JP5642647B2 - Fluid transmission device for vehicles - Google Patents

Description

  The present invention relates to a fluid transmission device provided in a vehicle, and more particularly to a structure in which a damper device provided in the fluid transmission device is provided outside a pump shell.

  A vehicle fluid transmission device is known which is provided in a power transmission path between a vehicle power source and an automatic transmission and transmits torque generated by the power source to the input shaft of the automatic transmission via a fluid. It has been. For example, a fluid including a pump impeller rotated around a single axis by a driving source such as an engine, and a turbine impeller rotated around the single axis by a working fluid sent out by the pump impeller The torque converter further includes a coupling and a stator impeller that is rotatably arranged around the one axis between the pump impeller and the turbine impeller described in Patent Document 1, for example. .

  In the fluid transmission device for a vehicle as described above, an input member such as a drive plate or a damper device for inputting torque from an engine which is a driving force source of the vehicle to the pump impeller is welded to a pump shell of the pump impeller. For example, a plurality of protrusions protruding at predetermined intervals on one circumference are provided, and welding is performed with the protrusions inserted into the holes. Alternatively, the input member is fixed to the pump shell by a plurality of set bolts which are respectively screwed into a plurality of set blocks fixed at a predetermined interval on one circumference by welding or the like in the pump shell of the pump impeller. Is done.

Japanese Utility Model Publication No. 06-006796

  By the way, instead of a plurality of protrusions and a plurality of set blocks for fixing the input member, there is a single annular set member fixed to the pump shell to reduce the number of parts and the assembly man-hours. It is possible to use it. However, when such an annular set member is used, water tends to accumulate on the inner peripheral surface of the annular set member, and there is a risk of rust generation or performance degradation due to the water.

  For example, when the damper device is disposed between the front shell of the pump impeller of the fluid transmission device and the engine as described in Patent Document 1, the driven plate of the damper device is welded to the front shell by welding or the like. It is fixed to the front shell of the pump impeller by a set port that is screwed into the fixed set member. However, when the coil diameter and overall length of the coil spring held by the damper cover are set large to improve the pulsation absorbing performance of the damper device, the coil spring is held at the outer peripheral position as much as possible, and the front shell The fixed space is provided at the inner peripheral position. For this reason, the set member which screws the set bolt which fixes the inner peripheral part of the driven plate of a damper apparatus is located in the inner peripheral side comparatively among front shells. Also, it is desired to center the damper cover of the damper device, and the set member is formed in an annular shape, and an annular bearing fitted to the inner periphery of the damper cover is connected to the inner periphery of the set member. It can be considered to be attached to. However, when the annular set member is positioned relatively on the inner peripheral side of the front shell and an annular bearing is attached to the inner peripheral portion of the set member, water is not supplied to the inner peripheral side of the annular set member. As a result, a space for accumulating water is formed, which may cause rust and affect the annular bearing.

  The present invention has been made in the background of the above circumstances, and an object thereof is to provide a vehicle fluid transmission device in which water does not accumulate in the annular space on the inner peripheral side of the annular set member. is there.

The present invention has been made against the background of the above circumstances. The gist of the present invention is that (a) a pump shell to which torque from a drive source is input and an inner side of the pump shell are arranged on the output side. A pump impeller having a plurality of blades arranged in a direction, a plurality of blades provided at positions facing the blades of the pump impeller, and a hub portion supporting the blades, A turbine impeller supported by a shaft end portion and rotated by receiving a working fluid sent out from the blades of the pump impeller, and transmitting the torque to the output shaft. b) An annular annular set member to which a plurality of set bolts for fixing an input member for inputting torque from the drive source is screwed is fixed to the pump shell, and (c) the annular set member The annular cell penetrates in the radial direction. Communicating passage for communicating the inner and outer circumferential surfaces of the bets member mutually are formation, it is disposed between the pump shell (d) and the drive source, the torque from the drive source A damper device for inputting to the pump shell, the damper device being wound in a coil shape and having a longitudinal shape in the circumferential direction; a damper spring accommodating the damper spring; and a shaft smaller than the diameter of the damper spring An annular damper cover having an opening on the inner peripheral side having a width dimension in the center direction, and the damper cover inserted into the damper cover from the inner peripheral opening and connected to the damper cover via the damper spring (E) an inner peripheral portion of the damper cover on the drive source side of the annular set member via an annular bearing. To inner circumference Capable is supported, in the (f) said annular set member, an inner peripheral portion of the driven plate is in that it is fixed by the plurality of set bolt.

