JP2011012714A - Damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper which can easily be assembled while suppressing the occurrence of strain to an outer case in assembling.SOLUTION: A damper 14 includes an outer cover 23 which has a front cover 21 and a rear cover 22 and in which a lubricant oil accommodation chamber 24 for accommodating liquid is formed by combining the covers 21, 22 together. The damper device 25, a limiter mechanism 26, a first plate 32 with has a first collar portion 32c located at the front side of the limiter mechanism 26, and a second plate 33 with a second collar portion 33c located at the rear side of the limiter mechanism 26 are provided in the outer cover 23. The limiter mechanism 26 includes a first limiter plate 50, which is an input side on the torque transmission path, a second limiter plate 51, which is an output side on the torque transmission path, and a limiter disc spring 53 for pressing each of the limiter plates 50, 51 in a contact state.

Description

  The present invention relates to a wet damper capable of absorbing torque vibration generated by a power source such as an engine and having a torque limiter function.

  Generally, a damper for absorbing torque vibration generated by a power source such as an engine or an electric motor is provided in a torque transmission path in a vehicle. Such a damper is provided with a limiter mechanism that interrupts torque transmission from one side to the other side in the torque transmission path when a large torque is generated in the power source (see Patent Document 1).

  The damper described in Patent Document 1 (hereinafter referred to as “conventional damper”) is a wet damper mounted on a so-called hybrid vehicle including an engine and an electric motor as power sources. That is, as shown in FIG. 7, the conventional damper is fixed to the bottom side of the front cover (first cover) 101 connected to the output side of the engine by welding and the outer peripheral side end of the front cover 101 by welding. The outer case (housing) 103 is configured with a rear cover (second cover) 102 having a substantially annular shape in plan view. The outer case 103 is filled with lubricating oil as a liquid. A sleeve 104 protruding rearward from the rear cover 102 is provided inside the rear cover 102 in the radial direction, and a front end portion of an input shaft (output member) 105 of a planetary gear mechanism (not shown) is inserted into the outer case 103. Has been.

  Further, in the outer case 103, a substantially cylindrical hub 106 supported so as to be integrally rotatable with the input shaft 105 of the planetary gear mechanism, a damper device 107 disposed on the radially outer side of the hub 106, A limiter mechanism 108 is provided on the outer side of the damper device 107 in the radial direction. The damper device 107 includes an annular central plate 109 to which torque from a power source is transmitted via a limiter mechanism 108 and an annular intermediate member 110 that is supported by the hub 106 so as to be integrally rotatable. Yes. Further, between the central plate 109 and the intermediate member 110 in the torque transmission path, there is provided a torque absorbing means 112 having a damper spring 111 as an elastic member that is arranged in a stretchable manner along the circumferential direction. .

  The limiter mechanism 108 is disposed between an annular disc spring (limiter urging means) 113 supported by a radially outer portion of the rear cover 102, and the radially outer portion of the disc spring 113 and the central plate 109. The limiter plate 114 is provided with a biasing force from the disc spring 113 toward the center plate 109. In addition, friction materials 115 and 116 are respectively provided on the rear side facing the limiter plate 114 and the front side facing the radial outer side at the bottom of the front cover 101 at the radially outer portion of the central plate 109. Yes. The central plate 109 is pressed against the limiter plate 114 by the biasing force from the disc spring 113 through the friction material 115 and presses the bottom of the front cover 101 through the friction material 116. Therefore, when the outer case 103 rotates, a frictional force is generated between the friction material 115 and the limiter plate 114, and between the friction material 116 and the front cover 101, and the central plate 109 is moved together with the outer case 103. Rotate.

  When the torque from the power source does not reach the predetermined torque, the torque from the power source is applied to the input shaft 105 of the planetary gear mechanism via the outer case 103, the limiter mechanism 108, the damper device 107, and the hub 106. Communicated. On the other hand, when an excessive torque is generated when the engine travels or the engine is started using an electric motor, and the torque exceeds a predetermined torque, the limiter mechanism 108 and the damper plate 107 have a central plate 109. Slip occurs. In other words, when a torque having a force larger than the frictional force generated between the limiter mechanism 108 and the damper device 107 is input to the conventional damper, an excessive torque is transmitted between the limiter mechanism 108 and the damper device 107. It was cut off.

JP 2008-274968 A

  By the way, when the outer case 103 is assembled in the conventional damper, the front cover 101 is welded to the rear cover 102 in a state where the damper device 107 and the limiter mechanism 108 are accommodated in the rear cover 102. At this time, a forward biasing force from the disc spring 113 of the limiter mechanism 108 is applied to the front cover 101 via the limiter plate 114 and the center plate 109. Therefore, in order to maintain the positional relationship between the covers 101 and 102 in the front-rear direction in a predetermined relationship, the front cover 101 is pressed against the rear cover 102 while the radially outer portion of the front cover 101 is placed on the radially outer portion of the rear cover 102. Need to be welded. Therefore, there has been a problem that the assembling of the outer case 103 is very troublesome as much as it is necessary to apply a pressing force to the front cover 101 or the rear cover 102 when the covers 101 and 102 are assembled.

Further, when the outer case 103 is assembled, the front cover 101 is pressed against the rear cover 102 side, so that the front cover 101 may be distorted.
This invention is made | formed in view of such a situation, The objective is to provide the damper which can be assembled easily, suppressing that a distortion generate | occur | produces in an outer case at the time of an assembly.

  In order to achieve the above object, the invention according to claim 1 relating to the damper is disposed in a torque transmission path for transmitting torque from a power source to an output member that rotates about a predetermined rotation axis. A damper having a first cover and a second cover disposed along the rotation axis, wherein a liquid storage chamber for storing a liquid is formed by combining the covers; and the rotation axis is A housing that rotates in the center, a damper device that is disposed in the liquid storage chamber and can absorb torque fluctuation transmitted through the housing, and is disposed in the liquid storage chamber and serves as an input side in the torque transmission path An input side portion, an output side portion which is disposed so as to face the input side portion and which serves as an output side in the torque transmission path, and a small number of the input side portion and the output side portion. A limiter mechanism having a limiter biasing unit that applies a biasing force in a direction approaching each other, and the first cover and the first cover by the biasing force from the limiter biasing unit. The gist of the present invention is to include separation regulating means for regulating relative movement of the second cover in the direction of separating from each other.

