POWER TRANSMISSION DEVICE

Abstract

Power transmission device (1), comprising:a damper (40) provided on a power transmission path, which is configured to reduce vibrations; and a clutch mechanism (25) having a plurality of friction discs, a hydraulic pressure chamber (42), and a centrifugal force compensation chamber (48) provided opposite the hydraulic pressure chamber (42), wherein the clutch mechanism (25) is provided adjacent to an axial side part of the damper (40), and wherein an oil drain port (58b) for hydraulic fluid supplied to the centrifugal force compensation chamber (48) of the clutch mechanism (25) is provided at a location radially inward of the damper (40) and axially overlaps the damper (40), characterized in that the damper (40) is provided with a friction generating mechanism (70, 72) configured to cause the damper (40) to generate a predetermined hysteresis characteristic during power transmission.

Claims

[1] Power transmission device (1), comprising: a damper (40) provided on a power transmission path and arranged to reduce vibrations; and a clutch mechanism (25) having a plurality of friction discs, a hydraulic pressure chamber (42) and a centrifugal force compensation chamber (48) provided opposite the hydraulic pressure chamber (42), wherein the coupling mechanism (25) is provided adjacent to an axial side part of the damper (40), and wherein an oil drain port (58b) for hydraulic fluid supplied to the centrifugal force compensation chamber (48) of the clutch mechanism (25) is provided at a location radially inward of the damper (40) and axially overlaps the damper (40), characterized by , that the damper (40) is provided with a friction generating mechanism (70, 72) which is arranged to cause the damper (40) to generate a predetermined hysteresis characteristic during power transmission. [2] The power transmission device (1) according to claim 1, further comprising a motor (36), wherein the damper (40) is an engine vibration reducing damper configured to reduce a resonance frequency of a power transmission system from an internal combustion engine (2) to wheels through the power transmission device (1) and a transmission (6) to a range lower than a normally used range of the internal combustion engine (2), the resonance frequency being attributable to the motor (36). [3] Power transmission device (1) according to one of the preceding claims, further comprising: a sealing plate (50) provided on the side of the damper (40) and defining the centrifugal force compensation chamber (48); and a retaining ring (58) with a predetermined axial length for supporting the sealing plate (50), wherein an axially extending through-opening (58a) is formed in the retaining ring (58) as an oil passage, wherein the centrifugal force compensation chamber (48) communicates with the through opening (58a) of the retaining ring (58), wherein the oil drain port (58b) for hydraulic fluid is an outlet part of the through hole (58a) of the retaining ring (58). [4] Power transmission device (1) according to claim 3, wherein the oil drain port (58b) is provided only in the retaining ring (58). [5] Power transmission device (1) according to claim 3 or 4, further comprising: an input shaft (10) coupled to an internal combustion engine (2), wherein a groove (10b) communicating with the centrifugal force compensation chamber (48) is formed in the input shaft (10), wherein a groove (58b) is formed in a side surface part of the retaining ring (58) on the side of the sealing plate (50), and wherein the groove (10b) of the input shaft (10), the groove (58b) of the retaining ring (58) and the through-hole (58a) of the retaining ring (58) communicate with each other and are designed as oil passages which are arranged to discharge hydraulic fluid from the centrifugal force compensation chamber (48). [6] Power transmission device (1) according to claim 5, wherein an oil passage (80, 82) adapted to supply hydraulic fluid to the centrifugal force balance chamber (48) is formed in the input shaft (10) along the central axis thereof, and the oil passage (80, 82) of the input shaft (10) communicates with the centrifugal force balance chamber (48) through the groove (10b) of the input shaft (10). [7] Power transmission device (1) according to one of the preceding claims, wherein the hydraulic fluid flows from the centrifugal force compensation chamber (48) directly to the damper (40). [8] Power transmission device (1) according to one of the preceding claims, wherein an oil passage (80, 82) is provided for supplying the centrifugal force compensation chamber (48) and the damper (40) with hydraulic fluid, wherein the hydraulic fluid flows from the oil passage (80, 82) to the damper (40) without passing through the friction discs of the clutch mechanism (25). [9] Power transmission device (1) according to one of the preceding claims, further comprising: an input shaft (10), Output shaft (12); an inner rotating element (20) coupled to the input shaft (10); an outer rotary member (30) coupled to the output shaft (12) via the damper (40); wherein the clutch mechanism (25) connects the inner rotary member (20) and the outer rotary member (30) when in the engaged state; wherein the power transmission device (1) preferably further comprises a drive motor (36) with a rotor (32) and a stator (34), wherein the rotor (32) is coupled to the outer rotary element (30).

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