reducer

Abstract

According to the present invention, a reducer for mounting on a transmission is proposed, the reducer comprising a housing device (12) and a shaft (2), the housing device enclosing a reducer oil chamber (7), the shaft having a first section (13) and a second section (14), the rotor being arranged in a rotationally fixed manner on the first section, and the step-up gear (3) being arranged in a rotationally fixed manner on the second section. The first section is positioned in the reducer oil chamber, and the second section protrudes into the transmission oil chamber, wherein a sealing element (5) is arranged between the reducer oil chamber and the transmission oil chamber, so that the reducer oil chamber and the transmission oil chamber are fluidically separated from each other. In order to improve operational safety, it is proposed to provide a channel (8, 9, 10) in the shaft, through which oil can be guided from the transmission oil chamber to the sealing element.

Description

Technical Field

[0001] The invention relates to a hydraulic retarder for a vehicle. Background Art

[0002] Such hydraulic retarders for vehicles, in particular commercial vehicles, are already sufficiently known from the general prior art. Different working media can be used here, such as oil or water. For example, oil is the working medium of a two-stage oil retarder. In contrast, a two-stage water retarder (SWR) uses cooling water from the vehicle's cooling system as the working medium.

[0003] The housing of the two-stage oil reducer surrounds the reducer oil chamber, in which the stator and the rotor rotatably supported by the drive shaft are arranged. The reducer is also intended to be mounted on a transmission with a transmission oil chamber. The drive is carried out via a step-up gear on the drive shaft, which is driven by a gear on the transmission side.

[0004] The requirements for the oil used in the reducer, such as its temperature resistance and viscosity, are relatively high, so lubricating oil cannot generally be used as the working medium. Therefore, the transmission oil chamber must be separated from the reducer oil chamber in a fluid-tight manner. For this purpose, a radial shaft sealing ring is provided, through which the drive shaft extends and the shaft is divided into two sections by the radial shaft sealing ring. In other words, one end of the reducer shaft extends into the reducer oil chamber, and the other end extends into the transmission oil chamber, and the two are separated in a fluid-tight manner.

[0005] There are various concepts for ensuring lubrication on both sides of the radial shaft sealing ring, wherein practice has shown that failures of the radial shaft sealing ring occur too frequently with the known concepts. Summary of the invention

[0006] The technical problem to be solved by the present invention is to improve the operational safety of the reducer.

[0007] According to the invention, this object is achieved by a hydrodynamic machine, in particular a hydrodynamic retarder.

[0008] According to the present invention, a reducer for mounting on a transmission is proposed, the reducer comprising a housing device and a shaft, the housing device enclosing a reducer oil chamber, the shaft having a first section and a second section, the rotor being arranged in a rotationally fixed manner on the first section, and the step-up gear being arranged in a rotationally fixed manner on the second section. The first section is positioned in the reducer oil chamber, and the second section protrudes into the transmission oil chamber, wherein a sealing element is arranged between the reducer oil chamber and the transmission oil chamber, so that the reducer oil chamber and the transmission oil chamber are separated from each other in terms of fluid.

[0009] In order to improve operational safety, it is proposed to provide a channel in the shaft, through which the oil can be conducted from the transmission oil chamber to the sealing element.

[0010] Furthermore, it is provided that a bearing is arranged on the shaft in the region of the second section, wherein the bearing is arranged on the shaft between the sealing element and the step-up gear. Preferably, the shaft is supported relative to the housing arrangement by means of the bearing. With this arrangement, the shaft is supported completely by the housing of the reducer, and a separate support in the transmission housing can be omitted.

[0011] Furthermore, the channel in the shaft can have at least one transverse channel, wherein the transverse channel is arranged between the bearing and the sealing element. Preferably, it can be provided that the transverse channel between the bearing and the sealing element ends in a channel outlet space, from which the oil subflow can be guided to the bearing and the sealing element. In this case, a guide element can be arranged in the channel outlet space, by means of which the distribution of the oil flow on the bearing and the sealing element can be adjusted as required.

[0012] It can also be provided that the channel includes a first channel section and a second channel section in addition to the transverse channel, wherein the first channel section and the transverse channel have a smaller cross section than the second channel section. Therefore, the second channel section can accommodate a larger oil volume for a certain degree of storage.

[0013] The sealing element can preferably be a radial shaft sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described based on embodiments with reference to the accompanying drawings. The accompanying drawings show in detail:

[0015] Figure 1 It is the connection area of ​​the reducer

[0016] Figure 2 is an enlarged view of the lubrication area. DETAILED DESCRIPTION

[0017] exist Figure 1 1 shows the connection area of ​​the reducer 1. The housing device 12 can be seen, wherein only a portion of the housing cover can be seen here, in which the bearing 4 and the radial shaft sealing ring 5 are arranged. The shaft 2 is supported relative to the housing device 12 or the housing cover via the bearing 4, wherein the bearing seat in the housing cover is designed to form a channel outlet space 15. The channels 8, 9, 10 through which the shaft 2 is guided and through which the oil is guided from the transmission oil chamber 6 to the lubrication point end in this channel outlet space 15.