  According to the above configuration, the relative movement of the covers in the direction of separating from each other by the urging force from the limiter urging unit of the limiter mechanism is suppressed by the separation regulating unit. That is, when the covers are combined in a state where the damper device and the limiter mechanism are accommodated in the liquid storage chamber, the relative movement of the covers in the direction away from each other in the direction along the rotation axis is suppressed by the separation restriction means. Therefore, when the covers are combined, it is not necessary to apply a pressing force to at least one of the covers in order to suppress a change in the positional relationship of the covers in the direction along the rotation axis. Therefore, the possibility that the outer case is distorted when each cover is assembled can be reduced as compared with the case where each cover is assembled while applying a pressing force to at least one of the covers. Further, the damper can be easily assembled as much as it is possible to save time and effort to apply a pressing force to at least one of the covers.

  According to a second aspect of the present invention, in the damper according to the first aspect, the separation restricting means includes a first restricting portion disposed on one side of the limiter mechanism in a direction along the rotational axis, and the rotational axis. A second restricting portion disposed on the other side of the limiter mechanism in a direction along the direction, and each restricting portion is provided so as to maintain an interval in the direction along the rotation axis. Is the gist.

  According to the said structure, the space | interval of the 1st control part arrange | positioned so that it may line up in the direction along a rotating shaft line is the urging | biasing force from the limiter urging means of the limiter mechanism arrange | positioned between them. Is maintained even if is given. Therefore, the covers do not move relative to each other in a direction away from each other by the biasing force from the limiter biasing means. That is, when the covers are combined, it is not necessary to apply a pressing force to at least one of the covers in order to suppress a change in the positional relationship of the covers in the direction along the rotation axis.

  According to a third aspect of the present invention, in the damper according to the second aspect, the separation restricting means is integrally rotatable with a downstream member located downstream of the limiter mechanism in the torque transmission path. The gist of the invention is that each of the restricting portions is supported in a state in which displacement in the direction along the rotation axis is suppressed.

  According to the said structure, the separation | spacing control means is supported in the state by which the displacement to the direction along the rotating shaft line of each control part was suppressed by the downstream member. Therefore, the urging force from the limiter urging means is not applied to each cover. Therefore, it is suppressed that the urging force in the direction in which the covers are separated from each other is applied to the covers.

  According to a fourth aspect of the present invention, in the damper according to any one of the first to third aspects, the limiter mechanism is located inside the damper device in a radial direction centered on the rotation axis. The gist is that it is arranged.

According to the said structure, compared with the case where a limiter mechanism is arrange | positioned on the outer side in radial direction rather than a damper apparatus, it can contribute to size reduction of the whole apparatus in radial direction.
According to a fifth aspect of the present invention, in the damper according to the fourth aspect, the damper further includes a connecting member that is connected to the output member in a state of being integrally rotatable in the housing, and the connecting member includes the separation regulating means. The gist is that it is supported in an integrally rotatable state.

  According to the above configuration, since the separation restricting means is supported by the connecting member, a force that separates the respective covers based on the urging force from the limiter urging means is not applied to each cover.

  A sixth aspect of the present invention is the damper according to any one of the first to fifth aspects, wherein the damper is disposed in the liquid storage chamber and is centered on the rotation axis of the housing and the output member. A hysteresis mechanism that operates when the rotation difference in the rotation direction is a predetermined rotation difference that is set in advance, and the hysteresis mechanism is more than the damper device and the limiter mechanism in the radial direction about the rotation axis. Is also arranged inside.

  According to the said structure, compared with the case where a hysteresis mechanism is arrange | positioned on the outer side in radial direction rather than a damper apparatus and a limiter mechanism, it can contribute to size reduction of the whole apparatus in radial direction.

  According to a seventh aspect of the present invention, in the damper according to the sixth aspect, a cylindrical coupling member coupled to the output member in a state of being integrally rotatable within the housing, and an outer peripheral side of the coupling member And an annular supported member supported by the connecting member so as to be integrally rotatable, and the connecting member is disposed at a position different from the supported member in a direction along the rotation axis. It has a flange part and is arranged so that an installation space is formed between the flange part and the supported member in a direction along the rotation axis, and the hysteresis mechanism is arranged in the installation space. When the rotational difference between the friction generating portion and the housing and the output member becomes the predetermined rotational difference, torque is transmitted from the housing together with the housing. A rotating part that rotates, and when the rotating part rotates together with the housing, the friction generating part exerts a frictional force that suppresses rotation of the rotating part between the rotating part and the rotating part. It is comprised so that it may generate | occur | produce.

  According to the above configuration, when the rotation difference between the housing and the output member becomes a predetermined rotation difference, a frictional force is generated between the friction generation unit and the rotation unit so as to suppress the rotation of the rotation unit and the housing. To do. Therefore, when torque fluctuation is transmitted to the housing such that the rotation difference between the housing and the output member exceeds a predetermined rotation difference, the torque fluctuation can be reduced by the hysteresis mechanism.

  According to an eighth aspect of the present invention, in the damper according to the seventh aspect, the rotating portion has a contacted portion disposed in the installation space, and the friction generating portion is along the rotation axis. A contact member that is displaceable in a direction and that contacts the contacted portion of the rotating portion, and a hysteresis that applies a biasing force to the contact member so that the corresponding contact member is pressed against the contacted portion. It is a gist to have a force means.

  According to the above configuration, the biasing force from the hysteresis biasing means of the friction generating portion is suppressed from acting on the housing. That is, the biasing force from the hysteresis biasing means suppresses the force in the direction of separating the covers from each other in the direction along the rotation axis from acting on at least one of the covers. Accordingly, it is possible to suppress the occurrence of distortion of the outer case at the time of assembly and to easily assemble.

  The invention according to claim 9 is the damper according to claim 4 or 5, wherein the damper device includes a first torque transmission portion provided in a state capable of transmitting torque to the housing, and the radial direction in the radial direction. A second torque transmitting portion arranged at the same position as the first torque transmitting portion and configured to be able to transmit torque to the output member side; the first torque transmitting portion in the circumferential direction about the rotation axis; The gist of the present invention is to have an elastic member that is arranged in a state capable of transmitting torque between the second torque transmitting portion and is elastic in the circumferential direction.

