JP6346414B2 - Lock-up device - Google Patents

Description

  The present invention relates to a lockup device for a fluid transmission device (so-called torque converter) interposed between, for example, a crankshaft of an engine and an input shaft of a transmission.

  In a torque converter incorporated in an automatic transmission for a vehicle, a front cover that constitutes a front portion of the converter housing is rotationally driven by a crankshaft, and further, between a wing on the pump impeller side of the converter housing and a wing on the turbine runner side Thus, torque is transmitted from the output shaft driven by the turbine runner to the input shaft of the input shaft transmission of the transmission. Further, the torque converter has a lock-up device for directly transmitting the torque of the crankshaft of the engine to the transmission in order to improve fuel consumption.

  In the lockup device, the front cover of the converter housing and the output shaft are connected by a clutch driven by fluid pressure (hydraulic pressure), whereby the torque of the crankshaft of the engine is directly transmitted to the input shaft of the transmission. . Such a lock-up device includes a torsional vibration reduction mechanism (damper) interposed between the clutch and the output shaft, and absorbs and attenuates torsional vibration.

  For example, a lock-up clutch (lock-up device) disclosed in Patent Document 1 includes at least a lock-up piston that is in sliding contact with a front cover via a clutch facing, an input-side rotating member that is rivet-fastened to the lock-up piston, An output-side rotating member riveted to a turbine hub for transmitting power to an output shaft connected to an input shaft of the transmission, and a damper mechanism (buffer mechanism) interposed between the input-side rotating member and the output-side rotating member ). The turbine runner is riveted to the turbine hub together with the output side rotating member.

  Such lockup of the lockup clutch is performed by moving the lockup piston to the front cover side by hydraulic pressure and slidingly contacting the sliding member of the front cover, and releasing the lockup by hydraulic pressure. This is done by separating the cover sliding member. When the lockup is released, the torque converter transmits torque from the pump impeller to the turbine runner.

  Further, as shown in FIG. 5, the lockup device 2 is connected to the lockup piston 21 slidably in contact with the inner surface 11 b of the front cover 11 through the clutch facing 15, and the input side on which the side plate 23 x and the drive plate 23 y are fixed by rivets 24. A rotating member, a buffer mechanism 25, a turbine hub 27 for transmitting torque transmitted from the pump impeller 12 to the turbine runner 13 to the output shaft 3, and a hub clutch 26 fixed to the turbine hub 27 with rivets 28. Can also be configured.

JP 2012-211707 A

  In the lock-up device, in order to achieve a good lock-up, it is desirable to make the surface pressure distribution of the hydraulic pressure applied to the sliding portion of the lock-up piston (hereinafter, sometimes referred to as a hydraulic distribution) as uniform as possible. In order to improve durability, the heat capacity of the sliding part of the lock-up piston and its adjacent part (hereinafter referred to as the sliding part) may be increased to reduce the temperature rise of the sliding part. desired.

  For this purpose, the lockup piston must be thickened. However, in the conventional lockup device shown in Patent Document 1 and FIG. 5, when the lockup piston is thickened, its weight and moment of inertia increase. Therefore, it becomes a problem to increase the heat capacity of the sliding portion without increasing the weight.

  The conventional lockup device shown in Patent Document 1 and FIG. 5 includes a torque conversion unit including a pump impeller and a turbine runner, a lockup piston, an input side rotation member, an output side rotation member, a buffer mechanism, and the like. The lockup device is attached by fastening (rivet fastening) between the turbine hub and the output side rotating member (hub clutch). Also on the lockup device side, the lockup piston and the input side rotating member are fastened (the lockup device of Patent Document 1), or the side plate 23x and the drive plate 23y are fastened (conventional technology shown in FIG. 5). Lock-up device). However, since the fastening portion between the turbine hub and the output side rotating member is covered with the lockup piston, the assembly of the lockup device, the coupling process to the torque conversion unit, and the like become complicated.

