Damper device

Abstract

To inhibit reduction of strength.SOLUTION: A first plate includes a plate body, extending parts, and cutout parts. The extending part extends from an outer peripheral end of the plate body in an axial direction. The cutout part is disposed at a position located adjacent to the extending part in a circumferential direction. The second plate is configured to rotate integrally with the first plate. The second plate has engagement holes. The engagement hole is disposed so as to overlap with the cutout part in an axial view. The third plate is disposed so as to be rotatable relative to the first plate and the second plate. The third plate is disposed between the first plate and the second plate in the axial direction. The third plate has engagement parts. The engagement part is disposed so as to overlap with the cutout part and the engagement hole in the axial view. The elastic member elastically connects the first plate and the second plate with the third plate.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a damper device. [Background technology]

[0002] The damper device has a first plate, a second plate, a hub flange, and a torsion spring (see, for example, Patent Document 1). The torsion spring elastically connects the first and second plates to the hub flange. Each plate has a plurality of windows for accommodating the torsion spring. When assembling the damper device, positioning pins are inserted into through holes for positioning pins formed in each of the three plates to position the three plates. The through holes for positioning pins are formed in areas sandwiched between adjacent window portions in the circumferential direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-196013 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since the area between the adjacent window portions of each plate is prone to stress concentration during torque transmission, forming through holes for positioning pins in this area may reduce the strength of the plate. Therefore, an object of the present invention is to prevent this reduction in strength. [Means for solving the problem]

[0005] The damper device according to the first aspect includes a first plate, a second plate, a third plate, and an elastic member. The first plate has a plate body, an extension portion, and a notch portion. The extension portion extends in the axial direction from an outer peripheral end portion of the plate body. The notch portion is arranged at a position adjacent to the extension portion in the circumferential direction. The notch portion is configured to engage with a positioning pin. The second plate is configured to rotate integrally with the first plate. The second plate has an engagement hole. The engagement hole is arranged to overlap with the notch portion in an axial view. The engagement hole is configured to receive the positioning pin. The third plate is arranged to be rotatable relative to the first plate and the second plate. The third plate is arranged between the first plate and the second plate in the axial direction. The third plate has an engagement portion. The engagement portion is arranged to overlap with the notch portion and the engagement hole in an axial view. The engagement portion is configured to engage with the positioning pin. The elastic member elastically connects the first plate, the second plate and the third plate.

[0006] According to this configuration, the notch portion configured to engage with the positioning pin is formed on the outer peripheral end of the plate body. The engagement hole and the engagement portion are positioned so as to overlap with the notch portion. In this way, the notch portion, the engagement hole and the engagement portion for the positioning pin are not formed in the area sandwiched between the adjacent window portions, so that a decrease in strength can be suppressed.

[0007] The damper device according to the second aspect is the damper device according to the first aspect, and is configured as follows: The engagement portion is configured as a notch in the outer circumferential end portion of the third plate.

[0008] The damper device according to a third aspect is the damper device according to the first or second aspect, and is configured as follows: the third plate has a protruding portion including a pair of corners, and the engagement portion is formed in at least one of the pair of corners.

[0009] A damper device according to a fourth aspect is the damper device according to any one of the first to third aspects, and is configured as follows: the third plate has a protruding portion including a pair of corners, and the engagement portion is formed at only one of the pair of corners.

[0010] A damper device according to a fifth aspect is the damper device according to any one of the first to fourth aspects, and is configured as follows: the first plate has a first window portion that houses the elastic member. The cutout portion is disposed radially outward from the first window portion.

[0011] A damper device according to a sixth aspect is the damper device according to any one of the first to fifth aspects, further comprising a fourth plate and a fastening member. The fourth plate is attached to the first plate. The fastening member fastens the fourth plate to the first plate. The first plate has a plurality of first window portions and fastening holes. The plurality of first window portions are arranged at intervals from one another in the circumferential direction. The fastening holes are arranged between adjacent first window portions. The fastening member passes through the fastening hole. The cutout portion is arranged so as not to overlap with the fastening hole when viewed in the radial direction.