According to the above configuration, the torque fluctuation transmitted from the power source side is suitably absorbed by the expansion and contraction of the elastic member.
According to a tenth aspect of the present invention, in the damper according to the ninth aspect, the first torque transmission portion is provided in a state of being integrally rotatable with the housing, and the second torque transmission portion includes the limiter mechanism. The gist of the present invention is that the input side portions of the motor are connected in a state where torque can be transmitted.

  Generally, the damper device includes an annular drive-side member that is provided separately from the housing, and the drive-side member is fixed to the housing so as to be integrally rotatable. And the 1st torque transmission part is formed in the drive side member. However, in the present invention, the drive side member is omitted, and the first torque transmission portion is provided in the housing. For this reason, the drive-side member can be omitted, which can contribute to the downsizing of the damper in the direction along the rotation axis.

The block diagram which shows typically the hybrid system of this embodiment. Sectional drawing which shows the damper in this embodiment. The top view at the time of seeing a front cover from the rear side. The top view at the time of seeing the inside of a damper from the front cover side. The schematic plan view which shows typically a part of rotation part in a hysteresis mechanism. The schematic sectional drawing which shows the limiter mechanism in another embodiment. Sectional drawing which shows the conventional damper.

  An embodiment in which the present invention is embodied in a damper mounted on a hybrid vehicle will be described with reference to FIGS. In the following description of the present specification, “front side” indicates the right side in FIG. 2, and “rear side” indicates the left side in FIG.

  As shown in FIG. 1, a hybrid drive device 11 mounted on a hybrid vehicle is an engine 12 that is a first power source and a second power source that is driven based on electric power supplied from a power storage device (not shown). A certain electric motor 13 and a damper 14 that absorbs torque fluctuation (hereinafter referred to as “torque fluctuation”) generated between the engine 12 and the electric motor 13 are provided. Further, the hybrid drive device 11 is provided with a planetary gear mechanism 15 to which the torque from the engine 12 and the torque from the electric motor 13 transmitted through the damper 14 are transmitted.

  The planetary gear mechanism 15 includes a sun gear, a pinion gear, a planet carrier, and a ring gear (not shown), and torque from the engine 12 via the damper 14 is transmitted to the planet carrier via an input shaft 16 as an output member. The Moreover, the electric motor 13 and the sprocket 17 are connected to the ring gear side (not shown) of the planetary gear mechanism 15 in a state where torque can be transmitted. When the ring gear rotates based on the torque from at least one of the engine 12 and the electric motor 13, the torque is transmitted to a speed reduction mechanism (not shown) via the sprocket 17 and the chain 18 attached to the sprocket 17. . A generator motor 19 is connected to a sun gear (not shown) of the planetary gear mechanism 15. The generator motor 19 generates power when torque is transmitted via the sun gear, and the generated power is supplied to the power storage device via an inverter (not shown). That is, the power storage device is charged by driving the generator motor 19.

  When the engine 12 is driven, torque from the engine 12 is transmitted to the planetary gear mechanism 15 via the damper 14, and the planet carrier of the planetary gear mechanism 15 rotates. Then, the ring gear rotates based on the rotation of the planet carrier, and torque from the engine 12 side is transmitted to the sprocket 17 via the ring gear. When the sprocket 17 rotates, torque from the engine 12 side is transmitted to the drive wheels via the chain 18 and the speed reduction mechanism, and as a result, the vehicle travels. At this time, in the planetary gear mechanism 15, the sun gear also rotates based on the rotation of the planet carrier, so that the power storage device is charged by driving the generator motor 19.

  When the driving of the engine 12 is stopped and the electric motor 13 is driven, torque from the electric motor 13 is transmitted to the ring gear of the planetary gear mechanism 15 and the sprocket 17 is rotated based on the rotation of the ring gear. When the sprocket 17 rotates, torque from the electric motor 13 is transmitted to the drive wheels via the chain 18 and a speed reduction mechanism, and as a result, the vehicle travels. At this time, torque from the electric motor 13 is not transmitted to the engine 12 side. In the hybrid drive device 11, the engine 12 and the electric motor 13 may be driven together to drive the vehicle.

Next, the damper 14 of this embodiment is demonstrated based on FIGS.
As shown in FIGS. 1 and 2, the damper 14 of the present embodiment is capable of rotating the torque from the engine 12 around a predetermined rotation axis S (shown by a one-dot chain line in FIG. 2) extending in the front-rear direction. It is arranged in a torque transmission path for transmitting to the input shaft 16 of the planetary gear mechanism 15. Specifically, the damper 14 includes an outer case 23 as a housing constituted by a bottomed substantially cylindrical front cover (first cover) 21 and a substantially annular rear cover (second cover) 22 in plan view. I have. Inside the outer case 23 is a lubricating oil storage chamber 24 as a liquid storage chamber surrounded by the assembled covers 21 and 22, and the lubricating oil storage chamber 24 has a lubricating oil as a liquid. Is filled. A damper device 25, a limiter mechanism 26, and a hysteresis mechanism 27 are arranged in this order from the outer side to the inner side in the radial direction around the rotation axis S in the lubricating oil storage chamber 24.

  The front cover 21 has a configuration in which a bottom portion 21a having a substantially disc shape in plan view through which the rotation axis S passes and a cylindrical portion 21b formed so as to be centered on the rotation axis S are integrated. The front cover 21 is welded to the rear cover 22 at the rear end (first fixed portion) 21c of the cylindrical portion 21b.

  The rear cover 22 includes a cover body 22a having a substantially annular shape in plan view in which an outer portion (second fixed portion) 22d in the radial direction is welded to the rear end 21c of the cylindrical portion 21b of the front cover 21, and a diameter of the cover body 22a. This is a configuration in which a flange-like mounting portion 22b positioned on the outer side in the direction and a sleeve 22c protruding rearward from the inner side in the radial direction of the cover main body 22a are integrated. The mounting portion 22b of the rear cover 22 is connected to a crankshaft 12a (see FIG. 1) that is an output shaft of the engine 12 via a drive plate (not shown). The outer case 23 to which torque from the engine 12 is transmitted rotates about a predetermined rotation axis S along a predetermined rotation direction R (see FIG. 2).

