Torque fluctuation absorption device

Abstract

Providing a torque fluctuation absorption device that can be easily adapted for multiple applications. [Solution] In a torque fluctuation absorption device comprising a damper section and a torque limiter section, the torque limiter section comprises a cover plate and a support plate, the cover plate has a predetermined depth on the first axial direction side and is configured to have a plurality of recesses discretely arranged in the circumferential direction, and the support plate has an extension that extends radially outward from the outer circumference of the annular main body and is arranged between the recesses in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a torque fluctuation absorber.

Background Art

[0002] Conventionally, a torque limiter that limits torque fluctuations between a first rotating shaft and a second rotating shaft is known. This is achieved by sandwiching a member extending from a damper portion interlocked with the second rotating shaft via a sliding member using a cover plate and a support plate interlocked with the first rotating shaft (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional technology, it has not been easy to divert a torque fluctuation absorber to a plurality of targets. For example, consider diverting a torque fluctuation absorber to multiple vehicle models. Since the required inertia ring weight and size can vary depending on the vehicle model, the diameter of the inertia ring can differ for each vehicle model. When using an inertia ring with a diameter corresponding to the vehicle model, if many parts of the torque fluctuation absorber need to be changed according to the change in the diameter of the inertia ring, it becomes difficult to use the torque fluctuation absorber for multiple vehicle models.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a torque fluctuation absorber that is easy to divert to a plurality of targets.

Means for Solving the Problems

[0006] To achieve the above objective, the torque fluctuation absorbing device comprises: an annular cover plate fastened to an inertial ring connected to a first rotating shaft; an annular support plate fastened to the cover plate; an inter-plate fastening member used for fastening the cover plate and the support plate; a damper portion connected to a second rotating shaft; and a torque limiter portion that sandwiches a member extending from the damper portion between the cover plate and the support plate via a sliding member and a biasing member, and allows slippage when the torque fluctuation between the first rotating shaft and the second rotating shaft reaches a predetermined value, wherein the cover plate has a predetermined depth on the first axial direction side and is a recess formed therein where an inertial ring fastening portion, which is a fastening portion for fastening to the inertial ring, is formed, and discretely in the circumferential direction The support plate has a plurality of recesses arranged in a row, and between the recesses in the circumferential direction, there are support plate fastening portions which are fastening portions for fastening to the support plate. The support plate extends radially outward from the outer circumference of the annular main body and has an extension portion which is positioned between the recesses in the circumferential direction, and has an extension portion which has a cover plate fastening portion formed thereon, which is a fastening portion for fastening to the cover plate. In the plurality of recesses, the positions of the end faces on the first direction in the axial direction are the same, and with the end faces on the first direction in the axial direction in contact with the inertial ring, the inertial ring is fastened to the cover plate by a fastening member at the inertial ring fastening portion, and the cover plate and the support plate are fastened together by the inter-plate fastening member at the support plate fastening portion and the cover plate fastening portion.

[0007] In other words, the inertial ring is fastened to the cover plate by contacting it at the end faces of the first axial direction of the multiple recesses, and the extension of the support plate is located between the multiple recesses when the inertial ring is fastened to the cover plate. Therefore, when the inertial ring is fastened to the cover plate, the extension of the support plate and the inertial ring are unlikely to interfere with each other in the axial direction. With this configuration, it is possible to change the shape of the cover plate and the inertial ring without changing the shape of the support plate. Thus, among the components of the torque fluctuation absorption device, the design of the inertial ring can be accommodated by changing only the shape of the cover plate, and a torque fluctuation absorption device that can be easily reused for multiple applications can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram shows the torque fluctuation absorption device as viewed from the transaxle side. [Figure 2] This diagram shows the torque fluctuation absorption device as viewed from the engine side. [Figure 3] Figure 3A is a perspective view of the torque fluctuation absorption device as seen from the transaxle side, and Figure 3B is a perspective view of the torque fluctuation absorption device as seen from the engine side. [Figure 4] Figure 4A is a cross-sectional view of the torque fluctuation absorption device when cut along line AA, and Figure 4B is a cross-sectional view of the torque fluctuation absorption device when cut along line AB. [Figure 5] This diagram shows the cover plate removed from the torque fluctuation absorption device, viewed from the transaxle side along the axial direction. [Figure 6] This diagram shows the cover plate removed from the torque fluctuation absorption device, viewed from the engine side along the axial direction. [Figure 7] Figure 7A is a perspective view of the cover plate as seen from the transaxle side, and Figure 7B is a perspective view of the support plate as seen from the transaxle side. [Figure 8]This diagram shows the support plate removed from the torque fluctuation absorption device, viewed from the transaxle side along the axial direction. [Figure 9] This diagram shows the support plate removed from the torque fluctuation absorption device, viewed from the engine side along the axial direction. [Figure 10] Figure 10A is an enlarged cross-sectional view of the torque fluctuation absorption device when cut along line AA, Figure 10B is a cross-sectional view showing the cover plate in a state where the fastening to the support plate has been released, and Figure 10C is a perspective view of the pressure plate from the transaxle side. [Figure 11] This is a cross-sectional view showing the cover plate in a state where it has been released from its fastening to the support plate. [Modes for carrying out the invention]

[0009] Here, embodiments of the present invention will be described in the following order. (1) Configuration of the torque fluctuation absorption device: (2) Cover plate configuration: (3) Support plate configuration: (4) Other embodiments:

[0010] (1) Configuration of the torque fluctuation absorption device: Figures 1, 2, 3A, 3B, 4A, and 4B show a torque fluctuation absorption device 1 according to one embodiment of the invention. The torque fluctuation absorption device 1 is a device on which torque acts when a first rotating shaft (not shown) and a second rotating shaft (not shown) rotate. Figures 1 and 2 show the torque fluctuation absorption device 1 viewed from a direction parallel to the rotating shaft Ax. In this embodiment, the first rotating shaft is a rotating shaft linked to the vehicle's engine, and the second rotating shaft is a rotating shaft linked to the vehicle's transaxle.

