JP2542711Y2 - Power transmission for automatic transmission - Google Patents

Description

The present invention relates to a power transmission device applied to an automatic transmission of an automobile.

2. Description of the Related Art Generally, as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 57-100653, this kind of power transmission device has an input member fixed to an end of a crankshaft and a substantially disc-shaped power member fixed to a converter housing. The output member and the output member are assembled so as to be relatively rotatable. Windows are formed at the same positions in the circumferential direction of the input member and the output member. A compression coil spring is housed in the window, and the input member and the output are output by the compression coil spring. The member is elastically connected to the rotating direction. As a result, the rotational power of the crankshaft is transmitted to the converter housing via the compression coil spring.

Problems to be Solved by the Invention However, such a conventional power transmission device can use a compression coil spring having a long flexure amplitude because it is necessary to secure strength between the windows of the input member and the output member. However, when it is necessary to allow a large torsional angle and absorb torsional vibration with relatively low torsional rigidity, a sufficient vibration absorbing effect cannot be exhibited.

Therefore, an object of the present invention is to provide a power transmission device capable of solving such a problem of the related art.

Means for Solving the Problems That is, the power transmission device of the present invention comprises a drive plate fixed to an outer peripheral edge of an end face of a converter housing with bolts, and a hub fixed to an end of a crankshaft and the drive plate. In a power transmission device for an automatic transmission, which is elastically connected in a rotation direction via a spring member, an inner peripheral edge of the drive plate is rotatably fitted and supported on a crankshaft, while the spring member is Are formed by radially extending tension coil springs, and one end of the tension coil spring is supported by the hub, and the other end is supported by the bolt for fixing the drive plate.

The crankshaft and the converter housing can rotate relative to each other with a sufficient torsion angle within a range in which the tension coil spring connecting the two does not interfere with each other. Therefore, torsional vibration generated in the power transmission system is effectively absorbed.

In addition, run-out between the crankshaft and the converter housing during power transmission is suppressed by the fitting between the inner peripheral edge of the drive plate and the crankshaft, and the radially outer end of the extension coil spring is driven by the drive. The plate is securely supported by the drive plate and the converter housing without providing a special spring support pin on the plate.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2, reference numeral 1 denotes a substantially disk-shaped hub.
It is fixed by tightening. Reference numeral 4 denotes a substantially disk-shaped drive plate. The drive plate 4 has an inner peripheral edge 4a.
Is slidably and rotatably fitted on the outer periphery of the crankshaft 2, and the outer peripheral end thereof is fixed to the converter housing 6 together with the spacer 5 with bolts 7. Reference numeral 8 denotes a low-rigidity tension coil spring. This tension coil spring 8
A plurality of radially arranged crankshafts 2 are arranged radially around one end, one end of which is pivotally supported by a rivet 10 via a spacer 9 and the other end is supported by a bolt 7 fixed to a converter housing 6 via a spacer 5. Let me do it.

Reference numeral 11 denotes a ring gear that meshes with a starter motor (not shown).

According to the structure of the embodiment described above, when transmitting the rotational power from the crankshaft 2 to the converter housing 6, the crankshaft can be moved within a range where the extension coil springs 8 radially connecting the crankshaft 2 and the converter housing 6 do not interfere with each other. 2 and the converter housing 6 relatively rotate with a sufficient torsion angle. by this,
The torsional vibration of the power transmission system is effectively absorbed by the low-rigidity tension coil spring 8, and generation of abnormal noise from the power transmission system is suppressed. Further, according to the present embodiment, the tension coil spring 8
Is supported by the converter housing 6 via bolts 7 for fixing the drive plate 4, so that it is not necessary to provide the drive plate 4 with a special pin for supporting a spring. In addition to this, the run-out of the crankshaft 2 and the converter housing 6 can be suppressed by fitting the inner peripheral portion 4a of the drive plate 4 and the crankshaft 2, so that the drive plate 4 is placed on one side of the hub 1. It is possible to place them only.
Therefore, as compared with the conventional power transmission device in which a pair of drive plates are arranged on both sides of the hub so as to face each other, the structure can be simplified and downsized, particularly, the thickness can be reduced, and the number of parts and weight can be reduced. As a result, it is possible to provide a power transmission device that occupies little space and can be manufactured at relatively low cost.

Effect of the Invention As described above, the power transmission device of the present invention allows the inner peripheral edge portion of the drive plate to be rotatably fitted and supported on the crankshaft, while the spring members are radially arranged by the tension coil springs. Since the tension coil spring is configured such that one end of the tension coil spring is supported by the hub and the other end is supported by the bolt for fixing the drive plate, the crankshaft and the converter have a sufficient torsion angle as long as the tension coil springs do not interfere with each other. The housing and the housing can be relatively rotated. As a result, an excellent vibration absorbing effect and an effect of suppressing generation of abnormal noise can be exhibited in a region where vibration absorption and generation of abnormal noise cannot be sufficiently reduced in the conventional example.

In the power transmission device of the present invention, the runout between the crankshaft and the converter housing is suppressed by fitting the inner peripheral edge of the drive plate to the crankshaft, and the radially outer end of the extension coil spring is driven by the drive plate. Since the drive plate and the converter housing are supported via fixing bolts, there is no need to provide a special pin for supporting the radially outer end of the extension coil spring on the drive plate. Both hubs can be formed of a single plate material. As a result, it is possible to reduce the manufacturing cost by reducing the number of parts and to achieve the thinning required for the power transmission device of the automatic transmission. .

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of a power transmission device (an enlarged sectional view along line II-II in FIG. 2) showing an embodiment of the present invention, and FIG. 2 is a front view of the power transmission device with a left half omitted. FIG. DESCRIPTION OF SYMBOLS 1 ... Hub, 2 ... Crankshaft, 4 ... Drive plate, 4a ... Inner peripheral edge, 6 ... Converter housing, 7 ... Bolt, 8 ... Tension coil spring.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 57-100653 (JP, U) Japanese Utility Model Showa 63-110723 (JP, U) Japanese Utility Model Showa 61-32852 (JP, U) Japanese Utility Model Showa 64- 46549 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A drive plate is fixed to an outer peripheral edge of an end face of a converter housing with bolts, and a hub fixed to an end of a crankshaft and the drive plate are elastically rotated in a rotating direction via a spring member. In the power transmission device for an automatic transmission, the inner peripheral edge of the drive plate is rotatably fitted and supported on a crankshaft, and the spring member is configured by a tension coil spring radially arranged. A power transmission device for an automatic transmission, wherein one end of the tension coil spring is supported by the hub and the other end is supported by the bolt for fixing a drive plate.