  Further, a midway portion in the front-rear direction of the input shaft 16 of the planetary gear mechanism 15 is located in the sleeve 22 c of the rear cover 22, and the front end portion of the input shaft 16 of the planetary gear mechanism 15 is in the lubricating oil storage chamber 24. Is located. The front end portion of the input shaft 16 of the planetary gear mechanism 15 supports a hub 28 as a connecting member disposed on the outer peripheral side thereof so as to be integrally rotatable. Specifically, the hub 28 is splined to the input shaft 16 of the planetary gear mechanism 15. The hub 28 has a hub tubular portion 29 formed so as to have the rotation axis S as a center, and an outer peripheral side of the hub tubular portion 29 and a midway portion in the front-rear direction of the hub tubular portion 29. It is the structure which united the flange-shaped hub flange part 30 arrange | positioned.

  The hub flange portion 30 includes a first disc portion 30a formed on the innermost radial direction, a second disc portion 30b formed on the outer side in the radial direction of the first disc portion 30a, and a radial direction of the second disc portion 30b. It has the 3rd disk part 30c formed in an outer side. The length of the first disk part 30a in the front-rear direction is the longest among the disk parts 30a to 30c, and the length of the second disk part 30b in the front-rear direction is longer than that of the third disk part 30c. In other words, the hub flange portion 30 is formed such that its length in the front-rear direction becomes shorter as it goes radially outward.

  Further, the first disk portion 30a of the hub flange portion 30 of the hub 28 is provided with a plurality of rivets 31 (only two are shown in FIG. 2) arranged along the circumferential direction around the rotation axis S, thereby moving in the front-rear direction. The two plates 32 and 33 arranged along are fixed. That is, these plates 32 and 33 can rotate integrally with the hub 28, respectively. The first plate 32 as a supported member disposed on the front side of each of the plates 32 and 33 includes an annular first base portion 32a supported by the hub 28 and centering on the rotation axis S, and the first base portion. A first cylindrical portion 32b extending from the outer peripheral side end portion of 32a to the front side and a disk-shaped first flange portion 32c arranged radially from the front end of the first cylindrical portion 32b are integrated. The first cylindrical portion 32 b of the first plate 32 is formed so that the center thereof coincides with the rotation axis S, and is disposed on the outer side in the radial direction than the hub flange portion 30. Further, the first flange portion 32c of the first plate 32 is arranged so that a slight gap is interposed between the front surface thereof and the bottom portion 21a of the front cover 21, and lubricating oil is interposed in the gap. ing. Further, an annular hysteresis accommodating chamber 34 as an installation space is formed between the hub flange portion 30 and the first base portion 32a in the front-rear direction, and the length of the hysteresis accommodating chamber 34 in the front-rear direction is It becomes longer as it goes outward in the radial direction.

  The second plate 33 located on the rear side of the first plate 32 is formed in a substantially annular shape in plan view with the rotation axis S as the center, and the second plate 33 located on the inner side in the radial direction of the second plate 33. The base 33 a is in contact with the first base 32 a of the first plate 32. Further, the second plate 33 has an intermediate portion 33b located on the outer side in the radial direction and on the rear side of the second base portion 33a, and between the intermediate portion 33b and the cover body 22a of the rear cover 22. A slight gap is formed in the. Further, the outer portion of the second plate 33 in the radial direction with respect to the intermediate portion 33b is an annular second collar portion 33c located at substantially the same position in the front-rear direction as the second base portion 33a. Further, in the second plate 33, a plurality (two in FIG. 2) are arranged between the intermediate portion 33b and the second flange portion 33c in the radial direction at equal intervals along the circumferential direction around the rotation axis S. Through-holes 33d are formed. An annular limiter chamber 35 is formed between the flanges 32c and 33c in the front-rear direction.

  The damper device 25 is disposed in a damper accommodating chamber 36 that is formed outside the limiter accommodating chamber 35 in the radial direction in the lubricating oil accommodating chamber 24. As shown in FIGS. 2 and 3, the damper device 25 includes a plurality of (six in this embodiment) first torque transmitting portions 37 </ b> A provided on the outer side in the radial direction of the bottom portion 21 a of the front cover 21, and the rear cover 22. A plurality of (six in this embodiment) first torque transmitting portions 37B provided outside the cover body 22a in the radial direction. The first torque transmission portions 37A provided on the front cover 21 are arranged at equal intervals along the circumferential direction. The first torque transmission portions 37B provided on the rear cover 22 are arranged so as to correspond to the positions of the first torque transmission portions 37A in the circumferential direction and the radial direction, respectively. In addition, each first torque transmission portion 37A, 37B is formed with a gap 38 between the first torque transmission portions 37A, 37B adjacent to each other in the front-rear direction so as to accommodate a disc body 39a of a damper disc 39 described later. Each is configured as follows.

  Further, as shown in FIGS. 2 and 4, the damper device 25 is provided with a damper disk 39 having a substantially annular shape in plan view with the rotation axis S as the center. The damper disk 39 has an annular disk main body 39a, and the disk main body 39a is disposed in the gap 38 so as not to contact the first torque transmitting portions 37A and 37B. In such a disk main body 39a, a plurality (six in this embodiment) of spring accommodating holes 40 are formed at equal intervals in the circumferential direction at substantially the same radial position as the first torque transmitting portions 37A and 37B. Each spring accommodation hole 40 is located between the first torque transmission portions 37A and 37B adjacent to each other in the circumferential direction. In other words, the second torque transmission portion 41 is formed at substantially the same circumferential position as the first torque transmission portions 37A and 37B in the disc main body 39a. In each spring accommodating hole 40, a damper spring 42 is disposed as an elastic member that can expand and contract along the circumferential direction.

  The damper disk 39 has a plurality of (three in this embodiment) extending portions 39b extending rearward from the radial inner side of the disk main body 39a. Each of the extending portions 39b is formed so that the shape when viewed from the front-rear direction is substantially arc-shaped, and is arranged at equal intervals along the circumferential direction. That is, each extending portion 39b is arranged so as to surround the limiter accommodating chamber 35. Further, on the inner side in the radial direction of the damper disk 39, there is a support portion 43 that is supported so as to be able to rotate integrally with the damper disk 39 and that supports each first limiter plate 50 described later of the limiter mechanism 26. Each is formed.

