JP2018128114A - Starting device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress variation in a stroke amount of a lock-up piston and set a target value of the stroke amount to a small value to further increase responsiveness of lock-up, in a starting device including a single plate type lock-up clutch.SOLUTION: A starting device includes a sleeve 90 for supporting a lock-up piston 80 so as to be movable in an axial direction. The sleeve 90 has a press-fit part 90a provided in the center in a radial direction of a side wall part 33 of a front cover 3 and press-fitted into a recess part 35 recessed in the axial direction. A flange-shaped projection part 92 for positioning the lock-up piston 80 by abutting on a face 80a on an opposite side to a face to which a friction material 81 of the lock-up piston 80 is attached is installed at an outer peripheral surface.SELECTED DRAWING: Figure 2

Description

  The present specification discloses a starting device and a manufacturing method thereof.

  Conventionally, this type of starting device includes a front cover as an input member connected to an engine, a pump impeller that rotates integrally with the front cover, a hub (as an output member) that is disposed to face the pump impeller ( A turbine runner connected to the turbine hub), a lockup clutch for connecting the front cover and the hub via a damper device, and a lockup clutch for releasing the lockup, and the front cover and the pump impeller. What is joined by welding is proposed (for example, refer patent document 1). The lock-up clutch is affixed to a lock-up piston that is movable in the axial direction of the starting device, with the inner peripheral cylindrical portion supported by the outer peripheral surface of the hub cylindrical portion, and the front cover side surface of the lock-up piston. It is comprised as a single plate type clutch which has a friction material. In this starting device, a shim for adjusting the initial position of the lockup piston is provided between the inner peripheral cylindrical portion of the lockup piston and the flange portion of the hub. This shim is selected to have a thickness that makes the gap between the friction material and the front cover a desired gap, assuming the amount of deformation of the front cover due to welding distortion and the amount of deformation of the front cover due to centrifugal hydraulic pressure during use. The

JP 2014-47811 A

  In the above-described starting device, the shim is selected assuming the amount of deformation of the front cover, but since the shim is provided in the hub as the output member, the amount of deformation of the front cover as the input member is larger than expected or supports the hub. If the dimensional error of each component on the output member side is large, the actual gap between the friction material and the front cover may not be a desired gap. In this case, the variation in the stroke amount of the lockup piston cannot be sufficiently suppressed, and the lockup response may be lowered.

  The main object of the present disclosure is to improve the responsiveness of the lockup by further suppressing the variation in the stroke amount of the lockup piston in the one having the single-plate lockup clutch.

  The starting device and the manufacturing method thereof according to the present disclosure employ the following means in order to achieve the main object described above.

  The starting device of the present disclosure includes an input member, an output member to which power is transmitted from the input member via a fluid transmission device, a lockup for connecting the input member and the output member, and release of the lockup. A lockup clutch that is a single plate clutch having a lockup piston and a friction material attached to a surface of the lockup piston on the input member side. The input member has an annular side wall portion extending in the radial direction, and a hollow portion that is recessed in the axial direction is provided at the radial center of the side wall portion, and the lock-up piston is connected to the shaft of the starting device. A cylindrical member that is movably supported in a direction, and the cylindrical member includes a press-fit portion that is press-fitted into the hollow portion of the input member, and the friction material of the lock-up piston. The Ri attached is a surface and a positioning unit for positioning the lock-up piston in contact with the surface opposite to the gist that.

  The starting device of the present disclosure includes a cylindrical member that supports the lock-up piston so as to be movable in the axial direction of the starting device, and the cylindrical member is provided at the radial center of the side wall portion of the input member and is recessed in the axial direction. A press-fit portion that is press-fitted into the hollow portion, and a positioning portion that contacts the surface of the lock-up piston opposite to the surface to which the friction material is attached to position the lock-up piston. For this reason, the lock-up is performed so that the axial distance between the friction contact surface of the friction material that contacts the input member during lock-up and the opposing surface of the input member that faces the friction contact surface is not separated more than necessary. The piston can be positioned. Therefore, variation in the distance between the friction contact surface of the friction material attached to the lockup piston and the opposing surface of the input member, i.e., variation in the stroke amount of the lockup piston, can be suppressed. It can be improved further.