[0012] A damper device according to a seventh aspect is the damper device according to the sixth aspect, and is configured as follows: The cutout portion is disposed radially outward with respect to the fastening hole.

[0013] The damper device according to an eighth aspect is the damper device according to the sixth or seventh aspect, and is configured as follows: The second plate has an opening. The opening is arranged so as to overlap with the fastening hole when viewed in the axial direction. The opening has a larger diameter than the fastening hole. The engagement hole is arranged so as not to overlap with the opening when viewed in the radial direction. Effect of the Invention

[0014] According to the present invention, it is possible to suppress a decrease in strength. [Brief description of the drawings]

[0015] [Figure 1] FIG. [Diagram 2] Cross-sectional view of line II-II in Figure 1. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] Front view of the third plate. [Figure 7] FIG. 4 is a front view of the first plate and the third plate superimposed on each other. [Figure 8] FIG. 11 is a front view of a third plate according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The damper device 100 according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction is the direction in which the rotation axis O of the damper device 100 extends. The circumferential direction is the circumferential direction of a circle centered on the rotation axis O, and the radial direction is the radial direction of a circle centered on the rotation axis O. The first axial side refers to the left side in FIG. 2, and the second axial side refers to the right side in FIG. 2.

[0017] FIG. 1 is a front view of the damper device, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the damper device 100 has a torque limiter unit 3 and a damper unit 4. The torque limiter unit 3 and the damper unit 4 basically rotate integrally with each other. The damper device 100 is provided between an internal combustion engine (not shown) and an input shaft (not shown) of an output side member such as a transmission. The damper device 100 is attached to a flywheel (not shown). For example, in FIG. 2, the internal combustion engine is disposed on the left side of the damper device 100, and the output side member is disposed on the right side of the damper device 100. The damper device 100 is configured to limit the torque transmitted between the internal combustion engine and the output side member, and to attenuate torque fluctuations.

[0018] [Torque limiter unit] The torque limiter unit 3 is disposed rotatably about a rotation axis O. The torque limiter unit 3 is disposed on a second axial side with respect to the flywheel. The torque limiter unit 3 is annular. The torque limiter unit 3 is attached to the flywheel.

[0019] The torque limiter unit 3 is configured to limit the torque transmitted between the flywheel and the damper unit 4. In other words, the torque limiter unit 3 is configured to restrict the transmission of torque in the damper device 100 that is equal to or greater than a predetermined value.

[0020] The torque limiter unit 3 includes a side plate 31, a cover plate 32, a pressure plate 33, a fourth plate , a first friction material 35a, a second friction material 35b, and a disc spring .

[0021] The side plate 31 and the cover plate 32 are attached to the flywheel. The side plate 31 and the cover plate 32 rotate integrally with the flywheel. The side plate 31 and the cover plate 32 are annular. The cover plate 32 is disposed on a second axial side relative to the side plate 31. The plate thickness of the cover plate 32 is thinner than the plate thickness of the side plate 31.

[0022] The pressure plate 33 is annular. The pressure plate 33 is disposed between the side plate 31 and the cover plate 32 in the axial direction. In detail, the pressure plate 33 is disposed between the second friction material 35b and the disc spring 36 in the axial direction. The pressure plate 33 is configured to rotate integrally with the side plate 31. The pressure plate 33 is movable in the axial direction relative to the side plate 31.

[0023] The disc spring 36 is disposed between the cover plate 32 and the pressure plate 33 in the axial direction. The disc spring 36 urges the pressure plate 33 toward the first side in the axial direction. That is, the disc spring 36 urges the pressure plate 33 toward the fourth plate 34. As a result, the fourth plate 34 and the first and second friction materials 35a, 35b are sandwiched between the pressure plate 33 and the side plate 31.

[0024] The fourth plate 34 is configured to be frictionally engaged with the side plate 31. More specifically, the fourth plate 34 is configured to be frictionally engaged with the side plate 31 via the first friction material 35a. The fourth plate 34 is also configured to be frictionally engaged with the pressure plate 33. More specifically, the fourth plate 34 is configured to be frictionally engaged with the pressure plate 33 via the second friction material 35b.

