Damper with torque limiter

Abstract

The invention relates to a damper with a torque limiter. The present invention is provided with: a pair of side plates disposed so as to be separated from each other in the direction along the shaft core of an input shaft of a travel transmission device; a friction-type limiter part that is housed in a space between the pair of side plates on the outside in the radial direction of the pair of side plates, and that slides when the load torque exceeds a threshold value; and a damper part which is disposed in a region of the pair of side plates closer to the shaft core than the stopper part, and which absorbs transmission of the driving force by elastic deformation of the spring as the load torque increases, the pair of side plates having a contact part at a position intermediate the stopper part and the damper part in the radial direction, the contact part bringing the opposing surfaces of the pair of side plates into contact with each other.

Description

Technical Field

[0001] This invention relates to a damper with a torque limiter. Background Technology

[0002] In Patent Document 1, a damper with a torque limiter (in Patent Document 1, it is a torque variation absorption device) is described as having a structure in which a limiter part is arranged on the outer periphery, a hysteresis part is arranged on the inner periphery, and a damper part is arranged in the middle of them in the radial direction.

[0003] The limiter part of the patent document 1 includes: a pair of plates fixed to the outer periphery of a flywheel that rotates by the driving force of an engine; and a pair of friction materials, a disc spring, a push plate, and a liner clamped to the inner periphery of the pair of plates.

[0004] The damper with torque limiter is supported by a liner being clamped to the outer periphery of a pair of side plates connected to the damper section and fixed by rivets. Additionally, the torque limiter has a hub component that engages with the transmission-side rotating shaft, and this hub component has a flange.

[0005] The damper portion of the damper with torque limiter has a helical spring with seat members at both ends, the seat members being embedded in a pair of side plates and a window formed in the flange portion of the hub member.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-230162

[0007] The damper with a torque limiter described in Patent Document 1 limits the transmission of excessive load torque by causing a pair of friction materials and bushings in the limiter section to rotate relative to each other as the load torque between the engine-side rotation shaft and the transmission-side rotation shaft changes. Furthermore, when the side plate and hub component rotate relative to each other as the load torque changes, the damper with the torque limiter absorbs the variation in load torque by applying compressive force to the coil spring via the seat component.

[0008] However, the damper with torque limiter described in Patent Document 1 is a separate structural component of the limiter section and the damper section, which leads to an increase in the number of components and an increase in the cost of assembly. Summary of the Invention

[0009] For this reason, a damper with a torque limiter is sought that can reduce the number of parts and can be assembled at low cost.

[0010] The damper with torque limiter of the present invention has the following structure: it is a damper with torque limiter that limits the transmission of driving force from the internal combustion engine to the driving transmission device when the load torque from the internal combustion engine of the vehicle to the driving transmission device exceeds a threshold. It comprises: a pair of side plates that are separated and arranged in the direction of the shaft center along the input shaft of the driving transmission device; a friction-type limiter portion that is housed in the space between the pair of side plates on the radially outer side of the pair of side plates and slides when the load torque exceeds the threshold; and a damper portion that is arranged in the pair of side plates in a region closer to the shaft center than the limiter portion, and absorbs the transmission of driving force by the elastic deformation of a spring as the load torque increases. The pair of side plates have a contact portion at the midpoint between the limiter portion and the damper portion in the radial direction, which allows the opposing surfaces to contact each other.

[0011] For example, it is also considered to assemble the limiter section and damper section separately, and integrate them using connecting components such as sheet metal or rods to form a damper with a torque limiter. However, it is believed that such a structure using connecting components would lead to an increase in the number of parts and an increase in assembly steps. In contrast, according to this structure, the limiter section is housed radially outside a pair of side plates, and the damper section is arranged radially inside the pair of side plates, so connecting components and connection steps are not required. In addition, by forming a contact portion in the pair of side plates at the midpoint of the radial direction between the limiter section and the damper section, the undesirable situation of the spacing between the pair of side plates becoming too narrow can be suppressed. In particular, in this structure, since a pair of side plates has both a limiter section and a damper section, a dedicated structure for transmitting torque to the limiter section and the damper section is not required. Therefore, a damper with a torque limiter can be constructed that reduces the number of parts and can be assembled at low cost. Attached Figure Description

[0012] Figure 1 This is a longitudinal sectional side view of a damper with a torque limiter.

[0013] Figure 2 This is a longitudinal sectional side view showing the limiter section and the damper section.

