Hydrodynamic retarder

Abstract

A kind of retarder for motor vehicle, it has the retarder housing, the retarder housing is made of rotor housing component, stator housing component and housing cover, wherein, internal passage extends in the retarder housing, the passage is attributed to working medium circulation loop or cooling water circulation loop, the retarder further has heat exchanger, wherein, coupling plane is provided on the retarder housing, working medium circulation loop can be connected with the primary side of heat exchanger by the coupling plane fluidly, cooling water circulation loop can be connected with the secondary side of heat exchanger by the coupling plane fluidly, wherein, hose joint is arranged on stator housing component, the hose joint respectively constitutes the partial passage section of cooling water circulation loop.According to the utility model, sensor is provided at the retarder, temperature in cooling water circulation loop can be measured by the sensor.

Description

Technical Field

[0001] This utility model relates to a hydraulic retarder, which has a device for detecting the temperature of cooling water. Background Technology

[0002] Hydraulic retarders are commonly known as wear-free, continuous braking devices, for example, in motor vehicles, especially commercial vehicles or rail vehicles. A hydraulic retarder comprises a working medium circulation loop and a cooling water circulation loop. Oil is typically used in the working medium circulation loop, but water or a water mixture can also be used. If oil is used as the working medium, a heat exchanger is employed, through which the working medium circulation loop and the cooling water circulation loop are guided in opposite directions.

[0003] During braking, the braking torque is typically adjusted according to different conditions. Furthermore, the braking torque also depends on the temperature of the working or cooling medium, as the heat generated during braking must be dissipated through this medium, particularly cooling water. If the temperature is too high, the braking power must be reduced.

[0004] To monitor temperature, the temperature at different locations in the working medium circulation loop and / or cooling water circulation loop can be considered. For example, the working medium temperature and / or cooling water temperature in the retarder's outlet channel can be measured.

[0005] Such retarders are known, for example, from DE10 2010 010 222 A1 or DE 10 2015 205 851 A1. To enable monitoring of the retarder during operation, a temperature sensor is used. To improve the functionality of the retarder, the sensor is positioned in the working space or a volumetric area used for inputting or outputting the working medium and / or cooling water. Furthermore, the sensor may be thermally connected to adjacent components.

[0006] The heat exchanger is typically screwed onto the retarder via a screwing surface or coupling plane. An oil passage is arranged in the coupling plane, which is part of the working medium circulation loop and fluidly connects the retarder to the heat exchanger.

[0007] As the requirements for retarders have increased, other retarder structures have been developed and temperature sensor arrangement structures have been tested. Utility Model Content

[0008] The technical problem to be solved by this invention is to propose a sensor position for optimizing a retarder, thereby improving the functionality of the retarder.

[0009] The technical problem is solved by a retarder for motor vehicles.

[0010] A retarder for a motor vehicle is proposed. The retarder has a retarder housing, which is composed of a rotor housing component, a stator housing component, and a housing cover. Multiple internal channels extend within the retarder housing and are associated with either a working medium circulation loop or a cooling water circulation loop. The retarder also has a heat exchanger. A coupling plane is provided on the retarder housing, through which the working medium circulation loop can be fluidly connected to the primary side of the heat exchanger, and the cooling water circulation loop can be fluidly connected to the secondary side of the heat exchanger through the coupling plane. Hose connectors are arranged on the stator housing component, each forming a partial channel section of the cooling water circulation loop.

[0011] According to the present invention, a sensor is installed on the retarder, which can measure the temperature in the cooling water circulation loop.

[0012] In one embodiment, the sensor can be arranged in the channel section of the cooling water circulation loop between the outlet of the heat exchanger and the outlet of the hose connector.

[0013] In addition, the sensor can be coupled to a hose connector, for example, by screwing or other fixing methods.

[0014] Specifically, the sensor is designed to extend tangentially into the cooling water circulation loop with its measuring tip tangential to the flow channel diameter. This positions the sensor laterally within the outlet flow channel, reducing hydraulic resistance caused by the sensor tip and thus minimizing pressure loss within the channel.

[0015] The main advantage of this sensor arrangement is that it can shorten the response time to temperature changes, thereby reducing pressure loss in the cooling circuit. Attached Figure Description

[0016] The present invention will now be described with reference to the accompanying drawings. Specifically, as shown in the drawings:

[0017] Figure 1 A cross-sectional view of the retarder is shown.

[0018] Figure 2 A schematic diagram with a sensor is shown. Detailed Implementation

[0019] Figure 1 The retarder 1 according to the present invention is shown in cross-sectional view, so that the paths of the forward and return channels 10a and b through the stator housing component 5 and the housing cover 6 can be clearly seen. The heat exchanger 7 is fixed to the housing cover 6 of the retarder 1.

