub 43 so as to be relatively rotatable through the connecting plate 70 described later.

[0051] The output hub 43 can be connected to the input shaft (not shown) of the transmission so that the output of the locking device 6 can be transmitted to the transmission. In addition, the output hub 43 has a first flange portion 43a extending in the radial direction and a second flange portion 43b extending from the radially outer end of the first flange portion 43a and forming a step portion 43c with respect to the first flange portion 43a.

[0052] The step portion 43c between the first flange portion 43a and the second flange portion 43b contacts the inner peripheral end portion 72 of the connecting plate 70 described later, and acts as a bearing for rotatably supporting the connecting plate 70, and the output component of the locking device 6 described later is connected to the radially outer end portion of the second flange portion 43b.

[0053] 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 .

[0054] <Structure of locking device>

[0055] The function of the locking device 6 is to change the torque transmission path of the torque converter as required, such as Figure 1 The arrangement shown is in the space between the front housing 2 and the turbine 4 .

[0056] 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 damping mechanism D elastically connecting the driving plate 62 and the driven plate 63 as a damping mechanism, and a dynamic damper DD directly arranged on the driven plate 63 for improving the vibration attenuation performance.

[0057] piston

[0058] 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 .

[0059] To this end, the 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.

[0060] 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 a damping mechanism described later from falling off and effectively supporting them.

[0061] 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.

[0062] The support edge 61b, the inner circumferential surface shape of the piston 61 and the spring clamping protrusion 62c of the drive plate 62 described later can prevent the first coil spring 64 from falling off in the radial direction and the axis XX direction without adding additional components. The first coil spring 64 can be effectively supported by a relatively simple structure.

[0063] Driver board

[0064] 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 corresponding to the damping mechanism D.

[0065] 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 .

[0066] The drive plate 62 also includes a spring locking portion 62 b for transmitting input torque to a driven plate 63 described later via the first coil spring 64 , and a spring clamping protrusion 62 c for supporting the first spring 64 .

[0067] The spring locking portion 62b is a portion of the outer periphery of the annular 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 spring locking portions 62b are formed on the outer periphery of the main body portion 62a and are arranged between the ends of a plurality of first coil springs 64. The spring locking portions 62b support the ends of the first coil springs 64 in the rotation direction.

[0068] The spring 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 portion of the main body 62a and bending it in the direction of the rotation axis XX, and is arranged between the spring stopper portions 62b in the rotation direction. The spring 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.

[0069] As described above, the spring stopper 62b for transmitting torque and the spring clamping protrusion 62c for supporting the first coil spring 64 are formed by partially cutting or bending the main body 62a of the drive 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, so that the structure of the locking device 6 can be simplified, and the manufacturing cost can be significantly reduced compared with the past.

[0070] First elastic body-first coil spring 64

[0071] As the first elastic body constituting the damping mechanism, the first coil spring 64 elastically connects the driving plate 62 and the driven plate 63 described later in the rotation direction so as to absorb torsional vibration and transmit torque to the driven plate 63, and is supported by the supporting edge 61b of the piston 61, the spring clamping protrusion 62c of the driving plate 62 and the inner surface of the piston 61 in the XX direction of the rotating axis and in the radial direction.

[0072] In addition, the first coil spring 64 is supported by the spring 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.

[0073] On the other hand, Figure 2 As shown, an auxiliary coil spring 65 having the same function as the first coil spring 64 may be further provided inside the first coil spring 64. In the case where the damping function cannot be effectively ensured by only the first coil spring 64 according to the magnitude of the transmitted torque and vibration, an auxiliary coil spring 65 may be further provided. Although the present invention is not limited thereto, the following description will be based on an embodiment in which the first coil spring 64 further has an auxiliary coil spring 65 inside.

[0074] Follower Plate

[0075] The driven plate 63 is connected to the second flange portion 43b of the output hub 43 so as to rotate integrally with the output hub 43. The driven plate 63, as an output component, is arranged to be relatively rotatable relative to the piston 61 and the drive plate 66 so that the torque transmitted from the piston 61 and the drive plate 62, which are input components, via the first coil spring 64 and the auxiliary coil spring 65 can be ultimately transmitted to the output hub 43 without an intermediate connecting component.

[0076] Therefore, according to one embodiment of the present invention, the driven plate 63 of the locking device 6 is configured to directly receive torque from the piston 61 and the driving plate 62 as input components, so that the intermediate components can be omitted, and the shape of the driven plate currently having a double plate structure can be simplified into a single plate component, thereby reducing manufacturing costs.

[0077] The specific structure of the driven plate 63 is shown in detail in Figure 4 and Figure 5 middle.

[0078] Reference Figure 4 and Figure 5 The driven plate 63 is formed by stamping a single disc-shaped component, and has an annular plate body 63a with a center hole 63d formed inside. The output hub connecting portion 63f formed on the inner end 63e of the plate body 63a is firmly connected to the second flange portion 43b of the aforementioned output hub 43 by welding or the like.

