Damper apparatus

Abstract

In a damper apparatus comprises springs, a holder for holding the springs, and a plate having pawls engaged by the springs, splines are provided on an inner peripheral portion and an outer peripheral portion of the damper apparatus.

Description

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a damper apparatus which is used in a torque converter or a starting clutch used with an automatic transmission of a vehicle and the like and which is used in a power transmitting mechanism at an output side of an engine.

[0004] 2. Related Background Art

[0005] FIGS. 3 and 4 show an example of a conventional damper apparatus. This apparatus will be explained hereinbelow. FIG. 3 is a front view of the conventional damper apparatus, and FIG. 4 is a sectional view taken along the line 4-4 in FIG. 3.

[0006] A damper apparatus 51 comprises a retainer plates 71, 72 having peripheral portions interconnected by rivets 73, a plurality of sets of small and large spring 81, 82 (one small spring 81 and one large spring 82 constitute one set) disposed at predetermined position within an annular cavity defined by the retainer plates 71, 72 piece members 65 each of which is disposed between adjacent sets of springs 81, 82 and is movable in the cavity defined by the retainer plates 71, 72 and a plate 61 having pawls 63 elastically engaged by the springs 81, 82. Further, the retainer plate 81 is provided with bent portions 75 for regulating movements of the springs 81, 82.

[0007] The damper apparatus 51 is assembled in such a manner that the damper apparatus is attached to one of opponent members by the rivets 73 inserted into holes 74 provided in the retainer plates 71, 72 and is attached to the other of the opponent members by splines formed on an inner periphery of the plate 61.

[0008] However, since the above-mentioned damper apparatus 51 is attached to the opponent member by the rivets 73, as shown in FIG. 4, it is necessary that outer peripheral edge portions of the retainer plates 71, 72 having holes 74 be parallel with the opponent member and a certain amount of a width of each parallel portion be maintained, thereby arising a problem that a the dimension in a radial direction becomes great.

SUMMARY OF THE INVENTION

[0009] Accordingly, an object of the present invention is to provide a damper apparatus in which a width thereof in a radial direction is reduced.

[0010] To achieve the above object, a damper apparatus according to the present invention comprises a spring, a holder for holding the spring, and a plate having a pawl elastically engaged by the spring and is characterized in that splines are provided on an inner peripheral portion and an outer peripheral portion of the damper apparatus.

[0011] Further, the holder may be constituted by pinching an annular ring between two retainer plates.

[0012] Splines having common configuration may be provided on outer peripheries of two retainer plates, and splines may also be provided on an inner periphery of the plate having the pawl.

[0013] Further, the number of locations where the retainer plates and the ring are interconnected is increased in comparison with that in the conventional technique, and a diameter of each rivet is made smaller. With this arrangement, a width in a radial direction can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a front view of a damper apparatus according to an embodiment of the present invention;

[0015] FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1;

[0016] FIG. 3 is a front view of a conventional damper apparatus; and

[0017] FIG. 4 is a sectional view taken along the line 4-4 in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention will now be fully explained in connection with an embodiment thereof with reference to the accompanying drawings. Incidentally, in the drawings, the same elements are designated by the same reference numerals. FIG. 1 is a front view of a damper apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1.

[0019] A damper apparatus 1 is constituted by substantially annular retainer plates 11, 12 and a ring 33. The damper apparatus 1 includes a holder 35 provided at its outer periphery with a plurality of splines 42 equidistantly arranged along a circumferential direction. Within a cavity defined by the holder 35, a plurality of sets of small and large springs 31, 32 (one small spring 31 and one large spring 32 constitute one set) are disposed at predetermined position with intervals substantially equidistant in circumferential direction. The small spring 31 and the large spring 32 are coil springs having predetermined spring constants, and the small spring 31 is fitted within the large spring 32.

[0020] The damper apparatus 1 further includes a substantially annular plate 13 having pawls 14 elastically engaged by the small spring 31 and the large spring 32 and a plurality of spines 41 disposes on an inner periphery thereof with intervals substantially equidistant in a circumferential direction and piece member 15 disposed between the plurality of small springs 31 and large springs 32 are movable in the cavity defined by the holder 35.

