JP4327103B2 - Plate torsion spring - Google Patents

Description

  The present invention relates to a plate-shaped torsion spring, and is suitable for a plate-shaped torsion spring having a structure in which an inner input portion and an outer input portion are connected by a spring portion.

As such a plate-like torsion spring, in the plate-like torsion spring used for the clutch plate, the spring portion connecting the inner input portion and the outer input portion is a plate-like beam, that is, flattened as a whole, There is a technique that achieves the required spring elastic force and increases the transmission torque capacity even in a small space by elongating the planar shape of the beam as an S-shape or spiral shape (for example, Patent Document 1).
U.S. Pat. No. 2,410,014

However, if the elastic coefficient of the conventional plate-shaped torsion spring is to be reduced, the width of the beam (spring part) must inevitably be reduced, so that the fatigue strength is reduced and a large torque cannot be transmitted. .
The present invention has been made by paying attention to the above-described problems, and an object of the present invention is to provide a plate-shaped torsion spring that has excellent fatigue strength, can transmit a large torque, and has a small elastic coefficient. is there.

  In order to solve the above problems, a plate-shaped torsion spring according to claim 1 of the present invention comprises an inner input portion and an outer input portion, and a spring portion that connects the inner input portion and the outer input portion. The spring portion is elastically deformed by a torque acting on the inner input portion or the outer input portion, and the inner input portion and the outer input portion are rotated relative to each other about the rotation axis by the elastic deformation. In the plate-shaped torsion spring to be connected, the spring portion is formed so as to protrude in the rotation axis direction with respect to the inner input portion or the outer input portion.

  Thus, according to the plate-shaped torsion spring according to claim 1 of the present invention, the inner input portion and the outer input portion, and the spring portion that connects the inner input portion and the outer input portion, The spring portion is elastically deformed by a torque acting on the inner input portion or the outer input portion, and the inner input portion and the outer input portion are connected to each other so as to rotate relative to each other about the rotation axis by the elastic deformation. In the plate-shaped torsion spring, the spring portion is formed so as to protrude in the rotational axis direction with respect to the inner input portion or the outer input portion. Therefore, by ensuring the length of the spring portion, fatigue strength and The elastic modulus can be reduced without reducing the transmission torque capacity.

Next, a first embodiment of the plate-like torsion spring of the present invention will be described with reference to the drawings.
FIG. 1 shows the use of a plate-shaped torsion spring of this embodiment as a lock-up damper 2 of a torque converter 1 with a lock-up clutch. Reference numeral 21 in FIG. 1 denotes an impeller that constitutes the torque converter 1, reference numeral 22 in the figure denotes a turbine that also constitutes the torque converter 1, and reference numeral 23 in the figure denotes a stator that also constitutes the torque converter 1. The impeller 21 is connected to the engine via a torque converter cover 24, and the turbine 22 is connected to an input shaft 25 of the transmission. The stator 23 is connected to a fixed wall via a one-way clutch. Of course, the working fluid is sealed in the torque converter cover 24. Therefore, in this torque converter, the rotation from the engine is transmitted to the turbine 22 and the stator 23 via the drive plate set screw 20, the torque converter cover 24, the impeller 21 and the fluid, and the rotational torque increased by the turbine 22 is transmitted to the turbine shell. 26, and transmitted to the input shaft 25 via the turbine hub 27.

  On the other hand, the lock-up clutch includes a lock-up piston plate 29 extending in the radial direction from the turbine hub 27 and a facing 30 attached to the outer side in the radial direction. Therefore, when the working fluid pressure between the torque converter cover 24 and the lock-up piston plate 29 is reduced, the facing 30 is strongly pressed against the torque converter cover 24, and the lock-up piston plate 29 and the torque converter cover 24 are directly connected. Become. As a result, the engine torque is transmitted from the torque converter cover 24 to the outer peripheral holder 31, and is transmitted from the outer peripheral holder 31 through the lockup damper 2 in the order of the hub 33, the turbine shell 26, the turbine hub 27, and the input shaft 25. . That is, in this state, since the torque converter 1 is not intervening in the engine torque transmission path, it can be said that the engine and the transmission are in a directly connected state.

