Retarder with optimized air outlet

Abstract

A retarder with an air outlet system is proposed, through which exhaust air from an oil tank can be directed into the environment. An exhaust air duct is integrated into a retarder housing, comprising an inlet opening and an outlet opening, with the air outlet system arranged between the outlet opening and the environment. According to the invention, the air outlet system comprises a separator element having two sections: an outer section extending outside and an inner section extending inside the exhaust air duct.

Description

The invention relates to a retarder with an optimized air outlet for introducing compressed air into the environment. In particular, an air outlet system according to the preamble of the independent claim.Hydrodynamic retarders are used, for example, as wear-free brakes in motor vehicle drive trains in order to brake the motor vehicle, in particular a truck, bus or rail vehicle, by torque transmission by means of a hydrodynamic circuit.The retarder comprises a toroidal working chamber formed by the rotor and the stator, which working chamber is connected via a duct system to a working medium circuit with a working medium tank. The ventilation of the working space takes place via a profile ventilation system, via which air can be released by means of a connection between the working space and the environment. The air present in the working space in the non-braking mode is conducted from the working space into the environment via the profile venting system when the retarder is switched into the braking mode. In order to prevent working medium, in particular oil, from also entering the environment, an oil separator and a valve are provided.Furthermore, a tank venting system is provided, via which air can be released by means of a connection between the working medium tank and the environment. Via the tank venting system, the air which is conveyed into the working medium tank for switching the retarder into the braking mode is conducted again from the tank into the environment when the retarder is switched back into the non-braking mode. In order to prevent working medium, in particular oil, from entering the environment with the air during the venting of the working medium tank, an oil separator system and a valve are provided.Both venting systems are known, for example, from DE 10 2013 207 004 A1. Special requirements are placed on the tank venting, since for switching the retarder into the braking mode the working medium must be pressed with the aid of compressed air from the working medium tank into the working chamber. The filling degree of the working chamber and thus the braking power of the retarder is dependent on the air pressure, by means of which the filling degree is regulated. This means that for the switching into the non-braking mode or for the reduction of the retarder braking torque compressed air must be discharged. In particular, when the retarder is deactivated, oil foam is formed, wherein the oil portion of the oil foam must not reach the environment. In order to prevent this, different channel guides between the working medium tank and the environment are known. Thus, CN 105 697 602 A discloses a channel guide having a plurality of separation chambers which have different structures.The permitted oil ejection of modern retarders has been reduced in such a way that the known provisions for reducing the oil ejection during venting of the working medium tank are no longer sufficient.The use of porous sintered discs which are positioned at the outlet of the retarder exhaust air duct is also known. These prevent coarse dirt from entering the retarder, the switch-off noises, when the air flows out of the retarder, exceeding a noise level and the switch-off times of the retarder being impaired.The object of the invention is to provide a solution for an improved treatment of the exhaust air at the outlet of the retarder exhaust air duct.The object is achieved according to the invention by an embodiment according to the independent claim. Further advantageous embodiments of the present invention are found in the dependent claims.A retarder with an air outlet system is proposed, via which exhaust air from an oil tank can be conducted into the environment, wherein an exhaust air channel is integrated in a retarder housing, which includes an inlet opening and an outlet opening, wherein the air outlet system is arranged between the outlet opening and the environment.According to the invention, it is proposed that the air outlet system comprises a separator element which has two partial sections, an outer section which extends outside and an inner section which extends inside the exhaust air duct. This structure of the separator element achieves a marked reduction in the proportion of oil particles that reach the environment with the exhaust air, in particular because oil deposited on the separator element already collects at the inner section and can drip back into the exhaust air duct.In a further embodiment, the air outlet system can comprise a guide device which provides an impact surface behind the separating element in the exhaust air outlet direction and by means of which the exhaust air outlet direction can be changed. The guide device can be a guide plate against which the exhaust air impinges and by which the exhaust air is deflected. This prevents any residual oil particles from getting into the environment in an uncontrolled manner. Residual oil collects on the baffle plate and can be discharged from there in a targeted manner. Uncontrolled deposition of an oil film on adjacent components is thus prevented.Furthermore, the separating element can be a wire mesh or can be manufactured from a porous material. The wire mesh can have different mesh densities in the outer section and in the inner section. In particular, the braid density can be adapted to the expected residual oil quantity in the exhaust air stream.In a preferred embodiment, it can be provided that the inner section is arranged in the exhaust air channel in such a way that the exhaust air entering the exhaust air channel through the inlet opening impinges on the inner section substantially transversely to the exhaust air outlet direction.Furthermore, an oil reservoir and an oil drain channel can be arranged in the exhaust air channel. In order to reduce the overall size of the individual separator elements, provision can be made for at least one of the two elements to be of reduced size. 3 separator elements are provided.The invention is explained below with reference to figures. The figures show in detail: FIG. 1 : Sketch of an air outlet system FIG. 2 : Exhaust air duct with three air outlet systemsFIG. 1 shows a sketch of an air outlet system 1 for a retarder. An air outlet system 1 is shown, which is composed of a separating element 4 and a guide device 7.Instead of the sintered disks known from StdT behind the outlet opening 9, the separating element 4 is designed here as a wire mesh which can be shaped as shown here. This wire mesh forms an insert which is inserted or installed from the outside into the retarder housing, so that an inner section 6 of the separating element 4 projects into the exhaust air duct 2. Oil particles in the exhaust air hang up in the interwoven mesh structure and collect on the structure.During the time between the braking processes, i.e. when no air flow is introduced from the MRCU 3 via the inlet opening 8 into the exhaust air channel, oil accumulations on the surface of the wire braid can drip back into the exhaust air channel. This oil can be collected, for example, in a reservoir and / or discharged via an oil discharge channel 11.The outer section 5 of the separator element 4 is arranged behind the outlet opening 9. After the air leaves the outer section 5, the air impinges against the guide device 7, a sheet metal part which is designed as an air guide hood and deflects the compressed air. Remaining oil quantities which emerge are collected and discharged in a targeted manner in such a way that adjacent components remain as free as possible from oil mist. FIG. 2 shows the exhaust air duct 2 with three air outlet systems. The inner sections 6 of the separating elements 4 which project into the exhaust air channel 2 are arranged in such a way that, when the retarder is switched into the non-braking mode, the air or compressed air from the tank flows laterally via the MRCU against the inner sections 6 of the separating elements 4 and these are thereby blown free. The number of filter elements, the length of the interior sections, and the position and size of the reservoir may vary.List of reference characters1 Air outlet system 2 Exhaust air duct 3 MRCU 4 Separator element 5 Outer section 6 Inner section 7 Guide device 8 Inlet opening 9 Outlet opening 10 Retarder housing 11 Oil outlet channelReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2013 207 004 A1