  And when the outer case 23 rotates along the predetermined rotation direction R, each damper spring 42 is each pressed from 1st torque transmission part 37A, 37B located in the upstream in those rotation directions R. That is, each damper spring 42 receives torque from the first torque transmission portions 37A and 37B. Then, each damper spring 42 transmits each torque from the first torque transmitting portions 37A and 37B to the damper disk 39 side, so that each second torque transmission of the damper disk 39 positioned on the downstream side in the rotation direction R thereof. Each part 41 is pressed. As a result, the damper disk 39 rotates along a predetermined rotation direction R. That is, the torque from the engine 12 is transmitted to the limiter mechanism 26 via the outer case 23 and the damper device 25.

  2 and 3, the damper device 25 includes a plurality of (three in the present embodiment) formed on the bottom 21a of the front cover 21 on the inner side in the radial direction than the first torque transmission portions 37A. ) And a plurality (three in this embodiment) of convex portions 44B formed on the inner side in the radial direction with respect to each first torque transmission portion 37B in the cover main body 22a of the rear cover 22. . Each of these convex portions 44B is disposed at the same position as the corresponding convex portion 44A in the radial direction. Moreover, each convex part 44A, 44B is each arrange | positioned between the extension parts 39b adjacent to each other in the circumferential direction. That is, as shown in FIGS. 3 and 4, the convex portions 44 </ b> A and 44 </ b> B can rotate relative to the damper disk 39 in the space 45 between the extending portions 39 b adjacent to each other in the circumferential direction. .

  As shown in FIG. 2, the limiter mechanism 26 is disposed in the limiter storage chamber 35. The limiter mechanism 26 is a plurality of sheets (five sheets in FIG. 2) that are movable along the front-rear direction and supported in an integrally rotatable state by a support portion 43 that is positioned on the inner side in the radial direction of the damper disk 39. The first limiter plate (input side portion) 50 is provided. Specifically, as shown in FIGS. 2 and 3, each first limiter plate 50 is movable along the front-rear direction to the support portion 43 of the damper disk 39 via a flexible ring member 50A. Each is supported in a state. Each first limiter plate 50 is formed in an annular shape, and friction materials 52 are provided on both sides in the front-rear direction.

  Further, the limiter mechanism 26 is movable in the front-rear direction to the first cylindrical portion 32b of the first plate 32 and is supported in a state of being integrally rotatable (five in FIG. 2) second limiter plates (five). Output side) 51. Each of the second limiter plates 51 is formed in an annular shape, and is disposed between the first limiter plates 50 adjacent to each other in the front-rear direction and on the front side of the first limiter plate 50 located on the most front side. Has been. That is, each second limiter plate 51 is disposed so as to face the first limiter plate 50 adjacent in the front-rear direction.

  Further, the limiter mechanism 26 is provided with a limiter disc spring 53 as a limiter urging means supported by the first flange portion 32 c of the first plate 32. The limiter disc spring 53 applies a rearward biasing force to each of the limiter plates 50, 51. Each first limiter plate 50 is a second limiter plate 51 positioned on the front side and the rear side thereof. Are respectively pressed through the friction material 52. That is, each first limiter plate 50 is sandwiched between both second limiter plates 51 located on the front side and the rear side thereof. At this time, since the urging force from the limiter disc spring 53 to the front side is absorbed by the first flange portion 32c of the first plate 32, the urging force from the limiter disc spring 53 is applied to the front cover 21. Not. The second plate 33 absorbs the urging force from the limiter disc spring 53 applied to the second flange 33c via the limiter plates 50 and 51 to the rear side. No urging force is applied to the limiter disc spring 53.

  Therefore, in the present embodiment, the first cover 32 and the second plate 33 are moved relatively in the direction (front-rear direction) in which the front cover 21 and the rear cover 22 are separated from each other by the biasing force from the limiter disc spring 53. A separation regulating means for regulating the distance is configured. In addition, the hub 28 that supports the first plate 32 and the second plate 33 also functions as a downstream member located on the downstream side of the limiter mechanism 26 in the torque transmission path. Further, the first flange 32c of the first plate 32 functions as a first restricting portion disposed on one side (front side) of the limiter mechanism 26 in the front-rear direction, and the second flange 33c of the second plate 33 It functions as a second restricting portion disposed on the other side (rear side) of the limiter mechanism 26 in the front-rear direction.

  As shown in FIG. 2, the hysteresis mechanism 27 is arranged on the inner side in the radial direction than the limiter mechanism 26. Such a hysteresis mechanism 27 includes a friction generating portion 55 disposed in the hysteresis accommodating chamber 34. The friction generating portion 55 includes an annular friction member (contact member) 56 that is movable in the front-rear direction and supported in an integrally rotatable state with the first cylindrical portion 32b of the first plate 32, and A hysteresis disc spring 57 is provided as a hysteresis biasing means disposed on the rear side of the friction member 56. The hysteresis disc spring 57 is supported by the first base portion 32 a of the first plate 32, and applies a forward biasing force to the friction member 56.

  The hysteresis mechanism 27 directly applies torque from the outer case 23 to the hub 28 when the rotational difference θ (also referred to as “torsion angle”) between the outer case 23 and the hub 28 becomes a predetermined rotational difference θth. A rotating portion 58 is provided for enabling transmission (see FIG. 5). As shown in FIGS. 2 and 3, the rotating portion 58 includes an annular hysteresis plate 59 that is supported by the bottom portion 21 a of the front cover 21 so as to be integrally rotatable, and on the outer peripheral side of the hysteresis plate 59. A plurality (12 in the present embodiment) of engaging recesses 60 formed at equal intervals along the circumferential direction centered on the rotation axis S are formed.