  In addition, the lockup device that rotates at high speed reduces the number of components (number of parts) as much as possible, thereby reducing weight and moment of inertia and improving fuel economy, as well as material costs, manufacturing costs, and material management. Cost reduction is desired. For example, in the conventional lock-up device shown in FIG. 5, the input side rotation member is composed of two parts, that is, the side plate 23x and the drive plate 23y, and the reduction of the number of parts becomes an issue.

  With the diversification of specifications of vehicles and the like, the torque converter may require a change in the sliding portion of the lockup piston. However, in the conventional lockup device shown in Patent Document 1 and FIG. Changes are required. Therefore, it is an issue to realize a lock-up device that can flexibly cope with diversified specifications with as little change as possible to diversified specifications, that is, with one basic design.

  In order to solve the above-described problems, a lockup device according to the present invention includes a front cover that is rotationally driven by a prime mover, and a pump impeller that rotates together with the front cover and is filled with a fluid for transmitting torque therein. And an output shaft for rotationally driving the external device, an impeller blade disposed on the pump impeller, and a turbine disposed to face the impeller blade and transmitting torque from the housing by a fluid In a fluid transmission device including a blade and a turbine hub that transmits torque transmitted to the turbine blade to the output shaft, the torque of the prime mover is directly output from the front cover to the output shaft by locking up the turbine hub and the front cover. To communicate.

  The lockup device includes a lockup piston having a substantially annular shape disposed between a turbine hub and a front cover, and a front cover that is fixed to a region near the outer periphery of the lockup piston via a clutch facing member. A substantially annular sliding member slidably in contact with the sliding surface, an input side rotating member (side plate) disposed between the lock-up piston and the turbine hub, and an engagement formed in the turbine hub An output side rotation member (hub clutch) having a joint hole, an engagement portion inserted into the engagement hole and engaging with the turbine hub and disposed coaxially with the input side rotation member, and a lock-up piston Between the lockup piston and the output side rotary member, and transmits torque from the lockup piston to the output side rotary member. And a buffer mechanism.

  Here, the input-side rotating member, the buffer mechanism, and the output-side rotating member are components of the torsional vibration reducing mechanism, and the input-side rotating member has its outer peripheral region fixed to the outer peripheral region of the lockup piston. .

  The lockup piston is displaced in the output shaft direction due to the pressure difference of the fluid in the output shaft direction, and due to this displacement, the sliding member fixed to the lockup piston eventually changes with the sliding surface of the front cover. When in sliding contact, the torque of the front cover is transmitted to the output-side rotating member via a sliding member interposed between the lock-up piston that fixes the input-side rotating member and the output-side rotating member (hub clutch). That is, the fluid transmission device is locked up.

  The input side rotating member constituting the torsional vibration reducing mechanism of the lockup device can be composed of one rotating member fixed to the lockup piston, and can be composed of two rotating members. The number of parts can be reduced as compared with a lockup device having Thus, weight reduction, moment of inertia reduction, cost reduction, and the like are realized.

  In order to equalize the fluid pressure in the direction of the output shaft applied to the sliding plate of the sliding member, the sliding member has a mounting portion to the lockup piston and a larger diameter than this mounting portion and is arranged in parallel with the mounting portion. And a sliding plate for slidingly contacting the sliding surface of the front cover, and a connecting portion for coaxially connecting the mounting portion and the sliding plate.

  Such a sliding member is configured such that the sliding plate is disposed between the lockup piston and the front cover by fixing the mounting portion in the vicinity of the outer periphery of the lockup piston. The fluid pressure in the direction of the applied output shaft is made uniform. Further, by appropriately changing the fluid transmission device according to the specifications of the vehicle or the like, it is possible to realize a lockup device that can flexibly cope with various specifications with one basic design.

  In order to improve the durability of the sliding member, it is desirable that its heat capacity be as large as possible than the heat capacity in the vicinity of the outer periphery of the lockup piston.

  Increasing the heat capacity of the rotating member generally increases the moment of inertia. However, since the sliding member in the present invention is fixed in a region near the outer periphery of the lockup piston, the moment of inertia of the lockup piston is not increased. That is, even if the heat capacity of the sliding member is increased by selecting the material constituting the sliding member and changing the shape, the weight and moment of inertia of the lockup piston are not increased.

