transmission

Abstract

gearbox, comprising at least functional parts and a gearbox housing (21), wherein a displacement body (1) is arranged between the functional parts and the gearbox housing (21) and is designed as a hollow body, wherein an inlet pipe (2) and an outlet pipe (3) are arranged on the displacement body (1), wherein the displacement body (1) has at least one depression (4) which is concave in shape, wherein inlet pipe (2) and outlet pipe (3) each pass through the wall of the gearbox housing (21), wherein the depression (4) is shaped as a cylindrical shell partial surface, wherein the displacement body (1) is connected to the gearbox housing (21) by means of fastening means, so that a minimum distance is maintained between the displacement body (1) and functional parts and / or gearbox housing (21), characterized by the fact that a heating element, in particular an electrically powered heating element, is arranged in the displacement body (1), wherein a coolant pump driven by a shaft of the gearbox is arranged on the gearbox, so that the displacement body (1) is subjected to a controlled flow of coolant.

Description

[0001] The invention relates to a transmission.

[0002] A cooling cover is known from DE 10 2006 020 801 A1.

[0003] A displacement body is known from DE 20 2009 003 117 U1.

[0004] From DE 102 38 000 A1 a transmission for a motor vehicle and a displacement body therefor are known.

[0005] A cooling system for a drive transmission is known from US 4 633 938 A.

[0006] From DD 271 936 A1 a device for heating a liquid in a container is known.

[0007] A gearbox with a cooling cartridge is known from DE 10 2007 024 512 A1.

[0008] DE 612 984 A discloses a splash lubrication system for a gear transmission.

[0009] An improved coolant for a transmission unit is known from GB 344 702 A.

[0010] A cooling system for a transmission is known from EP 0 785 379 A2.

[0011] From DE 103 03 416 A1, a heat exchanger unit is known as the closest prior art.

[0012] EP 0 623 767 A1 discloses a device for cooling a gear system of a crane.

[0013] An oil cooler for a gearbox is known from DE 39 04 654 A1.

[0014] The invention is therefore based on the object of developing a transmission in which high performance can be achieved in a compact installation space.

[0015] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0016] Important features of the invention in the transmission are that the transmission comprises at least functional parts and a transmission housing, wherein a displacement body is arranged between the functional parts and the gear housing and is designed as a hollow body.

[0017] The advantage of this is that the mass of the lubricating oil inside the gearbox can be reduced, thus lowering costs. Furthermore, the overall mass of the gearbox can be reduced. Furthermore, the displacement body itself is designed as a hollow body and thus has a low mass. A coolant can be provided inside the displacement body, allowing heat to be dissipated. The distance between the heat source and the coolant can be maintained very small, thus enabling effective cooling.

[0018] In an advantageous embodiment, the functional parts include gears, shafts, and associated bearings. The advantage here is that the shape of the displacement body can be adapted to the shape of the functional parts and, in particular, to the envelope of the moving functional parts.

[0019] In an advantageous embodiment, lubricating oil is provided in the gear unit, particularly between the displacement body and the functional parts. This is advantageous because the amount of lubricating oil is small, yet all gear components are lubricated.

[0020] According to the invention, an inlet pipe and an outlet pipe are arranged on the displacement body. The advantage here is that the flow through the displacement body is controllable.

[0021] According to the invention, the inlet pipe and outlet pipe each extend through the wall of the transmission housing. This advantageously allows for connection devices to be provided on the transmission housing. For example, a coolant pump can be provided on the transmission, particularly a passive one, i.e., one driven by a transmission shaft.

[0022] According to the invention, the displacement body is connected to the transmission housing by means of fastening means, in particular such that a minimum distance, in particular more than 5 mm, is maintained between the displacement body and the functional parts and / or the transmission housing. This is advantageous in that drag losses, i.e., the losses caused by the movement of lubricating oil by a moving functional part, are kept to a minimum. A minimum distance that is too small would result in greater drag losses.

[0023] In an advantageous embodiment, the displacement body is made of plastic. This is advantageous because it has a low mass.

[0024] According to the invention, coolant can flow through the displacement body. This is advantageous because it allows for direct cooling of the lubricating oil.

[0025] According to the invention, the displacement body has at least one recess that is concavely shaped, in particular shaped as a partial surface of a cylinder jacket. This is advantageous in that the distance between the functional part and the displacement body can be kept as small as possible, while maintaining a minimum distance.

[0026] According to the invention, a heating element, in particular an electrically supplied heating element, can be provided in the displacement body so that the lubricating oil and / or coolant can be heated to reach a permissible working temperature.

[0027] The invention will now be explained in more detail with the aid of illustrations: In the Fig. Figure 1 shows a displacement body 1 according to the invention, which is designed as a hollow body. Coolant, for example, oil or water, can be fed into the cavity of the displacement body 1 via an inlet pipe 2 and removed via a drain pipe 3. As in Fig. 2, the displacement body is arranged in a gear housing 21 of a transmission, wherein it is arranged between the functional parts, such as toothed parts 20, shafts connected to the toothed parts 20 together with associated bearings, and the gear housing 21.

[0028] Here, the displacement body 1 is shaped and secured to the transmission housing 21 by means of fastening means such that it maintains a minimum distance from the transmission housing 21 and the functional parts, preferably more than 5 mm. Furthermore, a maximum distance of no more than 20 or 15 mm is generally maintained to prevent excessive lubricating oil volume.

[0029] The fastening elements touch the displacement body 1 and the gear housing 21.

[0030] The displacement body 1 has a recess 4 and a further recess 5, which are concavely shaped, following the enveloping contour of a respective movable toothed part. Thus, the recesses are preferably shaped as a partial surface of the cylinder jacket.

[0031] The gearing components are therefore surrounded by a minimum amount of lubricating oil, and the displacement body allows the total amount of lubricating oil within the gearbox to be reduced, thus reducing drag losses. Furthermore, lubricating oil costs can be reduced.

[0032] Furthermore, the cooling of the transmission is improved because the displacement body acts as a heat sink and is located in close proximity to the lubricating oil. This also ensures the quick and easy dissipation of heat from the heat-generating areas of the transmission to the displacement body. List of reference symbols 1 displacement body 2 Inlet pipe 3 Drain pipe 4 Deepening 5 Deepening 20 gear 21 Gearbox housing

Claims

[1] Gearbox comprising at least functional parts and a gear housing (21), wherein a displacement body (1) is arranged between the functional parts and the gear housing (21) and is designed as a hollow body, wherein an inlet pipe (2) and an outlet pipe (3) are arranged on the displacement body (1), wherein the displacement body (1) has at least one recess (4) which is concavely shaped, wherein the inlet pipe (2) and the outlet pipe (3) each pass through the wall of the gearbox housing (21), wherein the recess (4) is formed as a cylinder jacket surface, wherein the displacement body (1) is connected to the gear housing (21) by means of fastening means, so that a minimum distance is maintained between the displacement body (1) and functional parts and / or gear housing (21), characterized by , that a heating element, in particular an electrically supplied heating element, is arranged in the displacement body (1), wherein a coolant pump driven by a shaft of the transmission is arranged on the transmission, so that the displacement body (1) is flowed through by coolant in a controlled manner. [2] Transmission according to claim 1, characterized by that the functional parts include gearing parts, shafts and associated bearings. [3] Transmission according to at least one of the preceding claims, characterized by that lubricating oil is provided in the gearbox between the displacement body (1) and the functional parts. [4] Transmission according to at least one of the preceding claims, characterized by that the minimum distance is more than 5 mm. [5] Transmission according to at least one of the preceding claims, characterized by that the displacement body (1) is made of plastic.

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