  The rotating portion 58 is provided with a hysteresis washer 61 disposed on the front side of the friction member 56 in the hysteresis accommodating chamber 34, and the hysteresis washer 61 can rotate relative to the hub 28. Is arranged in. Further, the hysteresis washer 61 has a washer body 61a as an abutted portion having an annular shape, and a plurality of engagement pieces 61b individually corresponding to the respective engagement recesses 60 from the outer peripheral edge of the washer body 61a. Protrudes forward. As shown in FIGS. 4 and 5, these engagement pieces 61 b are arranged at equal intervals along the circumferential direction, and their tips (front ends) are positioned in the corresponding engagement recesses 60. Each is formed to do. When the rotation difference θ between the outer case 23 and the hub 28 becomes a predetermined rotation difference θth, each engagement piece 61b engages with an end portion in the circumferential direction of each engagement recess 60, and is used for hysteresis. The washer 61 rotates with the outer case 23. At this time, a rotating force (also referred to as “rotational force”) of the hysteresis washer 61 and the outer case 23 is provided between the washer main body 61a of the hysteresis washer 61 and the friction member 56 pressed against the washer main body 61a. A weak frictional force is generated to reduce the rotational difference θ between the outer case 23 and the hub 28.

In FIG. 5, the width of the engaging recess 60 in the circumferential direction and the size of the engaging piece 61 b disposed in the engaging recess 60 are exaggerated for the convenience of understanding the description. .
Next, the operation of the damper 14 of this embodiment will be described.

  When torque from the engine 12 is transmitted to the outer case 23, the outer case 23 rotates in a predetermined rotation direction R. Then, the damper device 25 also rotates, and the torque from the engine 12 is transmitted to the limiter mechanism 26 via the outer case 23 and the damper device 25. At this time, since a frictional force is generated between the limiter plates 50 and 51 adjacent to each other in the front-rear direction, each second limiter plate 51 rotates along the predetermined rotation direction R together with each first limiter plate 50. To do. Based on the rotation of each second limiter plate 51, the hub 28 and the input shaft 16 of the planetary gear mechanism 15 rotate. That is, torque from the engine 12 is transmitted to the planetary gear mechanism 15 side.

  On the other hand, when a torque larger than the frictional force generated between the limiter plates 50 and 51 adjacent to each other with the friction material 52 interposed therebetween is transmitted to each first limiter plate 50 of the limiter mechanism 26 via the damper device 25. The limiter plates 50 and 51 adjacent to each other across the friction material 52 are in a sliding state. That is, torque transmission to the input shaft 16 side of the planetary gear mechanism 15 is blocked by the limiter mechanism 26.

  When the torque fluctuation that cannot be absorbed by the damper spring 42 of the damper device 25 is transmitted to the damper 14 and the rotational difference θ between the outer case 23 and the hub 28 becomes the predetermined rotational difference θth, the hysteresis mechanism 27 is activated. Specifically, each engagement piece 61 b of the hysteresis washer 61 is engaged with an end portion in the circumferential direction of each engagement recess 60 corresponding individually in the hysteresis plate 59. At this time, a frictional force that weakens the rotational force of the outer case 23 is generated between the washer body 61 a of the hysteresis washer 61 and the friction member 56 by the biasing force from the hysteresis disc spring 57. Then, the hysteresis washer 61 that rotates based on the rotation of the outer case 23 slides with respect to the friction member 56. The sliding speed of the hysteresis washer 61 is reduced by the frictional force generated between the washer body 61 a and the friction member 56. That is, the torque fluctuation transmitted to the damper 14 is absorbed by the hysteresis mechanism 27.

  Further, when the rotation difference θ between the outer case 23 and the hub 28 is less than the predetermined rotation difference θth, the hysteresis mechanism 27 does not operate. At this time, since the rotation of the outer case 23 is not restricted by the hysteresis mechanism 27, the torque from the engine 12 is transmitted to the planetary gear mechanism 15 side through the damper 14 with high efficiency.

Therefore, in this embodiment, the following effects can be obtained.
(1) The relative movement of the covers 21 and 22 in the direction away from each other by the biasing force from the limiter disc spring 53 of the limiter mechanism 26 indicates that both plates 32 disposed on both sides of the limiter mechanism 26 in the front-rear direction. 33 is suppressed. That is, when the covers 21 and 22 are combined with the damper device 25 and the limiter mechanism 26 accommodated in the lubricating oil storage chamber 24, relative movement of the covers 21 and 22 in the direction away from each other in the front-rear direction is suppressed. Therefore, it is not necessary to press the front cover 21 against the rear cover 22 side. Therefore, the front cover 21 can be easily aligned in the front-rear direction with respect to the rear cover 22, and the covers 21 and 22 can be easily welded as much as it is possible to save the trouble of applying a pressing force to at least one of the covers 21 and 22. Can do. Further, as compared with the conventional case where the front cover 21 needs to be pressed against the rear cover 22 side, the occurrence of distortion of the front cover 21 and the rear cover 22 during assembly can be suppressed.

  (2) The distance in the front-rear direction of the limiter accommodating chamber 35 in which the limiter mechanism 26 is accommodated does not change even if the limiter disc spring 53 is applied to at least one of the plates 32 and 33 supported by the hub 28. Therefore, the urging force from the limiter disc spring 53 is not applied to the covers 21 and 22. Therefore, the position of the front cover 21 relative to the rear cover 22 can be maintained at a predetermined position without pressing the front cover 21 toward the rear cover 22 during assembly.

  (3) The plates 32 and 33 constituting the separation regulating means are supported by the hub 28 in a state in which movement in the front-rear direction is impossible. Therefore, even if the urging force from the limiter disc spring 53 is applied to each of the plates 32 and 33, the hub 28 does not move in the front-rear direction. Therefore, it is possible to restrict the covers 21 and 22 from being applied with forces in the directions away from each other based on the biasing force from the limiter disc spring 53.

  (4) The limiter mechanism 26 is disposed on the inner side in the radial direction than the damper device 25. Therefore, compared with the case where the limiter mechanism 26 is disposed outside the damper device 25 in the radial direction, it is possible to contribute to the size reduction of the damper 14 in the radial direction.

  (5) The hysteresis mechanism 27 is disposed on the inner side in the radial direction than the damper device 25 and the limiter mechanism 26. Therefore, compared with the case where the hysteresis mechanism 27 is disposed outside the damper device 25 and the limiter mechanism 26 in the radial direction, it is possible to contribute to the size reduction of the damper 14 in the radial direction.

  (6) When the rotational difference θ between the outer case 23 and the hub 28 becomes the predetermined rotational difference θth, a frictional force that suppresses the rotation of the outer case 23 between the friction generating portion 55 and the washer body 61a. Is generated. Therefore, even if torque fluctuations such that the rotation difference θ between the outer case 23 and the hub 28 becomes the predetermined rotation difference θth are transmitted to the outer case 23, the torque fluctuations can be suitably absorbed by the hysteresis mechanism 27.

