JP2010230155A - Lock-up damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock-up damper device housed in a torque converter in a structure of a two-divided power transmission passage. <P>SOLUTION: In the lock-up damper device, a plurality of damper springs 8a, 8a..., 8b, 8b... are arranged at an outer circumference side and an inner circumference side of which the radii are different, an auxiliary damper spring 10 that works when the relative twist angle between an outer plate 14 that is an input side member and a center disc 15 that is an output side member exceeds a predetermined range is attached to the outer circumference of the outer plate 14, a disc 38 is fixed at the outer circumference of a turbine runner 2, and a spring presser 39 compressed by being brought contact with the auxiliary damper spring 10 is protruded to the disc outer circumference. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lockup damper device capable of reducing impact torque and torque fluctuation in a torque converter.

  As is well known, a torque converter is a kind of joint that can transmit engine power to a transmission using a working fluid as a medium. A pump impeller that is turned by the engine and a movement of the working fluid that is sent out by the rotation of the pump impeller. The turbine runner that rotates around the turbine runner, and the stator that changes the direction of the working fluid from the turbine runner and guides it to the pump impeller.

  FIG. 12 shows a cross section of a conventional torque converter. In the figure, (a) shows a pump impeller, (b) shows a turbine runner, (c) shows a stator, and (d) shows a lock-up damper device, which are housed in an outer shell (e). Therefore, the front cover (f) rotates with the power from the engine, and the pump impeller (a) integrated with the front cover (f) rotates. As a result, the turbine runner (rotor ) Turns.

  A shaft (not shown) is fitted to the turbine hub (g) of the turbine runner (b), and the rotation of the turbine runner (b) can be transmitted to a transmission (not shown). Since the torque converter is a kind of fluid coupling, the turbine runner (B) starts to rotate as the rotational speed of the pump impeller (A) increases, and the speed of the turbine runner (B) increases as the speed increases. A) approaches the rotation speed. However, in the torque converter using the working fluid as a medium, the rotational speed of the turbine runner (b) cannot be the same as that of the pump impeller (b).

  Therefore, as shown in the figure, when the lockup damper device (d) is provided and the rotational speed of the turbine runner (b) exceeds a predetermined range, the lockup damper device (d) The piston (h) moves in the axial direction and engages with the front cover (f). Since a friction material (re) is attached to the outer periphery of the piston, the piston (h) can rotate at the same speed as the front cover (f) without slipping. Since the lock-up damper device (d) is connected to the turbine runner (b), the turbine runner (b) is directly rotated by the front cover (f), and the power from the engine is transmitted to the transmission. It can be transmitted with high efficiency of almost 100% without any loss due to the fluid.

  In this way, when the rotational speed of the turbine runner (b) increases and a certain condition is reached, the piston (h) engages with the front cover (f), but before the engagement, the turbine runner (b) ) And the front cover (f) are not completely the same in rotational speed, and the impact torque based on the speed difference is generated when the piston (h) engages with the front cover (f). Damper springs (N) and (N) between the front cover (F) and the turbine runner (B) in order to reduce the impact torque at the time of engagement and not transmit the engine torque fluctuation after engagement. .. A lock-up damper device (d) equipped with is attached.

  Therefore, when the piston (chi) rotating at the same speed as the turbine runner (b) is engaged with the slightly faster front cover (f), the speed of the piston (chi) increases momentarily and the turbine runner ( B) Torque to rotate faster is applied. The damper springs (nu), (nu),... Are configured to absorb and absorb this shocking torque.

  Conventionally, various structures of lock-up damper devices are known. For example, a “damper mechanism” according to Japanese Patent Laid-Open No. 10-169714 is connected in series via an intermediate member to ensure a wide torsion angle characteristic. It is a damper mechanism in which a plurality of elastic members (damper springs) are arranged on the outer peripheral portion, and is intended to regulate the movement of the connecting portion of the elastic member including the intermediate member and stabilize the damper characteristics.