According to the vehicle fluid transmission device configured as described above, an annular annular set in which a plurality of set bolts for fixing an input member for inputting torque from the drive source is screwed to the pump shell. The member is fixed, and the annular set member is formed with a communication passage that penetrates in the radial direction and communicates the inner peripheral surface and the outer peripheral surface of the annular set member. Since water accumulated on the peripheral surface is guided to the outer peripheral surface through the communication path, the generation of rust is preferably eliminated. Further, in the vehicle fluid transmission device including the damper device, water is prevented from being stored in the space between the annular bearing and the pump shell on the inner peripheral side of the annular set member, and the influence of water on the annular bearing is reduced. Is preferably eliminated.

Preferably, a plurality of female screw holes into which the plurality of set bolts are screwed are formed in the annular set member so as to penetrate in the axial direction.
The communication passage is formed at a position where the female screw hole is not formed in the annular set member. In this way, water accumulated on the inner peripheral surface of the annular set member does not enter the female screw hole into which the set bolt is screwed, so that the water enters the damper cover through the female screw hole. Is preferably prevented.

It is sectional drawing explaining the structure of the torque converter for vehicles which is one Example of this invention. It is a figure which expands and shows the torque converter for vehicles of FIG. 1 in a housing. It is the front view which notched the half explaining the structure of the annular set member currently fixed to the pump shell of the torque converter for vehicles of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 for explaining a through groove formed in an annular set member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating a configuration of a torque converter 10 that is a vehicle fluid transmission device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a case where the torque converter 10 is accommodated in a cylindrical housing 8 of the vehicle. Indicates the state. A torque converter 10 provided in a cylindrical housing 8 of the vehicle includes a pump impeller (pump impeller) 12, a turbine impeller (turbine runner) 14, a lockup clutch 16, a one-way clutch 18, and a stator impeller 20. The torque input from the crankshaft 22 of the engine 21 that functions as a drive source is amplified and output from the input shaft 26 of the transmission 24 that functions as the output shaft of the torque converter 10.

  The pump impeller 12 includes a disc-shaped front shell 12a and a rear shell 12b, and is connected to the crankshaft 22 of the engine 21 via a drive plate 32 and a damper device 34, and has an axis C at the same rotational speed as the crankshaft 22. There are provided a pump shell 12c that is rotated around and a plurality of pump blades 12d that are disposed on the inner periphery of the rear shell 12b so as to overlap in the circumferential direction. The turbine impeller 14 is a disc-shaped hub portion 14a that is spline-fitted to the shaft end portion of the input shaft 26 and is in contact with the front shell 12a via the sliding ring 12e so as to be relatively rotatable, and a hub portion 14a. A cylindrical shaft portion 14b that is projected from the center of the shaft and is spline-fitted to the shaft end portion of the input shaft 26, and a plurality of pieces are fixed so as to overlap the circumferential direction so as to face the pump blade 12d at the outer peripheral portion of the hub portion 14a. The turbine blade 14d is provided so as to rotate about the axis C together with the input shaft 26. The stator impeller 20 includes a disc portion 20a in which a stator blade 20d located between the pump blade 12d of the pump impeller 12 and the turbine blade 14d of the turbine impeller 14 is formed on the outer peripheral portion, and the disc portion 20a. A cylindrical portion 20b formed on the inner peripheral portion and fitted with the one-way clutch 18; a cylindrical fixed shaft 28 which is a non-rotating member fixed to the housing 8; It is rotatably supported around C. A front-side first draft bearing 44 is interposed between the stator impeller 20 and the hub portion 14a of the turbine impeller 14, and a rear-side second draft bearing 46 is provided between the stator impeller 20 and the rear shell 12b. Therefore, the position of the stator impeller 20 in the axial direction C is determined.

