JPH0685950U - Torsional vibration reduction device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain two types of friction damping force, large and small, according to the relative rotation angle of the input member and the output member with a simple structure. [Structure] An input member 11 and an output member 12 are elastically connected in a rotating direction via a torsion spring 3. A peripheral surface 16a facing the input member 11 and the output member 12,
20a is provided. The circumferential surface 16a of the input member 11 is provided with a circumferential groove 29 having tapered portions 31 at both ends.
The cylindrical roller 30 is housed in. Input member 11 and output member 1
When the relative rotation angle of 2 is less than or equal to the set angle θ, the cylindrical roller 30 generates rolling friction between the groove bottom surface 32 and the peripheral surface of the output member 12. When the relative rotation angle between the input member 11 and the output member 12 becomes larger than the set angle θ, the cylindrical roller 3
0 is restricted from rolling by the taper portion 31 and generates sliding friction with the peripheral surface of the output member 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a torsional vibration reduction device used in a power transmission section between an automobile engine and a transmission.

[0002]

[Prior art]

 A torsional vibration reducer used in a power transmission system of an automobile is constructed such that an input member connected to an engine side and an output member connected to a transmission side are assembled so as to be relatively rotatable by a predetermined angle, and both of them are connected to a torsion spring. It is elastically connected in the rotating direction by means of which the torsional vibration input from the engine side to the transmission side is reduced by the vibration absorbing action of the torsion spring. Recently, in order to more reliably reduce torsional vibration, a mechanism has been developed that is provided between the input member and the output member to generate a friction damping force in addition to the torsion spring. There is.

As this type of torsional vibration reducing device, conventionally, for example, devices as shown in FIGS. 5 and 6 have been devised.

In this torsional vibration reducing device, an output member 2 is arranged between a pair of drive plates 1 a and 1 b which are input members, and the drive springs 1 a and 1 b and the output member 2 are rotated by a torsion spring 3. And a plurality of elongated holes 4a, 4b are formed on the inner peripheral edge of the output member 2, and the spring member 5 and the spring member 5 are provided between the drive plates 1a, 1b in the elongated holes 4a, 4b. A friction material 7 accommodated together with the retainer plate 6 is loosely inserted. The friction material 7 is constantly in contact with the retainer plate 6 and one of the drive plates 1a in a state where a friction load is applied by the spring material 5, and when the drive plates 1a, 1b and the output member 2 rotate relative to each other, the friction material 7 The ends of the holes 4a and 4b come into contact with the friction material 7 to generate a friction damping force between the friction material 7 and the retainer plate 6 and the drive plate 1a. Further, the elongated holes 4a and 4b have different circumferential lengths, and when the relative rotation angle of the drive plates 1a and 1b and the output member 2 is equal to or less than the set angle θ, only one elongated hole 4a contacts the friction material 7. The two long holes 4a and 4b come into contact with the friction material 7 only when they come into contact with each other and become larger than the set angle θ. Therefore, in this torsional vibration reducing device, two types of friction damping force, large and small, are generated according to the relative rotation angle between the drive plates 1a and 1b and the output member 2. In the figure, 8 is a play element for operating a plurality of torsion springs 3 in series along the circumferential direction, 9 is a crankshaft to which the drive plates 1a and 1b are coupled, and 10 is an output member. 2 is a converter housing of the torque converter in which the two are connected.

This similar technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-163360.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional torsional vibration reduction device, in order to change the generated friction damping force according to the relative rotation angle of the drive plates 1a, 1b and the output member 2, the output member 2 has low friction and high friction. The two kinds of long holes 4a and 4b are formed respectively, and the friction material 7 of the number corresponding to these long holes 4a and 4b must be prepared, and in addition to the large number of processing steps and the number of parts, There is a problem that the assembly work becomes complicated.

Therefore, the present invention is intended to provide a torsional vibration reduction device that can reliably obtain two types of friction damping force, large and small, according to the relative rotation angle of the input member and the output member with a simple structure. is there.

[0008]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention elastically connects an input member and an output member in a rotating direction via a torsion spring, and at the same time, a peripheral surface facing the input member and the output member. A surface is provided, and a circumferential groove having stoppers at both ends is provided on one of the circumferential surfaces, and the groove bottom surface is provided in this circumferential groove when the relative rotation angle of the input member and the output member is less than or equal to the set angle. And rolling contact with the other peripheral surface, and when the relative rotation angle becomes larger than the set angle, rolling is regulated by the stopper portion to accommodate the rolling element slidingly contacting the other peripheral surface. did.

[0009]

[Action]

 When the relative rotation angle between the input member and the output member is less than or equal to the set angle, the rolling element makes rolling contact with the groove bottom surface of the circumferential groove and the other peripheral surface to generate rolling friction. Then, when the relative rotation angle becomes larger than the set angle, the rolling element makes sliding contact with the other peripheral surface to generate sliding friction.