[0021] The damper apparatus 1 is assembled by fitting one of opponent members on the inner splines 42 and by fitting the other of the opponent members on the inner splines 41. Further, the retainer plates 11, 12 and the ring 33 are integrally secured to each other by inserting rivets 23 into axial through-holes 24 provided in these elements. As shown in FIG. 1, the plurality of through-holes 24 are disposed substantially equidistantly along the circumferential direction. Further, since the rivets 23 each having a diameter smaller than that in the prior art are used, widths of the retainer plates 11, 12 in a radial direction can be reduced.

[0022] The retainer plates 11, 12 are provided with a plurality of bent portions 25 adapted to regulate movements of the small springs 31 and the large spring 32 and arranged at predetermined positions in the circumferential direction. As a result, when torque is transmitted, if vibration is generated between the holder 35 and the substantially annular plate 13, the small springs 31 and the large springs 32 are compressed between the pawls 14 and the bent portions 25, thereby absorbing the vibration.

[0023] In the illustrated embodiment, while an example that the splines are provided on the outer periphery of the holder 35 and the inner periphery of the plate 13 having the pawls 14 was explained, the splines may be provided on an inner periphery of the holder and an outer periphery of the plate. That is to say, a damper apparatus according to the present invention can be obtained in such a manner that the pawls 14 are provided on the inner periphery of the plate 13 and the splines are machined on the outer periphery of the plate 13, and further, the holder 35 is assembled by effecting caulking on inner periphery of the holder. Further, when the diameters of the retainer plates are reduced and the diameter of the ring 33 is increased, the outer splines may be provided on the ring 33.

[0024] The above-mentioned damper apparatus 1 is used with a torque converter used in an automatic transmission of a vehicle by arranging it in a lock-up piston of the torque converter. Alternatively, the damper apparatus can be used with a starting clutch.

[0025] The above-mentioned present invention provides the following advantages.

[0026] Since the plates are interconnected via the splines, a width of the damper apparatus in the radial direction can be reduced.

[0027] Since the holder for holding the springs is constituted by pinching the annular ring between two retainer plates, strength of the damper apparatus can be enhanced, and attaching accuracy can be improved by lengthening axial dimensions of the splines.

Claims

1. A damper apparatus comprising: a spring; a holder for holding said spring; and a plate having a pawl elastically engaged by said spring, wherein splines are provided on an inner peripheral portion of said plate and an outer peripheral portion of said holder.

2. A damper apparatus according to claim 1, wherein said holder is constituted by pinching an annular ring between two retainer plates.

3. A damper apparatus according to claim 1, wherein said holder includes an annular ring disposed between two retainer plates.

4. A damper apparatus according to claim 3, wherein the annular ring has a substantial equal thickness in the axial direction to the thickness of the plate in the axial direction and wherein said splines are formed on said two retainer plates and a rivet is disposed through a Splines of each of said retainer plates and said annular ring.

5. A damper apparatus comprising: a spring; a holder for holding said spring; and a plate having a pawl elastically engaged by said spring, wherein splines are provided on an inner peripheral portion of said holder and an outer peripheral portion of said plate.

6. A damper apparatus according to claim 5, wherein said holder includes an annular ring disposed between two retainer plates.

7. A damper apparatus comprising: a spring; a holder holding said spring and including two retainer plates; a plate having a pawl elastically engaged by said spring; and an annular ring disposed between said two retainer plates; wherein splines are provided on an inner peripheral portion of at least one of said plate and said holder and an outer peripheral portion of the other of said plate and said holder and wherein opposite end surfaces of said annular ring are substantially aligned with opposite end surfaces of said plate in an axial direction.

8. A damper apparatus according to claim 7, wherein said holder includes an annular ring disposed between two retainer plates.

9. A damper apparatus according to claim 8, wherein said splines are provided on said two retainer plates of said holder.

10. A damper apparatus according to claim 9, wherein a rivet is disposed through a spline of each of said retainer plates and said annular ring.