  A starting device manufacturing method of the present disclosure includes an input member, an output member to which power is transmitted from the input member via a fluid transmission device, a lockup for connecting the input member and the output member, and the lockup A lock-up clutch that can be released, and the lock-up clutch is a single-plate clutch having a lock-up piston and a friction material attached to a surface of the lock-up piston on the input member side, The input member has an annular side wall portion extending in the radial direction, and a hollow portion that is recessed in the axial direction is provided at the radial center of the side wall portion, and the lock-up piston is disposed in the axial direction of the starting device. Positioning that supports the movable member and positions the lock-up piston by contacting the surface of the lock-up piston opposite to the surface to which the friction material is attached. (A) The axial direction of the facing surface of the input member facing the friction material of the lock-up piston and the outer surface of the side wall portion of the input member A first distance in the axial direction, a second distance in the axial direction between an end surface of the friction material of the lock-up piston and a surface opposite to a surface on which the friction material is attached, and the cylindrical member in the axial direction. A step of measuring a third distance in the axial direction between an end surface on one end side and an abutting surface that abuts the lock-up piston at the positioning portion; and (b) assembling the lock-up piston on the tubular member. Pressing the cylindrical member from the one end side while supporting the outer surface of the side wall portion of the input member and press-fitting into the hollow portion of the input member; and (c) the input portion. Joining the constituent members of the fluid transmission device to each other by welding, and in the step (b), the one end side of the cylindrical member from the outer surface of the side wall portion of the input member after the press-fitting is performed. The amount of deformation in the axial direction of the input member assumed by the press-fitting height to the end surface is the first distance, the second distance, the third distance, and the welding distortion in the step (c), The gist is that the cylindrical member is press-fitted into the recess so as to be the sum of the stroke amount of the lock-up piston in the axial direction.

  In the manufacturing method of the starting device of the present disclosure, in the step of pressing the cylindrical member from one end side and press-fitting into the hollow portion of the input member, the end surface on the one end side of the cylindrical member from the outer surface of the side wall portion of the input member after press-fitting The press-fit height until the first distance in the axial direction between the opposing surface of the input member and the outer surface of the side wall portion of the input member, and the axis between the end surface of the friction material of the lockup piston and the surface opposite to the friction material The second distance in the direction, the third distance in the axial direction between the end surface of one end of the cylindrical member and the contact surface that contacts the lock-up piston in the positioning portion, and the deformation in the axial direction of the input member assumed by welding distortion The tubular member is press-fitted into the recess so as to be the sum of the amount and the stroke amount of the lockup piston in the axial direction. For this reason, the variation element that must be considered in order to determine the piston stroke is only the parts such as the input member and the lock-up piston. Since the deformation need not be taken into consideration, the target stroke value can be reduced, and the lockup response can be further improved.

It is a schematic block diagram of the starting apparatus 1 of this indication. 1 is a cross-sectional view of a starting device 1. FIG. 4 is a process diagram showing a manufacturing process of the starting device 1. 2 is a cross-sectional view of a part of the starting device 1. FIG. It is sectional drawing which assembled | attached some components. It is a fragmentary sectional view of starting device 1B.

  Next, embodiments for carrying out the invention of the present disclosure will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a starting device 1 according to the present disclosure, and FIG. 2 is a cross-sectional view of the starting device 1. The starting device 1 is mounted on a vehicle including an engine (internal combustion engine) EG as a prime mover, and is fixed to the front cover 3 (input member) connected to the crankshaft of the engine EG and the front cover 3. A torque converter (fluid transmission device) TC, and a damper hub 7 as an output member fixed to an input shaft IS of a transmission (power transmission device) TM such as an automatic transmission (AT) or a continuously variable transmission (CVT) The damper device 10 that attenuates vibration between the front cover 3 and the input shaft IS of the transmission TM, the lockup that connects the front cover 3 and the damper hub 7 via the damper device 10, and the release of the lockup A lock-up clutch 8 to be executed.

  In the following description, “axial direction” basically indicates the extending direction of the central axis CA (axial center, see FIG. 2) of the starting device 1 and the damper device 10 unless otherwise specified. . The “radial direction” is basically the radial direction of a rotating element such as the starting device 1 or the damper device 10, that is, from the central axis CA to the central axis CA of the starting device 1 or the damper device 10, unless otherwise specified. The extending direction of a straight line extending in a direction (radial direction) perpendicular to the direction is shown. Furthermore, “circumferential direction” basically indicates the circumferential direction of the rotating elements such as the starting device 1 and the damper device 10, that is, the direction along the rotating direction of the rotating elements, unless otherwise specified.

  As shown in FIGS. 2 and 3, the front cover 3 includes a center piece 31, a side wall portion 33 which is joined to the center piece 31 by welding and extends in the radial direction, and a start device from the outer periphery of the side wall portion 33. And a cover main body 32 including an outer cylinder portion 34 extending to the transmission TM side (left side in FIG. 2) in the axial direction of the first. A nut 39 is attached to the outer surface of the side wall portion 33. Although not shown in the drawings, the nut 39 is fastened with a bolt that is inserted into a connection hole of a drive plate attached to a crankshaft of the engine EG. Further, the side wall 33 is formed with a hollow 35 that is recessed in a cylindrical shape toward the axial engine EG side (outward) at the center in the radial direction. A sleeve 90 having a cylindrical side wall 91 is fixed to the recess 35 by press-fitting. The end of the sleeve 90 that is press-fitted into the recess 35 is referred to as a press-fitting part 90a. The sleeve 90 is provided with a protruding portion 92 that protrudes in the form of a flange outward in the radial direction from the outer peripheral surface of the side wall portion 91 at the end opposite to the press-fit portion 90a. The sleeve 90 is a bottomed member that is open at the end opposite to the press-fit portion 90 a in the axial direction and is closed by the end wall portion 94 at the end on the press-fit portion 90 a side. In the sleeve 90, the input shaft IS is rotatably fitted on the inner peripheral side of the opening end opposite to the press-fit portion 90a.