  The lock-up damper 2 includes two low-rigid springs 3 that are adjacent to each other and have a small elastic coefficient (elastic force) with respect to the input torque (engine torque), and an elastic coefficient (with respect to the input torque (engine torque)). A single high-rigid spring 4 having a large elastic force is combined in parallel. The low rigidity spring 3 is fixed to the outer peripheral holder 31 and the inner peripheral holder 32, the outer peripheral holder 31 is connected to the lockup piston plate 29, and the inner peripheral holder 32 is connected to the hub 33. Further, the high rigidity spring 4 is disposed between the outer peripheral holder 31 and the hub 33. The lockup damper 2 transmits engine torque from the hub 33 to the input shaft 25 while the low-rigidity spring 3 having a small elastic coefficient is deformed when the engine torque is smaller than a predetermined value, and has low rigidity when the engine torque is equal to or larger than the predetermined value. The engine torque is transmitted from the hub 33 to the input shaft 25 while the spring 3 and the highly rigid spring 4 having a large elastic coefficient work together.

  FIG. 2 shows an example of the low rigidity spring 3. In the figure, an outer peripheral holder 31 and an inner peripheral holder 32 are shown together. The low-rigidity spring 3 is a spiral spring as illustrated. The inner peripheral holder 32 is fixed to the inner peripheral end of the low-rigidity spring 3 made of a spiral spring, and is attached to the hub 33 so as to be movable in the rotational axis direction of the input shaft 25 by spline coupling (not shown). Connected. The outer peripheral holder 31 is fixed to the outer peripheral end of the low-rigidity spring 3 made of a spiral spring and protrudes toward the high-rigidity spring 4. Therefore, when engine torque smaller than a predetermined value is input from the torque converter cover 24 when the lockup clutch is engaged, the low-rigidity spring 3 is elastically deformed, and the amount of elastic deformation, that is, the state where the elastic force and the engine torque are balanced. Thus, the engine torque is transmitted from the outer peripheral holder 31 in the order of the low rigidity spring 3, the inner peripheral holder 32, the hub 33, and the input shaft 25.

  FIG. 3 shows the high-rigidity spring 4 of the present embodiment. In the figure, the outer peripheral holder 31 fixed to the low-rigidity spring 3 is also indicated by a two-dot chain line. From the high-rigidity spring 4, an engaging convex portion 19 protrudes radially outward from the ring-shaped outer input portion 6. Accordingly, when the low-rigidity spring 3 composed of the spiral spring is deformed in the circumferential direction as described above, the outer circumference holder 31 moves along the outer circumference of the outer input portion 6 of the high-rigidity spring 4, and the engine torque exceeds the predetermined value. As a result, the outer peripheral holder 31 comes into contact with the engaging convex portion 19. Thus, after the outer periphery holder 31 abuts on the engaging convex portion 19, the high rigidity spring 4 and the low rigidity spring 3 cooperate with the engine torque, and the engine torque is transferred from the hub 33 to the input shaft. 25. Incidentally, the high-rigidity spring 4 also has a function of preventing the low-rigidity spring 3 from buckling toward the turbine 22 side.

  On the other hand, as described above, the ring-shaped inner input portion 5 of the high-rigidity spring 4 is connected to the portion 33. These inner input part 5 and outer input part 6 are flat and flat as shown in FIG. 3a. And these inner side input part 5 and the outer side input part 6 are connected with the spring part 7 at four places, ie, every 90 degrees, at equal intervals in the circumferential direction. Each of the spring portions 7 is obtained by bending a plate member provided extending in the radial direction of the inner input portion 5 (or the outer input portion 6) into a wave shape. As shown in FIGS. And the bent portion 13. That is, in the bent portion 13 between the inner input portion 5 and the outer input portion 6, the flat portion 12 protrudes substantially in the rotational axis direction of the input shaft 25 with respect to the inner input portion 5 and the outer input portion 6. The plate member is bent, and the spring portion 7 is formed into a wave shape by the flat portion 12 and the bent portion 13. In the present embodiment, the bent ridge line 8 extends in the circumferential direction of the inner input portion 5 (or the outer input portion 6). Further, as described above, the flat surface portion 12 of the spring portion 7 protrudes only to the left in FIG. 3A, that is, the rotation axis direction of the input shaft 25, in other words, the rotation direction of the inner input portion 5 or the outer input portion. ing. Here, the wave shape means that the spring portion 7 protrudes in the rotation axis direction of the input shaft 25 as described above, and does not define the number and shape of the plane portion 12 and the bent portion 13. . As shown in FIG. 1, the spring portion 7 protrudes toward the turbine 22 side of the torque converter 1 and is provided on the outer peripheral side from the top of the curved portion having a substantially semicircular cross section of the turbine 22. Incidentally, the high-rigidity spring 4 made of this plate-shaped torsion spring is obtained by press-molding the spring portion 7 after press-punching a thin steel plate to form an overall shape.