[0020] The retarder housing 3 is composed of a rotor housing component 4, a stator housing component 5, and a housing cover 6. A rotor 15, which can be driven by gears 18, is integrated into the retarder housing 3, and a torsionally fixed stator 16 is integrated into the stator housing component. The working medium circulation loop (oil loop) includes oil passages, such as oil passage 18, and an oil container 13, in which oil is stored during non-braking operation. The overall structure and function of the working medium circulation loop are known from the prior art and will not be described in detail here.

[0021] A coupling plane 8 is provided on the housing cover 6 of the retarder housing 3. The primary side of the heat exchanger can be fluidly connected to the oil passage of the working medium circulation loop through this coupling plane. It is not shown in detail here because the connection between the primary circuit of the heat exchanger and the working medium circulation loop is prior art. The secondary side of the heat exchanger shown is also fluidly connected to the forward passage 10a and / or the return passage 10b through the coupling plane 8.

[0022] To establish a fluid-conducting connection, the heat exchanger 7 is fixed to the coupling plane 8 of the housing cover 6 via a threaded connection, thereby aligning or matching the corresponding channels in the housing cover 6 and the heat exchanger 7. Sealing elements, such as O-rings, can be used for sealing.

[0023] The forward passage 10a and the return passage 10b extend through the retarder housing 3 or through the stator housing component 5 and the housing cover 6, and are cast into these components. Alternatively, pipe sections can be provided within the housing. Connecting planes 11a and 11b are provided on the stator housing component 5, and hose connectors 9 are threadedly fixed to these coupling planes, thereby enabling the forward passage and return passages 10a and 11b to connect to the vehicle's cooling circuit, in which cooling water can be guided through a radiator on the vehicle side (not shown).

[0024] The connecting planes 11a and 11b are arranged parallel to the coupling plane 8, thereby enabling connection to the vehicle's cooling circuit via a hose, without having to guide the hose past the retarder housing.

[0025] Sensor 2 is positioned at the heat exchanger outlet to detect temperature changes and their absolute values. This improves the monitoring of the cooling medium temperature and allows for reliable adjustment of the retarder power when limits are exceeded.

[0026] The oil temperature sensor, not shown, is arranged to measure the oil temperature in the working space 17. Its specific location can be derived, for example, from DE10 2021 117 381 A1. The greater distance between the sensors also provides the advantage of eliminating the risk of sensor confusion when connecting them.

[0027] Figure 2A view showing the arrangement of sensor 2 in hose connector 9b is provided. Sensor 2 extends tangentially to the cooling water circulation loop with its measuring tip 20 tangential to the flow channel diameter. The orientation of the housing wall of stator housing component 5 is shown. Sensor 2 is also arranged such that it has the greatest possible distance from oil container 13, thereby minimizing the influence of oil temperature on the cooling water temperature at sensor head 21.

[0028] List of reference numerals

[0029] 1. Retarder

[0030] 2 Sensors

[0031] 3. Retarder housing

[0032] 4 Rotor housing components

[0033] 5. Stator housing components

[0034] 6. Housing cover

[0035] 7. Heat Exchanger

[0036] 8 Coupled Planes

[0037] 9a, b Hose connectors

[0038] 10a Forward Passage

[0039] 10b Return Channel

[0040] 11a, b Connecting planes

[0041] 12 Control equipment

[0042] 13 Oil containers

[0043] 14 Cooling surfaces

[0044] 15 Rotors

[0045] 16 stators

[0046] 17 Workspace

[0047] 18 gears

[0048] 19 Oil Channel

[0049] 20. Measuring tip.

Claims

1. A retarder (1) for a motor vehicle, the retarder having a retarder housing (3), the retarder housing being composed of a rotor housing component (4), a stator housing component (5), and a housing cover (6), wherein, Multiple channels located inside extend within the retarder housing. These channels are associated with either a working medium circulation loop or a cooling water circulation loop. The retarder also has a heat exchanger (7). A coupling plane (8) is provided on the retarder housing (3). The working medium circulation loop can be connected to the primary side of the heat exchanger (7) via the coupling plane, and the cooling water circulation loop can be connected to the secondary side of the heat exchanger (7) via the coupling plane. Hose connectors (9a, b) are arranged on the stator housing component (5). These hose connectors respectively constitute part of the channel sections of the cooling water circulation loop. The retarder is characterized by having a sensor (2) installed thereon, which can measure the temperature in the cooling water circulation loop.

2. The retarder (1) according to claim 1, characterized in that, The sensor (2) is arranged in the channel section of the cooling water circulation loop between the outlet of the heat exchanger and the outlet of the hose connector (9a).

3. The retarder (1) according to claim 1, characterized in that, The sensor (2) is coupled to the hose connector (9b).

4. The retarder (1) according to claim 1, characterized in that, The sensor (2) extends into the cooling water circulation loop with its measuring tip (20) tangential to the diameter of the flow channel.

5. The retarder (1) according to claim 1, characterized in that, The sensor (2) can be screwed into the hose connector (9b).

Images