[0011] Figure 1 is a view of the torque fluctuation absorption device 1 from the second rotation axis side, i.e., the transaxle side, in a direction parallel to the rotation axis Ax. Figure 2 is a view of the torque fluctuation absorption device 1 from the first rotation axis side, i.e., the engine side, in a direction parallel to the rotation axis Ax. Figure 3A is a perspective view of the torque fluctuation absorption device 1 from the transaxle side. Figure 3B is a perspective view of the torque fluctuation absorption device 1 from the engine side. Figure 4A is a cross-sectional view of the torque fluctuation absorption device 1 when cut along line AA shown in Figure 1, and Figure 4B is a cross-sectional view of the torque fluctuation absorption device 1 when cut along line AB shown in Figure 1. Note that hatching is omitted for some members in the cross-sectional views. Also, Figure 4B shows a part of the cross-section.

[0012] In this specification, the direction parallel to the axis of rotation Ax is referred to as the axial direction, the direction perpendicular to the axis of rotation Ax is referred to as the radial direction, and the direction of rotation around the axis of rotation Ax is referred to as the circumferential direction. Furthermore, in the radial direction, the direction away from the axis of rotation Ax is referred to as the radially outward direction, and the direction approaching the axis of rotation Ax is referred to as the radially inward direction. In addition, in this embodiment, when it is necessary to distinguish the axial direction, the engine side is referred to as the first direction side, and the transaxle side as the second direction side.

[0013] The torque fluctuation absorption device 1 comprises a damper section 2 and a torque limiter section 3 (see Figure 4A), and is a device that absorbs and limits the torque transmitted between the first rotating shaft and the second rotating shaft. The damper section is a device that absorbs the torque transmitted between the first rotating shaft and the second rotating shaft, and can be realized by a known configuration.

[0014] In the configuration example shown in Figure 4A, the damper portion 2 includes a hub member 2a connected to a second rotating shaft, the hub member 2a having the second rotating shaft connected to its radially inward side. The hub member 2a has a flange portion 2b extending radially outward. The flange portion 2b has a window portion in its radially intermediate portion for accommodating a coil spring 2c and an elastic member 2d. The flange portion 2b is sandwiched between side plates 2e and 2f that rotate integrally with the hub member 2a. The side plates 2e and 2f are fastened to each other radially outward.

[0015] Between the side plates 2e and 2f, an intermediate plate 2g, which is a plate-shaped annular member, is fixed in a sandwiched state. In the radial direction, the diameter of the outer periphery of the intermediate plate 2g is larger than the diameters of the outer peripheries of the side plates 2e and 2f. Therefore, the intermediate plate 2g is a member that extends outward from the side plates 2e and 2f in the radial direction and corresponds to the member extending from the damper portion 2.

[0016] (2) Structure of the cover plate: The torque limiter portion 3 according to the present embodiment includes a cover plate 10 and a support plate 20. The cover plate 10 is an annular member that is fastened to an inertia ring connected to the first rotating shaft. FIGS. 5, 6, and 7A are views showing the cover plate 10. FIG. 5 is a view of the cover plate 10 taken out from the torque fluctuation absorption device 1 and viewed axially along the transaxle side. FIG. 6 is a view of the cover plate 10 taken out from the torque fluctuation absorption device 1 and viewed axially along the engine side. FIG. 7A is a perspective view of the cover plate 10 viewed from the transaxle side.

[0017] The cover plate 10 is a member formed by shaping a plate-shaped member into an annular shape, and in most parts of the cover plate 10, the plate thickness direction faces the axial direction. The cover plate 10 includes an annular inner peripheral portion 10a formed on the inner side in the radial direction and an annular outer peripheral portion 10b formed on the outer side in the radial direction from the inner peripheral portion 10a, and the plane to which the outer peripheral portion 10b belongs exists at a position shifted to the first direction side in the axial direction with respect to the plane to which the inner peripheral portion 10a belongs. That is, the outer peripheral portion 10b exists on the first direction side from the inner peripheral portion 10a.

[0018] A plurality of recesses 11 are formed in the outer peripheral portion 10b of the cover plate 10. In the present embodiment, the plurality of recesses 11 are formed so as to be discretely arranged in the outer peripheral portion 10b. Further, the recesses 11 are formed at nine locations in the outer peripheral portion 10b, but the number of the recesses 11 is not limited. Also, in the present embodiment, the recesses 11 form groups of three. That is, the circumferential distance L1 between the three recesses 11 belonging to the same group is the same, the circumferential distance L2 between the recesses 11 belonging to different groups is the same, and L1 < L2 (see FIG. 7A).

[0019] In the present embodiment, the recess 11 is formed such that the circumferential width increases toward the radially outer side. Further, the recess 11 is formed such that it tapers toward the first direction side in the axial direction and the end face on the first direction side in the axial direction is flat. The recess 11 has a predetermined depth D on the first direction side in the axial direction (see FIGS. 4A and 7A). In the present embodiment, the recess 11 is formed by deep drawing, and the position of the end face P1 on the first direction side in the axial direction is the same in the plurality of recesses 11. That is, the position of the end face P1 on the first direction side in the axial direction of the recess 11 exists on a plane perpendicular to the axial direction. Although an inertia ring is fastened to the recess 11 as described later, recesses (not shown) to which the inertia ring is not fastened may be formed in the cover plate 10. In this case, the position of the end face of the recess (not shown) may be the same as or different from the end face P1 on the first direction side in the axial direction of the recess 11.

[0020] Each of the multiple recesses 11 has an inertial ring fastening portion 11a formed therein, which is a fastening portion for fastening to an inertial ring (not shown). In this embodiment, the inertial ring fastening portion 11a is a circular through-hole that penetrates the cover plate 10 in the axial direction. However, if the inertial ring fastening portion 11a is to be used for purposes other than fastening the inertial ring, for example, if the inertial ring fastening portion 11a also serves as a through-hole for positioning, the shape of the inertial ring fastening portion 11a may be a shape other than a circle, for example, an ellipse or an elongated hole. The inertial ring is an annular member connected to a first rotating shaft, and the torque of the first rotating shaft acts on it. The inertial ring is a component for ensuring a predetermined moment of inertia, and the torque of the first rotating shaft acts on the inertial ring. Therefore, when the inertial ring is fastened to the cover plate 10, the torque on the first rotating shaft side is transmitted to the cover plate 10 while having a predetermined moment of inertia.