  For example, assuming that the state of the spring portion 7 when the engine torque is not acting is as shown in FIG. 4 a, when the engine torque acts on the outer input portion 6, the outer input portion 6 rotates relative to the inner input portion 5. try to. At this time, the spring portion 7 is elastically deformed as shown in FIG. As a result, as shown in FIGS. 5a and 5b, for example, the spring portion 7 is connected so that the inner input portion 5 and the outer input portion 6 rotate relative to each other. The elastic coefficient of this displacement amount is nothing but the elastic coefficient of the spring portion 7.

  Here, assuming that the plate thickness is t and the width of the spring portion 7 is w, the cross-sectional secondary moment I when the spring portion 7 is bent is I = tw3 / 12, so the width of the spring portion 7 cannot be reduced. Thus, it can be seen that the rigidity is large. However, in general, it is difficult to machine a width smaller than the plate thickness by press punching. Therefore, considering the thickness t and width w of the spring portion 7 formed by press punching, the width of the spring portion 7 is considered. w is larger than the thickness t. Therefore, in the plate-shaped torsion spring formed by press working, there is a limit in reducing the elastic coefficient by reducing the width of the spring portion 7. Of course, when the width of the spring portion 7 is narrowed, the fatigue strength is also reduced and the transmittable torque is also reduced.

  Therefore, in the present embodiment, the spring member 7 is formed by bending the plate member so as to protrude in the rotation axis direction of the input shaft 25, that is, in the rotation axis direction of the inner input portion 5 or the outer input portion 6. By connecting the inner input portion 5 and the outer input portion 6 with each other, when a torque acts on the inner input portion 5 or the outer input portion 6, the spring portion 7 is elastically deformed to allow displacement of both.

Therefore, according to this lockup damper 2, for example, when the engine torque of the predetermined value or more is applied when the accelerator pedal is depressed, the low rigidity spring 3 and the high rigidity spring 4 work together, and the elasticity of the low rigidity spring 3 is increased. The engine torque is transmitted from the hub 33 to the input shaft 25 while the engine torque is attenuated by the force and the elastic force of the high rigidity spring 4. At this time, the high-rigidity spring 4 according to the present embodiment includes an inner input portion 5 and an outer input portion 6 and a spring portion 7 that connects the inner input portion 5 and the outer input portion 6. Is elastically deformed by a torque acting on the inner input portion 5 or the outer input portion 6, and the inner input portion 5 and the outer input portion 6 are rotated relative to each other about the rotation axis by the elastic deformation. It is a plate-shaped torsion spring to be connected, and the spring portion 7 is formed by bending a plate member into a wave shape so as to protrude in the rotational axis direction with respect to the inner input portion 5 or the outer input portion 6. because you a plate-like torsion spring, by securing the length of the spring portion 7, without reducing the fatigue strength and torque transfer capacity, Ru can be reduced elastic modulus.

Further, the inner input portion 5 is formed in a ring shape, and the bent ridge line 8 of the spring portion 7 is formed so as to extend in the circumferential direction of the inner input portion 5, that is, in the rotation direction of the inner input portion 5 or the outer input portion 6. flexes as 7 flat portion 12 between the ridge 8 bending twists by elastic deformation, without reducing the fatigue strength and torque transfer capacity, Ru can be reduced elastic modulus.

Further, the impeller 21 to which torque from the engine (drive source) is transmitted, the turbine 22 that transmits torque transmitted from the impeller 21 through the fluid to the transmission, and the impeller 21 by the movement of the lockup piston plate 29. And a turbine 22 and a torque converter 1 having a lock-up clutch that can rotate integrally with the turbine 22, and a high-rigid spring 4 made of a plate-shaped torsion spring is connected to the lock-up piston plate 29 in a directly-connected state by the lock-up clutch. This is applied to the lockup damper 2 for transmitting torque between the turbine 22 and the turbine 22 and is formed by bending the plate member into a wave shape so that the spring portion 7 of the high rigidity spring 4 made of a plate-like torsion spring protrudes toward the turbine 22 side. As a result, the torque between the turbine 22 and the lockup damper 2 is effectively utilized. It is possible to shorten the converter 1 the axial length of itself and that Do.