  In the housing 8, a partition wall 24 a is provided for separating a space for housing the transmission 24 and a space for housing the torque converter 10, and a hydraulic pump 30 is provided in the partition wall 24 a. The hydraulic pump 30 includes a pump body 30a fixed to the partition wall 24a, a pump cover 30b fixed to the pump body 30a, an inner ring gear 30c and an outer ring gear 30d that are rotatably accommodated in a space formed therebetween and mesh with each other. And the inner ring gear 30c is fitted to the shaft end of the cylindrical shaft 12f projecting from the inner peripheral portion of the rear shell 12b of the pump impeller 12 so that the hydraulic pump 30 does not rotate relative to the engine 21. Are driven to rotate. The hydraulic pump 30, that is, the pump body 30a protrudes conically from the partition wall 24a toward the torque converter 10 side, that is, the engine 21 side or the input side. The input shaft 26 protrudes into the space for accommodating the torque converter 10 in a state of being rotatably supported by the partition wall 24 a via a bearing (not shown), and supports the torque converter 10.

  The outer peripheral portion of the rear shell 12b constituting the output side of the pump shell 12c of the pump impeller 12, that is, the transmission 24 side, and the outer peripheral portion of the front shell 12a constituting the input side, that is, the engine 21 side are the output side, that is, the transmission 24 side. It is offset so that it sticks out. For this reason, the inner peripheral portion of the rear shell 12b has a concave shape that is recessed toward the input side, and receives the tip of the pump body 30a. That is, the front end portion of the pump body 30a overlaps with the outer peripheral portion of the rear shell 12b in the radial direction. Thereby, space efficiency is improved and the dimension of the axial center C direction of the torque converter 10 is shortened.

  For this reason, since the pump blade 12d of the pump impeller 12 disposed on the inner wall surface of the outer peripheral portion of the rear shell 12b protruding toward the transmission 24 is also offset to the output side, the stator blade 20d of the stator impeller 20 The turbine blade 14d of the turbine impeller 14 is similarly offset to the output side, that is, the transmission 24 side while maintaining a certain relative positional relationship with the pump blade 12d of the pump impeller 12. In the present embodiment, the disk portion 20a of the stator impeller 20 is formed in a conical shape whose outer peripheral portion is located closer to the transmission 24 than the cylindrical portion 20b, so that the stator blade 20d of the stator impeller 20 is The one-way clutch 18 is offset to the output side so as not to overlap in the radial direction. Further, the hub portion 14 a of the turbine impeller 14 is formed in a conical shape whose outer peripheral portion overlaps with the one-way clutch 18 in the radial direction, so that the turbine blade 14 d of the turbine impeller 14 is in relation to the one-way clutch 18. Although they do not overlap in the radial direction, they are offset toward the output side so that they partially overlap.

  The lock-up clutch 16 has a central portion that slides on the outer peripheral surface of the cylindrical shaft portion 14b that protrudes from the center of the hub portion 14a of the turbine impeller 14 that is fitted to the shaft end portion of the input shaft 26 so as not to be relatively rotatable. A disk-like piston 16a that is engaged and engages with an engaging protrusion 14e that protrudes from the turbine shell 14c of the turbine impeller 14 so as not to rotate relative to the outer periphery of the piston 16a, or the front An annular friction member 16b that is fixed to a portion of the inner side of the shell 12a facing the outer peripheral portion thereof and directly connects the turbine impeller 14 and the pump impeller 12 to each other by a frictional force is provided. As described above, the outer peripheral portion of the front shell 12a constituting the input side of the pump shell 12c of the pump impeller 12, that is, the engine 21 side, is offset so as to protrude toward the output side, that is, the transmission 24 side. Similarly, the outer peripheral portion of 16a is offset so as to protrude to the output side, that is, the transmission 24 side, and interference with the front shell 12a and the turbine impeller 14 is prevented. Thus, the outer peripheral portion of the piston 16a of the lockup clutch 16 and the front shell 12a are arranged such that the outer peripheral portion of the piston 16a of the lockup clutch 16 and the friction material 16b fixed thereto overlap the one-way clutch 18 in the radial direction. Is offset to the output side.