  At the time of lock-up of the lock-up device, the torque of the front cover that is rotationally driven by the prime mover is at least a sliding surface of the front cover, a sliding member, a lock-up piston, an input-side rotating member, a buffer mechanism, and an output-side rotating member Is transmitted to the turbine hub (claim 4).

  In order to simplify the manufacturing process, the sliding member of the lockup device, the outer peripheral vicinity region of the lockup piston, and the input side rotating member are fixed to each other by a first fastening member (for example, a rivet), In the direction perpendicular to the output shaft, the buffer mechanism of the lockup device includes a region in the vicinity of the outer periphery of the lockup piston, and an engagement portion of the output side rotation member inserted into the engagement hole formed in the turbine hub. (Claim 5).

  In this way, in assembling the lockup device into the fluid transmission device, the lockup device can be assembled into the fluid transmission device after being assembled. Therefore, the manufacturing process of the fluid transmission device and the lockup device, and restrictions on the manufacturing process (such as restrictions on the fastening process by the first fastening member) can be reduced, and reduction in manufacturing cost can be realized.

  In order to make it easy to incorporate the lockup device into the fluid transmission device, the output-side rotating member may have an engaging portion that is substantially orthogonal to the annular region of the output-side rotating member. (Claim 6).

  If the turbine hub is formed integrally with a turbine runner having turbine blades, the turbine hub and the lockup device can be easily coupled (that is, the manufacturing process of the fluid transmission device can be simplified). ), And the number of parts of the fluid transmission device can be reduced. Alternatively, the turbine runner and the turbine hub are fastened by the second fastening member in advance, so that the turbine hub and the lockup device can be easily coupled (simplifying the manufacturing process of the fluid transmission device). (Claim 7).

  When the second fastening member is used, the second fastening member is drilled in the turbine hub in order to avoid a complicated manufacturing process due to the coupling of the turbine runner and the turbine hub by the second fastening member. It arrange | positions between the made engagement hole and the output shaft (Claim 8). That is, the part to be fastened by the second fastening member is a part that does not hinder the engagement between the turbine hub and the lockup piston in the manufacturing process of the fluid transmission device.

  According to the lockup device of the present invention having the above-described configuration, by fixing the sliding member in the vicinity of the outer periphery of the lockup piston, the hydraulic pressure distribution applied to the sliding member is made uniform, and the heat capacity of the sliding member is increased. The durability of the lockup device can be improved.

  Also, when the specifications of the vehicle etc. are different, by selecting the sliding member of the fluid transmission device as appropriate, it is possible to flexibly respond to multiple specifications with one basic design, and near the outer periphery of the lockup piston By fixing the sliding member in the region, the weight and moment of inertia of the lock-up piston can be reduced, so that the fuel efficiency can be improved and the fluid transmission device can be reduced in weight.

  Further, since the input side rotating member constituting the torsional vibration reduction mechanism can be constituted by one rotating member fixed to the lockup piston, the lockup having the input side rotating member constituted by two rotating members. It is lighter than the device, has a small moment of inertia, and can reduce costs. Also, by reducing the number of rivet fastening points, it is possible to reduce assembly manufacturing costs, simplify manufacturing processes, and the like.

  Of course, by forming the turbine hub integrally with the turbine runner, the manufacturing cost can be reduced, the manufacturing process of the fluid transmission device can be simplified, or the turbine runner and the turbine hub can be fastened by a fastening member in advance. Simplification of the manufacturing process of the fluid transmission device can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Example (Example 1) of the lockup apparatus concerning this invention, and the cross-sectional schematic structure of the fluid transmission device incorporating this lockup apparatus. FIG. 2 is a diagram showing a schematic cross-sectional structure of the lockup piston and the like shown in FIG. 1, FIG. 2A shows a schematic plan configuration of the lockup piston and the like, and FIG. It is a figure which shows the cross-sectional schematic structure in FIG. It is a figure which shows schematic structure of the lockup piston in the lockup apparatus shown in FIG. 2, an input side rotation member, a fastening member, and a buffer mechanism. It is a figure which shows the cross-sectional schematic structure of the other Example (Example 2) of the lockup apparatus concerning this invention, and the fluid transmission device incorporating this lockup apparatus. It is a figure which shows an example of the cross-sectional schematic structure of the conventional lockup apparatus (a fluid transmission apparatus is included).