[0021] In this embodiment, the inertial ring is an annular member and has an annular plane having an inner and outer diameter substantially the same as the outer circumference 10b of the cover plate 10. In this embodiment, fastening is performed with the annular plane of the inertial ring in contact with the end face of the recess 11 on the first axial direction side. That is, the inertial ring has screw holes formed at positions corresponding to the inertial ring fastening portions 11a in the circumferential and radial directions, and fastening members are inserted into the inertial ring fastening portions 11a formed in the plurality of recesses 11 to fasten the inertial ring. In this embodiment, the fastening members that fasten the inertial ring to the cover plate 10 at the inertial ring fastening portions 11a are bolts.

[0022] (3) Support plate configuration: The support plate 20 is an annular member fastened to the cover plate 10. (Figure) Figures 8, 9, and 7B show the support plate 20. Figure 8 is a view of the support plate 20 removed from the torque fluctuation absorption device 1, along the axial direction from the transaxle side. Figure 9 is a view of the support plate 20 removed from the torque fluctuation absorption device 1, along the axial direction from the engine side. Figure 7B is a perspective view of the support plate 20 from the transaxle side.

[0023] The support plate 20 is a component formed by shaping a plate-shaped member into an annular form, and in most parts of the support plate 20, the thickness direction is oriented in the axial direction. The support plate 20 is a component fastened to the cover plate 10 and comprises an annular main body portion 20a and an extension portion 21 extending radially outward from the outer circumference of the main body portion 20a, and the plane to which the main body portion 20a belongs is located at a position shifted in the first axial direction relative to the plane to which the extension portion 21 belongs. That is, the main body portion 20a is located on the first direction side of the extension portion 21.

[0024] In this embodiment, the inner diameter Ris of the main body portion 20a is larger than the inner diameter Ric of the inner circumference portion 10a of the cover plate 10. Also, the outer diameter Ros of the main body portion 20a is approximately the same as the outer diameter Roc of the inner circumference portion 10a of the cover plate 10. The extension portion 21 is a part that extends radially outward from the outer circumference of the main body portion 20a. In this embodiment, there is a wall portion 22 that extends axially from the outer circumference of the main body portion 20a (see Figure 7B), and the extension portion 21 extends radially outward from the axial end of the wall portion 22.

[0025] The extension portion 21 is a plate-like portion having a plane oriented perpendicular to the axial direction, and multiple extension portions are formed discretely in the circumferential direction. The circumferential width of the extension portion 21 is adjusted so that it fits between the recesses 11 of the cover plate 10. Specifically, in the cover plate 10, the recesses 11 are formed with a predetermined depth D on the first axial direction side, so that a accommodating portion 11b is formed between the recesses 11 in the circumferential direction, on the first axial direction side of the outer periphery 10b, allowing the extension portion 21 to be positioned (see Figure 7A).

[0026] Since the circumferential width of the extension 21 is smaller than the circumferential width of the housing 11b, the cover plate 10 and the support plate 20 can be stacked by positioning the extension 21 in the housing 11b between the recesses 11, with the inner circumferential portion 10a and the main body portion 20a facing each other, as shown in Figures 1, 2, 3A, and 3B.

[0027] In this embodiment, there are two types of shapes for the extension portion 21. Here, one is called the first extension portion 21a and the other the second extension portion 21b. The first extension portion 21a is smaller than the second extension portion 21b, and the circumferential width W1 of the first extension portion 21a is smaller than the circumferential width W2 of the second extension portion 21b. In this embodiment, there are two types of circumferential distances for the recesses 11 formed in the cover plate 10: distance L1 and distance L2. In this embodiment, the first extension portion 21a is positioned between recesses 11 where the distance between them is distance L1, and the second extension portion 21b is positioned between recesses 11 where the distance between them is distance L2.

[0028] In each extension 21, the circumferential width is approximately constant. Furthermore, the radially outer end of the extension 21 approximately coincides with the radially outer end of the cover plate 10. In other words, when comparing the entire cover plate 10 with the entire support plate 20, their outer diameters are approximately equal.

[0029] Each of the multiple extensions 21 has a cover plate fastening portion 21c formed thereon, which is a fastening portion for fastening the cover plate 10 to the support plate 20. In this embodiment, the cover plate fastening portion 21c is a circular through hole that penetrates the support plate 20 in the axial direction. In this embodiment, one cover plate fastening portion 21c is formed in the approximately central part of the circumferential direction of the first extension 21a, and two cover plate fastening portions 21c are formed in each of the portions closer to both ends than the circumferential center of the second extension 21b.

[0030] On the other hand, on the outer periphery 10b of the cover plate 10, a support plate fastening portion 11c is formed between the recesses 11 in the circumferential direction, which is a fastening portion for fastening to the support plate 20. In this embodiment, the support plate fastening portion 11c is a circular through hole that penetrates the cover plate 10 in the axial direction. In this embodiment, one support plate fastening portion 11c is formed in the approximate center of the circumferential direction of the portion where the distance of the recess 11 is distance L1, and two support plate fastening portions 11c are formed in each of the portions closer to both ends of the circumferential direction than the center of the portion where the distance of the recess 11 is distance L2.

[0031] When the cover plate 10 and the support plate 20 are in contact in the axial direction, the cover plate fastening portion 21c and the support plate fastening portion 11c are formed to be in the same position in the circumferential and radial directions. Therefore, the cover plate 10 and the support plate 20 can be fastened by inserting and fastening the inter-plate fastening member 30 into the cover plate fastening portion 21c and the support plate fastening portion 11c. In this embodiment, the inter-plate fastening member 30 is a rivet (see Figures 1, 2, 3A, and 3B). When the support plate 20 and the cover plate 10 are fastened, torque is transmitted from the first rotation axis to the support plate 20 and the cover plate 10 via inertialing.

[0032] In this embodiment, the cover plate 10 and the support plate 20 sandwich an intermediate plate 2g, which is a member extending from the damper portion, via a sliding member and a biasing member. Specifically, as shown in Figure 4A, an annular disc spring 40 as a biasing member, a pressure plate 50 that applies the axial biasing force generated by the disc spring 40 to the sliding member 60, and the sliding member 60 are arranged between the cover plate 10 and the support plate 20. The sliding member 60 is an annular member that generates a predetermined coefficient of friction when the biasing force from the disc spring 40 is applied. The intermediate plate 2g, which extends radially from the damper portion 2, is sandwiched between the two sliding members 60. One of the sliding members 60 abuts against the cover plate 10, and the other of the sliding member 60 abuts against the pressure plate 50. The disc spring 40 is also arranged between the pressure plate 50 and the support plate 20.