[0010]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS. The same parts as those of the conventional one shown in FIGS. 5 and 6 are designated by the same reference numerals.

This embodiment shows an example in which the torsional vibration reducing device according to the present invention is used in the connecting portion between the crankshaft 9 of the engine and the converter housing 10 of the torque converter. An input member coupled to the shaft 9 side and an output member 12 coupled to the converter housing 10 side.

The input member 11 includes a pair of drive plates 1a and 1b coupled by a stop pin 13 at a predetermined interval, a reinforcement plate 14 coupled to the crankshaft 9 together with the drive plate 1a, and one drive plate 1a. The ring gear 15, the hold ring 16 and the hold plate 17 are integrally riveted to the outer peripheral edge of the.

On the other hand, the output member 12 has its inner peripheral end supported on the outer peripheral portion of the reinforcement plate 14 via a bearing 18, and its plate portion 19 is disposed between the pair of drive plates 1a and 1b. It is housed so that it can rotate relatively. A rim 20 is provided in the outer peripheral area of the plate portion 19, and an outer peripheral surface 20a of the rim 20 faces the inner peripheral surface 16a of the hold ring 16. It should be noted that the plate portion 19 is connected to the converter housing 10 at a plurality of locations from the outer periphery thereof by bolts 21 penetrating the drive plate 1b. The drive plates 1a and 1b have a length corresponding to the bolt 21. A plurality of holes 22 are formed so that the elongated holes 22 prevent the bolt 21 and the coupling projection 23 on the converter housing 10 side from coming into contact with the drive plates 1a and 1b. Furthermore, circumferentially long stopper holes 24 are formed at a plurality of positions from the outer periphery of the plate portion 19, and the stopper pins 13 are loosely inserted in the stopper holes 24. This stopper hole 24 regulates the relative rotation angle of the input member 11 and the output member 12. When the two members 11, 12 rotate relative to each other by a predetermined angle, the end of the stopper hole 24 is stopped by the stopper pin 13. It comes to abut. A plurality of windows 25 are formed in the plate portion 19 along the circumferential direction, and a pair of nested torsion springs 3, 3 are housed in each window 25 in a serial arrangement.

Further, between the drive plate 1b of the input member 1 and the plate portion 19 of the output member 12, an annular idler 26 is interposed so as to be rotatable relative to the two members 1b and 19. . The idler 26 is provided with a plurality of protrusions 27 protruding outward in the radial direction. The protrusions 27 are interposed between the torsion springs 3, 3 housed in the window 25, and the torsion springs 3 , 3 are operated in series along the circumferential direction. A washer 28 is interposed between the one drive plate 1a and the plate portion 19, the plate portion 19 and the idler 26, and between the idler 26 and the other drive plate 1b. The relative rotation can be done smoothly.

Further, a similar window 40 corresponding to the window 25 of the output member is formed in each of the drive plates 1 a and 1 b, and the torsion spring 3 housed in the window 25 is formed in each of the windows 40. , 3 are in contact with each other. Therefore, the input member 11 and the output member 12 are elastically connected in the rotating direction via the torsion springs 3 and 3.

Here, in this embodiment, the inner peripheral surface 16a of the holding ring 16 constitutes one peripheral surface of the present invention, and the outer peripheral surface 20a of the rim 20 opposes the other peripheral surface. Are configured. A plurality of circumferential grooves 29 are formed on the inner peripheral surface 16a of the hold ring 16, and each of the circumferential grooves 29 accommodates a cylindrical roller 30 as a rolling element. As shown in FIG. 3, the circumferential groove 29 is formed in a taper shape such that the range of the central angle θ is formed to have a constant depth, and the depth becomes gradually shallower in the range beyond that. The taper portion 31 constitutes a stopper portion that restricts the rolling of the cylindrical roller 30. On the other hand, the cylindrical roller 30 has a diameter equal to the distance from the groove bottom surface 32 of the general portion of the circumferential groove 29 to the outer peripheral surface 20a of the rim 20, and the relative rotation angle between the input member 11 and the output member 12 is the set angle. When the angle is θ or less, the groove bottom surface 32 and the outer peripheral surface 20a are brought into rolling contact with each other. Further, the cylindrical roller 30 has a predetermined elasticity, and the relative rotation angle between the input member 11 and the output member 12 becomes larger than the set angle θ, and the cylindrical roller 30 is provided between the tapered portion 31 and the outer peripheral surface 20a. When a predetermined amount of 30 is engaged, the cylindrical roller 30 stops rolling due to elastic deformation and comes into sliding contact with the outer peripheral surface 20a. Therefore, the cylindrical roller 30 generates a small friction damping force due to rolling friction when the relative rotation angle between the input member 11 and the output member 12 is equal to or less than the set angle θ, and when the relative rotation angle becomes larger than the set angle θ, Generates a large friction damping force due to sliding friction.

Since the torsional vibration reducing device has the above-described configuration, the drive torque of the engine is converted from the crankshaft 9 through the driveshafts 1a and 1b, the torsion springs 3 and 3, and the output member 12 in this order. Is transmitted to the converter housing 10.

