GEARBOX LUBRICATION CHUTE AND GEARBOX COMPRISING SUCH A CHUTE

Abstract

The present invention relates to a lubrication system (1) for a gearbox comprising an oil distribution chute (2) and an oil supply pipe (3) extending between the distribution chute (2) and a tapping point (4) intended to be positioned in an oil collection zone of a gearbox, characterized in that the supply pipe (3) comprises an oil trap siphon (5). Figure for the abstract: 1

Description

Title of the invention: GEARBOX LUBRICATION CHUTE AND GEARBOX COMPRISING SAME SUCH A CHUTE Technical field of the invention

[0001] The present invention relates to a lubrication chute for a gear line of a gearbox.

[0002] The invention also relates to a gearbox equipped with such a lubrication chute. Technical background

[0003] The invention relates to gearboxes. It concerns the lubrication of gearbox gears, from the oil retained at the bottom of its casing.

[0004] More specifically, the invention relates to a lubrication chute for a line of rotating gears in a sealed casing of a gearbox and / or its associated differential, the body of which has a collection zone receiving the oil projected towards the top of the gearbox by pinions or toothed crowns, and a zone for the flow and discharge of the oil at targeted lubrication points along the line of gears.

[0005] Such lubrication chutes by distribution of oil in a gearbox are illustrated in particular by documents FR-A1-3082264 and FR-A1-3089588 to the content of which reference may be made.

[0006] In a known manner, the lubrication chute is generally made of a single piece of plastic material and, for its positioning and maintenance in functional position in the casing, the lubrication chute most often comprises several supports for retaining the lubrication chute in the casing.

[0007] For example, each retaining support is produced in the form of one or more parallel fingers which extend axially in a direction orthogonal to a joint plane for assembling two complementary parts of the casing and each of which is received in a hole in the casing.

[0008] Often, the oil supply line extends between an oil tapping point at the capture area and the chute. As a general rule, if the oil pump stops, it will lose its prime and the oil supply line will empty its oil into the capture area. Depending on the architecture of the gearbox, the distance between the tapping point and the chute can be significant, the length of the supply lines has a negative impact on the re-priming time of the oil pump, thus leading to an increase in the time during which the element to be lubricated is no longer supplied with oil, which can prematurely damage a bearing, a seal, a gear or any other element of the shaft line requiring good lubrication.

[0009] This problem is particularly recurrent in the gearboxes of vehicles equipped with “stop-start” systems, also called “stop and start” systems. Summary of the invention

[0010] The invention relates to a gearbox lubrication system comprising an oil distribution chute and an oil supply pipe extending between the distribution chute and a tapping point intended to be positioned in an oil collection zone of a gearbox, the supply pipe comprising an oil trap siphon.

[0011] The oil seal siphon allows the creation of a sufficient oil reserve so as to quickly supply the elements of the gearbox requiring significant lubrication, for example gears, bearings, and / or seals, or for example a differential device. Thus the lubrication system according to the invention allows the lubrication system to be primed more quickly and the elements requiring lubrication to be supplied in the event, for example, of ignition of an internal combustion engine of the “Automatic Stop-Start” type.

[0012] The invention may include in particular one of the following characteristics, taken alone or in combination with other characteristics as long as they are technically compatible: - the supply line comprises a collection zone extending between the tapping point and the oil trap, a trap zone in which the oil trap extends, and a distribution zone, extending between the oil trap and the distribution chute; - the length of the capture zone is greater than the length of the distribution zone, so the oil guard siphon is located as close as possible to the oil distribution chute for maximum reduction in the lubrication system reset time; - the supply line comprises a plurality of oil trap siphons along its length, thus the supply line comprises a plurality of oil reserve pockets; - the siphon comprises an area of the pipe having a substantially U shape; - the siphon comprises a reservoir advantageously in the form of a tank, the tank with an oil inlet and an oil outlet in the high position, thus avoiding the communicating vessel effect which could cause the tank to drain. The high position of the tank means the relative position of the oil inlets and outlets once the tank is assembled in a gearbox compared to its normal position when assembled on a vehicle. - The system further comprises an oil pump intended to pressurize the circuit and convey the oil from the tapping point to the distribution chute. - The system supply line is intended to be fixed on or integrated, or even partially integrated, into a gearbox housing. By integrated or partially integrated into a housing, we mean that the line extends at least over part of its length in the wall of the gearbox housing. By fixed on, we mean that the line takes the form of a pipe comprising, in a known manner, supports allowing attachment to the housing.