[0033] With the above configuration, the biasing force of the disc spring 40 acts on the sliding member 60 via the pressure plate 50. The coefficient of friction between the sliding member 60 and the intermediate plate 2g is set so that they do not slip until the torque fluctuation between the first and second rotating shafts reaches a predetermined value, and once the predetermined value is reached, the sliding member 60 and the intermediate plate 2g begin to slip against each other. For this reason, the torque limiter unit 3 functions as a device that limits the torque transmitted between the first and second rotating shafts.

[0034] In the above configuration, the inertial ring is fastened to the cover plate 10 while the cover plate 10 and the support plate 20 are fastened together. In this state, with the inertial ring, cover plate 10 and support plate 20 fastened together, the extension portion 21 of the support plate 20 is located between the multiple recesses 11 of the cover plate 10. That is, the extension portion 21 is housed in the housing portion 11b formed between the multiple recesses 11, and the extension portion 21 and the inertial ring are unlikely to interfere with each other in the axial direction. With this configuration, it is possible to change the shape of the cover plate 10 and the inertial ring without changing the shape of the support plate 20.

[0035] For example, the required moment of inertia differs depending on the vehicle model, and the diameter of the inertial ring may be adjusted to match the weight corresponding to each moment of inertia. When the diameter of the inertial ring is adjusted, the radial position of the screw hole in the inertial ring is also adjusted, and the position of the inertial ring fastening portion 11a corresponding to the position of the screw hole is also adjusted, and as a result, the diameter of the cover plate 10 may also be adjusted. Even if the diameter of the cover plate 10 is adjusted in this way, if the position of the support plate fastening portion 11c on the cover plate 10 remains the same, fastening is possible by the cover plate fastening portion 21c of the support plate 20, so there is no need to change the diameter or shape of the support plate 20. Therefore, among the components of the torque fluctuation absorption device, the design change of the inertial ring can be accommodated by changing only the shape of the cover plate, and a torque fluctuation absorption device that can be easily reused for multiple targets can be provided.

[0036] When the design of the inertial mechanism is changed, there is no need to change the design of the support plate 20, and therefore no need to change the design of other parts. For example, there is no need to change the design of the side plates 2e and 2f. For this reason, it is possible to reduce the cost of the parts by separating the support plate 20 and the other parts from a single part by pressing. Here, the other parts only need to have an outer diameter smaller than the inner diameter of the support plate 20, be made of the same material as the support plate 20, and have approximately the same axial thickness. In this embodiment, such a part can be, for example, one of the side plates 2e and 2f mentioned above. For example, it is possible to take the support plate 20 and the side plate 2e from a single part.

[0037] Furthermore, the cover plate 10 according to this embodiment has a plurality of recesses 11, and wall surfaces 11d are formed on both circumferential ends and radially inward sides of the recesses 11 (see Figure 7A). As a result, the overall rigidity of the cover plate 10 is higher compared to a configuration in which the wall surfaces 11d are not formed. Moreover, in this embodiment, since the end faces on the first direction side of the recesses 11 are in contact with the inertial ring, a larger gap is formed between the inertial ring and the cover plate 10 compared to a configuration in which the cover plate 10 is substantially flat. As a result, even if water enters the inside of the torque fluctuation absorption device 1, it is possible to easily discharge the water to the outside of the torque fluctuation absorption device 1 due to centrifugal force associated with rotation during use.

[0038] Furthermore, in this embodiment, by adjusting the distance between the end face of the extension portion 21 on the first axial direction side and the end face of the recess 11 on the first axial direction side, it is configured so that there is no need to provide notches or the like in the inertial ring to prevent interference with the fastening member.

[0039] Specifically, as shown in Figure 3B, the distance L3 between the end face of the extension 21 on the first axial direction side (engine side) and the end face of the recess 11 on the first axial direction side is greater than the axial distance of the head 30a of the inter-plate fastening member 30 inserted into the cover plate fastening portion 21c. Therefore, the head 30a does not protrude beyond the end face of the recess 11 on the first axial direction side. Consequently, when the inertial ring is fastened to the end face of the recess 11 on the first axial direction side, the head 30a does not come into contact with the inertial ring. Therefore, it is not necessary to provide a notch on the inertial ring side to prevent interference with the head 30a.

[0040] Compared to a configuration in which a notch is provided to prevent interference with the head 30a in the inertial ring, in this embodiment, where a notch is unnecessary, the weight of the inertial ring can be easily secured. Therefore, there is less need to increase the diameter of the inertial ring, and the torque fluctuation absorption device 1 can be made compact. Furthermore, if a notch is present in the inertial ring, it can cause fracture due to stress concentration. However, with a configuration that does not require a notch, as in this embodiment, the possibility of fracture due to stress concentration is reduced, increasing the likelihood of manufacturing a product that meets the requirements even with a downgraded material.

[0041] Furthermore, in this embodiment, the diameter Lc1 of the cover plate 10 is greater than or equal to the diameter Ls1 of the support plate 20. Specifically, as shown in Figure 2, the diameter of the support plate 20 is the distance Ls1 between the rotation axis Ax and the outer circumference of the extension portion 21. The diameter Lc1 of the cover plate is greater than or equal to the diameter Ls1 of the support plate 20. That is, as the design of the inertial ring is changed, the diameter of the cover plate 10 may increase, potentially becoming larger than the diameter Lc1 of the cover plate 10 as shown in Figure 2, but the diameter Ls1 of the support plate 20 remains unchanged. Therefore, the diameter Lc1 of the cover plate 10 is greater than or equal to the diameter Ls1 of the support plate 20. With this configuration, the position of the support plate fastening portion 11c on the cover plate 10 is not changed, and the shape of the recess 11 is maintained, making it possible to make design changes such as increasing the diameter of the cover plate 10 in conjunction with a shape change that extends the plane and wall surface radially outward, or changing the drawing depth of the recess 11. Furthermore, if changing the shape of the recess 11 does not cause cracking of the inertial fastening portion 11a, the wall surface 11d, or the support plate fastening portion 11c, then when increasing the diameter of the cover plate 10, the plane of the recess 11 may be widened in the circumferential direction. With the above configuration, even if a design change to the cover plate 10 occurs due to a design change to the inertial, a configuration is realized in which there is no need to redesign the support plate 20.