  Hereinafter, a lock-up device according to the present invention will be described with reference to the drawings.

<Schematic configuration of fluid transmission device and lock-up device>
An embodiment of a lockup device according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the torque converter 1 </ b> A has a lockup device 2 </ b> A inside a substantially disk-shaped housing 10 having a thickness. The housing 10 has a front cover 11 that is rotationally driven by an engine (not shown), and a pump impeller 12 that is fixed to the front cover 11 and rotates. Inside the housing 10 is oil for transmitting torque (see FIG. Not shown).

  A plurality of cover bosses 11a are fixed to the vicinity of the outer periphery of the front cover 11 by welding or the like, and torque from the engine is transmitted to the housing 10 via the cover boss 11a. The output shaft 3 arranged in the shape of the central axis of the housing 10 transmits the output torque of the torque converter 1A to the transmission. Between the front cover 11 and the output shaft 3, a torque converter and a lockup device 2A are interposed.

  The torque converter includes an impeller blade 12 a disposed on the pump impeller 12, a turbine blade 13 a, a turbine runner 13 disposed with the turbine blade 13 a, and a stator 14. The pump impeller 12 and the turbine runner 13 facing each other are arranged slightly coaxially with the output shaft 3 and a turbine space 12s is formed between them.

  In the turbine space 12s, a plurality of impeller blades 12a are disposed on the pump impeller 12 side, and a plurality of turbine blades 13a are disposed on the turbine runner 13 side. Between the impeller blades 12a and the turbine blades 13a, a plurality of stators 14 radially deployed with respect to the output shaft 3 enhance the torque transmission efficiency between the blades. In the torque converter 1 </ b> A, a turbine hub 27 formed integrally with the turbine runner 13 transmits torque transmitted to the turbine blade 13 a to the output shaft 3.

  The lock-up device 2A includes a lock-up piston 21, a sliding member 22, a side plate (input side rotating member) 23, a rivet (first fastening member) 24, a buffer mechanism 25, a hub clutch (output side rotating member) 26, The turbine hub 27 and a clutch engagement hole 27h formed in the turbine hub 27 are included. As described above, the turbine hub 27 is interposed between the turbine runner 13 and the output shaft 3 and is a common component of the torque converter and the lockup device 2A.

  The lockup piston 21, the side plate 23, the buffer mechanism 25, and the hub clutch 26 are disposed between the turbine hub 27 and the front cover 11 so that their rotational surfaces are parallel to the front cover 11. The lockup piston 21 is displaced in the axial direction of the output shaft 3 by the hydraulic pressure in the output shaft direction. The turbine hub 27 transmits torque to the output shaft 3 via a hub shaft portion 27 a that slides in the axial direction of the output shaft 3.

  FIG. 2 is a diagram showing a schematic configuration of the lock-up piston 21, the sliding member 22, the side plate 23, the rivet 24, the buffer mechanism 25, and the hub clutch 26 in the lock-up device 2A. FIG. FIG. 2B is a diagram illustrating a schematic cross-sectional configuration of the lockup piston 21 and the like in the output shaft direction. 2A shows a schematic plan configuration when the lockup piston 21 and the like are viewed from the turbine runner 13 side, and a region between XX is a plane of the buffer mechanism 25 and the hub clutch 26 and the like seen through the side plate 23. FIG. A schematic configuration is shown.

  FIG. 3 is a diagram showing the lock-up piston 21, the sliding member 22, the side plate 23, the buffer mechanism 25, the hub clutch 26, and the like in more detail.

<Lock-up piston>
The lock-up piston 21 has a substantially flat annular shape, and is attached to the torque conversion portion such that the surface 21a faces the inner surface 11b of the front cover 11 (FIGS. 1 and 2). As shown in FIG. 2B, a shaft hole 21 c into which the hub shaft portion 27 a of the turbine hub 27 and the output shaft 3 are inserted is formed in the center portion of the lockup piston 21. The outer periphery of the shaft hole 21c is defined by a flat cylindrical portion 21d erected on the surface 21a side of the lockup piston 21.