[0014] Figure 3 This is a longitudinal sectional side view showing the limiter section and the hysteresis section.

[0015] Figure 4 This is a partial sectional front view showing a damper with a torque limiter.

[0016] Figure 5 This is a front view showing the contact state between the limiting protrusion of the flange and the first bulge.

[0017] Figure 6 This is the front view of the front and back identification marks representing another implementation (b).

[0018] Figure 7 This is a cross-sectional view showing the front and back identification marks of another embodiment (b).

[0019] Figure 8 This is a cross-sectional view showing the friction mechanism of another embodiment (c).

[0020] Figure 9 This is a cross-sectional view showing the friction mechanism of another embodiment (d).

[0021] Figure 10 This is a cross-sectional view showing the friction mechanism of another embodiment (d).

[0022] Figure 11 This is a cross-sectional view showing the friction mechanism of another embodiment (e).

[0023] Figure 12 This is a cross-sectional view showing the friction mechanism of another embodiment (f). Detailed Implementation

[0024] The following describes an embodiment of the damper with a torque limiter according to the present invention, with reference to the accompanying drawings.

[0025] In this embodiment, as an example of damper A with a torque limiter, in Figure 1 The position shown is provided with a limiter part T and a damper part D. Their structure and their positional relationship are not limited to the following embodiments. Various modifications can be made without departing from its purpose.

[0026] [Basic Structure]

[0027] like Figures 1-3 As shown, a damper A with a torque limiter is positioned in the transmission path that transmits the driving force of a flywheel 1 (an example of a driving rotating body) that rotates integrally with the crankshaft of the vehicle's engine (not shown, an internal combustion engine) to the input shaft 2 of a driving transmission device TM, such as the vehicle's transmission. For this damper A with a torque limiter, the driving rotating body is not limited to the flywheel 1; it can also be a component that transmits driving force from the flywheel's mass. Furthermore, the engine uses gasoline or hydrogen as fuel to rotate the crankshaft.

[0028] The damper A with torque limiter protects the drive transmission device TM by limiting the transmission of high torque loads from the engine immediately after engine start-up. Furthermore, the damper A with torque limiter also protects the drive transmission device TM by limiting the transmission of high torque loads from the tires when the vehicle is traveling on rough roads.

[0029] The damper A with torque limiter can be installed not only in hybrid vehicles (HV vehicles) that transmit the driving force of the engine and the driving force of the drive motor to the drive transmission device TM, but also in non-hybrid vehicles that do not use a drive motor.

[0030] [Side panel]

[0031] like Figures 1-3 As shown, the damper A with torque limiter has a hub 3 embedded in the input shaft 2 of the travel transmission device TM. The damper A with torque limiter has a pair of side plates P, namely a first side plate 11 and a second side plate 12, which are separated in the direction of the shaft core X (which is the same as the shaft core of the user input shaft 2) that is the center of rotation of the hub 3.

[0032] In addition, the first side plate 11 and the second side plate 12 are examples of side plate P. The side plate located near the flywheel 1 is referred to as the first side plate 11, and the side plate located near the travel transmission device TM is referred to as the second side plate 12.

[0033] like Figures 1-4 As shown, the first side plate 11 and the second side plate 12 are disc-shaped with the shaft core X as the center, and a hole centered on the shaft core X is formed in the center, and the hub 3 is housed in the hole.

[0034] The damper A with torque limiter has: a limiter portion T disposed on the outer periphery of the side plate P, a plurality of (four in this embodiment) damper portions D disposed at a position closer to the shaft core X than the limiter portion T, and a hysteresis portion H disposed on the outer periphery of the hub 3 which becomes the inner periphery of the damper portion D.

[0035] Furthermore, the damper A with torque limiter has multiple (in this embodiment, four) contact portions C formed radially between the limiter portion T and the damper portion D on a pair of side plates P (first side plate 11 and second side plate 12). The multiple contact portions C are through which rivets 6 are inserted in a direction parallel to the shaft core X, and the pair of side plates P are connected by the rivets 6 at the positions of the multiple contact portions C.

[0036] [Limiter Section]

[0037] like Figures 1-3 As shown, the limiter portion T is housed on the outer periphery of the first side plate 11 and the second side plate 12 in an outer peripheral space S1 formed between the first side plate 11 and the second side plate 12. This outer peripheral space S1 is an example of a space formed between a pair of side plates P on the radially outer side of the pair of side plates P.