  As shown in FIGS. 1 and 2, the torque converter (fluid transmission device) TC includes a pump impeller 4 fixed to the front cover 3 and a turbine runner 5 that can rotate coaxially with the pump impeller 4. The pump impeller 4 includes a pump shell 40 that is fixed to the front cover 3 and defines a fluid chamber 9 through which hydraulic oil flows, and a plurality of pump blades 41 disposed on the inner surface of the pump shell 40. In the present embodiment, the front cover 3 and the pump shell 40 are joined (integrally) by arc welding in a state where the end surface 34a of the outer cylinder portion 34 of the front cover 3 and the end surface 42a of the pump shell 40 are in contact in the axial direction. ). Thereby, the front cover 3 and the pump shell 40 are joined via the arc welding part 49. The turbine runner 5 includes a turbine shell 50 and a plurality of turbine blades 51 disposed on the inner surface of the turbine shell 50. The inner peripheral portion of the turbine shell 50 is connected (fixed) to a damper hub (output member) 7 through a plurality of rivets. The pump impeller 4 and the turbine runner 5 face each other, and a stator 6 that rectifies the flow of hydraulic oil (working fluid) from the turbine runner 5 to the pump impeller 4 is coaxially disposed between the pump impeller 4 and the turbine runner 5. . The stator 6 includes a plurality of stator blades 60 and a blade support portion 61 that supports the plurality of stator blades 60. Further, the rotation direction of the stator 6 is set in only one direction by the one-way clutch 62. These pump impeller 4, turbine runner 5, and stator 6 form a torus (annular flow path) for circulating hydraulic oil, and function as a torque converter having a torque amplification function. However, in the starting device 1, the stator 6 and the one-way clutch 62 of the torque converter TC may be omitted, and the pump impeller 4 and the turbine runner 5 may function as a fluid coupling.

  A connecting member 44 is connected to the radially inner side of the pump shell 40. A thrust bearing 45 and a race 46 are arranged between the connecting member 44 and the blade support portion 61 of the stator 6 in the axial direction.

  The damper hub 7 has a cylindrical tubular portion 70 and an outer extending portion 71 that extends radially outward on the front cover 3 side (right side in FIG. 2) in the axial direction of the tubular portion 70. A thrust bearing 65 and a race 66 are disposed between the outer extending portion 71 and the blade support portion 61 of the stator 6 in the axial direction.

  As shown in FIGS. 1 and 2, the damper device 10 includes a drive member (input element) 11, a first intermediate member (first intermediate element) 12, and a second intermediate member (second intermediate element) 14 as rotating elements. And a driven member (output element) 15. Further, the damper device 10 includes a plurality of first springs (first elastic bodies) SP1 that transmit torque between the drive member 11 and the first intermediate member 12 as a torque transmission element (torque transmission elastic body), a first one. A plurality of second springs (second elastic bodies) SP <b> 2 that transmit torque between the intermediate member 12 and the second intermediate member 14, and a plurality of torques that transmit torque between the second intermediate member 14 and the driven member 15. A third spring (third elastic body) SP3 is included. The drive member 11 is connected (fixed) to the lockup piston 80 of the lockup clutch 8 so as to rotate integrally. The driven member 15 is coupled (fixed) to the damper hub 7 so as to rotate together with the turbine runner 5. Thereby, the lockup piston 80 is connected to the damper hub 7 as an output member via the damper device 10. The driven member 15 may be connected to any one of the drive member 11 and the first and second intermediate members 12 and 14 instead of the turbine runner 5 and the damper hub 7.