The torsional vibration input from the crankshaft 9 to the drive shafts 1 a and 1 b is generated according to the vibration absorbing action of the torsion springs 3 and 3 and the relative rotation angle of the input member 11 and the output member 12. It is reduced by the friction damping force of two kinds of large and small by the cylindrical roller 30.

This torsional vibration reducing device has a very simple structure of accommodating a cylindrical roller 30 in rolling contact with the groove bottom surface 32 and the outer peripheral surface 20 a of the rim 20 in a circumferential groove 29 having tapered portions 31 at both ends. Due to the structure, two types of friction damping force are obtained according to the relative rotation angle between the input / output members 11 and 12, so the processing man-hours and the number of parts are ensured while having the same function as the conventional one. And the assembly can be done easily. Further, in the present embodiment, in addition to the advantage that the generated friction damping force can be easily changed only by replacing the cylindrical roller 30, the stopper portion for controlling the rolling of the cylindrical roller 30 is tapered. The configuration of the portion 31 has an advantage that noise such as tapping sound is not generated when the generated damping force is transferred. Further, in this embodiment, since the mechanism for generating the damping force is arranged at the radially outer position of the torsion spring 3 with a space, there is an advantage in designing and assembling parts. It has become.

FIG. 4 shows another embodiment of the present invention. The torsional vibration reducing device shown in FIG. 4 has a groove 33 having a constant depth formed on the inner peripheral surface of the hold ring 16 at both ends. A leaf spring 34 having a tapered portion 31 is accommodated, and the groove 33 and the leaf spring 34 form a circumferential groove 29. Incidentally, 35 is a locking piece which is integrally formed at both circumferential ends of the groove 33 and which also serves to lock the end of the leaf spring 34 and prevent the cylindrical roller 30 from popping out.

In this device, when the relative rotation angle between the input member 11 and the output member 12 becomes larger than the set angle θ, the taper portion 31 of the leaf spring 34 elastically moves the cylindrical roller 30 to the outer peripheral surface 20 a of the rim 20. Then, sliding friction is generated between the cylindrical roller 30 and the outer peripheral surface 20a. Therefore, also in this embodiment, it is possible to reliably obtain two types of friction damping forces, large and small, as in the case of the above-mentioned embodiment. Further, in the case of this device, since the friction damping force can be set by the spring rigidity of the leaf spring 34, the friction damping force can be set as compared with the above embodiment in which the elasticity of the cylindrical roller 30 sets the friction damping force. It has the advantage of being easy to adjust and change.

The embodiments of the present invention are not limited to those described above. For example, the circumferential groove may be formed on the peripheral surface of the output member side instead of the input member side, or as a rolling element. A ball may be used instead of the cylindrical roller, and the torsional vibration reducing device may be used in a flywheel portion of a power transmission system including a manual transmission.

[0023]

[Effect of device]

 As described above, according to the present invention, the input member and the output member are formed with the peripheral surfaces facing each other, and the rolling elements are housed in the circumferential grooves formed on either one of the peripheral surfaces. When the relative rotation angle of is less than or equal to the set angle, the rolling elements generate rolling friction between the groove bottom surface of the circumferential groove and the other circumferential surface, and the relative rotation angle becomes larger than the set angle. The rolling elements are restricted from rolling by the stopper part of the circumferential groove to generate sliding friction with the other circumferential surface, so the number of processing steps and the number of parts are small, and the assembly is easy and extremely easy. With such a structure, it is possible to reliably obtain two types of friction damping force, large and small, according to the relative rotation angle of the input member and the output member.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing the same embodiment.

FIG. 3 is an enlarged view of a main part of FIG. 1 showing the same embodiment.

FIG. 4 is a partially cutaway front view showing another embodiment of the present invention.

FIG. 5 is a partially cutaway front view showing a conventional technique.

FIG. 6 is a sectional view taken along line BB showing the same technique.

[Explanation of symbols]

 3 ... torsion spring, 11 ... input member, 12 ... output member, 16a ... inner peripheral surface (other peripheral surface), 20a ... outer peripheral surface (one peripheral surface), 29 ... circumferential groove, 30 ... cylindrical roller (rolling) Moving body 31 ... Tapered portion (stopper portion) 32 ... Groove bottom surface.

Claims (1)

[Scope of utility model registration request] 1. An input member and an output member are elastically connected in a rotational direction via a torsion spring, and peripheral surfaces facing each other are provided on the input member and the output member. A circumferential groove having stopper portions at both ends is provided on the surface, and the circumferential groove makes rolling contact with the groove bottom surface and the other circumferential surface when the relative rotation angle of the input member and the output member is equal to or less than the set angle, A torsional vibration reduction device, characterized in that when the relative rotation angle becomes larger than a set angle, the rolling element is accommodated in the stopper portion so that rolling is regulated and sliding contact with the other peripheral surface.