  A drive plate 32 fixed to the shaft end of the crankshaft 22 of the engine 21 includes a disk-shaped portion 32a and a ring gear 32b fixed to the outer peripheral portion of the disk-shaped portion 32a to mesh with a pinion of a starter motor (not shown). It has. The damper device 34 is provided between the drive plate 32 and the front shell 12a constituting the front portion of the pump shell 12c.

  The damper device 34 has an inner peripheral portion fixed to the front shell 12 a via an annular set member 35 concentric with the axis C, and is wound in a coil shape so as to be longitudinal in the circumferential direction of the damper device 34. Disc-shaped driven plate in which notches 38a opened on the outer peripheral side for receiving two kinds of large-diameter damper springs 36a and small-diameter damper springs 36b that are concentrically formed with each other are formed at a plurality of positions on the outer peripheral portion at equal intervals. 38 and the annular set member 35 fixed to the front shell 12a, and is rotatably supported around the axis C via an annular bearing 40 and fixed to the disk-like portion 32a of the drive plate 32. A cylindrical space extending in the circumferential direction for receiving the large-diameter damper spring 36a and the small-diameter damper spring 36b so as to cover the outer circumference. Damper covers 42 formed at equal intervals in a plurality of circumferential directions, and a large-diameter damper spring 36a and a small-diameter damper spring 36b are circumferentially arranged in accordance with a rotational phase shift between the driven plate 38 and the damper cover 42. That is, by compressing in the longitudinal direction, the pulsation of torque transmitted from the engine 21 is absorbed.

  The damper cover 42 includes a spring housing space S composed of the plurality of columnar spaces and a communication space that communicates the plurality of columnar spaces in the circumferential direction, and an axial center C direction that is smaller than the diameter of the large-diameter damper spring 36a. And an inner circumferential side opening K having a communication space that opens to the inner circumferential side. The outer peripheral portion of the driven plate 38 is inserted into the opening K, and a pair of spring steel sealing members 50 fixed by rivets 48 on both surfaces of the driven plate 38 seal the opening K. In the spring accommodating space S, a lubricant such as grease is enclosed.

  As described above, the outer peripheral portion of the front shell 12a constituting the input side of the pump shell 12c of the pump impeller 12, that is, the engine 21 side is offset so as to protrude toward the output side, that is, the transmission 24 side. An annular space X is formed between the outer peripheral portion of the shell 12 a and the drive plate 32 on the input side, that is, the engine 21 side, and the damper device 34 is disposed in the annular space X. The damper device 34 has a cylindrical shaft portion in which the center position PD in the direction of the axis C passing through the centers of the large-diameter damper spring 36a and the small-diameter damper spring 36b is located at the shaft end of the input shaft 26 and the inner peripheral portion of the turbine impeller 14. As is clear from the fact that it is located on the output side from the input side end face of 14b and the input side tip of the inner peripheral part of the front shell 12a, the shaft end part of the input shaft 26 and the turbine impeller 14 The peripheral portion, that is, the cylindrical shaft portion 14b and the inner peripheral portion of the front shell 12a are positioned so as to overlap in the radial direction. Thereby, the inner peripheral part of the front shell 12a constituting the input side of the pump shell 12c protrudes from the outer peripheral part to the input side, that is, the engine 21 side, and substantially overlaps the damper device 34 in the radial direction.