[0013] The invention further relates to a gearbox comprising a lubrication system according to the invention, in which the tapping point of the oil supply pipe is positioned in a capture zone of the gearbox and the chute is positioned in a high position relative to the capture zone, advantageously the chute is positioned directly above an element of the gearbox requiring lubrication, for example a shaft comprising for example gears, bearings, and / or seal, or for example a differential device.

[0014] The gearbox comprises a casing delimiting an internal volume in which the lubrication system according to the invention extends at least partially; in certain embodiments, the lubrication system may further extend at least partially in the thickness of the gearbox casing. Brief descriptions of the figures

[0015] Other characteristics and advantages of the invention will appear during the reading of the detailed description below for the understanding of which reference will be made to the appended drawings in which:

[0016] [Fig-1] - [Fig.l] is a schematic view of a lubrication system according to a first embodiment of the invention,

[0017] [Fig.2] - [Fig.2] is a schematic view of a lubrication system according to a second embodiment of the invention. Detailed description of the invention

[0018] In the following description, identical, similar or analogous elements will be designated by the same reference numbers.

[0019] Figures 1 and 2 show a lubrication system 1 for a gearbox. gears (not shown) comprising an oil distribution chute 2 and an oil supply pipe 3 extending between the distribution chute 2 and a tapping point 4 intended to be positioned in an oil collection zone of a gearbox, the supply pipe 3 comprising an oil trap siphon 5.

[0020] The distribution pipe 2 further comprises a collection zone C extending between the tapping point 4 and the oil seal siphon 5, a siphon zone S in which the oil seal siphon 5 extends, and a distribution zone D, extending between the oil seal siphon 5 and the distribution chute 2.

[0021] The length of the collection zone is greater than the length of the distribution zone. Thus the siphon 5 is positioned as close as possible to the chute 2.

[0022] The lubrication system further comprises an oil pump 7 intended to pressurize the circuit and convey the oil from the tapping point 4 to the distribution chute 2.

[0023] The distribution chute comprising at least one flow opening intended to supply an area of interest (bearing for example) of the gearbox with oil.

[0024] [Fig. 1] illustrates a first embodiment in which the siphon 5 comprises a siphon zone S of the pipe having a substantially U-shape.

[0025] [Fig. 2] illustrates a second embodiment in which the siphon comprises a reservoir 6, the reservoir 6 having an oil inlet 61 and an oil outlet 62 in the upper position of said reservoir, the positioning of the inlet 61 and outlet 62 thus making it possible to avoid the communicating vessel effect causing the reservoir to be emptied once the lubrication system is mounted in a gearbox.

[0026] The chute 2 is positioned directly above an element 8 of the gearbox requiring lubrication, here represented as a shaft comprising gears.

Claims

Claims

1. Lubrication system (1) for a gearbox comprising an oil distribution chute (2) and an oil supply pipe (3) extending between the distribution chute (2) and a tapping point (4) intended to be positioned in an oil collection zone of a gearbox, characterized in that the supply pipe (3) comprises an oil trap siphon (5).

2. Lubrication system according to the preceding claim in which the distribution pipe (2) comprises a collection zone (C) extending between the tapping point (4) and the oil seal siphon (5), a siphon zone (S) in which the oil seal siphon (5) extends, and a distribution zone (D), extending between the oil seal siphon (5) and the distribution chute (2).

3. Lubrication system according to the preceding claim, in which the length of the capture zone is greater than the length of the distribution zone.

4. A lubrication system according to any preceding claim, wherein the siphon comprises a siphon area (S) of the pipe having a substantially U-shape.

5. Lubrication system according to one of the preceding claims in which the siphon comprises a reservoir (6), the reservoir (6) having an oil inlet (61) and an oil outlet (62) in the high position.

6. Lubrication system according to one of the preceding claims, further comprising an oil pump (7) intended to pressurize the circuit and convey the oil from the tapping point (4) to the distribution chute (2).

7. Gearbox comprising a lubrication system (1) according to one of the preceding claims, in which the tapping point (4) of the oil supply pipe (3) is positioned in a capture zone of the gearbox and the chute (2) is positioned in a high position relative to the capture zone, advantageously the chute is positioned directly above an element of the gearbox requiring lubrication.

8. Gearbox according to the preceding claim comprising a casing delimiting an internal volume in which extends, at least par- the lubrication system.

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