[0042] Furthermore, as shown in Figure 2, in this embodiment, the distance Lc2 from the rotation axis Ax to the innermost part of the inertial fastening portion 11a is smaller than the distance Ls2 from the rotation axis Ax to the outermost part of the cover plate fastening portion 21c. That is, in this embodiment, the inertial fastening portion 11a is located in the recess 11, and the cover plate fastening portion 21c is located in the extension portion 21. Since the recess 11 and the extension portion 21 are located at different positions in the circumferential direction, the inertial fastening portion 11a and the cover plate fastening portion 21c are also located at different positions in the circumferential direction.

[0043] Therefore, in the radial direction, the inertial fastening portion 11a and the cover plate fastening portion 21c can be arranged to overlap. If it is necessary to arrange the inertial fastening portion 11a and the cover plate fastening portion 21c so that they do not overlap in the radial direction, it is necessary to arrange them far enough apart in the radial direction, which would increase the radial size of the torque fluctuation absorption device 1. However, according to this embodiment, the inertial fastening portion 11a and the cover plate fastening portion 21c can be arranged to overlap in the radial direction, so the torque fluctuation absorption device 1 can be made more compact.

[0044] Furthermore, the components of the torque fluctuation absorption device 1 may be configured to allow assembly after deformation, taking into account deformation during assembly. Figure 10A is a diagram showing a portion of the cross-sectional view of Figure 4A. In this embodiment, a disc spring 40, a pressure plate 50, a sliding member 60, and an intermediate plate 2g are sandwiched between the cover plate 10 and the support plate 20. The disc spring 40 applies a biasing force to the sliding member 60 via the pressure plate 50. Therefore, the biasing force of the disc spring 40 acts as a force that rotates the cover plate 10 in a counterclockwise direction, as indicated by the arrow At in Figure 10A.

[0045] Therefore, the state of the cover plate 10 shown in Figure 10A is the state after deformation due to the biasing force of the disc spring 40. In this embodiment, the shape of the cover plate 10 is designed to take into account the deformation due to the biasing force of the disc spring 40 and to be in the state shown in Figure 10A after deformation. Specifically, when the fastening of the cover plate 10 with the support plate 20 is released, the end face of the recess on the first axial direction side is located on the second axial direction side as it moves from the radially inward to the radially outward side.

[0046] Figure 10B shows the cover plate 10 in a state where it has been released from fastening to the support plate 20, in the same cross-sectional view as in Figure 10A. As shown in Figure 10B, the shape of the cover plate 10 in a state where it has been released from fastening to the support plate 20 is different from the shape of the cover plate 10 after it has been fastened to the support plate 20.

[0047] Specifically, excluding the wall surface 11d and end face 11f between the inner circumference 10a and the recess 11, the end face 11e of the recess on the first axial direction side is located on the second axial direction side as it moves from the radially inner side to the radially outer side. That is, it is configured to be rotated in the opposite direction to the arrow At shown in Figure 10A. In this embodiment, the configuration is applied in which the end face 11e is located on the second axial direction side as it moves from the radially inner side to the radially outer side, but the end face 11f may also be configured to be located on the second axial direction side as it moves from the radially inner side to the radially outer side, similar to the end face 11e (see Figure 11).

[0048] Furthermore, in the cover plate 10, the position of the inertial fastening portion 11a is also formed so that, after deformation, it coincides with the fastening portion on the inertial side. That is, when the cover plate 10 is fastened to the support plate 20, the position of the inertial fastening portion 11a changes slightly radially inward. In this embodiment, anticipating this deformation, the position of the inertial fastening portion 11a before deformation, shown in Figure 10B, is positioned radially outward than the position of the inertial fastening portion 11a after deformation, shown in Figure 10A. This configuration is just one example, and the shape of the inertial fastening portion 11a may be a shape that encompasses the positions of the inertial fastening portion 11a before and after deformation. For example, it may be an elongated hole shape that connects two circular holes. Also, if a hole for positioning purposes, a so-called knock pin hole, is provided on the end face of the recess 11, it may be similarly positioned radially outward or have a similar encompassing shape.

[0049] With the above configuration, when the cover plate 10 and the support plate 20 are fastened together, the end face 11e on the first direction side of the recess 11 of the cover plate 10 faces in a direction perpendicular to the axial direction (dashed line shown in Figure 10B) and comes into contact with the plane of the inertial ring with virtually no gap. In addition, the position of the inertial ring fastening portion 11a coincides with the position of the fastening portion on the inertial ring side. Therefore, the cover plate 10 and the inertial ring can be easily fastened together.

[0050] Furthermore, in the torque fluctuation absorption device 1 according to this embodiment, positioning portions are formed on the cover plate 10 and the support plate 20 for positioning during the manufacturing process. That is, during the manufacturing process of the torque fluctuation absorption device 1, the cover plate 10 and the support plate 20 are placed facing each other so that the positions of the support plate fastening portion 11c and the cover plate fastening portion 21c coincide, and the two are fastened together by the inter-plate fastening member 30.

[0051] In order to perform such a fastening process, it is necessary to position the cover plate 10 and the support plate 20 so that the positions of the support plate fastening portion 11c and the cover plate fastening portion 21c coincide. In this embodiment, positioning portions for such positioning are formed on the cover plate 10 and the support plate 20.

[0052] Specifically, as shown in Figures 5, 6, and 7A, engagement holes 11g for engaging the pressure plate 50 are formed in the inner circumference 10a of the cover plate 10. The engagement holes 11g are substantially rectangular through holes that penetrate in the axial direction. In this embodiment, the engagement holes 11g are formed in the radially outer portion of the inner circumference 10a, and the positions of the engagement holes 11g are equally spaced in the circumferential direction. In addition, in this embodiment, engagement holes 11g are formed in three locations on the inner circumference 10a.

[0053] The engagement hole 11g is located approximately in the center between adjacent recesses 11 in the circumferential direction. Furthermore, the circumferential distance L2 between recesses 11 that enclose the engagement hole 11g is longer than the circumferential distance L1 between recesses 11 that do not enclose the engagement hole 11g. In other words, the engagement hole 11g is formed in the inner circumferential portion 10a in the radially inner portion of the region formed between the recesses 11 on the outer circumferential portion 10b where the circumferential distance is longer.