  (7) The friction generating portion 55 of the hysteresis mechanism 27 is disposed in the hysteresis accommodating chamber 34 between the hub flange portion 30 of the hub 28 and the first plate 32. Therefore, the biasing force from the hysteresis disc spring 57 of the friction generating portion 55 is suppressed from acting on the outer case 23. That is, the biasing force from the hysteresis disc spring 57 does not act on at least one of the covers 21 and 22 in a direction away from each other. That is, when the covers 21 and 22 are combined with the damper device 25, the limiter mechanism 26, and the hysteresis mechanism 27 accommodated in the lubricating oil storage chamber 24, the relative positions of the covers 21 and 22 in the direction away from each other in the front-rear direction. Since the movement is suppressed, there is no need to press the front cover 21 against the rear cover 22 side. Therefore, the front cover 21 can be easily aligned in the front-rear direction with respect to the rear cover 22, and the covers 21 and 22 can be easily welded as much as it is possible to save the trouble of applying a pressing force to at least one of the covers 21 and 22. Can do. Further, as compared with the conventional case where the front cover 21 needs to be pressed against the rear cover 22 side, the occurrence of distortion of the front cover 21 and the rear cover 22 during assembly can be suppressed.

  (8) Generally, the damper device 25 includes a drive member provided separately from the covers 21 and 22 constituting the outer case 23, and a first torque transmission portion is formed in the drive member. In this regard, the damper device 25 of the present embodiment is configured such that the drive side member is omitted, and the first torque transmission portions 37A and 37B are directly provided on the outer case 23, respectively. Therefore, the damper 14 can be reduced in size in the front-rear direction by reducing the number of members arranged along the front-rear direction compared to a damper provided with a conventional damper device.

In addition, you may change this embodiment into another embodiment as follows.
In the embodiment, the damper device 25 is an annular drive that is supported by a member (in the above embodiment, the outer case 23) disposed upstream of the damper device 25 in an integrally rotatable state. A member may be provided. In this case, the first torque transmission portion is provided not on the front cover 21 or the rear cover 22 but on the drive member. Even if comprised in this way, although the length in the front-back direction of the whole damper 14 becomes long compared with the case of the said embodiment, the urging | biasing force from each disc spring 53,57 is provided to each cover 21,22. Since this can be avoided, the damper 14 can be assembled easily.

In the embodiment, the first torque transmission portion 37 </ b> A may be configured to extend inward in the radial direction from the tubular portion 21 b of the front cover 21.
In the embodiment, each first torque transmission portion 37 </ b> A may be integrally formed with the front cover 21. Similarly, each first torque transmission portion 37 </ b> B may be integrally formed with the rear cover 22.

In the embodiment, either one of the first torque transmission unit 37A and the first torque transmission unit 37B may be omitted.
In the embodiment, the hysteresis mechanism 27 may have a configuration in which a portion corresponding to the washer body of the hysteresis washer 61, a portion corresponding to the friction member 56, and a biasing means for hysteresis are arranged along the radial direction. Even if comprised in this way, it can suppress that the urging | biasing force from the biasing means for hysteresis acts on each cover 21 and 22. FIG.

  In the embodiment, the damper 14 may have a configuration in which the hysteresis mechanism 27 is omitted. Further, the damper 14 may have a configuration in which the hysteresis mechanism 27 is disposed on the radially outer side than the limiter mechanism 26, or may have a configuration in which the hysteresis mechanism 27 is disposed on the radially outer side than the damper device 25.

  In the embodiment, the limiter mechanism may be disposed outside the damper device 25 in the radial direction. For example, as shown in FIG. 6, when the snap ring 75 is provided on the rear end side of the cylindrical portion 21b of the front cover 21, the limiter is interposed between the bottom portion 21a of the front cover 21 and the snap ring 75 in the front-rear direction. A mechanism 26A may be provided. The limiter mechanism 26A includes a limiter disc spring 53 supported by the snap ring 75, a first limiter plate 50 supported by the cylindrical portion 21b of the front cover 21 so as to be movable in the front-rear direction, and the limiter mechanism 26A. And a second limiter plate 51 supported by a damper device 25 arranged inside in the radial direction. Friction materials 70 and 71 are respectively provided on both sides of the second limiter plate 51 in the front-rear direction. The first friction material 70 is in sliding contact with the first limiter plate 50, and the second friction material 71 is The bottom cover 21a of the front cover 21 is in sliding contact. The first limiter plate 50 is restricted from being removed from the front cover 21 by a snap ring 75. Further, the limiter disc spring 53 is supported by a snap ring 75, and a biasing force from the limiter disc spring 53 to the rear side is applied to the snap ring 75. A gap 76 is formed between the snap ring 75 and the rear cover 22.

  Even with this configuration, the bottom 21 a of the front cover 21 is applied with a biasing force from the limiter disc spring 53 to the front side, and the snap ring 75 is applied to the rear side of the limiter disc spring 53. Power is granted. That is, the front cover 21 is not applied with a force for separating the front cover 21 from the rear cover 22 based on the biasing force from the limiter disc spring 53. Of course, the rear cover 22 is not applied with a force that causes the rear cover 22 to be separated from the front cover 21 based on the biasing force from the limiter disc spring 53. Therefore, when the front cover 21 is assembled to the rear cover 22, it is not necessary to apply a pressing force that causes the front cover 21 to approach the rear cover 22. Therefore, the damper 14 can be easily assembled. In such a configuration, the bottom portion 21a of the front cover 21 and the snap ring 75 constitute a separation restricting means, and the bottom portion 21a functions as a first restricting portion, and the snap ring 75 functions as a second restricting portion. Will do.

  In the embodiment, the flange portions 32c and 33c (that is, the plate members 32 and 33) may be configured to be slightly deformed by the biasing force from the limiter disc spring 53, respectively. In this case, the deformed flange portions 32c and 33c abut on the covers 21 and 22, respectively. Even if comprised in this way, the urging | biasing force from the limiter disc spring 53 provided to each cover 21 and 22 becomes very weak compared with the conventional case. Therefore, almost no pressing force is applied to each of the covers 21 and 22 in a direction away from each other.