[0038] The limiter unit T includes: a liner 14 formed of an annular plate fixed to the flywheel 1; a first friction material 15 disposed at a position in contact with the liner 14; a pressure plate 17 engaging with the first friction material 15; a disc spring 18 (an example of a force-applying component) that applies contact pressure to the pressure plate 17; and a second friction material 19 supported on the outer periphery of the second side plate 12 and in contact with the liner 14. These components are housed in the outer peripheral space S1. In particular, the first friction material 15, the pressure plate 17, the disc spring 18, and the second friction material 19 that apply frictional force to the liner 14 are sometimes referred to as the friction action mechanism F.

[0039] The inner circumferential side of the liner 14 is sandwiched between a first friction material 15 and a second friction material 19. The liner 14 has a plate-shaped connecting portion 14P integrally formed on its outer circumference. This connecting portion 14P is a region for connecting with the flywheel 1 and has an abutting surface 14S that abuts against the connected surface of the flywheel 1.

[0040] According to this structure, the liner 14 makes the contact surface 14S of the connecting part 14P abut against the connected surface of the flywheel 1, and inserts a plurality of connecting bolts 16 into a plurality of holes in the connecting part 14P, thereby connecting and fixing it to the flywheel 1 by tightening.

[0041] In particular, in order to prevent the contact surface 14S of the connecting part 14P from being misaligned when the connecting part 14P is connected and fixed to the flywheel 1, the damper A with torque limiter has a positive and negative identification mark G formed on the connecting part 14P of the liner 14.

[0042] like Figure 2 , Figure 4 As shown, the front and back identification mark G is formed by stamping, making the contact surface 14S of the connecting part 14P circularly concave, and the opposite side of the contact surface 14S circularly convex. The convex part of the front and back identification mark G is formed at the position where it contacts the connected surface of the flywheel 1 when the front and back of the connecting part 14P are confused and assembled.

[0043] Therefore, when connecting the liner 14 to the flywheel 1, if the front and back of the connecting part 14P are reversed and the assembly is performed incorrectly, the convex part of the front and back identification mark G will come into contact with the connected surface of the flywheel 1, and the connecting part 14P will float from the connected surface of the flywheel 1, thus identifying the assembly error.

[0044] The disc spring 18 is formed from a ring-shaped spring plate centered on the shaft core X, such that the outer circumference or circumferential portion abuts against the inner surface of the first side plate 11, and the inner circumference or circumferential portion abuts against the pressure plate 17. Thus, the force of the disc spring 18 acts on the first friction material 15.

[0045] like Figure 3 , Figure 4 As shown, the pressure plate 17 engages with the second side plate 12 in part, and the engaging protrusion 17a engages with the hole in the second side plate 12, thereby preventing the first friction material 15 from rotating and positioning it radially. Furthermore, the first friction material 15 is prevented from rotating and positioned radially by engaging the protrusion 17T formed on the pressure plate 17 with the hole formed on the first friction material 15. Additionally, the second friction material 19 is prevented from rotating and positioned radially by engaging the protrusion 12T formed on the second side plate 12 with the hole formed on the second friction material 19.

[0046] When the load torque is less than the threshold, the limiter unit T maintains the first friction material 15 and the liner 14 in a pressed state, and maintains the second friction material 19 and the liner 14 in a pressed state, thereby causing the flywheel 1 and the pair of side plates P to rotate as a whole.

[0047] In contrast, such as Figure 2 As shown, when the load torque exceeds the threshold, the limiter T causes the friction surface R between the first friction material 15 and the liner 14 to slide, and causes the friction surface R between the second friction material 19 and the liner 14 to slide, thereby limiting the increase of the load torque and eliminating the adverse situation of excessive load torque acting between the flywheel 1 and the travel transmission device TM.

[0048] [Contact part]

[0049] like Figures 1-4 As shown, the damper A with a torque limiter has multiple (four in this embodiment) contact portions C formed radially on the side plate P at positions offset from the limiter portion T towards the shaft core X. These contact portions C are arranged radially outward of the damper portion D, and are arranged in a manner that maintains equal intervals in the radial direction and is divided into multiple portions circumferentially, at positions overlapping with an imaginary line (not shown) extending radially from the shaft core X.