  Therefore, the lockup damper mechanism includes a retaining plate, a driven member, a coil spring arranged in series in the outer peripheral portion, an intermediate member, and a pressing plate that restricts the axial movement of the intermediate member. Yes. The coil spring elastically connects the retaining plate and the driven member. In this case, the intermediate member is rotatable relative to the retaining plate and the driven member, and an intermediate support portion disposed between the coil springs and an annular coupling portion that restricts the movement of the intermediate support portion in the radial direction outside. And have.

  FIG. 13 shows a specific example of a conventional lock-up damper device (d). The lock-up damper device (d) includes an input side central disk (wa), output side plates (le), (le), and a plurality of them. The damper spring (nu), (nu) ..., and the intermediate member (la). The central disk (wa) is sandwiched between both plates (le) and (le), and the damper is placed in the spring accommodating space (ta), (ta),... Formed in each plate (le) and (le). Spring (nu), (nu) ... are housed.

  And two damper springs (nu), (nu) are accommodated in one spring accommodating space (ta) curved in an arc shape, and the intermediate member is interposed between both damper springs (nu), (nu). A separator (n) protruding from the outer periphery of (la) is interposed to connect two damper springs (nu) and (nu) in series. Here, the central disk (wa) and the intermediate member (ra) sandwiched between both plates (le) and (le) are capable of relative rotation.

  The central disk (wa) is generally ring-shaped, and has spring retainers (yo), (yo),... Two damper springs (nu) and (nu) are accommodated in a spring accommodating space (ta), and both ends thereof are sandwiched between the spring retainers (yo) and (yo). Further, auxiliary damper springs (ne), (ne),... Having a high spring constant are attached to the outer peripheral portion of the central disk (wa).

  By the way, the inner peripheral side of the plate (le) is fixed to the turbine hub (g) together with the turbine runner (b), and is formed on the outer periphery of the central disk (wa). Is engaged with the outer periphery of the piston. Therefore, the lock-up damper device (d) rotating together with the turbine runner (b) is moved to the front cover (f) rotating at a higher speed by operating the piston (h) when the predetermined rotational speed is reached. If engaged, the damper springs (nu), (nu),... Are compressed and deformed by the impact torque based on the speed difference between the two. At this time, the damper springs (nu) and (nu) are uniformly compressed and deformed by rotating the intermediate member (la) along with the compression deformation of the damper springs (nu) and (nu). Is done.

  Thus, the torque converter incorporating the lock-up damper device (d) reduces the impact torque when the piston (h) engages with the front cover (f) and absorbs engine torque fluctuations in the engaged state. I can do it. However, when the impact torque at the time of piston engagement is very large, the energy associated with the impact torque cannot be absorbed only by the damper springs (nu), (nu). For this purpose, auxiliary damper springs (ne), (ne),... Are attached to the lock-up damper device (d).

  The above-mentioned auxiliary damper springs (ne), (ne),... With high spring constants are fitted into slots formed in the outer periphery of the output side central disk (wa), and the damper springs (nu), (nu),. Then, when the torsional rotation between the input side central disk (wa) and the output side plates (le) and (le) exceeds a predetermined angle, it can be compressed and deformed to receive impact torque.

  As is apparent from the torque converter shown in FIG. 12, the inner peripheral portion of the output plate (le) is connected and fixed to the turbine hub (g) together with the turbine runner (b) by rivets. Therefore, the spring force accompanying the compression deformation of the damper springs (nu), (nu), and the spring force accompanying the compression deformation of the auxiliary damper springs (ne), (ne) ... are all on one plate (le). Concentrate on the inner periphery.

"Damper device and fluid transmission device" according to Japanese Patent Application Laid-Open No. 2004-270808
The purpose is to improve durability.
That is, the damper device is configured such that power (torque) from the input member is transmitted to the output member in a state of being distributed between the first power transmission path and the second power transmission path. Accordingly, it is possible to reduce the stress applied to each member and to reliably prevent the stress from concentrating on a specific part such as the periphery of the fixed portion of the transmission member with the output member, thereby improving its durability. It becomes possible.