  In each embodiment, the outer case 23 may be one in which the covers 21 and 22 are fixed by a fixing method other than welding. For example, the outer case 23 may be one in which the covers 21 and 22 are fixed with rivets. In this case, it is desirable to provide a seal ring (for example, an O-ring) for restricting the lubricating oil in the outer case 23 from flowing out to the contact portion of each cover 21, 22. Even if comprised in this way, the effect equivalent to the said embodiment can be acquired.

Next, the technical idea that can be grasped from the above embodiment and another embodiment will be added below.
(A) The housing includes a first fixing part of the first cover, and a second fixing part located in a position facing the first fixing part and the rotation axis in the radial direction of the second cover. The damper according to any one of claims 1 to 10, wherein the damper is welded.

  According to the above configuration, the outer portion in the radial direction of the second cover is added to the outer portion in the radial direction of the first cover without applying a pressing force in the direction in which the covers approach each other to at least one of the covers. Can be welded. Therefore, it is possible to suppress the occurrence of distortion of the outer case and to easily assemble it.

  DESCRIPTION OF SYMBOLS 12 ... Engine as a drive source, 14 ... Damper, 16 ... Input shaft as an output member, 21 ... Front cover as a 1st cover, 21a ... Bottom part (1st control part) which comprises a separation control means, 22 ... 1st Rear cover as 2 cover, 23 ... Outer case as housing, 24 ... Lubricating oil storage chamber as liquid storage chamber, 25 ... Damper device, 26, 26A ... Limiter mechanism, 27 ... Hysteresis mechanism, 28 ... Downstream member, Connection Hub as member, 30... Hub flange portion as flange portion, 32... First plate constituting separation restriction means, 32 c. First flange portion (supported member) as first restriction portion, 33. A second plate 33c, a second flange as a first restricting portion, 34, a hysteresis accommodating chamber as an installation space, 37A, 37B, a first torque transmission. , 41... 2nd torque transmission part, 42... Damper spring as elastic member, 50... First limiter plate as input side part, 51... Second limiter plate as output side part, 53. Disc spring for limiter, 55 ... friction generating portion, 56 ... friction member as contact member, 57 ... hysteresis spring as hysteresis biasing means, 58 ... rotating portion, 61a ... washer body as contacted portion 75 ... Snap ring (second restricting portion) constituting the separation regulating means, R ... rotation direction, S ... rotation axis, .theta .... rotation difference, .theta.th ... predetermined rotation difference.

Claims (10)

A damper disposed in a torque transmission path for transmitting torque from a power source to an output member that rotates about a predetermined rotation axis;
A housing having a first cover and a second cover arranged along the rotation axis, wherein a liquid storage chamber for storing a liquid is formed by combining the covers, and the housing rotates around the rotation axis When,
A damper device disposed in the liquid storage chamber and capable of absorbing torque fluctuations transmitted through the housing;
An input side portion disposed in the liquid storage chamber and serving as an input side in the torque transmission path, an output side portion disposed so as to face the input side section and serving as an output side in the torque transmission path, and the input side A limiter mechanism having limiter urging means for applying an urging force in a direction approaching each other to at least one of the portion and the output side portion;
A separation regulating means that is disposed in the liquid storage chamber and regulates relative movement of the first cover and the second cover in a direction away from each other by a biasing force from the limiter biasing means. Damper characterized by. The separation restricting means includes a first restricting portion disposed on one side of the limiter mechanism in a direction along the rotation axis, and a second restricting portion disposed on the other side of the limiter mechanism in a direction along the rotation axis. And having
The damper according to claim 1, wherein each of the restricting portions is provided so as to maintain a distance in a direction along the rotation axis. The separation restricting means is capable of rotating integrally with a downstream member located downstream of the limiter mechanism in the torque transmission path, and suppressing displacement of each restricting portion in a direction along the rotation axis. The damper according to claim 2, wherein the damper is supported in a pressed state. The damper according to any one of claims 1 to 3, wherein the limiter mechanism is disposed inside the damper device in a radial direction centered on the rotation axis. A coupling member coupled to the output member in a state of being integrally rotatable within the housing;
The damper according to claim 4, wherein the connecting member supports the separation restricting unit so as to be integrally rotatable. A hysteresis mechanism that is disposed in the liquid storage chamber and that operates when a rotation difference between the housing and the output member in a rotation direction around the rotation axis becomes a predetermined rotation difference set in advance;
6. The hysteresis mechanism according to claim 1, wherein the hysteresis mechanism is disposed inside the damper device and the limiter mechanism in a radial direction about the rotation axis. Damper. A cylindrical connecting member connected to the output member so as to be integrally rotatable in the housing;
An annular supported member disposed on the outer peripheral side of the connecting member and supported by the connecting member so as to be integrally rotatable,
The connecting member has a flange portion disposed at a position different from the supported member in a direction along the rotation axis, and an installation space between the flange portion and the supported member in the direction along the rotation axis. Are arranged to form,
The hysteresis mechanism rotates together with the housing when torque is transmitted from the housing when the rotational difference between the friction generating portion arranged in the installation space and the housing and the output member becomes the predetermined rotational difference. And a rotating part that
The friction generating part is configured to generate a frictional force between the rotating part and the rotating part so as to suppress the rotation of the rotating part when the rotating part rotates together with the housing. The damper according to claim 6. The rotating part has a contacted part arranged in the installation space,
The friction generating portion is displaceable in a direction along the rotation axis and is in contact with the contacted portion of the rotating portion, and the contact member is in pressure contact with the contacted portion. The damper according to claim 7, further comprising a hysteresis biasing unit that applies a biasing force to the contact member. The damper device is
A first torque transmission portion provided in a state capable of transmitting torque to the housing;
A second torque transmission portion arranged at the same position as the first torque transmission portion in the radial direction and configured to transmit torque to the output member side;
An elastic member arranged in a state capable of transmitting torque between the first torque transmitting portion and the second torque transmitting portion in a circumferential direction around the rotation axis, and capable of extending and contracting along the circumferential direction; The damper according to claim 4 or 5, wherein the damper is provided. The first torque transmission portion is provided in a state that can rotate integrally with the housing, and the input side portion of the limiter mechanism is connected to the second torque transmission portion in a state that allows torque transmission. The damper according to claim 9, wherein the damper is characterized.

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