  Next, 2nd Embodiment of the plate-shaped torsion spring of this invention is described using FIG. 6, FIG. The plate-like torsion spring of this embodiment is also used as the high-rigidity spring 4 of the lock-up damper 2 of the torque converter 1 as in the first embodiment. Also in this embodiment, the ring-shaped inner input portion 5 and the ring-shaped outer input portion 6 disposed on the outer side thereof are connected by a spring portion 7, and as shown in FIGS. 6a and 6b, this spring portion. Reference numeral 7 denotes a plate member that extends in the circumferential direction of the inner input portion 5 (or the outer input portion 6) and is bent into a wave shape. Similarly to the first embodiment, the flat portion 12 and the bent portion are bent. 13, and the flat portion 12 and the bent portion 13 are formed into a wavy shape. In the present embodiment, the arcuate spring portion 7 formed by bending the plate member into a wave shape so that the bent ridge line 8 extends in the radial direction of the ring-shaped inner input portion 5 (or the outer input portion 6) is used as the inner input. The inner input portion 5 and the spring portion 7 or the outer input portion 6 and the spring portion 7 are connected to each other at two positions which are disposed between the portion 5 and the outer input portion 6 and are shifted by 90 degrees (phase). Incidentally, the high-rigidity spring 4 comprising the plate-shaped torsion spring of this embodiment is also formed by press-molding the spring portion 7 after press-punching a thin steel plate to form the entire shape, as in the first embodiment. It is.

  For example, assuming that the state of the spring portion 7 when the engine torque is not acting is as shown in FIGS. 6 a and 6 b, when the engine torque acts on the outer input portion 6, the outer input portion 6 is in relation to the inner input portion 5. Try to rotate relative. At this time, the spring portion 7 is elastically deformed to allow displacement of both. As a result, as shown in FIGS. 7a and 7b, for example, the spring portion 7 is connected so that the inner input portion 5 and the outer input portion 6 rotate relative to each other.

As described above, the highly rigid spring 4 of the present embodiment includes the inner input portion 5 and the outer input portion 6 and the spring portion 7 that connects the inner input portion 5 and the outer input portion 6, and the spring portion. 7 is elastically deformed by a torque acting on the inner input portion 5 or the outer input portion 6, and the inner input portion 5 and the outer input portion 6 are rotated relative to each other about the rotation axis by the elastic deformation. The spring portion 7 is formed by bending a plate member into a wave shape so as to protrude in the rotational axis direction with respect to the inner input portion 5 or the outer input portion 6. was due configured in plate shape torsion spring, by securing the length of the spring portion 7, without reducing the fatigue strength and torque transfer capacity, Ru can be reduced elastic modulus.

Further, the inner input portion 5 is formed in a ring shape, and the bent ridge line 8 of the spring portion 7 is formed so as to extend in the radial direction of the inner input portion 5, that is, in the normal direction with respect to the rotation direction of the inner input portion 5 or the outer input portion 6. by the, is easy to increase the length of the spring portion 7, without reducing the fatigue strength and torque transfer capacity, Ru can be reduced elastic modulus.

Further, the impeller 21 to which torque from the engine (drive source) is transmitted, the turbine 22 that transmits torque transmitted from the impeller 21 through the fluid to the transmission, and the impeller 21 by the movement of the lockup piston plate 29. And a turbine 22 and a torque converter 1 having a lock-up clutch that can rotate integrally with the turbine 22, and a high-rigid spring 4 made of a plate-shaped torsion spring is connected to the lock-up piston plate 29 in a directly-connected state by the lock-up clutch. This is applied to the lockup damper 2 for transmitting torque between the turbine 22 and the turbine 22 and is formed by bending the plate member into a wave shape so that the spring portion 7 of the high rigidity spring 4 made of a plate-like torsion spring protrudes toward the turbine 22 side. As a result, the torque between the turbine 22 and the lockup damper 2 is effectively utilized. It is possible to shorten the converter 1 the axial length of itself and that Do.