[0025] When a torque equal to or greater than a predetermined value is input to the damper device 100, the fourth plate 34 slides against the side plate 31 and the pressure plate 33 via the friction materials 35a, 35b, and rotates relatively to the side plate 31 and the pressure plate 33. On the other hand, when a torque less than the predetermined value is input, the fourth plate 34 rotates integrally with the side plate 31 and the pressure plate 33.

[0026] The fourth plate 34 is annular. The fourth plate 34 is disposed between the side plate 31 and the cover plate 32 in the axial direction. The fourth plate 34 is attached to a first plate 41, which will be described later. The fourth plate 34 rotates integrally with the first plate 41.

[0027] The first and second friction materials 35a, 35b are annular. The first friction material 35a is disposed between the fourth plate 34 and the side plate 31 in the axial direction. The second friction material 35b is disposed between the fourth plate 34 and the pressure plate 33 in the axial direction.

[0028] The first and second friction materials 35a, 35b are fixed to the fourth plate 34. The first friction material 35a is frictionally engaged with the side plate 31. The second friction material 35b is frictionally engaged with the pressure plate 33. When a torque equal to or greater than a predetermined value is input to the damper device 100, the first friction material 35a slides against the side plate 31, and the second friction material 35b slides against the pressure plate 33. As a result, the side plate 31 and the fourth plate 34 rotate relative to each other. The first friction material 35a may be fixed to the side plate 31 and frictionally engaged with the fourth plate 34. The second friction material 35b may be fixed to the pressure plate 33 and frictionally engaged with the fourth plate 34.

[0029] [Damper unit] The damper unit 4 is attached to the torque limiter unit 3. The damper unit 4 is configured to damp rotation fluctuations. Fig. 3 is a front view of the damper unit 4. As shown in Figs. 2 and 3, the damper unit 4 has a first plate 41, a second plate 42, a third plate 43, and a plurality of elastic members 44.

[0030] <First and second plates> The first plate 41 and the second plate 42 rotate integrally with each other. The first plate 41 and the second plate 42 are immovable relative to each other in the axial direction. The first plate 41 and the second plate 42 are configured to rotate integrally with the fourth plate 34.

[0031] The fourth plate 34 is attached to the first plate 41 by a first fastening member 37. The first fastening member 37 fastens the fourth plate 34 to the first plate 41. An example of the first fastening member 37 is a rivet. Note that the fourth plate 34 is a separate member from the first plate 41, but the fourth plate 34 may be configured integrally with the first plate 41 as a single member. The first plate 41 and the second plate 42 are both annular members having a center hole.

[0032] The first plate 41 and the second plate 42 are disposed at an interval from each other in the axial direction. The second plate 42 is disposed on a second side in the axial direction relative to the first plate 41.

[0033] Fig. 4 is a front view of the first plate 41. As shown in Fig. 2 and Fig. 4, the first plate 41 has a first plate body 411, a plurality of first window portions 412, a plurality of extending portions 413, a plurality of first mounting portions 414, a plurality of notched portions 415, and a plurality of fastening holes 416. Note that in this embodiment, the first plate 41 has four first window portions 412, four extending portions 413, four first mounting portions 414, eight notched portions 415, and four fastening holes 416, but the numbers of these are not limited to this.

[0034] The first plate body 411 is disk-shaped and has an opening in the center. Each first window portion 412 is formed in the first plate body 411. The first windows 412 are arranged at intervals from one another in the circumferential direction. Each first window portion 412 is configured to accommodate an elastic member 44. A fastening hole 416 is formed between adjacent first windows 412 in the circumferential direction. When the first fastening member 37 fastens the fourth plate 34 to the first plate 41, the first fastening member 37 passes through the fastening hole 416.