Although the auxiliary damper spring constituting the second power transmission path is attached to the outer periphery of the lockup damper device, the mounting structure is complicated. That is, a large disc-shaped damper hub is attached to the outer periphery of the lockup damper device, and a turbine plate is attached to the turbine runner, and the weight thereof is also increased. In addition, by attaching a damper hub to the outer periphery, a certain amount of space is formed in the outer peripheral portion, and for this purpose, the position of the damper spring is provided on the inner peripheral side.
"Damper mechanism" according to JP-A-10-169714 “Damper Device and Fluid Transmission Device” according to Japanese Patent Application Laid-Open No. 2004-270808

  As described above, the lockup damper device incorporated in the conventional torque converter has the above-described problems. The problems to be solved by the present invention are these problems. By dividing the output part into two parts, the load is evenly distributed without concentrating the load in one place, and the lock structure in which the mounting structure of the auxiliary damper spring is simplified. An up-damper device is provided.

  The torque converter lock-up damper device to which the present invention is applied has two power transmission paths, and the torque transmitted via the main damper spring is transmitted to the turbine hub and via the auxiliary damper spring. The torque is transmitted to the outer periphery of the turbine runner. Here, the damper spring is interposed between the input side member and the output side member, the outer periphery of the input side member is connected to the piston, and the inner periphery of the output side member is fixed to the turbine hub together with the turbine runner. .

  The auxiliary damper spring is attached to the outer peripheral portion of the input side member, and a spring retainer is provided on the outer periphery of the turbine runner so as to compress and deform when the twist angle between the input side member and the output side member exceeds a predetermined region. A disk formed on the outer periphery is fixed. A holding metal fitting for attaching an auxiliary damper spring is provided on the outer peripheral portion of the input side member. Conversely, the auxiliary damper spring can be attached to the outer peripheral portion of the turbine runner. In this case, the auxiliary damper spring is attached to the outer peripheral portion of the turbine runner and the auxiliary damper spring is attached. The disc on which the presser foot is formed is fixed. By the way, in this invention, the specific structure of a lockup damper apparatus is not limited.

  The lock-up damper device of the present invention has two power transmission paths, and torque transmitted through the damper spring is transmitted from the output side member to the turbine hub. On the other hand, when the amount of compressive deformation of the damper spring exceeds a predetermined region due to a large impact torque when the piston engages with the front cover and the auxiliary damper spring is compressed and deformed, the torque accompanying the spring force of the auxiliary damper spring is It is transmitted to the outer periphery of the runner.

  That is, since the torque accompanying the compression of the damper spring and the transmission path are separated, the load is not concentrated on the output side member of the lock-up damper device and is not damaged. Further, even when the damper springs are arranged in parallel on the inner diameter side and the outer diameter side, the holding metal fitting can be fixed to the outer periphery of the input side member, and the auxiliary damper spring is attached to the holding metal fitting. Can be fitted and installed. And this holding | maintenance metal fitting is a component independent of a lockup damper apparatus, can be attached freely as needed, and also exchange of an auxiliary damper spring is possible, and also the number of auxiliary damper springs can be changed. .

  On the other hand, by arranging the damper springs on different radii, the load based on the compression deformation of the damper springs can be evenly distributed, so that excessive stress is not generated in the spring accommodating space and the spring presser for accommodating the damper springs. And if the damper spring is greatly compressed and the torsion angle of the input side and the output side exceeds the predetermined region, the auxiliary damper spring works, but because it can be attached to the outer periphery of the input side member via the holding bracket, It does not interfere with the inner and outer damper springs arranged in parallel.

An embodiment showing a torque converter provided with a lockup damper device according to the present invention. FIG. 3 is a structural diagram showing the principle of the lockup damper device of the present invention. Relationship between torsion angle and torque associated with compression deformation of damper spring. An embodiment of a lockup damper device. The example of the outer plate which is an input side member. A specific example of an intermediate member. A specific example of a plate constituting the central disk. A state in which an intermediate member is incorporated in the central disk. Holding bracket for attaching the auxiliary damper spring to the outer periphery of the outer plate. Disc attached to turbine runner. The front view of a lockup damper apparatus, and the longitudinal cross-sectional view connected with the turbine runner. Conventional torque converter. Conventional lock-up damper.