[0054] The engagement hole 11g is a hole that engages with the engagement portion 51 formed in the pressure plate 50. Figure 10C is a perspective view of the pressure plate 50 from the transaxle side. The pressure plate 50 is a member that receives the biasing force of the disc spring 40 and transmits the biasing force to the sliding member 60, and comprises an annular main body portion 52 and an engagement portion 51. The main body portion 52 is a plate-shaped annular shape, with the thickness direction of the plate facing the axial direction. The engagement portion 51 is a substantially rectangular plate-shaped portion that extends axially from three locations on the outer circumference of the main body portion 52. The engagement portion 51 engages with the engagement hole 11g and is a structure that prevents the cover plate 10 and the pressure plate 50 from rotating relative to each other in the circumferential direction around the rotation axis Ax.

[0055] In the circumferential direction, positioning portions 11h and 11i are formed on the outer peripheral portion 10b of the cover plate 10 between the recesses 11 that sandwich the engagement hole 11g, radially outward from the engagement hole 11g. In this embodiment, the positioning portions 11h and 11i are notches that penetrate in the axial direction. That is, the radially inner shape of the positioning portions 11h and 11i is arc-shaped, and the radially outer state continues to the outermost part of the cover plate 10, forming a notch. In this embodiment, the circumferential width of the positioning portion 11i is greater than that of the positioning portion 11h.

[0056] When the cover plate 10 and the support plate 20 are placed facing each other, the second extension 21b is positioned in the circumferential direction at a location corresponding to the location where the engagement hole 11g exists. That is, the extension 21 located between the recesses 11 that sandwich the engagement hole 11g in the circumferential direction is the second extension 21b. The second extension 21b has a window portion 21d formed therein, which is a hole that penetrates axially at a location that overlaps with the engagement hole 11g in the radial and circumferential directions (see Figures 7B, 8, and 9).

[0057] Specifically, the wall portion 22 between the second extension 21b and the main body 20a is located at both ends in the circumferential direction and does not exist in the center in the circumferential direction, and the portion where the wall portion 22 does not exist is the window portion 21d. It can also be considered that the second extension 21b is a structure formed by arranging the first extensions 21a extending from the main body 20a at equal intervals in the circumferential direction, and connecting adjacent first extensions 21a in the circumferential direction at three equally spaced locations in the circumferential direction.

[0058] In the second extension 21b, positioning portions 21e and 21f are formed radially outward from the window portion 21d. In this embodiment, the positioning portions 21e and 21f are notches that penetrate in the axial direction. That is, the radially inner shape of the positioning portions 21e and 21f is arc-shaped, and the radially outer state continues to the outermost part of the cover plate 10, forming a notch. In this embodiment, the positioning portion 21e has a larger circumferential width than the positioning portion 21f.

[0059] In the above configuration, the positioning section 21e and the positioning section 11i are located at the same position in the radial and circumferential directions, and the positioning section 21f and the positioning section 11h are located at the same position in the radial and circumferential directions. Therefore, by inserting a pin or the like into each positioning section, the cover plate 10 and the support plate 20 can be positioned in the radial and circumferential directions. In this embodiment, the positioning sections 11h, 11i, 21e, and 21f are used for positioning during transport and for positioning during fastening.

[0060] Specifically, the positioning sections 11i and 21e are used when transporting the torque fluctuation absorption device 1 in a temporarily assembled state. That is, when the cover plate 10, the support plate 20, and multiple components including the members between these plates are temporarily assembled, the temporarily assembled torque fluctuation absorption device 1 is transported to the work area where the fastening process is performed. The transport is carried out with the temporarily assembled torque fluctuation absorption device 1 being gripped by the transport device. When the torque fluctuation absorption device 1 is gripped by the transport device, the transport is performed with pins inserted into the positioning sections 11i and 21e. With this configuration, the cover plate 10 and the support plate 20 can be transported without separating in the circumferential and radial directions.

[0061] In the work area of ​​the fastening process, the cover plate 10 and the support plate 20 are placed in the work area and fastened together by the inter-plate fastening member 30. At this time, the cover plate 10 and the support plate 20 need to be positioned in the radial and circumferential directions. In this embodiment, pins are provided in the work area at positions corresponding to the positioning parts 11h and 21f, and the torque fluctuation absorption device 1, which is temporarily assembled in the work area, is set up so that the pins are inserted into the positioning parts 11h and 21f. With this configuration, the fastening process can be performed with the cover plate 10 and the support plate 20 positioned in the circumferential and radial directions. With the above configuration, it becomes possible to perform the fastening process with the cover plate 10 and the support plate 20 accurately positioned in the temporarily assembled torque fluctuation absorption device 1.

[0062] Furthermore, the region in the cover plate 10 where the positioning portions 11h and 11i are formed is the region between the recesses 11 that sandwich the engagement hole 11g in the circumferential direction. Therefore, the positioning portions 11h and 11i can be formed in a region wider in the circumferential direction than the housing portion 11b that accommodates the first extension portion 21a. Also, the second extension portion 21b on which the positioning portions 21e and 21f are formed is longer in the circumferential direction than the first extension portion 21a. Therefore, sufficient space can be secured for forming the positioning portions 21e and 21f. With this configuration, the positioning portions 11h, 11i, 21e, and 21f can be formed in positions that do not interfere with the support plate fastening portion 11c and the cover plate fastening portion 21c for inserting the inter-plate fastening member 30.

[0063] Furthermore, in this embodiment, the positioning portions 11h and 11i are located radially outside the engagement hole 11g, the positioning portions 21e and 21f are located radially outside the window portion 21d, and the support plate fastening portion 11c and cover plate fastening portion 21c are located in different positions in the circumferential direction from the positioning portions 11h, 11i, 21e, 21f, the engagement hole 11g, and the window portion 21d. Therefore, it is not necessary to bring the through-holes, the support plate fastening portion 11c and cover plate fastening portion 21c, and the through-notches, the positioning portions 11h, 11i, 21e, and 21f, too close together. For this reason, compared to a configuration in which the positioning portion is provided on the first extension portion 21a, for example, the possibility of the support plate fastening portion 11c and cover plate fastening portion 21c cracking due to the positioning portions 11h, 11i, 21e, and 21f can be reduced.

