Double rotary seal

Abstract

The present invention relates to a double rotary seal which consists of a support (1), attached to the chassis of a lorry cab, and a rotary base (2). The rotary base (2) has a double inlet connected to two hydraulic inlet circuits (31, 32) and a double outlet consisting of two individual outlets (21, 22) ending in a connector for the corresponding hose. Moreover, the individual outlets (21, 22) are parallel and have different lengths and the rotary base (2) consists of a rotary sleeve (201) in the form of a blind pipe and a fixed cylinder (202), which has two holes (203, 204) and two perimeter chambers (205, 206) at different heights, surrounded by elastic rings (207). Each hole (203, 204) is connected to a different chamber (205, 206) and each individual outlet (21, 22) passes through the sleeve (201) at the level of a different chamber (205, 206).

Description

[0001] DOUBLE ROTARY JOINT

[0002] DESCRIPTION

[0003] TECHNICAL SECTOR

[0004] This application relates to a double rotary joint that safely and reliably connects two hydraulic circuits to the hoses that carry the hydraulic fluid to the trailer, trailer, or other element pulled by a truck.

[0005] STATE OF THE ART

[0006] The existence of hydraulic equipment on trucks for moving elements on trailers is known in the state of the art. These hoses often have to withstand high pressure, so they must be very durable. The most critical points, which can most easily fail, are the joints. This is even more so if these joints have to rotate, since this means the joint elements cannot be firmly fixed to each other.

[0007] One possible solution is to make the joints fixed, but this risks levering or clamping the hoses, which can cause them to break. Therefore, the only solution is to achieve a secure rotating joint with as many degrees of freedom as possible.

[0008] The applicant is not aware of any system that would allow the advantages of the invention to be obtained.

[0009] BRIEF EXPLANATION OF THE INVENTION

[0010] The invention consists of a rotary joint for truck hydraulic systems, according to the first claim. Its various variants solve the aforementioned problems.

[0011] For this purpose, the double seal consists of a support attached to the chassis of a truck cab and a rotating base. The rotating base has a double inlet connected to two hydraulic inlet circuits and a double outlet consisting of two individual outlets terminating in a connector for the corresponding hose. Preferably, the individual outlets are parallel and of different lengths.

[0012] Individual, parallel outlets can include a connecting piece that connects both to increase mechanical strength. Thus, when one is working, the structure of the other individual outlet helps to withstand the stresses.

[0013] Other variations can be seen in the rest of the report.

[0014] DESCRIPTION OF THE FIGURES

[0015] For a better understanding of the invention, a section of drawings is included containing the following:

[0016] Figure 1: Diagram of an example of a double joint according to the invention.

[0017] Figure 2: Schematic section of an example of a rotating base at the height of an individual exit.

[0018] Figure 3: Schematic section of the rotating base example at the height of the other individual exit.

[0019] Figure 4: Perspective view of the shirt in the example in Figure 2 from the outside.

[0020] Figure 5: Perspective view of the rotating base of the example in Figure 2 from below.

[0021] MODES OF EMBODIMENT OF THE INVENTION

[0022] Below, a brief description is given of an embodiment of the invention, as an illustrative and non-limiting example thereof.

[0023] The equipment of the invention will be described with the help of Figure 1, which shows an exemplary embodiment. The seal starts from a support (1) that is generally coupled to the chassis of the cabin. On the support (1) there is a rotating base (2), connected to the hydraulic circuit. The rotating base (2) has a double inlet, connected to two hydraulic input circuits (31, 32), and a double outlet that is connected to the hoses that carry the hydraulic fluid to the points of use. It can be seen that the individual outlets (21, 22) represented, which form the double outlet, are of different lengths. The individual outlets (21, 22) are normally finished in a threaded connector for the hose (not shown), although the connector can be of any type. A connecting piece (23) connects the two individual outlets (21, 22) to increase the resistance of the seal.

[0024] The connection between the base (2) and each hydraulic circuit (31,32) must allow a watertight connection at high working pressures (up to 500 bar). Figure 2 shows a diagram of the interior. It shows how the rotating base (2) is formed by a rotating sleeve (201) in the form of a blind tube, to which the individual outlets are connected, and a fixed cylinder (202), inside the sleeve (201): The cylinder (202) is connected to the support (1), directly or indirectly, to remain immobilized. The cylinder (202) has two holes (203,204) in its accessible area (opposite the blind part of the sleeve (201)) communicated with two perimeter chambers (205,206) at different heights. The chambers

[0025] (205,206) are represented by slots inside the sleeve (201). A series of elastic rings (207) separate the chambers (205,206) from each other and from the outside of the rotating base (2). Each hole (203,204) connects to a chamber

[0026] (205,206) different, so that the hydraulic fluids do not mix. In turn, each individual outlet (21,22) passes through the sleeve (201) by means of a drill (208,209) at a different height or inclination, so that it connects with one or the other chamber

[0027] (205.206).

[0028] In use, when one of the hydraulic circuits (31, 32) is activated, it carries the pressure of the hydraulic fluid through the corresponding orifice (203, 204) towards the chamber (205, 206) connected to the correct individual outlet (21, 22). As this individual outlet (21, 22) is connected to a peripheral chamber (205, 206), its orientation is irrelevant and the rotating base (2) can rotate 360°. In any angular position the individual outlet (21, 22) contacts the chamber (205, 206) and the pressure is transmitted to the hose.

Claims

CLAIMS 1- Double joint, characterized in that it is formed by a support (1) attached to the chassis of the cabin of a truck and a rotating base (2), where the rotating base (2) has a double input connected to two hydraulic input circuits (31, 32) and a double output formed by two individual outputs (21, 22) ending in a connector for the corresponding hose. 2- Double joint, according to claim 1, characterized in that the individual outlets (21, 22) are parallel and of different lengths. 3- Double joint, according to claim 1, characterized in that it comprises a connecting piece (23) that connects the two parallel individual outputs (21,22). 4- Double seal, according to claim 1, characterized in that the rotating base (2) is formed by: a rotating sleeve (201) in the form of a blind tube, to which the individual outlets (21, 22) are connected, and a fixed cylinder (202), inside the sleeve (201), which has two holes (203, 204) in its area opposite the blind part of the sleeve (201) and two perimeter chambers (205, 206) at different heights, surrounded by elastic rings (207) and where each hole (203, 204) connects with a different chamber (205, 206), where each individual outlet (21, 22) passes through the sleeve (201) at the height of a different chamber (205, 206).

Images