Cooling device for transmission test

Abstract

The utility model discloses a cooling device for a transmission test. The cooling device comprises a first heat exchanger, a water pump, a water return tank, a second heat exchanger and a heating tank. The water pump is used for pumping cooling liquid; the first heat exchanger is connected with the water pump through a pipeline, is used for receiving cooling liquid pumped by the water pump and carrying out first-stage cooling, and comprises a first liquid inlet pipe and a first liquid outlet pipe which are used for being communicated with a to-be-tested transmission; one end of the water return tank communicates with the first heat exchanger and is used for temporarily storing cooling liquid flowing out of the first heat exchanger. One end of the second heat exchanger communicates with the water return tank and is used for performing second-stage cooling on the cooling liquid flowing out of the water return tank; the heating tank is communicated between the water pump and the second heat exchanger and can be controlled to be opened or closed. Due to the fact that the heating tank and the second heat exchanger are arranged at the same time, the cooling device can adjust the temperature of the cooling liquid pumped into the first heat exchanger in real time according to the actual operation condition and the heat dissipation requirement of the transmission in the testing process, and flexibility is high.

Description

Technical Field

[0001] The utility model relates to the field of vehicle testing, in particular to a cooling device for testing a vehicle transmission. Background Art

[0002] The transmission is the core component of fuel vehicles. Its main function is to transmit engine power and change the transmission ratio so that the vehicle can output power smoothly under various working conditions, thereby running stably. Among them, AT transmission is widely used in the industry because of its good smoothness and ability to improve engine fuel economy. With the continuous development of the automobile industry, the number of gears of AT transmission has also changed, from the early 4AT and 6AT to today's 8AT, 9AT and even 10AT. Because of the increase in the number of gears, higher requirements are placed on the performance and reliability of the transmission, and the corresponding test requirements for AT transmission will become more stringent.

[0003] In the prior art, AT transmissions are usually tested on a dynamometer. During the test, due to the high gear speed and large torque load inside the transmission, the heat generated during operation usually causes the transmission oil temperature to rise rapidly. In order to be able to test normally, it is generally required to reasonably and effectively control the transmission oil temperature to prevent gear sintering damage due to high temperature. The current solutions to this problem in the industry mainly include: Method 1: Use a high-power hair dryer or environmental chamber to reduce the temperature of the transmission housing, thereby indirectly reducing the oil temperature. Method 2: Use coolant to perform oil-water heat exchange in the transmission.

[0004] Method 1 is suitable for small torque and low power transmission tests. However, for large torque transmission tests, the oil temperature will rise rapidly and the ability to reduce the oil temperature through the housing is limited. Therefore, method 1 cannot meet the requirements of large torque transmission tests. Method 2 can indeed quickly reduce the oil temperature. Due to the working characteristics of industrial chillers, they usually output a constant flow rate and a fixed temperature of coolant. However, in the actual test process, some AT transmission durability tests usually require the transmission oil temperature to change alternately to simulate different working environments. In this case, traditional industrial chillers with constant output cannot meet such test requirements well.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a cooling device for transmission testing, so as to solve the problem that the cooling device in the prior art cannot adapt to different testing environments.

[0007] To achieve the above-mentioned purpose, the utility model provides a cooling device for transmission testing, including a first heat exchanger, a water pump, a return water tank, a second heat exchanger and a heating tank. The water pump is used to pump coolant; the first heat exchanger is connected to the water pump through a pipeline, and is used to receive the coolant pumped by the water pump and perform the first stage cooling, and the first heat exchanger includes a first liquid inlet pipe and a first liquid outlet pipe for connecting to the transmission to be tested; one end of the return water tank is connected to the first heat exchanger, and is used to temporarily store the coolant flowing out of the first heat exchanger; one end of the second heat exchanger is connected to the return water tank, and is used to perform the second stage cooling on the coolant flowing out of the return water tank; the heating tank is connected between the water pump and the second heat exchanger, and can be controlled to be opened or closed.

[0008] In one or more embodiments, a first electronic proportional valve is disposed between the water pump and the first heat exchanger.