  As shown in FIGS. 2 and 3, the lockup clutch 8 is configured as a hydraulic single-plate clutch, and is close to the inside of the front cover 3 and the inner wall surface of the front cover 3 on the transmission TM side (left side in FIG. 2). And a lock-up piston 80 which is fitted to the side wall 91 of the sleeve 90 so as to be rotatable and movable in the axial direction. A friction material 81 is attached to the outer peripheral side of the lockup piston 80 and the surface on the front cover 3 side. Note that the side wall 33 of the front cover 3 includes a facing surface 33 a that faces the friction material 81 attached to the lockup piston 80. Further, between the lock-up piston 80 and the front cover 3, an operating oil supply path, an oil path formed in the input shaft IS of the transmission TM, and an oil path 91 a formed in the side wall portion 91 of the sleeve 90 are interposed. Thus, a lockup chamber 85 connected to a hydraulic control device (not shown) is defined. In the starting device 1, the hydraulic pressure control device makes the hydraulic pressure in the fluid chamber 9 higher than the hydraulic pressure in the lockup chamber 85, thereby moving the lockup piston 80 toward the facing surface 33 a of the front cover 3. 8 is engaged (completely engaged or slip-engaged), and lockup is performed to connect the front cover 3 and the damper hub 7 via the damper device 10. Further, by making the hydraulic pressure in the lockup chamber 85 higher than the hydraulic pressure in the fluid chamber 9 by the hydraulic control device, the lockup piston 80 is moved to the side opposite to the front cover 3 to release the lockup clutch 8. Release the lockup.

  Here, in the present embodiment, as described above, the protruding portion 92 that protrudes radially outward from the outer peripheral surface of the side wall portion 91 of the sleeve 90 is provided. A washer 98 adjacent to the front cover 3 side is disposed on the protruding portion 92. The lockup piston 80 has a surface 80a on the inner side in the radial direction, that is, the inner peripheral surface 80a of the surface opposite to the surface on which the friction material 81 is provided, abutting against the protruding portion 92 via the washer 98, whereby the front cover Movement to the opposite side to 3 is restricted. For this reason, the protruding portion 92 of the sleeve 90 functions as a positioning portion that determines the position of the lockup piston 80 on the side opposite to the front cover 3.

  Next, the operation | work at the time of manufacturing the start apparatus 1 is demonstrated. FIG. 3 is a process diagram showing a manufacturing process of the starting device 1, FIG. 4 is a cross-sectional view of a part of the starting device 1, and FIG. 5 is a cross-sectional view in which a part of the starting device 1 is assembled. . In manufacturing the starting device 1, first, as shown in FIG. 4, four parts A, B, C, and D are prepared (S100). Here, the part A is the front cover 3. The part B is obtained by connecting (fixing) the drive member (input element) 11 of the damper device 10 to the lockup piston 80 to which the friction material 81 is attached. Part C is a washer 98. Part D is a sleeve 90.

  When the parts A, B, C, and D are prepared, the distances La, Lb, Lc, and Ld shown in FIG. 4 are measured (S110). The distance La (first distance) is a distance in the axial direction between the facing surface 33a of the side wall portion 33 of the front cover 3 and the outer surface 33b of the side wall portion 33 opposite to the facing surface 33a in the component A. This corresponds to the thickness of the side wall 33 on the surface 33a. The distance Lb (second distance) is a distance in the axial direction between the friction contact surface 81a that is the end surface of the friction material 81 and the surface 80a opposite to the surface to which the friction material 81 is attached. is there. The distance Lc is the axial thickness of the washer 98 in the component C. The distance Ld is the thickness of the protrusion 92 in the axial direction in the component D.

  Next, based on the measured distances La, Lb, Lc, Ld, the deformation amount δ due to welding distortion, and the stroke amount St of the lock-up piston 80, a reference Sp serving as a reference position during press-fitting (see FIG. 5). The press-fit height Ph from is set (S120). Details of the deformation amount δ and the press-fit height Ph will be described later. When the press-fit height Ph is set, parts B and C and a seal member such as a seal ring are assembled to the part D (S130), and the parts B and C are assembled based on the press-fit height Ph set in S120. D (sleeve 90) is fixed to the recess 35 of the part A (front cover 3) by press-fitting (S140). The press-fitting of S140 is to press the end face 91b on the left side in FIG. 4 of the sleeve 90 in a state in which the outer surface 33b of the side wall 33 of the front cover 3 is supported by a jig (not shown) on which the nut 39 is not attached. Done in And assembly of components other than the torque converter TC and the drive member 11 of the damper device 10 and the remaining components such as the damper hub 7, the end surface 34a of the outer cylindrical portion 34 of the front cover 3, and the end surface 42a of the pump impeller 4 (pump shell 40). Arc welding is performed in a state where the two are in contact with each other in the axial direction (S150), and the starting device 1 is manufactured.