[0050] As a specific construction, the first side plate 11 has a first bulging wall 11c that bulges toward the second side plate 12. Similarly, the second side plate 12 has a second bulging wall 12c that bulges toward the first side plate 11. The first bulging wall 11c and the second bulging wall 12c constitute the contact portion C.

[0051] The contact portion C has multiple through holes 13 formed in the contact wall (an example of the opposing surface) at the bulging end of the first bulging wall 11c and the contact wall (an example of the opposing surface) at the bulging end of the second bulging wall 12c.

[0052] According to this structure, the damper A with torque limiter abuts the contact wall of the first bulge wall 11c against the contact wall of the second bulge wall 12c, and the first side plate 11 and the second side plate 12 are connected and fixed by any one or all of the rivets 6 inserted into the plurality of through holes 13. Thus, the distance (gap) between the pair of side plates P along the direction of the shaft X is maintained.

[0053] The hub 3 has a flange 4 that rotates integrally with the hub 3. For example... Figure 5 As shown, the contact portion C, formed by the first bulging wall 11c and the second bulging wall 12c, abuts against the limiting protrusion 4a formed on the flange body 4, and also functions as a limiter to restrict the displacement of the flange body 4. That is, the limiting protrusion 4a restricts the displacement of the flange body 4 by abutting against one or both of the first bulging wall 11c and the second bulging wall 12c.

[0054] [Damper Section]

[0055] like Figures 1-4 As shown, the multiple damper sections D are positioned closer to the shaft core X than the multiple contact sections C. That is, the multiple damper sections D and the multiple contact sections C, as described above, are arranged in a manner that divides the shaft core X into multiple sections along the circumference, and are positioned at a location that overlaps with an imaginary line extending radially (in this embodiment, they are positioned at a location that overlaps with an imaginary line extending radially).

[0056] The damper section D includes: a compression helical damping spring 21 (an example of a spring), a spring seat 22 supporting both ends of the damping spring 21, and a buffer material 23 housed in the helical portion of the damping spring 21.

[0057] In the following description, the damping spring 21, the pair of spring seats 22, and the cushioning material 23 are sometimes referred to as the damper unit DU. The cushioning material 23 is a soft and deformable cushioning material such as rubber or resin. The cushioning material 23 reduces the impact when the damper unit D operates by deforming when it approaches and is held by the pair of spring seats 22.

[0058] In addition, although the damper A with torque limiter has buffer material 23 in two of the multiple damping springs 21, it is also possible to have buffer material 23 in all or any number of damping springs 21.

[0059] Each of the first side plate 11 and the second side plate 12 has a damper opening PW at a position offset toward the shaft core X based on a plurality of (in this embodiment, four positions) contact portions C.

[0060] The hub 3 has a flange 4 that rotates integrally with the hub 3. The flange 4 has a damper engagement space 4W that cuts through the outer periphery, and a limiting protrusion 4a that protrudes radially outward from the damper engagement space 4W.

[0061] like Figure 4 , Figure 5 As shown, the damper section D embeds the damper unit DU into the multiple damper openings PW of the first side plate 11 and the second side plate 12, as well as the multiple damper engaging spaces 4W of the flange body 4.

[0062] The damper section D functions to apply the force of the damping spring 21 circumferentially between the flange 4, which rotates integrally with the hub 3, and a pair of side plates P, and to maintain the relative rotational posture of the flange 4 and the pair of side plates P centered on the shaft core X.

[0063] Therefore, when the load torque acting between the pair of side plates P and the hub 3 is low, the damper section D, through the force of the damping spring 21, maintains the relative rotational phase between the pair of side plates P and the flange body 4. Figure 4 The neutral phase is shown. In contrast, when the load torque exceeds a preset value, the damper section D, such as... Figure 5 As shown, by compressing the damping spring 21 and causing the flange body 4 centered on the shaft core X and the pair of side plates P to shift relative to each other, the increase in load torque is absorbed and the adverse situation of excessive load torque acting on the hub 3 from the pair of side plates P is eliminated.

[0064] Furthermore, under such conditions of increased load torque, as described above, the limit of the relative displacement between the pair of side plates P and the flange 4 is determined by bringing the limiting protrusion 4a of the flange body 4 into contact with the contact portion C.

[0065] In addition, when the damping spring 21 of the damper unit DU is compressed as the load torque increases, and a pair of side plates P and hub 3 are displaced, the pair of side plates P and flange 4 are relatively displaced in the hysteresis part H.