[0009] In one or more embodiments, a first flow meter and a first thermocouple are further provided between the water pump and the first heat exchanger.

[0010] In one or more embodiments, the second heat exchanger includes a second liquid inlet pipe and a second liquid outlet pipe for externally connecting cooling liquid.

[0011] In one or more embodiments, a second proportional valve is disposed on the second liquid inlet pipe.

[0012] In one or more embodiments, an overflow pipe is further connected between the water outlet of the water pump and the heating tank.

[0013] In one or more embodiments, a third electronic proportional valve is further disposed in the overflow pipe.

[0014] In one or more embodiments, the water return tank includes an expansion kettle for observing the coolant level, and / or the water return tank includes a one-way vent plug for exhausting air.

[0015] In one or more embodiments, the heating tank is provided with a drain port.

[0016] In one or more embodiments, the system further comprises a frame, on which the water pump, the return water tank, the second heat exchanger and the heating tank are supported.

[0017] Compared with the prior art, the cooling device for transmission testing of the utility model is provided with an independent heating tank and a second heat exchanger at the same time. Therefore, during testing, the cooling device can adjust the temperature of the coolant pumped into the first heat exchanger in real time according to the actual operating conditions and heat dissipation requirements of the transmission, and has high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1is a schematic diagram of a cooling device for transmission testing according to an embodiment of the present utility model;

[0019] Figure 2 is a top view of a cooling device for transmission testing according to an embodiment of the present utility model;

[0020] Figure 3 It is a front view of a cooling device for transmission testing according to an embodiment of the present utility model.

[0021] Description of main reference numerals:

[0022] 100-cooling device, 10-water pump, 20-first heat exchanger, 21-first liquid inlet pipe, 22-first liquid outlet pipe, 30-return water tank, 31-expansion kettle, 32-one-way vent plug, 40-second heat exchanger, 41-second liquid inlet pipe, 42-second liquid outlet pipe, 50-heating tank, 51-drain port, 61-electronic proportional valve, 62-flow meter, 63-thermocouple, 64-thermocouple, 65-overflow pipe, 66-electronic proportional valve, 67-electronic proportional valve, 70-transmission, 80-frame. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0024] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0025] like Figures 1 to 3 As shown, a cooling device 100 for transmission testing according to an embodiment of the present invention comprises a water pump 10, a first heat exchanger 20, a return water tank 30, a second heat exchanger 40 and a heating tank 50 which are sequentially connected through pipelines. A first liquid inlet pipe 21 and a first liquid outlet pipe 22 are provided on the first heat exchanger 20 for externally connecting to a transmission 70.

[0026] Specifically, the water pump 10 is used to pump the coolant into the first heat exchanger 20. The transmission 70 to be tested is located outside the first heat exchanger 20. The transmission oil returns to the transmission after completing heat exchange with the coolant in the first heat exchanger 20 (first stage cooling, used to cool the transmission oil). After completing heat exchange in the first heat exchanger 20, the coolant flows to the return water tank 30 and is temporarily stored. Then, the coolant completes the second heat exchange in the second heat exchanger 40 (second stage cooling, used to cool the coolant). After being cooled, the coolant flows into the heating tank 50. The heating tank 50 can be controlled to be closed or opened to further adjust the temperature of the internal coolant. Then, the coolant waits to be pumped into the first heat exchanger 20.

[0027] The cooling device 100 in this embodiment is provided with a second heat exchanger 40 and a heating tank 50. When the temperature of the coolant pumped into the first heat exchanger 20 needs to be increased, the heating tank 50 can be started to heat the coolant, and the second heat exchanger 40 can be turned off or its cooling efficiency can be reduced; and when the temperature of the coolant pumped into the first heat exchanger 20 needs to be reduced, the heating tank 50 can be turned off and the cooling efficiency of the second heat exchanger 40 can be increased. Therefore, during testing, the temperature of the coolant pumped into the first heat exchanger 20 can be adjusted in real time according to the actual operation of the transmission and the heat dissipation requirements, with high flexibility.