[0079] An outer locking portion 63b, a first spring hole 63g and a stop hole 63h are formed on the 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 second 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.

[0080] The outer locking portion 63b is a portion of the outer periphery of the annular plate body 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 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.

[0081] 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 spring locking portion 62 b of the driving plate 62 in the rotation direction.

[0082] A plurality of first spring holes 63g are formed in the circumferential direction corresponding to the number of second coil springs 68 so as to accommodate the second coil springs 68 constituting the dynamic damper DD. The end surfaces on both sides of the first spring hole 63g are kept in contact with the second coil springs 68, thereby functioning as an inner locking portion 63c, and the elastic force of the second coil spring 68 acts on the inner locking portion 63c.

[0083] The stopper hole 63h is a portion through which the rivet R4 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.

[0084] Inertial mass

[0085] 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 a 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.

[0086] like Figure 4 and Figure 5 As shown, the first mass plate 66 and the second mass plate 67 are formed as plate-like annular members similar in shape to the plate body 63 a of the driven plate 63 and are respectively disposed against both side surfaces of the plate body 63 a of the driven plate 63 .

[0087] In addition, the first mass plate 66 and the second mass plate 67 are arranged on the inner side of the first coil spring 64 in the radial direction, and from the radial point of view, they are arranged to at least partially overlap with the first coil spring 64 relative to the direction of the rotation axis XX. Preferably, the first mass plate 66 and the second coil spring 68 described later are arranged to overlap with the first coil spring 64 as a whole relative to the direction of the rotation axis XX.

[0088] That is to say, the inertial mass body that is traditionally arranged as an integral body is split and arranged in the form of annular plates on both side surfaces of the driven plate 63 to minimize the space occupied by the inertial mass body, and is arranged radially inside relative to the first coil spring 64, rather than radially beyond the range of the first coil spring 64, thereby significantly reducing the radial size of the locking device 6.

[0089] Furthermore, from a radial perspective, the first mass plate 66 and the second mass plate 67 at least partially overlap with the first coil spring 64 relative to the rotation axis XX direction, thereby reducing the rotation axis XX direction dimension of the locking device 6 .

[0090] At this time, the first mass plate 66 and the second mass plate 67 are connected to each other by the rivet R4 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 R4 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 R4 extends through the stop hole 63h of the driven plate 63, so under the interaction of the rivet R4 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.

[0091] 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 second elastic body, preferably to the second coil spring 68, without an intermediate connection component.

[0092] 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 second coil spring 68. The second spring hole 66b and the third spring hole 67b have respective end surfaces in contact with both ends of the second coil spring 68 to function as spring stoppers 66d and 67d that press the two ends of the second coil spring 68 during the damping action.

[0093] 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 .

[0094] The second spring hole 66b and the third spring hole 67b can be formed by cutting and bending the parts of the respective plate bodies 66a, 67a corresponding to the first spring hole 63g of the driven plate 63, and the parts bent radially inward and outward serve as spring clamping protrusions 66e, 67e for supporting the second coil spring and preventing it from falling off.

[0095] Therefore, the first mass plate 66 and the second mass plate 67 are configured to be directly connected to the second coil spring 68. Unlike the prior art, no intermediate connecting component is required. In the absence of other spring retaining components, the spring clamping protrusions 66e and 67e have a retaining structure for the second coil spring 68, thereby simplifying the structure of the locking device 6 compared to the prior art and significantly reducing the manufacturing cost.

[0096] 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, the locking device according to an embodiment of the present invention may include an additional mass body 69 for increasing the inertia of the inertial mass body or may be configured to utilize the turbine 4 as the inertial mass body.

[0097] like Figure 4 and Figure 5 As shown, the additional mass body 69 may be formed in an annular shape and fixed to the first mass plate 66 by a rivet R3 at a position located radially inward of the second coil spring.

[0098] At this time, the additional mass body 69 is preferably arranged in the space between the first mass plate 66 and the inner side of the piston 61 to improve space utilization. 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 modified examples should also fall within the scope of the present invention.

[0099] On the other hand, as a device that can use the turbine 4 as an inertial mass body, the locking device 6 according to an embodiment of the present invention includes a connecting plate 70 for connecting the turbine housing 41 and the first mass plate 66 to each other so as to rotate integrally.

[0100] like Figure 7 As shown, the connecting plate 70 includes an annular disc portion 71 with a hole formed in the middle, and the disc portion 71 is fixed to the turbine housing 41 by rivets R2 at multiple locations.

[0101] In a state where the circular inner peripheral end portion 72 of the disk portion 71 is in contact with the step portion 43 c of the output hub 43 , the connection plate 70 is supported by the step portion 43 c of the output hub 43 so as to be relatively rotatable.