[0066] [Lagging section]

[0067] like Figures 1-4 As shown, the flange 4 is embedded in the gear-shaped fitting part on the outer periphery of the hub 3 and rotates integrally with the hub 3.

[0068] The hysteresis portion H includes a first cylindrical portion 25, a first friction ring 26, a second cylindrical portion 27, a second friction ring 28, and a ring spring 29.

[0069] The first cylindrical portion 25 is rotatably fitted onto the side of the hub 3 on which the first side plate 11 is disposed, and the inner periphery of the first side plate 11 contacts its outer periphery.

[0070] A first friction ring 26 is disposed between the flange body 4 and the first side plate 11. The first friction ring 26 causes a plurality of first engaging protrusions 26a on its outer surface to engage with the engaging portion of the first side plate 11, and causes the friction surface to contact the flange body 4.

[0071] The second cylindrical portion 27 is rotatably fitted onto the side of the hub 3 on which the second side plate 12 is disposed, and the inner periphery of the second side plate 12 contacts its outer periphery.

[0072] The second friction ring 28 is disposed between the flange body 4 and the second side plate 12. The second friction ring 28 causes the plurality of second engaging protrusions 28a on its outer surface to engage with the engaging portion of the second side plate 12, and causes the friction surface to contact the flange body 4.

[0073] The annular spring 29 is configured as a disc spring in the shape of an annular core X, and is positioned in a position held by the second side plate 12 and the second friction ring 28.

[0074] Thus, while the damper section D allows relative displacement of the pair of side plates P and the flange 4 in the rotational direction, the hysteresis section H maintains the condition that the frictional force acts on the flange 4 from the first friction ring 26 and the second friction ring 28, and allows relative rotation of the pair of side plates P and the flange 4.

[0075] The hysteresis unit H applies a moderate frictional force between the pair of side plates P and the flange 4 when the pair of side plates P and the flange 4 are displaced relative to each other in the rotational direction as the load torque increases. Furthermore, when the load torque decreases and the pair of side plates P and the flange 4 are restored to a neutral position by the damping spring 21 of the damper unit DU, a moderate frictional force is applied between the pair of side plates P and the flange 4.

[0076] [Load torque limiting action]

[0077] When the load torque is low, damper A with torque limiter restricts the sliding of liner 14 relative to the first friction material 15 and the second friction material 19 in limiter section T. Similarly, when the load torque is low, damper section D prevents relative displacement between a pair of side plates P and flange 4 by the force of four damping springs 21.

[0078] In contrast, the damper A with torque limiter limits the effect of excessive load torque on the travel transmission device TM and the engine by allowing sliding in the limiter section T and compression of the damping spring 21 in the damper section D, thereby causing relative displacement of a pair of side plates P and flange 4 centered on the shaft core X.

[0079] After the damper section D absorbs the load torque on the engine through the relative displacement of the pair of side plates P and flange 4 centered on the shaft X, as the load torque decreases, the relative phase of the pair of side plates P and flange 4 is restored by the force of the damping spring 21. Figure 4 The neutral phase is shown. In this case, the hysteresis H suppresses the rapid recovery by applying frictional force.

[0080] [Effects of the Implementation Method]

[0081] The damper A with torque limiter has a structure in which a limiter part T is disposed on the outer periphery of a pair of side plates P (first side plate 11, second side plate 12), and a damper part D is disposed on the side closer to the center of the side plate P than the limiter part T.

[0082] This structure, for example, eliminates the need for connecting components and frame-like processes compared to assembling the limiter and damper sections separately and integrating them into a damper with a torque limiter using connecting parts such as sheet metal or rods.

[0083] The damper A with torque limiter is fixed by rivets 6 in such a way that multiple contact parts C contact a pair of side plates P. Therefore, even under long-term use, the gap between the pair of side plates P is prevented from widening, and the gap between the pair of side plates P will not widen in the outer peripheral space S1.

[0084] The limiter section T, by placing the disc spring 18 between the first side plate 11 and the pressure plate 17, causes a force to be applied from the pressure plate 17 to the first friction material 15, so that the first friction material 15 contacts the liner 14 with a set contact pressure. Additionally, the limiter section T causes the second friction material 19 to contact the liner 14.

[0085] When the gap between the first side plate 11 and the second side plate 12 is widened, it is considered that this leads to an undesirable situation where the friction force of the friction force action surface R between the first friction material 15 and the second friction material 19, as well as the friction force of the friction force action surface R between them and the liner 14, is reduced.