[0028] Preferably, an electronic proportional valve 61 is provided in the pipeline connecting the water pump 10 and the first heat exchanger 20. The flow rate of the coolant pumped into the first heat exchanger 20 can be controlled by adjusting the electronic proportional valve 61, thereby regulating the heat exchange effect in the first heat exchanger 20, which is more flexible.

[0029] Furthermore, a flow meter 62 and a thermocouple 63 are provided in the pipeline connecting the water pump 10 and the first heat exchanger 20 for real-time monitoring of the flow rate and temperature of the coolant pumped into the first heat exchanger 20 .

[0030] It is easy to imagine that a thermocouple 64 can be provided on the first liquid inlet pipe 21 to monitor the temperature of the transmission oil flowing into the first heat exchanger 20. Of course, a thermocouple (not shown) can also be provided on the first liquid outlet pipe 22. By providing two thermocouples, the temperature of the transmission oil flowing into / out of the transmission 70 can be monitored in real time to evaluate whether the cooling effect at this time meets the test requirements. If the test requirements are not met, the temperature and flow rate of the pumped coolant can be controlled to meet the test requirements by adjusting the second heat exchanger 40, the heating tank 50 or the electronic proportional valve 61.

[0031] Preferably, an oil overflow circuit is further provided between the water pump 10 and the heating tank 50, which can be realized by an overflow pipe 65, one end of which is connected to the pipeline between the water pump 10 and the first heat exchanger 20, and the other end is connected to the heating tank 50. When the coolant flow rate pumped out by the water pump 10 is greater than the coolant flow rate required by the first heat exchanger 20 at this time, the excess coolant flows back to the heating tank 50 through the overflow circuit to prevent the water pump 10 from being blocked and burned.

[0032] Furthermore, an electronic proportional valve 66 is also provided in the overflow circuit to control the overflow amount. Since the electronic proportional valve is provided in the water pump 10, the first heat exchanger 20 and the overflow circuit at the same time, the flow of the coolant can be controlled at the same time, which greatly improves the accuracy of the flow and temperature control.

[0033] After the coolant moves to the return water tank 30, preferably, the overall liquid level of the coolant can be observed through an expansion kettle 31 provided on the return water tank 30. In addition, a one-way vent plug 32 is also provided on the return water tank 30, which is connected to the return water tank 30 and is used to evacuate excess air in the pipeline.

[0034] The coolant flows out of the return water tank 30 and then flows into the second heat exchanger 40. In order to make the heat exchange process in the second heat exchanger 40 controllable, the second heat exchanger 40 is also provided with two loops, one of which is connected between the return water tank 30 and the heating tank 50, and the other includes a second liquid inlet pipe 41 and a second liquid outlet pipe 42. The external additional coolant flows into the second heat exchanger 40 through the second liquid inlet pipe 41, and after completing the heat exchange with the existing coolant in the cooling loop, it flows out through the second liquid outlet pipe 42. The temperature of the coolant in the loop is reduced and flows into the heating tank 50.

[0035] Preferably, an electronic proportional valve 67 is provided on the second liquid inlet pipe 41 for controlling the flow rate of the external coolant flowing into the second heat exchanger 40 to control the temperature of the coolant in the loop to meet the test requirements.

[0036] After the coolant flows into the heating tank 50, if the temperature needs to be increased, the heating tank 50 is started. On the contrary, if the temperature does not need to be increased, the heating tank 50 is not started.

[0037] Preferably, the heating tank 50 includes a drain port 51 for draining the liquid. After draining the coolant, a cleaning liquid can be added through the expansion kettle 31 to clean the pipeline. At the same time, a heater 52 is provided on the heating tank 50 for heating the coolant in the heating tank 50.

[0038] like Figure 1-3As shown, the cooling device 100 also includes a frame 80. The water pump 10, the return water tank 30, the second heat exchanger 40 and the heating tank 50 are fixed on the frame 80, which is convenient for the staff to operate. Further, the return water tank 30, the second heat exchanger 40 and the heating tank 50 are fixed on the columns of the frame 80 from top to bottom, and the water pump 10 is fixed on the supporting bottom plate of the frame 80, thereby meeting the layout requirements, reducing the pipeline wiring, and reducing the wiring difficulty and manufacturing cost.