  FIG. 1 is an embodiment showing a torque converter provided with a lockup damper device according to the present invention. In the figure, 1 is a pump impeller, 2 is a turbine runner, 3 is a stator, 4 is a lock-up damper device, 5 is an outer shell, 6 is a piston, and 7 is a front cover. The basic structure and basic operation of the torque converter are the same as those of the conventional torque converter, and the present invention is characterized by the structure of the lockup damper device.

  FIG. 2 is a conceptual diagram of the lock-up damper device of the torque converter shown in FIG. As shown in the figure, between the input side connected to the piston 6 and the output side connected to the turbine runner 2, a plurality of damper springs 8a, 8a, 8b, 8b. A large impact torque is generated by engaging with the cover 7, and the damper springs 8a, 8a, 8b, 8b,... Can be compressed and deformed in order to reduce the impact torque.

  In the figure, two damper springs 8a, 8a in parallel are combined into one set and connected via a separator 9, and a total of four damper springs 8a, 8a,. The two sets of damper springs 8a, 8a,..., 8b, 8b,... Connected via the separator 9 are provided on the inner peripheral side and the outer peripheral side. Accordingly, a total of eight damper springs 8a, 8a,..., 8b, 8b,.

  The damper springs 8a, 8a,..., 8b, 8b,... That are arranged in series via the separator 9 can be twisted between the input side and the output side (in the case of FIG. The damper springs 8a, 8a,..., 8b, 8b,. In the lock-up damper device according to the present invention, the impact torque generated when the piston 6 is engaged with the front cover 7 is alleviated by the compression deformation of the eight damper springs 8a, 8a,. The At the same time, in the locked-up state, the engine torque fluctuation is absorbed by the compression deformation of the damper springs 8a, 8a,.

  In addition to the damper springs 8a, 8a,.., 8b, 8b,..., An auxiliary damper spring 10 having a high spring constant is attached to the input side, and the damper springs 8a, 8a,. If the torsional angle between the input side and the output side becomes large due to a large compression deformation, the auxiliary damper spring 10 comes into contact with a contact member 11 provided on the output side and is compressed. Further, stoppers 12 and 13 are provided on the input side and the output side. If the auxiliary damper spring 10 is compressed to the limit, the stoppers 12 and 13 come into contact with each other. Therefore, no further twisting occurs. The provision of the auxiliary damper spring 10 and the provision of the stoppers 12 and 13 are common to the conventional lock-up damper device, but the damper springs 8a, 8a,. It is one of the features of the present invention that they are arranged on the inner peripheral side.

FIG. 3 shows the relationship between the torsional angle and the torque associated with the compression deformation of the damper springs 8a, 8a..., 8b, 8b. When the piston 6 is engaged with the front cover 7, an impact torque is generated, and the damper springs 8a, 8a,..., 8b, 8b,. Within this angle of twist theta _1, damper springs 8a, 8a ··, 8b, only 8b · · is compressed and deformed.

  Of course, in this case, the damper springs 8b, 8b ... provided on the inner peripheral side and the damper springs 8a, 8a ... provided on the outer peripheral side are both compressed and deformed, but the magnitude of the torque to be borne may be different from each other. . That is, damper springs having different dimensions may be used, and the amount of compressive deformation for the same torsion angle differs between the inner peripheral side and the outer peripheral side. For example, by setting the load distribution on the outer peripheral side and the inner peripheral side to about 3: 7, it is possible to equalize the load of the transmission torque generated with respect to the input side and output side torsion. However, it is ideal that the load accompanying the compressive deformation of the damper springs 8a, 8a,..., 8b, 8b .. is equalized between the outer peripheral side and the inner peripheral side. The torque generated in the is different.

  FIG. 4 is a specific example showing a lockup damper device according to the present invention. In the figure, 14 represents an outer plate, 15 represents a central disk, and 16 represents an intermediate member. The outer plates 14 and 14 sandwich the central disk 15, and the central disk 15 is composed of two plates 17 and 17 overlapped. is doing. The central disk 15 constituted by the two plates 17 and 17 sandwiches the intermediate member 16 therebetween.