[0005] CN 105 697 602 A

[0005]

Claims

Retarder having an air outlet system (1) via which exhaust air from an oil tank can be conducted into the environment, wherein an exhaust air channel (2) is integrated in a retarder housing, said exhaust air channel comprising an inlet opening (8) and an outlet opening (9), wherein the air outlet system (1) is arranged between the outlet opening (9) and the environment, characterized in that the air outlet system (1) comprises a separator element (4) which has two partial sections, an outer section (5) which extends outside and an inner section (6) which extends inside the exhaust air channel (2).Retarder according to claim 1, characterised in that the air outlet system (1) comprises a guide device (7) which provides an impact surface in the exhaust air outlet direction and by means of which the exhaust air outlet direction can be changed.Retarder according to claim 1, characterised in that the separator element (4) is a wire mesh or is manufactured from a porous material.Retarder according to claim 3, characterised in that the wire mesh has different mesh densities in the outer section (5) and in the inner section (6).Retarder according to Claim 4, characterized in that the inner section (6) is arranged in the exhaust-air duct (2) in such a way that the exhaust air entering the exhaust-air duct (2) through the inlet opening impinges on the inner section (6) substantially transversely with respect to the exhaust-air outlet direction.Retarder according to Claim 1, characterized in that an oil reservoir and an oil outlet channel are arranged in the exhaust-air duct (2).Retarder according to claim 1, characterised in that the air outlet system (1) is at least one. 3 separator element (4).

Images