[0018] The transmission oil chamber 6 is a chamber formed by a transmission housing (not shown here). The components of the transmission are arranged in this chamber and an oil lubrication device is provided, through which all the components of the transmission can be lubricated. In addition, a gear is arranged in the transmission oil chamber 6, which can mesh with the step-up gear 3 shown here to drive the shaft 2.

[0019] The reducer 1 is inserted into the transmission oil chamber 6 so that the second section 14, i.e., the gear section of the shaft 2, together with the step-up gear 3 and the bearing 4 arranged thereon, is connected to the transmission oil circuit and lubricated with the transmission oil. The connection with the lubricating oil circuit is designed in this case so that the lubricating oil is delivered to the channel outlet space 15 through the first channel section 4 (extending through the cover 16a in this embodiment), the second channel section 9 extending through the shaft 2, and the transverse hole 10. The guide device 11 is arranged in the channel outlet space 15, and the oil is guided to the radial shaft sealing ring 5 and the bearing 4 in a targeted manner through the guide device 11, thereby ensuring lubrication.

[0020] A first section 13 of the shaft 2 , ie the rotor section, begins behind the radial shaft sealing ring 5 and projects into the retarder oil chamber 7 , which is also only schematically shown in this figure.

[0021] Therefore, by means of this structure, the radial shaft sealing ring 5 is lubricated on the reducer oil chamber side 6 by the working medium of the reducer 1 and on the transmission oil chamber side 7 by the transmission oil.

[0022] exist Figure 2 An enlarged view of the lubrication area is shown in . Furthermore, the guide device 11 is here arranged in a manner different from that described above, so that the radial shaft sealing rings are lubricated first and the oil then reaches the bearings.

[0023] List of reference numerals:

[0024] 1 Reducer

[0025] 2 Axis

[0026] 3 Speed ​​increasing gear

[0027] 4 Bearings

[0028] 5 Shaft sealing ring

[0029] 6 Transmission oil chamber

[0030] 7 Reducer oil chamber

[0031] 8 First channel section

[0032] 9 Second channel section

[0033] 10 Horizontal channels

[0034] 11 Guidance Device

[0035] 12 Shell device

[0036] 13 first section, rotor section

[0037] 14 Second section, gear section

[0038] 15 channel exit space

[0039] 16 Cover

Claims

1. A hydraulic machine, the hydraulic machine being a hydraulic reducer (1), which is used to be mounted on a transmission device having a transmission oil chamber (6), the reducer comprising a housing device (12) and a shaft (2), the housing device surrounding the reducer oil chamber (7), the shaft having a first section (13) and a second section (14), the rotor being arranged in a rotationally fixed manner on the first section, and the step-up gear (3) being arranged in a rotationally fixed manner on the second section, in, The first section (13) protrudes into the reducer oil chamber (7), and the second section (14) protrudes into the transmission oil chamber (6), wherein a sealing element (5) is arranged between the reducer oil chamber (7) and the transmission oil chamber (6), so that the reducer oil chamber and the transmission oil chamber are fluidically separated from each other, characterized in that a channel is provided in the shaft (2), through which oil can be guided from the transmission oil chamber (6) to the sealing element (5).

2. A hydraulic machine according to claim 1, It is characterized in that A bearing (4) is arranged on the shaft (2) in the region of the second section (14).

3. A hydraulic machine according to claim 2, It is characterized in that The shaft (2) is supported relative to the housing device (12) by means of the bearing (4), wherein the bearing (4) is arranged on the shaft (2) between the sealing element (5) and the step-up gear (3).

4. A hydraulic machine according to claim 2, It is characterized in that The channel has at least one transverse channel (10), wherein the transverse channel (10) is arranged between the bearing (4) and the sealing element (5).

5. The hydraulic machine according to claim 2, It is characterized in that The transverse channel (10) between the bearing (4) and the sealing element (5) ends in a channel outlet space (15), from which a partial oil flow can be conducted to the bearing (4) and the sealing element (5).

6. A hydraulic machine according to claim 5, It is characterized in that A guide element (11) is arranged in the channel outlet space (15).

7. The hydraulic machine according to claim 4, It is characterized in that The channel comprises, in addition to the transverse channel (10), a first channel section (8) and a second channel section (9), wherein the first channel section (8) and the transverse channel (10) have a smaller cross section than the second channel section (9).

8. The hydraulic machine according to claim 1, It is characterized in that The sealing element (5) is a radial shaft sealing ring.

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