  Next, 3rd Embodiment of the plate-shaped torsion spring of this invention is described using FIG. 8, FIG. The plate-like torsion spring of this embodiment is also used as the high-rigidity spring 4 of the lock-up damper 2 of the torque converter 1 as in the first embodiment. Also in this embodiment, the ring-shaped inner input portion 5 and the ring-shaped outer input portion 6 disposed outside the ring-shaped inner input portion 6 are connected by the spring portion 7, but both of them are clearly shown in FIGS. 8a and 8b. The four connecting portions are shifted in the circumferential direction and connected between them by the spring portion 7, and the bent ridgeline 8 of the spring portion 7 is connected to the ring-shaped inner input portion 5 (as in the second embodiment). Alternatively, the plate member is formed in a wave shape so as to extend in the radial direction of the outer input portion 6). As a result, an inner input portion side stopper 9 is formed between the inner input portion 5 and the spring portion 7, and an outer input portion side stopper 10 is formed between the outer input portion 6 and the spring portion 7. It was to be done. Incidentally, the high-rigidity spring 4 comprising the plate-shaped torsion spring of this embodiment is also formed by press-molding the spring portion 7 after press-punching a thin steel plate to form the entire shape, as in the first embodiment. It is.

  For example, assuming that the state of the spring portion 7 when the engine torque is not acting is as shown in FIGS. 8 a and 8 b, when the engine torque acts on the outer input portion 6, the outer input portion 6 is in relation to the inner input portion 5. Try to rotate relative. At this time, the spring portion 7 is elastically deformed to allow displacement of both. As a result, as shown in FIGS. 9a and 9b, for example, the spring portion 7 is connected so that the inner input portion 5 and the outer input portion 6 rotate relative to each other. However, in this embodiment, as shown in FIG. 9a, the inner input unit 5 rotates relative to the outer input unit 6 in the clockwise direction, and the adjacent inner input unit side stopper 9 and outer input unit side stopper 10 If they come into contact with each other, no further relative rotation is allowed. For example, if the engine torque at which the inner input portion side stopper 9 and the outer input portion side stopper 10 are in contact with each other is set to a second predetermined value, the inner input portion 5 can be used for an engine torque greater than the second predetermined value. Since the relative rotation between the outer input portion 6 and the outer input portion 6 is not allowed, the lockup damper 2 does not act and the engine torque is directly transmitted to the input shaft 25. Can be protected. On the other hand, when the inner input unit 5 rotates relative to the outer input unit 6 counterclockwise as shown in FIG. In addition, when the protective action of the lockup damper 2 by the inner input portion side stopper 9 and the outer input portion side stopper 10 functions only in the relative rotation of either the inner input portion 5 or the outer input portion 6 in this way. For example, a stopper may be provided in a direction in which a larger torque acts, for example, on the drive (drive) side.

Thus, according to the plate-shaped torsion spring of this embodiment, in addition to the operation and effect of the second embodiment, the inner input portion side stopper 9 is provided between the spring portion 7 and the inner input portion 5. The outer input portion side stopper 10 is provided between the spring portion 7 and the outer input portion 6, and a torque greater than or equal to a second predetermined value is applied to the inner input portion 5 or the outer input portion 6 in one of the rotational directions. When the inner input portion side stopper 9 and the outer input portion side stopper 10 come into contact with each other, the inner input portion side stopper 9 and the outer input portion side stopper 10 are interposed between the inner input portion 5 and the outer input portion 6. by directly transmit torque, such as during depression of the accelerator pedal, Ru can protect the plate-shaped torsion spring itself to any excessive torque in the one direction.

  Next, 4th Embodiment of the plate-shaped torsion spring of this invention is described using FIG. The plate-like torsion spring of this embodiment is also used as the high-rigidity spring 4 of the lock-up damper 2 of the torque converter 1 as in the first embodiment. In this embodiment, the high-rigidity spring 4 including the plate-shaped torsion spring of the third embodiment is changed to increase the transmission torque. Specifically, the inner input portion 5 and the outer input by the spring portion 7 are changed. The connection part of the part 6 is expanded to 16 places. For example, the direction and the inner input portion side stopper 9 and the outer input portion side stopper 10 of the bent ridge line 8 of the spring portion 7 have the same configuration and action. That is, in this embodiment, the connection part of the inner side input part 5 and the outer side input part 6 by the spring part 7 is expanded to 16 places, that is, the inner side through the inner side input part side stopper 9 and the outer side input part side stopper 10. By increasing the number of direct torque transmission locations of the input portion 5 and the outer input portion 6 to 16 locations, the area of the contact surface of the inner input portion side stopper 9 and the outer input portion side stopper 10 is increased, and the inner input portion is increased. It is possible to increase the transmission torque after the part-side stopper 9 and the outer input part-side stopper 10 abut. Incidentally, the high-rigidity spring 4 comprising the plate-shaped torsion spring of this embodiment is also formed by press-molding the spring portion 7 after press-punching a thin steel plate to form the entire shape, as in the first embodiment. It is.