  Thus, the manufacturing process of the starting device 1 includes a process of press-fitting the sleeve 90 into the recessed portion 35 of the front cover 3 by pressing the end surface 91b. The outer surface 33b supported by the jig at the time of press-fitting becomes the above-described reference Sp at the time of press-fitting. For this reason, the distance La is the distance between the outer surface 33b of the front cover 3 serving as the reference Sp during press-fitting and the opposing surface 33a. The distance Ld is the distance between the end surface 91b of the sleeve 90 that is pressed during press-fitting and the end surface 92a of the protrusion 92 on the lock-up piston 80 side. The stroke amount St of the lock-up piston 80 is a distance in the axial direction between the friction contact surface 81a that is the tip surface of the friction material 81 of the lock-up piston 80 and the facing surface 33a of the side wall portion 33 of the front cover 3. Yes, the lockup piston 80 is set to a value that is not separated beyond the predetermined range in the unlocked state. It should be noted that the predetermined range of the stroke amount St is set to, for example, a sufficient range of several mm to several mm. Here, in this embodiment, the front cover 3 and the pump impeller 4 (pump shell 40) are joined by arc welding, and a slight welding distortion occurs. The deformation amount in the axial direction assumed on the facing surface 33a of the front cover 3 due to such welding distortion is defined as a deformation amount δ. The weld distortion usually occurs in the direction in which the front cover 3 and the pump impeller 4 are separated from each other in the axial direction around the arc welded portion 49, that is, in the direction in which the stroke amount St is increased. The deformation amount δ is a negative value for deformation in the left direction in FIG. 4 and a positive value for deformation in the right direction in FIG. 4 with respect to an ideal reference Sp in which no welding distortion occurs. Further, the deformation amount δ is, for example, from a few hundredths of mm to a sufficient number of mm.

  The press-fit height Ph set in S120 described above is the distance (height) from the outer surface 33b, which is the reference Sp, to the end surface 91b of the sleeve 90 after press-fitting, and the distance La, the distance Lb, the distance Lc, and the distance Ld. The sum of the stroke amount St and the deformation amount δ (La + Lb + Lc + Ld + St + δ) is used. Thus, since the press-fit height Ph is a value that takes into account the deformation amount δ, the sleeve 90 is fixed so that the protruding portion 92 and the washer 98 are positioned at a position corresponding to the deformation amount δ. Therefore, even if welding distortion occurs in S150 after press-fitting, the protrusion 92 and the washer 98 restrict the lock-up piston 80 from being positioned on the transmission TM side (left side in FIG. 2) in the axial direction. It is possible to prevent St from exceeding a predetermined range. For these reasons, variations in the stroke amount St of the lockup piston 80 can be suppressed, and the responsiveness of the lockup can be further improved. Further, in the present embodiment, the lockup piston 80 is positioned by the protruding portion 92 of the sleeve 90 that is press-fitted into the hollow portion 35 of the front cover 3 as the input member, so that the damper hub 7 (outside extending portion 71 as the output member) is positioned. ) And the lock-up piston 80, the variation in the stroke amount St of the lock-up piston 80 can be further suppressed as compared with the case where the lock-up piston 80 is positioned by, for example, disposing a shim. In particular, the position of the damper hub 7 in the axial direction is such that the thrust bearing 45, the race 46, and the stator 6 disposed between the connecting member 44 that is connected to the radially inner side of the pump shell 40 and the blade support portion 61 of the stator 6. Since there may be variations due to dimensional tolerances or assembly errors of a plurality of parts such as the thrust bearing 65 and the race 66 disposed between the blade support portion 61 and the outer extension portion 71, the influence of such variations. Can be eliminated. Further, only the front cover 3 side needs to be considered as the outer periphery welding distortion of the torque converter TC, and the influence due to the distortion variation of the pump shell 40 can be eliminated.

  According to the starting device 1 of the present disclosure described above, the sleeve 90 that supports the lockup piston 80 so as to be movable in the axial direction is provided, and the sleeve 90 is provided at the center in the radial direction of the side wall portion 33 of the front cover 3. A flange-like shape that positions the lock-up piston 80 by abutting against a press-fit portion 90a that is press-fitted into the hollow portion 35 that is recessed in the axial direction, and a surface 80a opposite to the surface to which the friction material 81 of the lock-up piston 80 is attached. And a protrusion 92. For this reason, due to the protrusion 92 of the sleeve 90, the friction contact surface 81a of the friction material 81 that contacts the front cover 3 at the time of lockup, and the facing surface 33a of the front cover 3 that faces the friction contact surface 81a. It is possible to prevent the distance in the axial direction from being unnecessarily separated. Accordingly, not only the variation in the distance between the friction contact surface 81a of the friction material 81 and the opposed surface 33a of the front cover 3, that is, the variation in the stroke amount St of the lock-up piston 80, but also the aim of the stroke amount St. The value can also be set small. Therefore, the responsiveness of lockup can be further improved.

  Further, according to the starting device 1 of the present disclosure, the sleeve 90 has the end on the press-fit portion 90a side in the axial direction closed by the end wall portion 94, and therefore, when the sleeve 90 is press-fitted into the hollow portion 35. It is possible to prevent the generated burrs or the like from entering the lockup chamber 85 or the torus (annular flow path) as foreign matter.