[0086] In contrast, by connecting the first bulge wall 11c and the second bulge wall 12c of the multiple contact portions C with rivets 6, the widening of the gap between the pair of side plates P is restricted. Therefore, the reduction of friction in the limiter portion T is suppressed, and proper sliding will occur even under load torque exceeding a set value.

[0087] The damper A with torque limiter brings the abutting surface 14S of the connecting portion 14P of the liner 14 into contact with the connected surface of the flywheel 1, and they are connected by a plurality of connecting bolts 16, which is the proper assembly state. However, it is also possible that the flywheel 1 is assembled with the opposite side of the abutting surface 14S of the connecting portion 14P in contact with it.

[0088] To prevent such incorrect assembly, a raised front / back identification mark G is formed on the opposite side of the contact surface 14S through stamping of the connecting part 14P. This allows for proper judgment of the contact surface 14S of the connecting part 14P based on the tactile sensation caused by finger contact. Furthermore, in the case of incorrect assembly, since the raised portion of the front / back identification mark G contacts the connected surface of the flywheel 1, the connecting part 14P floats above the connected surface of the flywheel 1, enabling the identification of the error and the prevention of incorrect assembly.

[0089] For the damper section D, the force of the damping spring 21 always acts on the first side plate 11 and the second side plate 12, and it is believed that in the above-mentioned plates, deformation will occur near the damper opening PW.

[0090] In contrast, contact parts C are arranged near the four damper openings PW and fixed by rivets 6, so that deformation of the damper openings PW is suppressed.

[0091] In addition, the rivet 6 used for the contact part C can be inserted through multiple through holes 13. By selecting the through hole 13 through which the rivet 6 is inserted, the rotational balance of the damper A with torque limiter can also be improved.

[0092] [Another implementation method]

[0093] In addition to the embodiments described above, the present invention may also be configured as follows (components having the same functions as those in the embodiments are labeled with the same numbers and reference numerals as those in the embodiments).

[0094] (a) The front and back identification mark G is not limited to the case where a circular concave or convex shape is formed in the connecting portion 14P of the liner 14 as shown in the embodiment. For example, it can be formed in any shape such as an ellipse or a rectangle. In addition, the front and back identification mark G is not limited to a single one, but can also be formed in multiples.

[0095] (b) such as Figure 6 , Figure 7 As shown, the front and back identification mark G can also be formed by bending a portion of the outer periphery of the connecting part 14P toward the side opposite to the connected surface of the flywheel 1, and providing a cut. By forming the front and back identification mark G in this way, in the event of incorrect assembly, the protruding end of the front and back identification mark G abuts against the connected surface of the flywheel 1, thereby enabling early identification of errors.

[0096] (c) such as Figure 8 As shown, the first friction material 15 and the second friction material 19 are positioned at the location of the clamping liner 14, and the first friction material 15, the second friction material 19, and the liner 14 are connected by a fastening member 20 passing through them, thereby constituting the friction action mechanism F of the limiter section T. Figure 8 Although a single fastening component 20 is shown, in this friction action mechanism F, multiple fastening components 20 are used, arranged along the circumference of the liner 14 with the same or different pitches.

[0097] Although the friction mechanism F is composed of essentially the same components as the limiter part T described in the embodiment, the friction force application surface R that applies the friction force is different from that described in the embodiment. That is, it is composed of the contact surface between the first friction material 15 and the pressure plate 17, and the contact surface between the second friction material 19 and the second side plate 12.

[0098] In another embodiment (c), the limiter T, when the load torque exceeds the threshold, limits the increase of the load torque by sliding between the frictional force action surface R between the first frictional material 15 and the pressure plate 17 and the frictional force action surface R between the second frictional material 19 and the second side plate 12.

[0099] (d) Figure 9 , Figure 10 Although the friction mechanism F shown is the same as the other embodiment (a) described above, with the first friction material 15 and the second friction material 19 positioned at the clamping liner 14 and fixed thereon, the structure for fixing the first friction material 15 and the second friction material 19 to the liner 14 is different from that of the other embodiment (c).

[0100] In another embodiment (d), the limiter portion T is as follows: Figure 9 As shown, a plurality of fastening components 20 secure the first friction material 15 to the liner 14, and as shown in the figure. Figure 10 As shown, the multiple fastening components 20 that fasten the second friction material 19 to the liner 14 are different.