  Next, 5th Embodiment of the plate-shaped torsion spring of this invention is described using FIG. The plate-like torsion spring of this embodiment is also used as the high-rigidity spring 4 of the lock-up damper 2 of the torque converter 1 as in the first embodiment. In this embodiment, the high-rigidity spring 4 including the plate-shaped torsion spring of the fourth embodiment is changed to increase the transmission torque in both directions. Specifically, the spring portion 7 of the second embodiment is used. The inner input unit 5 and the outer input unit 6 are connected to six connecting points, and the inner input unit side stopper 9 is provided between the inner input unit 5 and the spring unit 7 on the left and right sides of the uppermost part and the lowermost part of the figure. The stopper part 11 is projected from the uppermost part and the lowermost part of the outer input part 6 toward the inner input part 5, and the outer input part side stoppers 10 are formed on both left and right sides of the outer input part 6. As a result, when the inner input unit 5 and the outer input unit 6 rotate relative to each other, the outer input unit side stopper 10 and the inner input unit side stopper 9 come into contact with each other regardless of the direction of rotation. The damper can be protected from excessive torque, and the transmission torque after the inner input portion side stopper 9 and the outer input portion side stopper 10 abut can be increased in both directions. Incidentally, the high-rigidity spring 4 comprising the plate-shaped torsion spring of this embodiment is also formed by press-molding the spring portion 7 after press-punching a thin steel plate to form the entire shape, as in the first embodiment. It is. In addition to the above, the combination of the inner input portion side stopper 9 and the outer input portion side stopper 10 is provided with an outer input portion side stopper 10 between the outer input portion 6 and the spring portion 7, and the inner input portion 5. There is also a combination in which the stopper portion 11 is protruded and the inner input portion side stopper 9 is provided on both sides thereof.

Therefore, according to the plate-shaped torsion spring of the present embodiment, in addition to the operation and effect of the third embodiment, an inner input portion side stopper 9 provided between the spring portion 7 and the inner input portion 5; A combination with the outer input portion side stopper 10 provided in the outer input portion 6 or an inner input portion side stopper 9 provided in the inner input portion 5 and provided between the spring portion 7 and the outer input portion 6. Any one of the combinations with the outer input unit side stopper 10, and when the torque greater than or equal to the second predetermined value is applied to the inner input unit 5 or the outer input unit 6 in both rotation directions, the inner input unit side stopper 9 and Since the torque is transmitted between the inner input portion 5 and the outer input portion 6 via the outer input portion side stopper 10, the plate-shaped torsion spring itself can be protected against excessive torque in both directions. The

  In each embodiment of the present application, the plate-shaped torsion spring of the present invention has been described in detail only when it is used as a high-rigidity spring of the lock-up damper of the torque converter. However, the use of the plate-shaped torsion spring of the present invention is limited to this. For example, the present invention can be applied to a torsion spring of any application including a low rigidity spring of the lock-up damper and a torsion spring attached to an engine flywheel.

Moreover, in each embodiment of this application, although the said spring part 7 is provided with the plane part 12, it does not necessarily need to be provided with the part of a plane.
Further, in each embodiment of the present application, the protrusion in the rotation axis direction of the input shaft 25, that is, the rotation axis direction of the inner input portion 5 or the outer input portion 6 means that the inner input portion 5 and the outer input portion 6 are on the same plane. Is in the out-of-plane direction with respect to the plane, and when the inner input portion 5 and the outer input portion 6 are not on the same plane, that is, the plate-shaped torsion spring according to the present invention. When the outer shape can be roughly regarded as a truncated cone by the inner input portion 5 and the outer input portion 6, it means that the outer shape protrudes from the peripheral wall surface of the truncated cone. For example, as in the embodiments of the present application, in the case where the spring portion 7 of the plate-shaped torsion spring is press-molded, the protrusion in the rotation axis direction of the inner input portion 5 or the outer input portion 6 means the inner input portion 5 or the outer portion. It does not mean that the input portion 6 is press-formed in the direction of the rotation axis, and the shape of the spring portion 7 after press molding is the inner input portion 5 or the outer input portion as compared to the shape of the spring portion 7 before press forming. 6 can be said to have a portion protruding in the direction of the rotational axis.
Needless to say, forming the spring portion 7 into a wavy shape is not limited to press molding.