  The outer plates 14, 14 are provided with outer peripheral spring accommodating portions 18, 18... And inner peripheral spring accommodating portions 19, 19. The damper springs 8a, 8a,... Are accommodated in the outer periphery spring accommodation space 20 formed by the outer circumference spring accommodating portions 18, 18,. On the other hand, the damper springs 8b, 8b,... Are accommodated in the inner peripheral spring accommodating space 21 formed by the inner peripheral spring accommodating portions 19, 19,. By arranging the damper springs 8a, 8a,..., 8b, 8b .. through the separators 9, 9,... On the outer peripheral side and the inner peripheral side as described above, a large impact torque can be reduced. Thus, a sufficient twist angle between the input side and the output side can be secured.

  Here, two damper springs 8a and 8a are arranged in series in one outer peripheral spring accommodating space 20 curved in an arc shape, and a separator 9a of the intermediate member 16 is interposed between the damper springs 8a and 8a. is doing. The damper springs 8a and 8a have a double structure in which another small-diameter spring is fitted in the hole of the large-diameter spring, but the invention is not necessarily limited to the double structure. Similarly, the damper spring 8b has a double structure in which another small-diameter spring is fitted in the hole of the large-diameter spring.

  As shown in FIG. 5, the outer peripheral spring accommodating spaces 20, 20... Are formed at three locations, and the inner peripheral spring accommodating spaces 21, 21. The outer peripheral spring accommodating spaces 20, 20,... And the inner peripheral spring accommodating spaces 21, 21,... Are provided on a predetermined radius from the center. On the outer periphery, there are provided engaging grooves 22, 22 ... for engaging the piston 6, and a plurality of rivet holes 23, 23 ... for fitting rivets in order to combine the outer plates 14, 14. Yes. Further, stoppers 12, 12,.

  FIG. 6 is a specific example showing the intermediate member 16. The intermediate member 16 has outer peripheral separators 9a, 9a,... Projected at three locations on the outer peripheral side of the ring 24, and inner peripheral separators 9b, 9b,. And the outer peripheral separators 9a, 9a,. 9b is provided at the same position on the ring 24.

  FIG. 7 is a specific example showing the plate 17 constituting the central disk 15. The plate 17 has a substantially disk shape, has a ring 28 concentric with the central disk 27, and protrudes outer peripheral spring retainers 29, 29,... The ring 28 and the central disk 27 are connected by inner spring retainers 30, 30,... And outer spring spaces 31, 31,... Are formed between the outer spring retainers 29, 29,. Inner peripheral spring spaces 32, 32,... Are formed between the inner peripheral spring retainers 30, 30,. Further, the central disk 27 is provided with rivet holes 34, 34,... For fixing to the turbine hub 33, and stoppers 13, 13,.

  FIG. 8 shows a state in which the intermediate member 16 is incorporated in the central disk 15, and the intermediate member 16 is sandwiched between plates 17 and 17. As shown in FIG. 7, the ring of the plate 17 is not flush with the outer peripheral spring retainer 29, the inner peripheral spring retainer 30, and the central disk 27, but bulges outward. Therefore, a groove 35 is formed on the inner side. For this purpose, the ring 24 of the intermediate member 16 is fitted in a space 36 formed by the grooves 35, 35 on the central disk 15 formed by overlapping two sheets. However, the ring 24 is fitted so that it can rotate in the space 36.

  By the way, the pump impeller 1 rotates, and at the same time, the turbine runner 2 rotates following the pump impeller 1, and the lockup damper device 4 attached to the turbine hub 33 together with the turbine runner 2 also rotates at the same speed. Then, when the rotational speed of the turbine runner 2 exceeds a predetermined region, the piston 6 operates and engages with the front cover 7, and the output shaft fitted in the shaft hole of the turbine hub 33 rotates directly by the piston 6. Driven.

  The impact torque generated when the piston 6 is engaged with the front cover 7 is alleviated by the compression deformation of the damper springs 8a, 8a,... And the damper springs 8b, 8b,. In a later lock-up state, engine torque fluctuations are absorbed by the damper springs 8a, 8a,... And the damper springs 8b, 8b,.