[0101] (e) Figure 11The friction mechanism F shown is the same as in the embodiment, and anti-rotation and radial positioning are achieved by engaging the protrusion 17T formed on the pressure plate 17 with the hole formed on the first friction material 15. In contrast, the second friction material 19 is fastened to the liner 14 by the fastening member 20.

[0102] According to this structure, the frictional force application surface R is composed of the contact surface between the first frictional material 15 and the liner 14, and the contact surface between the second frictional material 19 and the second side plate 12. Another embodiment (e) may also be configured to fasten the pressure plate 17 and the first frictional material 15 using rivets, screws, etc.

[0103] (f) Figure 12 The friction mechanism F shown is the same as in the embodiment. The second friction material 19 is anti-rotation and radially positioned by engaging with the protrusion 12T formed in the second side plate 12 and the hole formed in the second friction material 19. In contrast, the liner 14 and the second friction material 19 are connected by a fastening member 20 passing through them.

[0104] According to this structure, the frictional force application surface R is composed of the contact surface between the first frictional material 15 and the pressure plate 17, and the contact surface between the second frictional material 19 and the liner 14. Another embodiment (f) may also be configured to fasten the second frictional material 19 and the second side plate 12 using rivets, screws, etc.

[0105] (g) The driving transmission device TM is not limited to a gear-type transmission device, but may also include a device with a torque converter or a device with a belt CVT.

[0106] (h) In the limiter part T, the force-applying component that applies friction can be a leaf spring or a torsion spring.

[0107] (i) The number of contact portions C is not limited to four, but can be any number. That is, the contact portions C are configured to bulge out over the entire circumference (360-degree area) of a pair of side plates P (first side plate 11, second side plate 12). Alternatively, the number can be set to three or less or five or more.

[0108] (j) The spacing between the pair of side plates P (first side plate 11 and second side plate 12) is set to different values ​​on the outer side and the inner side of the contact portion C. By setting the spacing in this way, it is easy to obtain a spacing that corresponds to the size of the limiter portion T and the damper portion D.

[0109] Furthermore, the structures disclosed in the above embodiments (including another embodiment, the same below) can be combined with the structures disclosed in other embodiments as long as they do not create contradictions. In addition, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto. They can be appropriately modified without departing from the purpose of the present invention.

[0110] In the above embodiments, the following structure can be conceived.

[0111] (1) A damper A with a torque limiter, which limits the transmission of driving force from the internal combustion engine to the driving transmission device TM when the load torque acting from the internal combustion engine of the vehicle to the driving transmission device TM of the vehicle exceeds a threshold, comprising: a pair of side plates P, which are separately arranged in the direction along the shaft core X of the input shaft 2 of the driving transmission device TM; a friction-type limiter part T, which is housed in the space S1 between the pair of side plates P on the radially outer side of the pair of side plates P and slides when the load torque exceeds the threshold; and a damper part D, which is arranged in the pair of side plates P in a region closer to the shaft core X than the limiter part T, and absorbs the transmission of driving force by the elastic deformation of a spring (damping spring 21) as the load torque increases, and the pair of side plates P have a contact part C at the midpoint between the limiter part T and the damper part D in the radial direction, which allows the opposing surfaces to contact each other.

[0112] For example, it is also considered to assemble the limiter section and damper section separately, and to integrate them into a damper with a torque limiter using connecting components such as sheet metal or rods. However, it is believed that such a structure using connecting components would lead to an increase in the number of parts and an increase in assembly steps. In contrast, in this structure, the limiter section T is housed radially outside a pair of side plates P, and the damper section D is arranged radially inside the pair of side plates P, which eliminates the need for connecting components and connecting steps. In addition, by forming a contact portion C in the pair of side plates P at a radially midpoint between the limiter section T and the damper section D, which allows the opposing surfaces to contact each other, the undesirable situation of the spacing between the pair of side plates P becoming too narrow can be suppressed. In particular, in this structure, since the pair of side plates P has both the limiter section T and the damper section D, a dedicated structure for transmitting torque to the limiter section T and the damper section D is not required.

[0113] (2) In the damper A with torque limiter in (1), the opposing surfaces of the contact portion C at the middle position are preferably connected to each other by rivets 6.

[0114] According to this structure, the displacement of a pair of side plates P in the direction of separation is restricted by rivets 6, so even if a force is applied in the restrictor section T in the direction of widening the gap between the pair of side plates P, the gap between the pair of side plates P will not widen.