It is sectional drawing of the lockup damper of the torque converter using the plate-shaped torsion spring of this invention. It is a top view which shows an example of the low-rigidity spring used for the lockup damper of FIG. 1A and 1B show a first embodiment of a plate-shaped torsion spring of the present invention used as a high-rigidity spring of the lock-up damper of FIG. 1, wherein FIG. It is explanatory drawing of an effect | action of the spring part of FIG. It is explanatory drawing of an effect | action of the plate-shaped torsion spring of FIG. 2A and 2B show a second embodiment of the plate-shaped torsion spring of the present invention used as a high-rigidity spring of the lock-up damper of FIG. 1, wherein FIG. 1A is a plan view, and FIG. FIG. It is explanatory drawing of an effect | action of the plate-shaped torsion spring of FIG. FIG. 4 shows a third embodiment of the plate-shaped torsion spring of the present invention used as a high-rigidity spring of the lock-up damper of FIG. 1, (a) is a plan view, and (b) is a view of arrow A in (a). FIG. It is explanatory drawing of an effect | action of the plate-shaped torsion spring of FIG. It is a top view which shows 4th Embodiment of the plate-shaped torsion spring of this invention used as a highly rigid spring of the lockup damper of FIG. It is a top view which shows 5th Embodiment of the plate-shaped torsion spring of this invention used as a highly rigid spring of the lockup damper of FIG.

Explanation of symbols

1 is a torque converter 2 is a lock-up damper 3 is a low rigidity spring 4 is a high rigidity spring 5 is an inner input section 6 is an outer input section 7 is a spring section 8 is a bent ridge 9 9 is an inner input section side stopper 10 is an outer input section side The stopper 11 is a stopper portion 12 is a flat surface portion 13 is a bent portion.

Claims (5)

An inner input portion and an outer input portion, and a spring portion connecting the inner input portion and the outer input portion, and the spring portion is elastically deformed by a torque acting on the inner input portion or the outer input portion. In addition, in the plate-shaped torsion spring in which the inner input portion and the outer input portion are connected to each other so as to rotate relative to each other about the rotation axis by the elastic deformation, the spring portion is connected to the inner input portion or the outer input portion. On the other hand, the impeller is formed so as to protrude in the direction of the rotation axis, and is opposed to the impeller between the torque converter cover and the impeller, and an impeller through which torque from a drive source is transmitted via the torque converter cover A turbine that transmits torque transmitted from the impeller via a fluid to the transmission, and between the torque converter cover and the turbine. Vignetting and includes a torque converter having a lockup clutch which integrally rotatable as a directly connected state and the said impeller turbine by the movement of the lock-up piston, the low-rigidity to said lock-up piston side of the plate-shaped torsion spring A spring is disposed, and the plate-like torsion spring is applied to a lock-up damper that transmits torque between the lock-up piston and the turbine in the directly connected state, and the spring portion protrudes only to the turbine side. A plate-shaped torsion spring characterized by being formed in the above.   The plate-shaped torsion spring according to claim 1, wherein the bent ridge line of the spring portion is formed to extend in the rotation direction of the inner input portion and the outer input portion.   The plate-shaped torsion spring according to claim 1, wherein the bent ridge line of the spring portion extends in a normal direction with respect to the rotation direction of the inner input portion and the outer input portion.   An inner input portion side stopper provided between the spring portion and the inner input portion; and an outer input portion side stopper provided between the spring portion and the outer input portion; Alternatively, when a torque of a predetermined value or more acts on one of the rotation directions on the outer input unit, the inner input unit side stopper and the outer input unit side stopper come into contact with each other, so that the inner input unit and the outer input unit are in contact with each other. The plate-shaped torsion spring according to claim 1 or 3, wherein torque is transmitted between the input portion and the input portion.   A combination of an inner input portion side stopper provided between the spring portion and the inner input portion and an outer input portion side stopper provided in the outer input portion, or an inner input provided in the inner input portion Any one of a combination of a part side stopper and an outer input part side stopper provided between the spring part and the outer input part, and the inner input part or the outer input part has a predetermined value in both rotational directions. When the above torque is applied, the torque is transmitted between the inner input portion and the outer input portion by contacting the inner input portion side stopper and the outer input portion side stopper. The plate-shaped torsion spring according to claim 1 or 3.

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