[0039] Of course, the first heat exchanger 20 may also be fixed on the supporting bottom plate of the frame 80. In this case, the cooling device 100 becomes an integral whole. It is only necessary to connect the transmission 70 to be tested to the first heat exchanger 20, which is more convenient for the staff to operate.

[0040] The cooling device 100 provided by the present invention is further described below in conjunction with specific usage scenarios.

[0041] When the transmission needs to be tested, the transmission 70 to be tested is moved to the vicinity of the first heat exchanger 20 and connected to it through the first liquid inlet pipe 21 and the first liquid outlet pipe 22. Then the water pump 10 is turned on, the transmission 70 to be tested is operated, and the test begins. During the test, the coolant continues to flow in the circuit and generates heat exchange with the transmission oil in the first heat exchanger 20. If the transmission oil temperature monitored by the thermocouple 64 is higher than the expected temperature, the heater 52 will be disconnected from the power supply and stop heating, and the electronic proportional valve 67 will increase the valve opening to increase the flow of external coolant, and reduce the temperature of the coolant in the circuit through the second heat exchanger 40, thereby reducing the transmission oil temperature until the expected temperature is reached. If the transmission oil temperature is lower than the expected temperature, the heater 52 is powered on to start heating, and the electronic proportional valve 67 reduces the valve opening or even closes to reduce the heat exchange of the coolant in the circuit. At this time, the coolant will continue to heat up, and the coolant heats the transmission oil through the first heat exchanger 20 until the transmission oil temperature reaches the expected temperature.

[0042] Compared with traditional cooling equipment, the cooling device 100 in this embodiment can control the flow rate and temperature of the coolant at the same time. In addition to dissipating the heat of the coolant in the circuit, it can also heat it. The theoretical oil temperature control range of the cooling device 100 is 25°C-110°C, which has a larger control range and can simulate more actual usage conditions, greatly increasing flexibility.

[0043] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A cooling device for transmission testing, characterized in that: Including those connected in sequence through pipelines: A water pump for pumping coolant; A first heat exchanger, connected to the water pump through a pipeline, for receiving the coolant pumped by the water pump and performing a first stage of cooling, the first heat exchanger comprising a first liquid inlet pipe and a first liquid outlet pipe, the first liquid inlet pipe and the first liquid outlet pipe being connected to the transmission to be tested; A return water tank, one end of which is connected to the first heat exchanger, and the return water tank is used to temporarily store the coolant flowing out of the first heat exchanger; A second heat exchanger, one end of which is connected to the return water tank, for performing a second stage of cooling on the coolant flowing out of the return water tank; as well as The heating tank is connected between the water pump and the second heat exchanger, and the heating tank can be controlled to be turned on or off.

2. The cooling device for transmission testing according to claim 1, characterized in that: A first electronic proportional valve is arranged between the water pump and the first heat exchanger.

3. The cooling device for transmission testing according to claim 1, characterized in that: A first flow meter and a first thermocouple are also arranged between the water pump and the first heat exchanger.

4. The cooling device for transmission testing according to claim 1, characterized in that: The second heat exchanger includes a second liquid inlet pipe and a second liquid outlet pipe for externally connecting cooling liquid.

5. The cooling device for transmission testing according to claim 4, characterized in that: The second liquid inlet pipe is provided with a second proportional valve.

6. The cooling device for transmission testing according to claim 1, characterized in that: An overflow pipe is also connected between the water outlet of the water pump and the heating tank.

7. The cooling device for transmission testing according to claim 6, characterized in that: A third electronic proportional valve is also arranged in the overflow pipe.

8. The cooling device for transmission testing according to claim 1, characterized in that: The water return tank includes an expansion kettle for observing the coolant level, and / or the water return tank includes a one-way vent plug for exhausting air.

9. The cooling device for transmission testing according to claim 1, characterized in that: The heating tank is provided with a liquid discharge port.

10. The cooling device for transmission testing according to claim 1, characterized in that: It also includes a frame, on which the water pump, the return water tank, the second heat exchanger and the heating tank are supported.

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