  A plurality of piston-side holding portions 21 h for holding the buffer mechanism 25 are formed on the circumference slightly inside the outer peripheral vicinity region (piston outer peripheral vicinity region 21 b) of the lockup piston 21. The piston side holding portion 21h rises on the front surface 21a side of the lockup piston 21 and forms a recess on the back surface side.

<Sliding member>
As shown in FIGS. 2 and 3, the sliding member 22 has a mounting flange (mounting portion) 22a having an annular shape substantially the same as the piston outer peripheral vicinity region 21b, and a sliding whose diameter is larger than that of the mounting flange 22a. It has a flange (sliding plate) 22b and a connecting portion 22c. The connecting portion 22c has a cylindrical shape, connects the outer peripheral area of the mounting flange 22a and the inner peripheral area of the sliding flange 22b, and both flanges are arranged coaxially and in parallel.

  The sliding member 22 is fixed to the lockup piston 21 together with the side plate 23 with a rivet 24. The sliding member 22 is fixed on the surface 21a side of the piston outer peripheral vicinity region 21b, and the sliding flange 22b is slightly separated from the surface 21a by the connecting portion 22c of the sliding member 22.

  Thus, when the lock-up piston 21 and the sliding member 22 are fixed, the sliding flange 22b is positioned outside the outer periphery of the lock-up piston 21 and closer to the front cover 11 than the lock-up piston 21. (Fig. 1). As a result, the sliding member 22 receives the hydraulic pressure in the output shaft direction together with the lockup piston 21.

<Side plate>
As shown in FIGS. 2 and 3, the side plate 23 has a substantially annular shape whose outer diameter is substantially equal to the outer diameter of the lockup piston 21, and its outer periphery vicinity region (side plate outer periphery vicinity region 23 a). Is fixed by a rivet 24 on the back side of the lock-up piston 21. The body 24a of the rivet 24 is interposed between the lock-up piston 21 and the side plate 23, and the distance between the two is slightly larger than the plate thickness of the hub clutch 26.

  In the side plate 23, a side plate side holding portion 23h is formed at a portion corresponding to the piston side holding portion 21h. The side plate side holding portion 23h and the piston side holding portion 21h can hold the buffer mechanism 25 together with the hub clutch 26 therebetween. The inner edge 23b of the side plate 23 is slightly inside the side plate side holding portion 23h.

<Hub clutch and shock absorber>
As shown in FIG. 3, the hub clutch 26 has a substantially annular shape whose outer diameter is slightly smaller than the outer diameter of the side plate 23 and whose inner diameter is slightly smaller than the inner diameter of the side plate 23. A plurality of engaging portions 26 b extend in a direction orthogonal to the annular shape portion of the hub clutch 26 in the inner peripheral vicinity region (hub clutch inner peripheral vicinity region) 26 a of the hub clutch 26.

  The hub clutch 26 has a lock-up piston between the lock-up piston 21 and the side plate 23 such that the outer periphery is slightly inside the rivet 24 and the engaging portion 26b is slightly inside the inner edge 23b of the side plate 23. It is arranged so as to extend on the opposite side to 21. As shown in FIG. 2 (a), when the hub clutch 26 is viewed from the turbine runner 13 side together with the lock-up piston 21 and the like, a plurality of engaging portions 26b having a rectangular shape in plan view are arranged in a circular shape at intervals. Has been.

  The hub clutch 26 is slightly thinner than the distance between the lockup piston 21 and the side plate 23 (FIG. 3), and is not fixed to either the lockup piston 21 or the side plate 23.

  The buffer mechanism 25 is interposed between the lock-up piston 21 and the hub clutch 26, and one end portion thereof is held by the piston side holding portion 21h and the side plate side holding portion 23h, and transmits torque to the other end portion. . Therefore, the torque transmitted to the lockup piston 21 is transmitted to the hub clutch 26 via the buffer mechanism 25, and the torsional vibration that may occur at the time of lockup is absorbed and attenuated.