[0035] The extension portions 413 are disposed at intervals from one another in the circumferential direction. Each extension portion 413 extends in the axial direction from the outer peripheral end portion of the first plate body 411. In detail, each extension portion 413 extends from the outer peripheral end portion of the first plate body 411 toward the second axial side, i.e., toward the second plate 42. Each first mounting portion 414 extends from a tip end portion of each extension portion 413 radially outward.

[0036] Each of the cutouts 415 is disposed at an outer peripheral end of the first plate body 411. Each of the cutouts 415 is formed at a position adjacent to the extending portion 413 in the circumferential direction. In this embodiment, the cutouts 415 are formed on both sides of each of the extending portions 413. The cutouts 415 are formed by cutting out the first plate body 411 at a position adjacent to the extending portion 413. The cutouts 415 are configured to be recessed radially inward. That is, the cutouts 415 open radially outward.

[0037] The notch portion 415 is arranged so as not to overlap with the fastening hole 416 in a radial view. The notch portion 415 is arranged radially outward from the fastening hole 416. The notch portion 415 is arranged radially outward from the first window portion 412. The notch portion 415 is arranged radially outward from a region sandwiched between a pair of first window portions 412 adjacent in the circumferential direction. In detail, the notch portion 415 is arranged radially outward from a line (a two-dot chain line in FIG. 4) connecting the radially outer corners of a pair of first window portions 412 adjacent in the circumferential direction. In this way, the notch portion 415 is not formed in a region sandwiched between a pair of first window portions 412 adjacent in the circumferential direction.

[0038] The notch portion 415 is formed in an arc shape when viewed in the axial direction. The notch portion 415 is configured to engage with a positioning pin used when assembling the damper device 100. The positioning pin is a pin for positioning the first plate 41, the second plate 42, and the third plate 43 relative to each other. When assembling the damper device 100, the positioning pin passes through the notch portion 415 in the axial direction. The positioning pin abuts against a surface that defines the notch portion 415. This positions the first plate 41.

[0039] Fig. 5 is a front view of the second plate 42. As shown in Fig. 2 and Fig. 5, the second plate 42 has a second plate main body 421, a plurality of second window portions 422, a plurality of second mounting portions 423, a plurality of engagement holes 424, and a plurality of openings 425. In this embodiment, the second plate 42 has four second window portions 422, four second mounting portions 423, and eight engagement holes 424, but the numbers are not limited to this.

[0040] The second plate body 421 is disk-shaped and has an opening in the center. The second windows 422 are spaced apart from one another in the circumferential direction. The second windows 422 are arranged at positions overlapping with the first windows 412 when viewed in the axial direction. The second windows 422 are configured to accommodate the elastic members 44.

[0041] The opening 425 is formed between the second window portions 422 adjacent to each other in the circumferential direction. The opening 425 is disposed so as to overlap with the fastening hole 416 when viewed in the axial direction. The opening 425 has a larger diameter than the fastening hole 416. When the fourth plate 34 is crimped to the first plate 41 by the first fastening member 37, a tool for crimping the first fastening member 37 is used via the opening 425.

[0042] The second mounting portions 423 are disposed at intervals from one another in the circumferential direction. The second mounting portions 423 protrude radially outward from the second plate body 421. The second mounting portions 423 are fixed to the first mounting portions 414 by the second fastening members 46. That is, the first plate 41 and the second plate 42 are fastened to each other by the second fastening members 46, and thereby rotate integrally with each other (see FIG. 3).

[0043] Each engagement hole 424 is configured to receive a positioning pin. As shown in Fig. 3, each engagement hole 424 is disposed so as to overlap with each notch 415 in the axial view. In detail, a portion of the contour of each engagement hole 424 and a portion of the contour of each notch 415 overlap in the axial view. The positioning pin comes into contact with this overlapping portion, thereby positioning the first plate 41 and the second plate 42 relative to each other.