  Reducing the impact torque when the piston is engaged and absorbing engine torque fluctuations in the lock-up state are the same as in the conventional lock-up damper device 4, but the lock-up damper device shown in this embodiment has an outer periphery. The damper springs 8a, 8a,... And the damper springs 8b, 8b,. Two damper springs 8a, 8a connected in series via the outer peripheral separator 9a of the intermediate member 16 are attached to three locations on the outer peripheral side, and are attached to three locations. Two damper springs 8b and 8b connected in series via a separator 9b are attached to three places as a set.

  The lock-up damper device 4 shown in this embodiment has a large impact torque without increasing the spring constant by attaching damper springs 8a, 8a,. Can be relaxed. In addition, since the spring constant is not large, relatively small torque fluctuations can be absorbed. Then, the damper springs 8a, 8a,.., 8b, 8b,... Are arranged over almost the entire area of the lockup damper device, so that the damper springs 8a, 8a,. The local spring does not work due to the spring force based on it.

On the other hand, if each of these damper springs 8a, 8a, 8b, 8b,... The auxiliary damper spring 10 can work when the relative twist angle between the outer plate 14 serving as the input side member and the central disk 15 serving as the output side member exceeds a certain region. As shown in FIGS. It is attached to the outer periphery.
The lock-up damper device 4 of the present invention has a structure in which the power transmission path is separated into two, and the spring force accompanying the compression deformation of the auxiliary damper springs 10, 10... From the outer peripheral portion of the outer plate 14 that is an input side member. It is structured to be transmitted to the turbine runner 2.

  FIG. 9 shows a holding metal fitting 37 for attaching the auxiliary damper spring 10, and FIG. 4 shows a case where the auxiliary damper spring 10 is attached to the outer periphery of the outer plate 14 via the holding metal fitting 37. FIG. 10 shows a disk 38 fixed to the turbine runner 2. The disk 38 is an output side member, and the damper springs 8a, 8a,.., 8b, 8b,... Are greatly compressed and deformed and the relative torsion angle generated between them and the outer plate 14 exceeds a predetermined region. The auxiliary damper spring 10 works to absorb a part of the impact torque. That is, the spring presser 39 provided protruding from the outer periphery of the disk contacts the auxiliary damper spring 10 and is compressed and deformed.

  Further, in the case of a large impact torque that cannot be absorbed even when the auxiliary damper spring 10 is operated, the stoppers 12 and 13 are finally operated to prevent further twisting rotation of the input side member and the output side member. In the case of this embodiment, one stopper 12 is provided on the inner peripheral side of the outer plate 14, and the other stopper 13 is provided on the inner peripheral side of the plate 17 constituting the central disk 15.

  FIG. 11 shows a front view (including a partial cross section) of the lockup damper device 4 with the piston 6 removed, and a longitudinal sectional view of the turbine runner 2 and the lockup damper device 4. The spring retainer 39 provided on the outer periphery of the disk is shown in a partial cross section of the front view. The spring retainer 39 and the stopper 13 formed on the plate 17 constituting the central disk 15 are aligned and assembled. That is, when the spring retainer 39 compresses the auxiliary damper spring 10 and exceeds the limit, the stoppers 12 and 13 can come into contact with each other to prevent torsional rotation.

  The lock-up damper device of the present invention has a structure in which the power transmission path is divided into two, and the torque transmitted through the damper springs 8a, 8a,..., 8b, 8b,. It is transmitted to. As the amount of compressive deformation of the damper springs 8a, 8a,..., 8b, 8b .. increases, the transmission torque also increases, and the load on the inner peripheral side of the central disk 15 increases.

  However, the amount of compressive deformation of the damper springs 8a, 8a,..., 8b, 8b,... Exceeds the limit and the auxiliary damper springs 10, 10,. The spring force accompanying the deformation is not transmitted to the central disk 15. Torque associated with this spring force is transmitted to a disk 38 fixed to the outer periphery of the turbine runner 2, transmitted from the disk 38 to the turbine runner 2, and enters the turbine hub 33, but the power transmission path based on each spring force is different. ing. Therefore, the burden on the central disk 15 that is the output side member is reduced, and the durability of the lockup damper device 4 is improved.