<Incorporation of lock-up device into fluid transmission device>
The lockup device 2A is incorporated into the torque converter 1A by incorporating the lockup piston 21 and the like into the assembled torque converter. At this time, the turbine hub 27 that is a component of the lockup device 2 </ b> A is integrated with the turbine runner 13, and thus is included together with the turbine runner 13 on the torque conversion unit side.

  Separately from the assembly of the torque converter, the buffer mechanism 25 and the hub clutch 26 are positioned between the lock-up piston 21 and the side plate 23, and then the lock-up piston 21, the sliding member 22 and the side plate 23 are moved by the rivets 24. The locked lockup piston 21 and the like are engaged with the turbine hub 27 in advance. At this time, the hub shaft portion 27a of the turbine hub 27 is inserted into the shaft hole 21c of the lock-up piston 21, and the engaging portion 26b of the hub clutch 26 is inserted into the clutch engaging hole 27h of the turbine hub 27 to lock the shaft. The up piston 21 and the like and the turbine hub 27 are engaged. The clutch engagement hole 27h has substantially the same shape as the rectangular shape in the plan view of the engagement portion 26b of the hub clutch 26, and is formed in parallel with the output shaft 3, and the clutch engagement hole 27h and the engagement portion 26b slides.

  After integrating the torque converter and the lockup device 2A in this way, the front cover 11 and the pump impeller 12 are integrated, and the torque converter 1A is assembled. In the torque converter 1 </ b> A, the lock-up piston 21, the side plate 23, the buffer mechanism 25, and the hub clutch 26 are disposed between the turbine hub 27 and the front cover 11 so that their rotational surfaces are parallel to the front cover 11. Monkey.

  In the lock-up device 2A, the fastening of the rivet 24 such as the lock-up piston 21 can be performed in a separate process from the assembly of the torque converter, so that the torque converter manufacturing process can be simplified.

<Lock-up operation>
As shown in FIG. 1, in the torque converter 1 </ b> A, a space between the front cover 11 and the lockup piston 21 in the housing 10 is a front side internal space 11 s, and between the lockup piston 21 and the turbine runner 13. Is a turbine-side internal space 10s. The front side internal space 11s communicates with a hydraulic control device (not shown) through a hydraulic control hole 3h formed in the output shaft 3, and the hydraulic pressure in the front side internal space 11s is controlled by the hydraulic control device. Is done.

  The lockup piston 21 can be displaced toward the turbine runner 13 by making the oil pressure in the front side internal space 11s higher than the oil pressure in the turbine side internal space 10s by the hydraulic control device (of course, together with the lockup piston 21, The sliding member 22, the side plate 23, the buffer mechanism 25, the hub clutch 26, and the turbine hub 27 can be displaced.) In a state where the lock-up piston 21 is displaced toward the turbine runner 13 side, the torque converter 1A is not locked up, and torque from the engine is transmitted to the output shaft 3 by the torque converter.

  When the oil pressure in the turbine-side internal space 10s is made higher than the oil pressure in the front-side internal space 11s by the hydraulic control device, the lock-up piston 21 and the like are displaced toward the front cover 11 and eventually lock up as shown in FIG. A sliding member 22 fixed to the piston 21 is in sliding contact with the front cover 11. In this state, torque transmitted from the engine to the front cover 11 is transmitted to the output shaft 3 via the lockup device 2A (the torque converter 1A is locked up).

  More specifically, the sliding flange 22 b of the sliding member 22 positioned closer to the front cover 11 than the lockup piston 21 is in sliding contact with the sliding surface 11 c of the front cover 11 via the clutch facing member 15. The sliding flange 22b is disposed outside the outer periphery of the lockup piston 21 (FIG. 2 (a)), and a member that covers the sliding flange 22b is disposed in the turbine-side internal space 10s. Therefore, the hydraulic pressure in the turbine-side inner space 10s directly acts on the sliding flange 22b, and the hydraulic pressure distribution is made uniform. In this way, the sliding flange 22b is in sliding contact with the sliding surface 11c of the front cover 11 by the hydraulic pressure that acts directly and uniformly, so that the lockup device 1A can realize a good lockup operation.