[0064] (4) Other embodiments: The embodiments described above are merely examples for carrying out the present invention, and various other embodiments can be adopted. For example, the shape, size, and number of each component are not limited. For instance, the shape, size, and number of the recesses 11 in the cover plate 10, and the shape, size, and number of the extensions 21 in the support plate 20 are not limited to the same configuration as in the embodiments described above, and various configurations can be adopted.

[0065] Furthermore, the number of positioning parts 11h, 11i, 21e, and 21f is not limited to a configuration where two are formed in each of the three locations on the cover plate 10 and the support plate 20. For example, one may be formed on the radially outer side of each of the three engagement holes 11g on the cover plate 10, or there may be more. Also, positioning parts may be formed in some of the three engagement holes 11g, for example, in two locations. Moreover, the part that takes into account the deformation caused by the biasing force of the disc spring 40 and ensures that the part becomes the correct shape at the time of assembly after being deformed by the biasing force before assembly is not limited to the cover plate 10. For example, the shape of the support plate 20 in the released state may be adjusted so that the support plate 20 becomes the correct shape at the time of assembly after the shape has changed. In addition, the shapes of various other members may be changed.

[0066] The cover plate can be any annular member fastened to an inertial ring connected to the first rotating shaft. That is, the cover plate should be configured such that, when fastened to the inertial ring, the torque of the first rotating shaft is transmitted to the cover plate via the inertial ring. The first rotating shaft can be any member that rotates about an axis and transmits torque to the inertial ring and the cover plate. The device to which the first rotating shaft is connected can be any device, and is not limited to an engine as in the embodiment described above. Various rotary drive devices such as transaxles, transmissions, and rotating electric machines may be connected to the first rotating shaft.

[0067] The inertial ring can be any component that ensures the moment of inertia, and its shape, size, weight, and material may be such that they ensure the required moment of inertia for each application to which the torque fluctuation absorption device is applied. The shape of the cover plate can be annular. That is, a circular hole can be formed on the radially inner side of the cover plate, and the outer circumference can be circular. However, there are no constraints that the inner circumference or outer circumference must be strictly circular, and various shapes and structures can be formed on the inner circumference or outer circumference.

[0068] The support plate can be any annular member fastened to the cover plate. That is, the support plate should be configured such that the torque of the first rotating shaft is transmitted to the support plate via the inertial ring and the cover plate when fastened to the cover plate. The shape of the support plate can be annular. That is, a circular hole should be formed on the radially inner side of the support plate, and the outer circumference should be circular. However, there are no restrictions on the inner or outer circumference being strictly circular, and various shapes and structures may be formed on the inner and outer circumferences.

[0069] The plate fastening member can be any member used to fasten the cover plate and the support plate, and is not limited to rivets as described above. For example, it could be a screw, bolt, or the like.

[0070] The damper section can be any mechanism connected to the second rotating shaft. That is, it can be any mechanism that can rotate in conjunction with the second rotating shaft and that absorbs the torque difference between the first rotating shaft and the second rotating shaft. In the above embodiment, the damper section is a mechanism having a coil spring, but it is not limited to such a mechanism, and the damper section may be constructed using various elastic bodies. Furthermore, the number of elastic bodies is not limited and may be in various forms.

[0071] The torque limiter section should function by sandwiching a member extending from the damper section between a cover plate and a support plate, via a sliding member and a biasing member, and allowing slippage when the torque fluctuation between the first and second rotating shafts reaches a predetermined value. In other words, the torque limiter section enables torque transmission between the torque limiter section and the damper section by frictional force, but the sliding member slips when the torque fluctuation between the first and second rotating shafts reaches a predetermined value. As a result, it is sufficient that the torque fluctuation between the first and second rotating shafts is limited.

[0072] The sliding member can be any member that applies frictional force to the member extending from the damper portion, and its material and shape are not limited, but it is preferably annular in shape so that frictional force can be applied around the entire circumference of the rotation axis. The biasing member is a member that applies a biasing force to the sliding member side between the cover plate and the support plate, and it is sufficient that it can apply a biasing force so that the sliding member comes into contact with the member extending from the damper portion. For this reason, its material and shape are not limited, but it is preferably an annular disc spring so that a biasing force can be applied around the entire circumference of the rotation axis.

[0073] Furthermore, the recesses in the cover plate may have a predetermined depth on the first axial direction side and be recesses in which inertial fastening portions, which are fastening portions for fastening with the inertial ring, are formed, and these portions may be discretely arranged in the circumferential direction. In other words, the cover plate is annular, but in the axial direction, the recesses have a predetermined depth on the first direction side. The portions other than the recesses may be portions to which the extension of the support plate is fastened, and for example, they may be composed of plate-like portions that do not have depth in the axial direction.

[0074] The first axial direction is the direction in which the inertial ring exists in the axial direction. That is, in multiple recesses, the position of the end face on the first axial direction side is the same, and the inertial ring is fastened to the cover plate with the end face on the first axial direction side in contact with the inertial ring. In this way, since the inertial ring contacts the recess at the same position on the first axial direction side, the contact surfaces are on the same plane.

[0075] The depth of the recess is not limited, but it is preferable that the depth of the recess is such that an extension is placed between adjacent recesses and the extension does not interfere with the inertial ring; in other words, the depth of the recess in the axial direction is greater than the thickness of the extension. The inertial ring fastening portion only needs to be configured so that the inertial ring can be fastened to the cover plate by a fastening member. Therefore, it may be composed of holes, screw holes, notches, etc.

[0076] Furthermore, the recesses only need to be discretely arranged in the circumferential direction. That is, multiple recesses should be formed at predetermined distances apart in the circumferential direction. The distance between recesses may be constant or not. For example, in the former case, the distance between some recesses may be a constant first distance, and the distance between the remaining recesses may be a constant second distance. Furthermore, the number of recesses is not limited. In any case, the discrete arrangement in the circumferential direction should create space for attaching the extension. Moreover, in the above embodiment, the recesses are obtained by deep drawing, but the method for forming the recesses is not limited to deep drawing.