  The auxiliary damper springs 10, 10,... Are fixed to the outer peripheral portion of the outer plate 14, which is an input side member, via holding fittings 37, 37,. Here, the holding metal fitting 37 is a component independent of the lock-up damper device 4, and a holding metal fitting provided with a spring accommodating space that matches the length and outer diameter of the auxiliary damper spring 10 can be used. Therefore, the auxiliary damper spring 10 having different spring characteristics can be changed later in consideration of the balance with the damper spring 8 accommodated in the lockup damper device main body.

  By the way, in the lockup damper device of the embodiment, the damper springs 8a, 8a,... Are arranged in parallel on the outer peripheral side, and the damper springs 8b, 8b,. In some cases, the springs 8, 8,. It is also possible to arrange the damper springs 8a, 8a ... on the outer peripheral side and the damper springs 8b, 8b ... on the inner peripheral side in series. In the present invention, the structure of the lockup damper device main body is not limited.

DESCRIPTION OF SYMBOLS 1 Pump impeller 2 Turbine runner 3 Stator 4 Lock-up damper device 5 Outer shell 6 Piston 7 Front cover 8 Damper spring 9 Separator
10 Auxiliary damper spring
11 Contact member
12 Stopper
13 Stopper
14 Outer plate
15 Central disk
16 Intermediate member
17 plates
18 Peripheral spring housing
19 Inner spring housing
20 Outer spring housing space
21 Inner spring housing space
22 Engagement groove
23 Rivet holes
24 rings
27 Central disc
28 rings
29 Peripheral spring retainer
30 Inner spring retainer
31 Outer spring space
32 Inner spring space
33 Turbine hub
34 Rivet hole
35 groove
36 space
37 Retaining bracket
38 discs
39 Spring presser

Claims (4)

In a lock-up damper device that is housed in a torque converter and reduces impact torque when the piston engages with the front cover, and absorbs torque fluctuations of the engine in the lock-up state where the piston engages with the front cover. A plurality of damper springs are interposed between the input side member connected to the piston and the output side member attached to the turbine hub together with the turbine runner to elastically connect the input side member and the output side member, An auxiliary damper spring having a higher spring constant than that of the damper spring is fitted into a holding bracket attached to the outer periphery of the input side member, a disk is fixed to the outer periphery of the turbine runner, and the torsional rotation angle between the input side member and the output side member is If the specified area is exceeded, the spring presser protruding to the disk will come into contact with the tip of the auxiliary damper spring. Lockup damper device of the torque converter, characterized by being configured to. In a lock-up damper device that is housed in a torque converter and reduces impact torque when the piston engages with the front cover, and absorbs torque fluctuations of the engine in the lock-up state where the piston engages with the front cover. The lockup damper device has a plurality of damper springs arranged on the outer peripheral side and the inner peripheral side with different radii, and according to the relative torsion angle between the input side member connected to the piston and the output side member connected to the turbine runner. These damper springs are connected in series as a set of two damper springs, and a separator formed on an intermediate member that is rotatably supported is interposed between the damper springs. Auxiliary damper springs that work when the relative twist angle between the side members exceeds the specified range are attached to the outer periphery of the input side member. When a disk is fixed on the outer periphery of the turbine runner, a spring presser that protrudes against the auxiliary damper spring is projected on the outer periphery of the turbine runner, and when the relative twist angle between the input side member and the output side member exceeds the limit region. A lock-up damper device for a torque converter, comprising a stopper for preventing relative torsion. The holding metal fitting for attaching the auxiliary damper spring is attached to the outer peripheral portion of the turbine runner, and a disk formed with a spring presser that is compressed and deformed against the auxiliary damper spring is fixed to the outer peripheral portion of the input side member. The lock-up damper device for the torque converter described. By making the input torque of the damper spring arranged on the inner circumference side smaller than the input torque of the damper spring arranged on the outer circumference side, the input load of the damper spring on the outer circumference side and the inner circumference side was made almost equal. 4. A lockup damper device for a torque converter according to claim 2 or claim 3.

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