  The lock-up device 2A in which the sliding member 22 is a separate component from the lock-up piston 21 is selected by selecting the material and shape of the sliding member 22 (such as the thickness of the sliding flange 22b), that is, the lock-up piston 21 The heat capacity of the sliding member 22 can be increased without increasing the weight and the moment of inertia. Even if the weight and moment of inertia of the sliding member 22 increase due to an increase in heat capacity, such weight increase remains in the sliding member 22, so that a lightweight and highly durable lockup device can be realized. .

  The lock-up piston 21 is made of cast or heat-forged material, while the sliding part is made of a material with excellent heat resistance and wear resistance. Correspondingly, variations of the lock-up device can be expanded and the cost can be reduced.

  Since the mounting flange 22a of the sliding member 22 is fastened to the surface 21a of the lockup piston 21 by the rivet 24, the hydraulic load received by the lockup piston 21 acts on the entire area of the surface of the mounting flange 22a. Therefore, a tensile stress due to hydraulic pressure does not act on the rivet 24, and a highly durable lockup device can be realized.

  In the lock-up device 2A, the thickness of the turbine hub 27 is increased to deepen the clutch engagement hole 27h, and the opening of the clutch engagement hole 27h is widened. Therefore, the contact pressure per unit contact area between the two can be reduced, and the wear resistance and durability of both can be improved.

  The clutch facing member 15 is attached to the sliding surface 11c of the front cover 11, but is attached to the sliding member 22 side or both the sliding surface 11c and the sliding member 22 of the front cover 11. May be.

  Another embodiment (lockup device 2B) of the lockup device according to the present invention will be described with reference to FIG. In addition, about the component which has the function similar to 2 A of lockup apparatuses, the same code | symbol is attached | subjected and those description is abbreviate | omitted.

  In the torque converter 1A (Example 1) shown in FIG. 1 and the like, the turbine runner 13 and the turbine hub 27 are integrally formed. On the other hand, in the torque converter 1B (Embodiment 2) shown in FIG. 4, the turbine runner 13 ′ and the turbine hub 27 ′ are separate components (separate parts), and both are rivets (second fastening). Member) 28. The rivet 28 fixes the turbine runner 13 ′ and the turbine hub 27 ′ at a portion closer to the output shaft 3 than the clutch engagement hole 27 h drilled in the turbine hub 27 ′ (to the turbine runner 13 ′). Is provided with a clutch engagement hole 13h communicating with the clutch engagement hole 27h at a portion facing the clutch engagement hole 27h.

  The lock-up device 2B is incorporated into the torque converter 1B by incorporating the lock-up piston 21 or the like into the assembled torque converter. At this time, the turbine hub 27 ′, which is a component of the lockup device 2 </ b> B, is fixed by the turbine runner 13 ′ and the rivet 28, and is included on the torque conversion unit side together with the turbine runner 13 ′.

  Separately from the assembly of the torque converter, the lockup piston 21 and the like are fastened by the rivet 24, and the fastened lockup piston 21 and the like are engaged with the turbine hub 27 '. At this time, the engaging portion 26b of the hub clutch 26 is inserted into the clutch engaging hole 27h of the turbine hub 27 and the clutch engaging hole 13h of the turbine runner 13 '. The turbine runner 13 'and the turbine hub 27' can be fixed by the rivet 28 before the lockup device 2B is assembled into the torque conversion unit. Therefore, the assembly process of the torque conversion unit and the assembly process of the lockup device 2B are performed. Does not cause mutual restrictions (the manufacturing process is not complicated).

  After integrating the torque converter and the lockup device 2B in this way, the front cover 11 and the pump impeller 12 are integrated, and the torque converter 1B is assembled.

  The above-described lock-up device according to the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented without changing their gist.

  Since the lock-up device according to the present invention can be manufactured and used industrially, and can be sold, the present invention is an invention having economic value and industrial applicability.