  As a result, the damper device 34 can have a larger coil diameter and a larger coil diameter by positioning the large-diameter damper spring 36a and the small-diameter damper spring 36b on the outer peripheral side as compared with the conventional one. It has a high damper performance with a large torsion angle and softness against torque changes. Since the damper device 34 has such a high damper performance, the torque vibration is efficiently reduced, so that the engine 21 can be operated in a low rotation and high load operation region with good combustion efficiency. Further, during traveling in the directly connected state by the lock-up clutch 16, the torque converter 10 is supported by the input shaft 26 via the piston 16a and the turbine impeller 14, but the damper device 34 and the input shaft 26 overlap. Therefore, when a disturbance such as a shake is input, the shake of the damper device 34 is suppressed and the damper device 34 is supported more stably. Further, as described above, the damper device 34 is positioned such that the center position PD in the axial center C direction overlaps the shaft end of the input shaft 26 and the cylindrical shaft portion 14b of the turbine impeller 14 in the radial direction. Therefore, high workability can be obtained when the torque converter 10 is supported and the one-way clutch 18 and the input shaft 26 are fitted.

  3 is a front view of the annular set member 35 fixed to the front shell 12a by welding as viewed from the engine 21 side, and FIG. 4 is a cross-sectional view taken along the line III-III of FIG. FIG. 3 and 4, the annular set member 35 has a plurality of female screw holes 54 through which set bolts 52 passed through the driven plate 38 are screwed in order to fix the driven plate 38 to the front shell 12a. A plurality of interference prevention holes 56 for preventing interference with the rivet 48 are formed as blind holes. A through groove 58 penetrating in the radial direction is formed at a position on the surface of the annular set member 35 on the front shell 12a side where the interference prevention hole 56 is provided. The through groove 58 discharges water stored in the annular space SS opened to the inner peripheral side between the outer peripheral surface of the annular set member 35 and the annular bearing 40 and the front shell 12a to the outer peripheral side by centrifugal force or gravity. It functions as a communication path.

  As described above, according to the torque converter 10 of the present embodiment, the plurality of set bolts for fixing the driven plate 38 (input member) for inputting torque from the engine 21 to the pump shell 12c (front shell 12a). An annular set member 35 to which 52 is screwed is fixed, and the annular set member 35 penetrates in the radial direction and communicates with the inner peripheral surface and the outer peripheral surface of the annular set member. Since the (communication path) 58 is formed, water accumulated on the inner peripheral surface of the annular set member 35 is guided to the outer peripheral surface through the communication groove 58, so that the annular space SS on the inner peripheral side of the annular set member 35. Thus, water does not accumulate, and the risk of rusting and performance degradation is preferably eliminated.

  Further, according to the present embodiment, the damper device 34 is disposed between the engine 21 and the pump shell 12c and inputs the torque from the engine 21 to the pump shell 12c. The damper springs 36a and 36b, which are wound in a circular shape and have a longitudinal shape in the circumferential direction, accommodate the damper springs 36a and 36b, and have a width dimension in the axial direction smaller than the diameter of the damper springs 36a and 36b. An annular damper cover 42 having an inner peripheral side opening K that opens to the inner peripheral side, and is inserted into the damper cover 42 from the inner peripheral side opening K and input to the damper cover 42 through damper springs 36a and 36b. A disc-shaped driven plate 38 to which torque is transmitted, and is formed on the inner peripheral portion of the damper cover 42 on the engine 21 side. The boss portion 42b is rotatably supported by the inner peripheral portion of the annular set member 35 via the annular bearing 40. The inner peripheral portion of the driven plate 38 is set on the annular set member 35. It is fixed with bolts 52. In this way, in the torque converter 10 including the damper device 34, water is prevented from being stored in the annular space SS between the annular bearing 40 and the pump shell 12c on the inner peripheral side of the annular set member 35. The influence of water on the annular bearing 40 is preferably eliminated.