[0102] A plurality of engagement grooves 74 are formed in the circumferential direction on the outer peripheral end portion 73 of the disk portion 71 , and the connection protrusions 67 f of the second mass plate 67 are engaged with the engagement grooves 74 .

[0103] Therefore, when assembling the torque converter 1, as long as the assembly of the turbine 4 and the connecting plate 70 is inserted along the XX direction of the rotating shaft, the connecting protrusion 67f of the second mass plate 67 will be combined with the snap-fit ​​groove 74 of the connecting plate 70 to complete the combination between the connecting plate 70 and the second mass plate 67, so the overall assembly process of the torque converter 1 can be simplified.

[0104] On the other hand, the embodiment in the accompanying drawings shows that a connecting protrusion 67f is formed on the second mass plate 67 in the direction of the rotation axis XX and a snap-fit ​​groove 74 is formed on the connecting plate 70, but the present invention is not limited to this. It can be arranged that a snap-fit ​​groove is formed on the second mass plate 67 and a connecting protrusion extending along the direction of the rotation axis XX is formed on the connecting plate 70. Such a modified example should also fall within the scope of the present invention.

[0105] The third elastic body

[0106] The second coil spring 68, which serves as a second 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 inner locking portion 63c 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.

[0107] Therefore, when the driven plate 63 rotates relative to the inertial mass body including the first mass plate 66, the second mass plate 67, the additional mass body 69, and the turbine 4, the second coil spring 68 is compressed in the rotation direction, thereby applying a vibration with a phase opposite to the vibration input to the driven plate 63 to the driven plate 63, and the torque in the vibration attenuation state is finally transmitted to the output hub 43.

[0108] <Working of Torque Converter>

[0109] Refer to the following Figure 7 The operation of the torque converter 1 having the locking device 6 according to the present invention will be described.

[0110] When the front housing 2 and the pump impeller 3 rotate, the hydraulic oil flows from the pump impeller 3 to the turbine 4, and the 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) through the first mass plate 66, the second mass plate 67 and the driven plate 63 through the output hub 43.

[0111] 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.

[0112] 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 .

[0113] When power is transmitted to the driving plate 62 , the first coil spring 64 is first compressed in the rotation direction between the spring stopper 62 b of the driving plate 62 and the outer stopper 63 b of the driven plate 63 , and then the power with torsional vibration attenuation is transmitted to the driven plate 63 .

[0114] On the other hand, when power is transmitted to the driven plate 63, the second coil spring 68 is compressed in the rotation direction between the inner locking portion 63d of the driven plate 63 and the spring locking portions 66d and 67d of the first mass plate 66 and the second mass plate 67, and thus the vibration of the dynamic damper DD having a phase opposite to the vibration input to the driven plate 63 is transmitted to the driven plate 63 through the second coil spring 68.

[0115] As a result, the vibration-damped power is ultimately transmitted to the output hub 43 via the driven plate 63 .

[0116] 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.

[0117] 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.

[0118] Explanation of symbols

[0119] 1: Torque converter 2: Front housing

[0120] 3: Pump wheel 4: Turbine

[0121] 5: Stator 6: Locking device

[0122] 61: Piston 62: Drive plate

[0123] 63: driven plate 64: first coil spring

[0124] 65: Auxiliary coil spring 66: First mass plate

[0125] 67: Second mass plate 68: Second coil spring

[0126] 69: Additional mass D: Damping mechanism

[0127] DD: Dynamic Damper

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 output hub for integral rotation and arranged to be relatively rotatable relative to the input member; a first elastic body elastically connecting the input component and the output component relative 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 second elastic body, the inertial mass body is relatively rotatable relative to the output component and is arranged against the output component, the second elastic body elastically connects the inertial mass body and the output component relative to the rotation direction, and 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; an additional mass body, fixed on the first mass plate and located radially inward of the second elastic body, The second mass plate is connected to the turbine through a connecting plate, so that the second mass plate rotates integrally with the turbine, and the connecting plate can rotate relative to the output hub, and Wherein, the dynamic damper is arranged radially inward relative to the first elastic body.

2. The locking device for a torque converter according to claim 1, wherein: The inertial mass body and the second 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.

3. The locking device for a torque converter according to claim 2, wherein: The first mass plate and the second elastic body are arranged to entirely overlap with the first elastic body with respect to the rotation axis direction when viewed from the radial direction.

4. The locking device for a torque converter according to claim 3, wherein: The second mass plate includes a connecting protrusion extending toward the turbine, The second mass plate is connected to the turbine through the connection protrusion, so that the second mass plate rotates integrally with the turbine.

5. The locking device for a torque converter according to claim 4, further comprising: The connecting plate is formed with a snap-fitting groove into which the connecting protrusion is inserted and coupled along the rotation axis direction.

6. The locking device for a torque converter according to claim 5, wherein: The connection plate is supported by the output hub so as to be relatively rotatable.

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