1A, 1B Fluid transmission device (torque converter)
2A, 2B Lock-up device 3 Output shaft 10 Housing 11 Front cover 11b Front cover inner surface 11c Front cover sliding surface 12 Pump impeller 12a Impeller blade 13 Turbine runner 13a Turbine blade 15 Clutch facing member 21 Lock-up piston 21b Lock Upper piston vicinity region 22 Sliding member 22a Sliding member mounting portion (mounting flange)
22b Sliding plate of sliding member (sliding flange)
22c Connecting part 23 of sliding member Input side rotating member (side plate)
24 First fastening member (rivet)
25 Buffer mechanism 26 Output side rotating member (hub clutch)
26b Engaging portion 27 of output side rotation member Turbine hub 27h Clutch engagement hole 28 of turbine hub Second fastening member (rivet)

Claims (8)

At least a front cover that is rotationally driven by torque from a power source, and a housing that has a pump impeller that rotates together with the front cover and that is filled with a fluid for transmitting torque therein.
An output shaft for rotationally driving the external device;
An impeller blade disposed in the pump impeller;
A turbine blade disposed opposite to the impeller blade and to which torque from the housing is transmitted by the fluid;
A lockup device in a fluid transmission device comprising a turbine hub for transmitting torque transmitted to the turbine blade to the output shaft,
A lock-up piston disposed between the turbine hub and the front cover and having a substantially annular shape that is displaceable in the output shaft direction by a pressure difference of the fluid in the output shaft direction;
When the lock-up piston is fixed in the vicinity of the outer periphery of the lock-up piston and the lock-up piston is displaced toward the front cover due to displacement in the output shaft direction, the sliding surface of the front cover via the clutch facing member A substantially annular sliding member having a sliding plate with a diameter larger than that of the lock-up piston in sliding contact;
An input-side rotating member that is disposed between the lockup piston and the turbine hub and in which a region near the outer periphery of the side plate is fixed to a region near the outer periphery of the lockup piston;
An engagement hole formed in the turbine hub;
An output side rotation member having an engagement portion inserted into the engagement hole, engaged with the turbine hub, and disposed coaxially with the input side rotation member;
It is disposed between the lock-up piston and the input-side rotating member, and is interposed between the lock-up piston and the output-side rotating member so that torque from the lock-up piston is rotated on the output side. A lock-up device comprising a buffer mechanism for transmitting to a member. The sliding member is
An attachment to the lock-up piston;
A connecting portion that coaxially connects the attachment portion and the sliding plate;
By fixing the mounting portion in the vicinity of the outer periphery of the lock-up piston, the sliding plate disposed in parallel with the mounting portion is disposed between the lock-up piston and the front cover, The lockup device according to claim 1, wherein a pressure of the fluid in the output shaft direction applied to the sliding plate is made uniform.   The lockup device according to claim 2, wherein a heat capacity of the sliding member is larger than a heat capacity of a region near the outer periphery of the lockup piston. When the sliding member slides on the sliding surface of the front cover due to the pressure difference of the fluid in the output shaft direction,
The torque of the rotationally driven front cover is applied to the turbine via the sliding surface of the front cover, the sliding member, the lock-up piston, the input side rotating member, the buffer mechanism, and the output side rotating member. The lockup device according to claim 1, wherein the lockup device is transmitted to a hub. The sliding member, the outer peripheral vicinity region of the lock-up piston, and the input side rotating member are fixed to each other by a first fastening member,
It said output rotary member engaged with the buffering mechanism is disposed between the engagement portion of the front SL lock-up piston outer periphery region and the output rotary member in the direction orthogonal to the output shaft The lock-up device according to claim 4.   The lock-up device according to claim 5, wherein the engagement portion of the output-side rotating member is substantially orthogonal to an annular region included in the output-side rotating member. The turbine hub is formed integrally with a turbine runner comprising the turbine blades;
The lockup device according to claim 5 or 6, wherein the turbine runner and the turbine hub are fixed to each other by a second fastening member. The lockup device according to claim 7, wherein the turbine runner and the turbine hub are fixed to each other by a second fastening member.
The lockup device, wherein the second fastening member is disposed at a position closer to the output shaft than the engagement hole of the turbine hub.

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