  In the above-described starting device 1, the protruding portion 92 is provided on the outer peripheral surface of the sleeve 90 and the washer 98 is disposed adjacent to the protruding portion 92. However, the invention is not limited thereto, and the washer 98 may not be disposed. . In this case, the above-described distance Lc may be omitted and the press-fit height Ph may be set.

  In the above-described starting device 1, the end of the sleeve 90 on the press-fit portion 90 a side in the axial direction is closed by the end wall portion 94. However, the present invention is not limited to this, and the end wall portion 94 is not provided. The end on the press-fit portion 90a side may be open. However, in order to prevent foreign matters such as burrs from entering, it is preferable that the end on the press-fit portion 90a side is closed.

  In the above-described starting device 1, the lockup piston 80 is positioned by the protrusion 92 provided on the outer peripheral surface of the sleeve 90. However, the present invention is not limited to this, and the lockup piston 80 abuts against the surface 80 a of the lockup piston 80. Any device that positions the piston 80 may be used. FIG. 6 is a partial cross-sectional view of a starting device 1B according to another embodiment. In the starting device 1B of FIG. 6, the same components as those of the starting device 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the starting device 1B of FIG. 6, the sleeve 90B is illustrated in which the end on the press-fit portion 90a side is opened. In the sleeve 90B, a groove portion 95 extending in the circumferential direction is provided on the outer peripheral surface near the end opposite to the press-fit portion 90a. The groove 95 is provided with a snap ring 99 that is attached by elastic force. The outer peripheral side of the snap ring 99 is exposed from the groove 95, and the end surface 99a is the engine EG side (the right side in FIG. 6) of both end surfaces in the axial direction of the starting device 1. The end surface 99a abuts on the outer surface 80a of the lockup piston 80, whereby the lockup piston 80 can be positioned. For this reason, similarly to the above-described embodiment, variation in the stroke amount St of the lockup piston 80 can be suppressed, and the responsiveness of the lockup can be further improved. When positioning the lock-up piston 80 with the snap ring 99, the press-fit height Ph is set using a distance Ld2 from the end surface 91b of the sleeve 90B to the end surface 99a of the snap ring 99 instead of the above-described distance Ld. That's fine. That is, in the case of FIG. 6, the press-fit height Ph may be set to a value (La + Lb + Ld2 + δ).

  In the above-described starting devices 1 and 1B, the front cover 3 and the pump impeller 4 (pump shell 40) are joined via the arc welded portion 49, but the invention is not limited to this, and the laser welded portion. It is good also as what is joined via other welding parts.

  As described above, the starting device (1, 1B) of the present disclosure includes the input member (3) and the output member (7) to which power is transmitted from the input member (3) via the fluid transmission device (TC). And a lockup clutch (8) capable of releasing the lockup and connecting the input member (3) and the output member (7). The lock-up clutch (8) is a single-plate clutch having a lock-up piston (80) and a friction material (81) attached to the surface of the lock-up piston (80) on the input member (3) side. The input member (3) has an annular side wall portion (33) extending in the radial direction, and a hollow portion (35) recessed in the axial direction is provided at the radial center of the side wall portion (33). The lock-up piston (80) A cylindrical member (90, 90B) that is movably supported in the axial direction of the writing / starting device (1) is provided, and the cylindrical member (90, 90B) is formed in the recess (35) of the input member (3). The lock-up piston (80) is brought into contact with the press-fit portion (90a) press-fitted into the surface and the surface (80a) opposite to the surface to which the friction material (81) of the lock-up piston (80) is attached. It has a gist of having positioning parts (92, 99) for positioning.

  The starting device (1, 1B) of the present disclosure includes a cylindrical member (90, 90B) that supports the lock-up piston (80) so as to be movable in the axial direction of the starting device (1). 90B) is a friction between a press-fit portion (90a) press-fitted into a hollow portion (35) recessed in the axial direction at the radial center of the side wall portion (33) of the input member (3) and the lock-up piston (80). A positioning portion (92, 99) for positioning the lock-up piston (80) in contact with the surface (80a) opposite to the surface to which the material (81) is attached; For this reason, the positioning portion (92, 99) of the cylindrical member (90, 90B) and the friction contact surface (81a) of the friction material (81) that contacts the input member (3) at the time of lockup, and the friction It is possible to prevent the distance in the axial direction between the contact surface (81a) and the facing surface (33a) of the input member (3) facing the surface from being unnecessarily separated. Therefore, the distance between the friction contact surface (81a) of the friction material (81) attached to the lockup piston (80) and the opposing surface (33a) of the input member (3), that is, the lockup piston (80) is increased. Since the variation in the stroke amount (St) can be suppressed, the responsiveness of the lockup can be further improved.

  In such a starting device (1) of the present disclosure, the cylindrical member (90) may be configured such that an end portion on the press-fit portion (90a) side in the axial direction is closed.