[0077] The support plate fastening portion is a part formed on the cover plate, and it is sufficient to be a fastening portion for fastening the support plate between recesses in the circumferential direction. In other words, the support plate fastening portion is sufficient to be configured so that the support plate can be fastened to the cover plate by an inter-plate fastening member. Therefore, it may be composed of holes, screw holes, notches, etc.

[0078] The extension portion of the support plate extends radially outward from the outer circumference of the annular main body and is positioned between recesses in the circumferential direction. This extension portion is where the cover plate fastening portion, which is a fastening portion for fastening to the cover plate, is formed. In other words, the support plate has at least a main body and an extension portion. The shape of the main body of the support plate only needs to be annular. That is, a circular hole is formed on the radially inner side of the main body of the support plate, and the outer circumference of the portion excluding the extension portion needs to be circular. However, there are no restrictions that the inner circumference or outer circumference must be strictly circular, and various shapes and structures may be formed on the inner circumference or outer circumference.

[0079] The extension portion is a part that extends radially outward from the main body and is positioned between the recesses. The shape and number of extension portions are not limited. Therefore, extension portions do not need to be formed in all of the space between the recesses. Also, the shapes of multiple extension portions may differ. Furthermore, the extension portion may extend directly radially outward from the main body, or it may have a wall surface that extends in a direction other than radially from the main body, for example, in the axial direction, and extend further radially outward from that wall surface. The cover plate fastening portion is a fastening portion for fastening to the cover plate. That is, the cover plate fastening portion is configured so that the cover plate can be fastened to the support plate by the inter-plate fastening member. Therefore, it may be composed of holes, screw holes, notches, etc. The number of extension portions and the number and size of the parts fastened by the inter-plate fastening member may be adjusted, for example, according to the fastening force required to fasten the cover plate and the support plate. [Explanation of symbols]

[0080] 1... Torque fluctuation absorption device, 2... Damper section, 2a... Hub member, 2b... Flange section, 2c... Coil spring, 2d... Elastic member, 2e... Side plate, 2f... Side plate, 2g... Intermediate plate, 3... Torque limiter section, 10... Cover plate, 10a... Inner circumference section, 10b... Outer circumference section, 11... Recess, 11a... Inertial fastening section, 11b... Housing section, 11c... Support plate fastening section, 11d... Wall surface, 11e... End surface, 11f... End Surface, 11g…Engagement hole, 11h…Positioning part, 11i…Positioning part, 20…Support plate, 20a…Main body part, 21…Extension part, 21a…First extension part, 21b…Second extension part, 21c…Cover plate fastening part, 21d…Window part, 21e…Positioning part, 21f…Positioning part, 22…Wall surface part, 30…Plate fastening member, 30a…Head, 40…Disc spring, 50…Pressure plate, 51…Engagement part, 52…Main body part, 60…Sliding member

Claims

1. An annular cover plate fastened to an inertial ring connected to the first rotating shaft, An annular support plate fastened to the cover plate, A plate-to-plate fastening member used for fastening the cover plate and the support plate, A damper section connected to the second rotating shaft, A torque limiter section that sandwiches a member extending from the damper section between the cover plate and the support plate via a sliding member and a biasing member, and allows slippage when the torque fluctuation between the first rotation shaft and the second rotation shaft reaches a predetermined value, A torque fluctuation absorption device equipped with, The aforementioned cover plate is A recess having a predetermined depth on the first axial direction side, and having an inertial fastening portion which is a fastening portion for fastening with the inertial ring, wherein the recess has a plurality of recesses discretely arranged in the circumferential direction, Between the recesses in the circumferential direction, there is a support plate fastening portion which is a fastening portion for fastening to the support plate, The aforementioned support plate is An extension portion extending radially outward from the outer circumference of the annular main body portion and positioned between the recesses in the circumferential direction, having an extension portion on which a cover plate fastening portion is formed for fastening to the cover plate, In the plurality of recesses, the positions of the end faces on the first axial direction side are the same, and with the end faces on the first axial direction side in contact with the inertial ring, the inertial ring is fastened to the cover plate by a fastening member at the inertial ring fastening portion. The cover plate and the support plate are fastened together by the plate-to-plate fastening member at the support plate fastening portion and the cover plate fastening portion. Torque fluctuation absorption device.

2. The distance between the end face of the extension on the first axial direction side and the end face of the recess on the first axial direction side is greater than the axial distance of the head of the inter-plate fastening member inserted into the cover plate fastening portion. Torque fluctuation absorption device according to claim 1.

3. The diameter of the cover plate is greater than or equal to the diameter of the support plate. Torque fluctuation absorption device according to claim 1 or claim 2.

4. The distance from the axis of rotation to the innermost part of the inertial fastening portion is smaller than the distance from the axis of rotation to the outermost part of the cover plate fastening portion. Torque fluctuation absorption device according to claim 1 or claim 2.

5. In a state where the fastening to the support plate is released, On the end face of the cover plate on the first axial direction side, at least the end face of the recess is located on the second axial direction side as it moves from the radially inward to the radially outward side. Torque fluctuation absorption device according to claim 1 or claim 2.

6. The torque limiter section is, The aforementioned biasing member is an annular disc spring, The system comprises a pressure plate that applies the axial biasing force generated by the disc spring to the sliding member, The aforementioned pressure plate is It is equipped with an engaging portion that engages with the cover plate, The aforementioned cover plate is It is equipped with an engagement hole that engages with the aforementioned engagement portion, The engagement hole is located between adjacent recesses in the circumferential direction, and the circumferential distance between the recesses that sandwich the engagement hole is longer than the circumferential distance between the recesses that do not sandwich the engagement hole. The extension portion located between the recesses that sandwich the engagement hole is longer in the circumferential direction than the extension portion located between the recesses that do not sandwich the engagement hole. Between the recesses that sandwich the engagement hole, a positioning portion is formed at least at one location between the cover plate and the extension, which is a hole or notch that penetrates axially at the same position in the radial and circumferential directions. Torque fluctuation absorption device according to claim 1 or claim 2.

7. The extension portion located between the recesses that sandwich the engagement hole has a window portion formed therein, which is a hole that penetrates axially at a position that overlaps with the engagement portion in the radial and circumferential directions, the positioning portion is located radially outside the window portion, and the cover plate fastening portion is located in a position different from the positioning portion and the window portion in the circumferential direction. Torque fluctuation absorption device according to claim 6.

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