Vehicle drive transmission system

Abstract

To provide a vehicle drive transmission device which can achieve simplification and downsizing of a structure and avoid a difference from occurring in torque transmitted to a first output member and a second output member due to variations in engagement force of a frictional engagement device.SOLUTION: A first speed reducer 3A is a planetary gear mechanism including an input element 31A which integrally rotates with a first differential output element 22, an output element 32A which integrally rotates with a first output member 4A, and a fixed element 33A which integrally rotates with a first fixed gear 5A. A second speed reducer 3B is a planetary gear mechanism including an input element 31B which integrally rotates with a second differential output element 23, an output element 32B which integrally rotates with a second output member 4B, and a fixed element 33B which integrally rotates with a second fixed gear 5B. A first fixing gear 6A configured to engage with the first fixed gear 5A and a second fixing gear 6B configured to engage with the second fixed gear 5B integrally rotate and are engaged with a non-rotary member NR through a frictional engagement device 7.SELECTED DRAWING: Figure 1

Claims

1. An input member connected to a drive source, A first output member is driven and connected to the first wheel, A second output member is driven and connected to the second wheel, A differential gear mechanism comprising a differential input element, a first differential output element, and a second differential output element connected to the input member so as to rotate integrally with the input member, which distributes the torque transmitted from the input member to the differential input element to the first differential output element and the second differential output element, A first reduction gear that reduces the rotation of the first differential output element and transmits it to the first output member, A vehicle drive transmission device comprising: a second reduction gear that reduces the rotation of the second differential output element and transmits it to the second output member, The first reduction gear is a planetary gear mechanism comprising a first reduction input element connected to rotate integrally with the first differential output element, a first reduction output element connected to rotate integrally with the first output member, and a first reduction fixed element connected to rotate integrally with the first fixed gear. The second reduction gear is a planetary gear mechanism comprising a second reduction input element connected to rotate integrally with the second differential output element, a second reduction output element connected to rotate integrally with the second output member, and a second reduction fixed element connected to rotate integrally with the second fixed gear. A vehicle drive transmission device comprising a first fixed gear that meshes with the first fixed gear and a second fixed gear that meshes with the second fixed gear, which are connected to each other so as to rotate integrally and are engaged with a non-rotating member via a friction engagement device.

2. The aforementioned drive source is a rotating electric machine equipped with a stator and a rotor, The input member is a rotor shaft that rotates integrally with the rotor, The rotor shaft, the differential gear mechanism, the first reduction gear, and the second reduction gear are arranged coaxially with each other. The direction along the rotation axis of the rotor shaft is defined as the axial direction, The first reduction gear and the second reduction gear are arranged separately on both sides in the axial direction relative to the rotating electric machine and the differential gear mechanism. The first fixed gear and the second fixed gear are arranged coaxially with respect to each other. The vehicle drive transmission device according to claim 1, wherein the first fixed gear and the second fixed gear are arranged on separate axes parallel to the rotation axis.

3. The first reduction fixing element comprises a first annular portion formed in an annular shape and a first ring gear with internal teeth provided on the inner circumferential surface of the first annular portion. The second reduction fixing element comprises a second annular portion formed in an annular shape and a second ring gear with internal teeth provided on the inner circumferential surface of the second annular portion. The first fixed gear is an external gear provided on the outer circumferential surface of the first annular portion, The vehicle drive transmission device according to claim 2, wherein the second fixed gear is an external gear provided on the outer circumferential surface of the second annular portion.

4. The direction perpendicular to the aforementioned axis of rotation is defined as the radial direction, The vehicle drive transmission device according to claim 2 or 3, wherein the differential gear mechanism is positioned radially inward from the stator and overlaps with the stator in a radial view along the radial direction.

5. The first reduction gear further comprises a third reduction fixing element connected to rotate integrally with the third fixed gear, The second reduction gear further comprises a fourth reduction fixing element connected to rotate integrally with the fourth fixed gear, The friction engagement device is designated as the first friction engagement device. The third fixed gear that meshes with the third fixed gear and the fourth fixed gear that meshes with the fourth fixed gear are connected so as to rotate integrally with each other, and are engaged with the non-rotating member via the second friction engagement device. The first reduction gear is configured such that the gear ratio between the first reduction input element and the first reduction output element differs depending on whether the first reduction fixing element is fixed to the non-rotating member or the third reduction fixing element is fixed to the non-rotating member. The vehicle drive transmission device according to claim 1, wherein the second reduction gear is configured such that the gear ratio between the second reduction input element and the second reduction output element is different when the second reduction fixing element is fixed to the non-rotating member and when the fourth reduction fixing element is fixed to the non-rotating member.

Images