  Further, in the starting device (1) of the present disclosure, the cylindrical member (90) has a protruding portion (92) protruding in a flange shape radially outward from the outer peripheral surface, and the protruding portion (92) The surface (92a) on the press-fit portion (90a) side in the axial direction may be in contact with the opposite surface (80a) of the lock-up piston (80) and function as the positioning portion.

  In the starting device (1) of the present disclosure, a groove portion (95) extending in the circumferential direction is formed on the outer peripheral surface of the cylindrical member (90B) so that the outer peripheral side is exposed from the groove portion (95). The elastic ring member (99) is attached to the groove part (95) by elastic force, and a portion of the elastic ring member (99) exposed from the groove part (95) is the press-fitting part (90a in the axial direction). ) Side may be in contact with the opposite surface (80a) of the lock-up piston (80) to function as the positioning portion.

  Moreover, the manufacturing method of the starting device (1, 1B) of the present disclosure includes an input member (3) and an output member (7) to which power is transmitted from the input member (3) via the fluid transmission device (TC). And a lockup clutch (8) capable of releasing the lockup and connecting the input member (3) and the output member (7), the lockup clutch (8), A single-plate clutch having a lock-up piston (80) and a friction material (81) attached to a surface of the lock-up piston (80) on the input member (3) side, the input member (3) The lockup piston (80) has an annular side wall portion (33) extending in the radial direction, and a hollow portion (35) recessed in the axial direction is provided at the radial center of the side wall portion (33). In the axial direction of the starting device (1) A positioning part (a positioning unit) that supports the movable member and positions the lock-up piston (80) by contacting the surface (80a) opposite to the surface to which the friction material (81) of the lock-up piston (80) is attached. 92, 99) is a method of manufacturing a starting device (1) including a cylindrical member (90, 90B), and (a) the input member facing the friction material (81) of the lock-up piston (80). A first distance (La) in the axial direction between the opposing surface (33a) of (3) and the outer surface (33b) of the side wall portion (33) of the input member (3), and the lock-up piston (80) A second distance (Lb) in the axial direction between an end surface (81a) of the friction material (81) and a surface (80a) opposite to a surface to which the friction material (81) is attached; Tubular member 90) a third distance (Ld) in the axial direction between the end surface (91b) on one end side of 90) and the contact surface (92a, 99a) contacting the lock-up piston (80) in the positioning portion (92, 99). And (b) assembling the lock-up piston (80) to the cylindrical member (90, 90B), and the outer surface (33b) of the side wall portion (33) of the input member (3). A step of pressing the cylindrical member (90, 90B) from the one end side while pressing and inserting into the recess (35) of the input member (3), and (c) the input member (3). Joining the structural member (41) of the fluid transmission device (TC) by welding, and in the step (b), the side wall portion (33) of the input member (3) after the press-fitting is performed. The cylindrical shape from the outer surface (33b) The press-fit height (Ph) to the end surface (91b) on the one end side of the member (90, 90B) is the first distance (La), the second distance (Lb), and the third distance (Ld). And the amount of deformation (δ) in the axial direction of the input member (3) assumed by the welding distortion in the step (c), and the stroke amount (St) of the lock-up piston (80) in the axial direction. The gist is that the cylindrical member (90, 90B) is press-fitted into the recess (35) so that

  According to the manufacturing method of the starting device (1, 1B) of the present disclosure, in the step of pressing the cylindrical member (90, 90B) from one end side and press-fitting into the recess (35) of the input member (3), press-fitting The press-fitting height (Ph) from the outer surface (33b) of the side wall portion (33) of the input member (3) to the end surface (91b) on one end side of the cylindrical member (90, 90B) is the input member (3). The first distance (La) in the axial direction between the opposing surface (33a) of the input member and the outer surface (33b) of the side wall (33) of the input member (3), and the end surface of the friction material (81) of the lockup piston (80) (81a) and the second distance (Lb) in the axial direction between the surface (80a) opposite to the friction material (81), the end surface (91b) at one end of the cylindrical member (90), and the positioning portion (92, 99) at the contact surface (92a, abutting against the lock-up piston (80) 9a) and the third distance (Ld) in the axial direction, the deformation amount (δ) in the axial direction of the input member (3) assumed due to welding distortion, and the stroke amount of the lock-up piston (80) in the axial direction ( The cylindrical member (90, 90B) is press-fitted into the recess (35) so as to be the sum of St). For this reason, even if deformation due to welding distortion occurs, the distance between the friction contact surface (81a) of the friction material (81) attached to the lockup piston (80) and the opposing surface (33a) of the input member (3) is reduced. Since variations, that is, variations in the stroke amount of the lockup piston (80) can be suppressed, the responsiveness of the lockup can be further improved.

  As mentioned above, although the form for implementing this indication was demonstrated, this indication is not limited to such embodiment at all, and can be implemented with various forms within the range which does not deviate from the gist of this indication. Of course.

