FR3044377A1 - LUBRICATING CHUTE OF A GEARBOX GEAR TRAIN - Google Patents

Abstract

Lubrication channel of a gear train (1a, 6; 1b, 7; 1c, 8; 1d, 9; 1a, 10; 1f, 11) of a rotational gearbox in a gear and differential housing , forming in its lower part a lubricant reservoir which is immersed the bottom of the ring (4a) of the differential so that its rotation causes the elevation and projection of lubricant towards the chute (5) which captures the projected lubricant and distributes it on the areas to be lubricated (5b) of the gear train, characterized in that the catch area of the chute is offset beyond the high point of the ring gear with respect to the lubricated gear train ( la, 6; 1b, 7; 1c, 8; 1d, 9; 1a, 10; 1f, 11).

Description

LUBRICATION CHUTE OF A GEAR GEAR

OF SPEEDS

The present invention relates to the field of gearboxes with parallel gears and shafts. It relates to the lubrication of a transmission gear train, from the oil retained at the bottom of its housing.

More specifically, it relates to a lubricating trough of a rotating gearbox gear train in a gearbox and differential housing, forming in its lower part a lubricant reservoir where is immersed the bottom of the differential ring, so that its rotation causes the elevation and the projection of lubricant towards the chute which captures the projected lubricant, and distributes it on the areas to be lubricated of the gear train.

Gearbox performance targets, including reducing their impact on the overall fuel consumption / carbon dioxide emissions of vehicles, lead to the implementation of adapted lubrication systems, which capture the projected oil, in the box for distribution. in the desired places, for example on the gears of the secondary line, and behind the bearing of the primary line. The implementation of a lubrication chute in a gearbox poses a particular architectural problem, when the reverse line is placed in the up position, with a reverse gear which largely masks the access to the gearbox. differential ring. The diagram of Figure 1, showing such a gearbox in front view in the vehicle position flat, illustrates this implantation problem.

The parallel shaft gearbox illustrated by the three figures, has a primary line 1, a secondary line 2, a reverse line 3 (whose reverse gear 3a forms the largest diameter), and a differential 4 ( whose crown 4a forms the largest diameter). A gear train transmits torque received from the motor (not shown) between the primary and secondary lines. In this arrangement the secondary line 2 is located below the primary line 1. It is also located below the reverse line 3 and the highest point of the differential ring 4a. However, it is desired to lubricate this gear train, by distributing the oil projected by the differential ring. The box and the differential are enclosed in a mechanism and differential sealed housing (not shown), forming in its lower part a lubricant reservoir in which is immersed the bottom of the differential ring 4a. Its rotation causes the elevation and the projection of lubricant that it is desired to distribute on areas to be lubricated of the gear train, and on the bearing of the primary line.

FR 2 751 726 discloses an arrangement for lubricating a gear train of horizontal axes rotatably mounted in a sealed casing, the bottom of which constitutes a main reservoir, in which the lower part of the casing is permanently quenched. a differential ring. This arrangement has a guide surface with a U-shaped notch surrounding the differential ring, on the inside of the box, to orient the captured lubricant, to a spill reservoir on the gears. This arrangement, where the lubrication arrangement is housed between the secondary line and the differential, is allowed by the space available inside the box, between the differential and the mechanism. It is impossible in the case of Figure 1, with a third shaft and a third line of gears, disposed above the secondary line.

The present invention aims to capture the lubricating oil projected in a three-shaft gearbox by the ring gear of the differential, to lubricate a gear train, despite the presence of a line of upper gears, occupying the space between the train to be lubricated and the differential.

For this purpose, it proposes that the catch area of the chute, is offset beyond the high point of the differential ring, relative to the lubricated gear train. The invention will be better understood on reading the following description of an embodiment, not limiting thereof, with reference to the accompanying drawings, in which: FIG. 1 is a simplified front view of a gearbox in the upper reverse line, FIG. 2 is a view from above of the same gearbox with the proposed chute, and FIG. 3 a front view corresponding to FIG. 2.

FIGS. 2 and 3 show the box of FIG. 1, with its primary line 1, its secondary line 2, its reverse line 3, and its differential 4. It also includes the proposed lubricating chute 5. It has a capture area 5a offset from the secondary line 2, bores 5b to discharge the oil on the pinions 6, 7, 8, 9, 10, located at the right of the secondary shaft, and a spout 5c to dump the oil behind the bearing of the primary line. The invention consists in sensing the oil in the zone 5a offset relative to the secondary line 2. The chute 5 bypasses the reverse gear 3a belonging to the reverse line 3, which is offset towards the differential 4, by report to secondary line 2.

The capture zone 5a of the chute 5 is offset beyond the high point of the differential ring 4a, with respect to the lubricated gear train 1a, 6; lb, 7; The 8th; ld, 9; The 10 ; 11. The oil supply of the secondary gears 6, 7, 8, 9, 10 and the bearing 12 of the primary line bypasses for this purpose the reverse gear 3a. It also marries the entire contour of the reverse gear line 3, placed above the secondary gears 6, 7, 8, 9, 10, and the differential 4.

Capturing the oil at the differential ring allows the flow of oil in the gearbox to be channeled and controlled. The oil is thus conveyed only in the desired areas (teeth, walkmans, bearings ...) without dispersing in the box. This arrangement makes it possible to limit the volume of oil of the box to the just necessary, to optimize its yield. It is applicable to all gearboxes with parallel shafts, where the differential gear is masked by a mechanical element, which must be bypassed to pick up the oil.

Claims (4)

1. Lubrication funnel (5) of a gear train (1a, 6; 1b, 7; 1a, 8; 1d, 9; 1a, 10) of a rotating gearbox in a mechanism and differential, forming in its lower part a lubricant reservoir where is immersed the bottom of the differential ring (4a) so that its rotation causes the elevation and projection of lubricant towards the chute (5) which captures the lubricant projected and distributes it on the areas to be lubricated (5b) of the gear train, characterized in that the catch area (5a) of the chute is offset beyond the high point of the differential ring (4a) relative to to the lubricated gear train (1a, 1b, 1b, 1b, 8b, 1b, 1b, 1b, 11b). Lubricating trough according to claim 1, characterized in that it follows the contour of a pinion line (3) placed above the lubricated gear train (1a, 6; 1b, 7; ld, 9; le, 10; lf, 11) and the differential (4). 3. lubricating trunking according to claim 2, characterized in that the line of sprockets in question (3) is the reverse line. 4. Lubrication chute according to claim 3, characterized in that it bypasses a reverse gear (3a) belonging to a reverse line (3) offset towards the differential relative to the secondary line (2).