[0044] As shown in FIG. 5, the engagement hole 424 is disposed at the outer peripheral end of the second plate body 421. The engagement hole 424 is disposed so as not to overlap with the opening 425 in a radial view. The engagement hole 424 is disposed radially outward from the opening 425. The engagement hole 424 is disposed radially outward from the second window portion 422. The engagement hole 424 is disposed radially outward from a region sandwiched between a pair of second window portions 422 adjacent in the circumferential direction. In detail, the engagement hole 424 is disposed radially outward from a line (a two-dot chain line in FIG. 5) connecting the radially outer corners of a pair of second window portions 422 adjacent in the circumferential direction. In this way, the engagement hole 424 is not formed in a region sandwiched between a pair of second window portions 422 adjacent in the circumferential direction.

[0045] <Third Plate> 2, the third plate 43 is configured to transmit torque from the first and second plates 41, 42 to the output side member. The third plate 43 is disposed between the first plate 41 and the second plate 42 in the axial direction. The third plate 43 is disposed to be rotatable relative to the first plate 41 and the second plate 42.

[0046] The third plate 43 has a hub 43a and a flange plate 43b. The hub 43a and the flange plate 43b are configured as separate members, but may be integrally formed as a single member.

[0047] The hub 43a is cylindrical and is disposed within the central holes of the first plate 41 and the second plate 42. A spline hole extending in the axial direction is formed on the inner periphery of the hub 43a. The input shaft of the output side member can be spline-engaged with this spline hole.

[0048] The flange plate 43b extends in the radial direction from the outer circumferential surface of the hub 43a. The flange plate 43b is formed in an annular shape. The flange plate 43b is arranged to be rotatable relative to the first plate 41 and the second plate 42. The flange plate 43b is arranged between the first plate 41 and the second plate 42 in the axial direction.

[0049] Fig. 6 is a front view of the third plate 43 with the hub 43a removed. As shown in Fig. 6, the third plate 43 has a third plate body 431, a plurality of accommodating holes 432, a plurality of protruding portions 433, a plurality of engaging portions 434, and a plurality of stopper portions 435. In this embodiment, the third plate 43 has four accommodating holes 432, four protruding portions 433, eight engaging portions 434, and four stopper portions 435, but the numbers of these are not limited to this.

[0050] The third plate body 431 is disk-shaped. The accommodating holes 432 are arranged at intervals in the circumferential direction. Each accommodating hole 432 is configured to accommodate an elastic member 44. Each accommodating hole 432 is arranged at a position overlapping with each first window portion 412 and each second window portion 422 when viewed in the axial direction.

[0051] Each of the protruding portions 433 protrudes radially outward from the third plate body 431. Each of the protruding portions 433 is configured to have a pair of corners. Specifically, each of the protruding portions 433 has a substantially rectangular shape when viewed in the axial direction.

[0052] Each of the engagement portions 434 is formed on both of a pair of corners of each of the protrusions 433. Each of the engagement portions 434 is configured as a notch on the outer circumferential end portion of the third plate 43. Each of the engagement portions 434 is configured to engage with a positioning pin.

[0053] 7, each engagement portion 434 is disposed so as to overlap with a notch portion 415 when viewed in the axial direction. In detail, the contour of each engagement portion 434 extends so as to follow the contour of each notch portion 415. Each engagement portion 434 is slightly larger than each notch portion 415. The first plate 41 and the third plate 43 are positioned relative to each other by abutting a positioning pin against a surface that defines each engagement portion 434.

[0054] Each engagement portion 434 is disposed so as to overlap with an engagement hole 424 when viewed in the axial direction. The contour of each engagement portion 434 extends so as to follow the contour of each engagement hole 424. Each engagement portion 434 is slightly larger than each engagement hole 424. The second plate 42 and the third plate 43 are positioned relative to each other by abutting a positioning pin against a surface that defines each engagement portion 434.

[0055] 6, the engagement portion 434 is disposed radially outward from the accommodating hole 432. The engagement portion 434 is disposed radially outward from a region sandwiched between a pair of accommodating holes 432 adjacent in the circumferential direction. In detail, the engagement portion 434 is disposed radially outward from a line (a two-dot chain line in FIG. 6) connecting radially outer corners of a pair of accommodating holes 432 adjacent in the circumferential direction. In this way, the engagement portion 434 is not formed in a region sandwiched between a pair of accommodating holes 432 adjacent in the circumferential direction.