  Further, according to the torque converter 10 of the present embodiment, the annular set member 35 is formed with a plurality of female screw holes 54 through which the plurality of set bolts 52 are screwed in the axial direction. Since the groove (communication path) 58 is formed in the annular set member 35 at a position where the female screw hole 54 is not formed, the water accumulated on the inner peripheral surface of the annular set member 35 is transferred to the set bolt 52. Since it does not enter the screwed female screw hole 54, the water is preferably prevented from entering the damper cover 42 through the female screw hole 54.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the above-described embodiment, the through groove 58 for discharging the water accumulated in the annular space SS is formed to penetrate the contact surface of the annular set member 35 to the pump shell 12c in the radial direction. Instead of the through groove 58, a through hole that functions as a communication path may be provided in the central portion in the thickness direction of the annular set member 35.

  In the above-described embodiment, the torque converter 10 is exemplified as the vehicle fluid transmission device. However, a fluid coupling may be used.

  In the above-described embodiment, the damper device 34 has two types of large-diameter damper springs 36a and small-diameter damper springs 36b. However, the damper device 34 has one type or three types of damper springs. Other structures or types may be used such as those having different sizes and positions.

  In the above-described embodiment, the blade 12d of the pump impeller 12, the blade 14d of the turbine impeller 14, and the blade 20d of the stator impeller 20 are offset to the output side. However, the offset amount is not necessarily limited to the stator impeller. The blade 20d of the vehicle 20 may not be offset to a position where it does not overlap the one-way clutch 18.

  The tubular set member 34 described above may be configured by combining a plurality of arcuate members divided in the circumferential direction. In this case, the communication path is formed by a gap formed between the arcuate members.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: Torque converter (Vehicle fluid transmission device)
12: Pump impeller 12c: Pump shell 14: Turbine impeller 16: Lock-up clutch 20: Stator impeller 21: Engine (drive source)
34: damper device 35: annular set members 36a, 36b: damper spring 38: driven plate (input member)
40: annular bearing 42: damper cover 52: set bolt 54: female screw hole 58: through groove (communication path)
SS: annular space S: spring accommodating space K: inner peripheral side opening

Claims (2)

A pump impeller having a pump shell to which torque from a driving source is input and a plurality of blades provided in the circumferential direction on the output side of the inside of the pump shell, and facing the blades of the pump impeller A turbine impeller having a plurality of blades provided at positions and a hub portion supporting the blades, supported by the shaft end portion of the output shaft, and rotated by receiving a working fluid sent from the blades of the pump impeller A vehicle fluid transmission device for transmitting the torque to the output shaft,
An annular annular set member to which a plurality of set bolts for fixing an input member for inputting torque from the drive source is screwed is fixed to the pump shell,
The annular set member is formed with a communication passage that penetrates in the radial direction and communicates the inner peripheral surface and the outer peripheral surface of the annular set member with each other .
A damper device disposed between the drive source and the pump shell to input torque from the drive source to the pump shell;
The damper device includes a damper spring wound in a coil shape and having a longitudinal shape in the circumferential direction, and the damper spring. The damper device has a width dimension in an axial direction smaller than the diameter of the damper spring and has an inner circumference. An annular damper cover having an inner peripheral side opening that opens to the side, and a disk shape that is inserted into the damper cover from the inner peripheral side opening and to which torque input to the damper cover is transmitted via the damper spring With a driven plate of
An inner peripheral portion of the damper cover on the drive source side is rotatably supported by an inner peripheral portion of the annular set member via an annular bearing,
The vehicle fluid transmission device , wherein an inner peripheral portion of the driven plate is fixed to the annular set member by the plurality of set bolts . In the annular set member, a plurality of female screw holes into which the plurality of set bolts are screwed are formed penetrating in the axial direction,
The vehicular fluid transmission device according to claim 1 , wherein the communication path is formed at a position where the female screw hole is not formed in the annular set member.

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