  The present disclosure can be used in the starter manufacturing industry.

  1, 1B Starting device, 3 Front cover, 4 Pump impeller, 5 Turbine runner, 6 Stator, 7 Damper hub (output member), 8 Lock-up clutch, 9 Fluid chamber, 10 Damper device, 11 Drive member, 12 First intermediate member , 14 Second intermediate member, 15 Driven member, 31 Center piece, 32 Cover body, 33 Side wall portion, 33a Opposing surface, 33b Outer surface, 34 Outer tube portion, 34a End surface, 35 Recessed portion, 39 Nut, 40 Pump shell, 41 Pump blade, 42a end face, 44 connecting member, 45, 65 thrust bearing, 46, 66 race, 49 arc welded part, 50 turbine shell, 51 turbine blade, 60 stator blade, 61 blade support part, 62 one-way clutch, 70 cylindrical Part, 71 Outer extension part 80 lock-up piston, 80a surface, 81 friction material, 81a friction contact surface, 85 lock-up chamber, 90, 90B sleeve, 90a press-fit portion, 91 side wall portion, 91a oil passage, 91b end surface, 92 projecting portion, 92a end surface, 94 end wall, 95 groove, 98 washer, 99 snap ring, 99a end surface, CA center shaft, EG engine, IS input shaft, TC torque converter (fluid transmission), TM transmission, SP1 first spring, SP2 second Spring, SP3 Third spring.

Claims (5)

An input member, an output member to which power is transmitted from the input member via a fluid transmission device, a lockup clutch for connecting the input member and the output member, and a lockup clutch capable of releasing the lockup; A starting device comprising:
The lock-up clutch is a single-plate clutch having a lock-up piston and a friction material attached to the surface of the lock-up piston on the input member side,
The input member has an annular side wall portion extending in the radial direction, and a hollow portion that is recessed in the axial direction is provided at the radial center of the side wall portion,
A cylindrical member that supports the lock-up piston so as to be movable in the axial direction of the starting device;
The cylindrical member contacts the press-fitting part press-fitted into the hollow part of the input member and the surface of the lock-up piston opposite to the surface to which the friction material is attached to position the lock-up piston. A starting device having a positioning part. The starting device according to claim 1,
The cylindrical member is closed at an end portion on the press-fitting portion side in the axial direction. The starting device according to claim 1 or 2,
The cylindrical member has a protruding portion protruding in a flange shape radially outward from the outer peripheral surface,
A surface of the protruding portion on the press-fit portion side in the axial direction contacts the opposite surface of the lockup piston and functions as the positioning portion. The starting device according to claim 1 or 2,
A groove portion extending in the circumferential direction is formed on the outer peripheral surface of the cylindrical member,
An elastic annular member attached to the groove portion by elastic force so that the outer peripheral side is exposed from the groove portion;
The part exposed from the groove of the elastic annular member abuts against the opposite surface of the lock-up piston on the press-fit portion side in the axial direction and functions as the positioning portion. An input member, an output member to which power is transmitted from the input member via a fluid transmission device, a lockup clutch for connecting the input member and the output member, and a lockup clutch capable of releasing the lockup; With
The lock-up clutch is a single-plate clutch having a lock-up piston and a friction material attached to the surface of the lock-up piston on the input member side,
The input member has an annular side wall portion extending in the radial direction, and a hollow portion that is recessed in the axial direction is provided at the radial center of the side wall portion,
The lockup piston is supported so as to be movable in the axial direction of the starting device, and has a positioning portion that contacts the surface of the lockup piston opposite to the surface to which the friction material is attached to position the lockup piston. A method of manufacturing a starting device comprising a cylindrical member,
(A) a first distance in the axial direction between a facing surface of the input member facing the friction material of the lockup piston and an outer surface of the side wall portion of the input member, and an end surface of the friction material of the lockup piston And the surface opposite to the surface on which the friction material is attached, the second distance in the axial direction, the end surface on the one end side of the cylindrical member in the axial direction, and the positioning portion abut on the lockup piston Measuring a third distance in the axial direction with the contact surface;
(B) The lock-up piston is assembled to the cylindrical member, and the cylindrical member is pressed from the one end side while supporting the outer surface of the side wall portion of the input member, so that the hollow portion of the input member Press-fitting process;
(C) joining the constituent members of the fluid transmission device to the input member by welding;
Including
In the step (b), the press-fitting height from the outer surface of the side wall portion of the input member after the press-fitting to the end surface on the one end side of the tubular member is the first distance and the second distance. The cylinder so as to be the sum of the third distance, the deformation amount in the axial direction of the input member assumed by the welding distortion in the step (c), and the stroke amount of the lock-up piston in the axial direction. A method for manufacturing a starter device, wherein a hollow member is press-fitted into the recess.