[0056] Each stopper portion 435 protrudes radially outward from the outer circumferential surface of each protruding portion 433. Each stopper portion 435 faces each extending portion 413 in the circumferential direction. Each stopper portion 435 and each extending portion 413 regulates the relative rotation angle between the first and second plates 41, 42 and the third plate 43. In other words, when the first plate 41 and the second plate 42 rotate by a predetermined angle relative to the third plate 43, each stopper portion 435 abuts against each extending portion 413.

[0057] <Elastic material> 2 and 3, the elastic member 44 is configured to elastically connect in the rotational direction the first and second plates 41, 42 and the third plate 43. The elastic member 44 is, for example, a coil spring.

[0058] The elastic member 44 is housed in the housing hole 432 of the third plate 43. In addition, the elastic member 44 is housed in the first window portion 412 of the first plate 41, and is also housed in the second window portion 422 of the second plate 42.

[0059] [Variations] The present invention is not limited to the above-described embodiment, and various modifications and alterations are possible without departing from the scope of the present invention. In addition, the following modifications can be simultaneously applied.

[0060] (a) In the above embodiment, the engagement portion 434 is formed at both corners of the protruding portion 433, but the configuration of the third plate 43 is not limited to this. For example, as shown in Fig. 8, the engagement portion 434 may be formed at only one of a pair of corners of the protruding portion 433. With this configuration, it is possible to prevent the third plate 43 from being assembled upside down.

[0061] (b) In the above embodiment, the engagement portion 434 is formed as a notch, but is not limited to this. For example, the engagement portion 434 may be formed as a through hole. [Explanation of symbols]

[0062] 41: First plate 412: First window 413 :Extension part 415: Notch 416: Fastening hole 42: Second plate 424: Engagement hole 425: Opening 43: 3rd plate 433:Protrusion 434: Engagement part 34: 4th plate 44: Elastic member 100: Damper device

Claims

1. a first plate having a plate body, an extension portion extending in an axial direction from an outer peripheral end portion of the plate body, and a notch portion disposed at a position adjacent to the extension portion in the circumferential direction and configured to engage with a positioning pin; a second plate having an engagement hole into which the positioning pin is inserted, the second plate being arranged to overlap the notch portion in an axial view, and configured to rotate integrally with the first plate; a third plate having an engaging portion that is arranged to overlap with the notch portion and the engaging hole in an axial view and is configured to engage with the positioning pin, the third plate being arranged between the first plate and the second plate in the axial direction and rotatable relative to the first plate and the second plate; an elastic member that elastically connects the first plate, the second plate, and the third plate; A damper device comprising:

2. The engagement portion is configured as a notch on an outer peripheral end portion of the third plate. The damper device according to claim 1 .

3. the third plate has a protruding portion including a pair of corner portions, The engaging portion is formed on at least one of the pair of corner portions. The damper device according to claim 1 .

4. the third plate has a protruding portion including a pair of corner portions, The engaging portion is formed at only one of the pair of corner portions. The damper device according to claim 1 .

5. the first plate has a first window portion that accommodates the elastic member, The cutout portion is disposed radially outward from the first window portion. The damper device according to claim 1 .

6. a fourth plate attached to the first plate; a fastening member that fastens the fourth plate to the first plate; Further equipped with The first plate has a plurality of first window portions arranged at intervals from each other in a circumferential direction, and fastening holes arranged between adjacent first window portions and through which the fastening members pass, The cutout portion is arranged so as not to overlap with the fastening hole when viewed in the radial direction. The damper device according to claim 1 .

7. The notch portion is disposed radially outward relative to the fastening hole. The damper device according to claim 6.

8. The second plate has an opening that is arranged to overlap with the fastening hole when viewed in the axial direction and has a diameter larger than that of the fastening hole, The engagement hole is arranged so as not to overlap with the opening when viewed in the radial direction. The damper device according to claim 6.

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