[0115] (3) In the damper A with torque limiter in (1) or (2), the limiter part T preferably has: an annular liner 14, which is fixed to the drive rotating body (flywheel 1) that transmits the driving force of the internal combustion engine and is rotatable about the shaft core X; friction materials 15, 19, which are disposed between each of a pair of side plates P and the liner 14 and are fixed to one of the side plates P or the liner 14; a force-applying member (disc spring 18), which makes the friction materials 15, 19 contact the other side plate P or the liner 14; and a pressure plate 17, which is disposed between the force-applying member (disc spring 18) and one of the friction materials 15.

[0116] According to this structure, by transmitting the force of the force-applying component (disc spring 18) from the pressure plate 17 to the friction material 15, the friction material 15 contacts the pressure plate 17 with a set contact pressure, and the required friction force is obtained. In addition, an outwardly open space S1 is formed at the radial outer periphery of the pair of side plates P, so that when assembling the damper A with torque limiter, the friction material 15, pressure plate 17 and force-applying component (disc spring 18) can be easily housed in the space S1, and the structural components of the limiter section T can also be easily maintained.

[0117] (4) In the damper A with torque limiter in (3), the liner 14 preferably has a plate-shaped connecting portion 14P on its outer periphery that is connected to the drive rotating body (flywheel 1), and a front and back identification mark G is formed on the connecting portion 14P to indicate the contact surface 14S when connected to the drive rotating body (flywheel 1).

[0118] According to this structure, when the connecting part 14P of the outer periphery of the liner 14 is connected and fixed to the drive rotating body (flywheel 1), the front and back of the connecting part 14P can be confirmed by visually observing the front and back identification mark G and touching it with a finger, thus eliminating the possibility of incorrect installation of the damper A with torque limiter relative to the drive rotating body (flywheel 1).

[0119] Industrial applications

[0120] This invention can be used in dampers with torque limiters.

[0121] Explanation of reference numerals in the attached figures

[0122] 1: Flywheel (driving rotating body), 2: Input shaft, 6: Rivet, 11: First side plate (side plate P), 12: Second side plate (side plate P), 14: Liner, 14P: Connecting part, 15: First friction material (friction material), 17: Pressure plate, 18: Disc spring (force application part), 19: Second friction material (friction material), 21: Damping spring (spring), A: Damper with torque limiter, C: Contact part, D: Damper part, G: Front and back identification mark, S1: Outer peripheral space (space), T: Limiter part, TM: Travel transmission device, X: Shaft core.

Claims

1. A damper with a torque limiter, which limits the transmission of driving force from the internal combustion engine to the vehicle's drive transmission device when the load torque acting from the vehicle's internal combustion engine on the vehicle's drive transmission device exceeds a threshold, comprising: A pair of side plates, which are separated and arranged in the direction of the shaft core along the input shaft of the aforementioned travel transmission device; A friction-type limiter portion, housed radially outside the pair of side plates in the space between the pair of side plates, slides when the load torque exceeds the threshold; and The damper section, located in a region of the pair of side plates closer to the shaft core than the limiter section, absorbs the transmission of driving force through the elastic deformation of the spring as the load torque increases. The pair of side plates have a contact portion at the midpoint between the limiter portion and the damper portion in the radial direction, which allows the opposing surfaces to contact each other.

2. The damper with torque limiter according to claim 1, wherein, The opposing surfaces at the intermediate position of the contact portion are connected to each other by rivets.

3. The damper with a torque limiter according to claim 1 or 2, wherein, The aforementioned limiter section has: The annular liner is connected and fixed to the drive rotating body that transmits the driving force of the internal combustion engine and is able to rotate around the shaft. Friction material, disposed between each of the pair of the aforementioned side plates and the aforementioned liner, and fixed to one of the aforementioned side plates or the aforementioned liner; A force-applying component that brings the aforementioned friction material into contact with another of the aforementioned side plates or the aforementioned liner plates; and A pressure plate is disposed between the aforementioned force-applying component and one of the aforementioned friction materials.

4. The damper with torque limiter according to claim 3, wherein, The aforementioned liner has a plate-shaped connecting portion on its outer periphery that connects to the aforementioned drive rotating body, and a front and back identification mark is formed on the connecting portion to indicate the contact surface when connected to the aforementioned drive rotating body.

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