Self-heating system for transmission and transmission

Abstract

The present invention discloses a self-heating system for a transmission and a transmission, wherein the self-heating system is arranged outside the housing of the transmission (1), the self-heating system has a coolant chamber (4) for introducing coolant, a reaction chamber (3) for performing an exothermic reaction and a heat-conducting layer (2) for transferring heat to the transmission (1), and in order to heat the transmission, the self-heating system also has a storage device (8), in which reactants are stored, the reactants can perform an exothermic reaction with the coolant in the reaction chamber (3), and the heat generated by the exothermic reaction is transferred to the transmission (1) through the heat-conducting layer (2).

Description

Technical Field

[0001] The present invention relates to a self-heating system for a transmission, which is particularly used for a transmission of a hybrid vehicle or a pure electric vehicle. The present invention also relates to a transmission with a corresponding self-heating system, which is particularly used in a hybrid vehicle or a pure electric vehicle. Background Art

[0002] The transmission in the prior art usually has a large amount of lubricating oil, and the optimal operating temperature of the lubricating oil is between 80° and 90°. However, when the vehicle is initially started without warming up, especially when the vehicle is cold started in cold areas, the transmission needs time to warm up to reach the ideal operating temperature. The warm-up time of vehicles started by electric motors or pure electric vehicles will be relatively long, and it is even difficult to make the transmission reach the desired operating temperature in a short time. Therefore, the transmission needs to be heated.

[0003] US20090036268 A1 discloses a system and method for heating a transmission, wherein the transmission has at least one solenoid valve and at least one actuating device for actuating the solenoid valve. First, a sensor is used to determine whether the temperature of the transmission is greater than or equal to a desired operating temperature, and a currently selected transmission ratio of the transmission is determined. When the transmission has not reached the desired operating temperature and over-exciting the solenoid valve for the currently selected transmission ratio will not interfere with the operation of the transmission, the solenoid valve is over-excited.

[0004] However, such a system and method for heating the transmission is relatively complex and costly. In addition, the solenoid valve can easily interfere with the electronic operating device of the transmission and cannot quickly enable the transmission to reach a desired operating temperature in a short period of time. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide an improved heating system for a transmission, which has a simple structure and low cost and can enable the transmission to reach an ideal operating temperature in a very short time when in use.

[0006] The technical problem is solved by a self-heating system for a transmission, wherein the self-heating system is arranged outside the housing of the transmission, and the self-heating system has a coolant chamber for introducing coolant, a reaction chamber and a heat-conducting layer for transferring heat to the transmission, wherein the self-heating system also has a storage device, in which reactants are stored, and the reactants can react with the coolant in the reaction chamber to exothermically react, and the heat generated by the reaction is transferred to the transmission through the heat-conducting layer. The self-heating system designed according to the present invention has a simple structure and does not use expensive parts. It can transfer a large amount of heat energy to the transmission in a very short time by using chemical reaction heat release, so that the transmission can be quickly heated.

[0007] According to a preferred embodiment of the present invention, the coolant in the coolant chamber is water, and the reactant stored in the storage device is calcium monoxide, so that water and calcium monoxide react chemically in the reaction chamber and release a large amount of heat energy.

[0008] According to another preferred embodiment of the present invention, the transmission according to the present invention is applied in a hybrid vehicle or a pure electric vehicle, the transmission is connected to the electric motor, the coolant chamber of the self-heating system is connected to the cooling system of the electric motor, and the coolant in the existing cooling system, especially the cooling water, is reacted with the reactants in the storage device, thereby saving parts and reducing costs.

[0009] According to another preferred embodiment of the present invention, the reaction chamber is provided with a first inlet, a second inlet and an outlet, wherein the first inlet is connected to the coolant chamber through a first flow valve, the second inlet is connected to the storage device through a one-way supply pump, and the outlet is provided with a second flow valve. Therefore, the coolant flows into the reaction chamber through the first inlet when the first flow valve is opened, and the reactant flows into the reaction chamber through the second inlet when the one-way supply pump is opened, and reacts with the coolant in the reaction chamber. When the transmission reaches the ideal operating temperature, the first flow valve and the one-way supply pump are closed, and the second flow valve is opened so that hot air can flow out of the reaction chamber through the outlet, thereby avoiding overheating of the transmission. Preferably, the second flow valve is connected to the vacuum chamber, so that the hot air and the reaction product in the reaction chamber can be introduced into the vacuum chamber when the second flow valve is opened, so as to avoid the transmission from being further heated. Advantageously, the vacuum chamber is connected to a pressure pump, which can discharge the gas in the vacuum chamber, especially to the external environment, thereby reducing the pressure in the vacuum chamber.

[0010] According to another preferred embodiment of the present invention, the self-heating system is provided with a temperature sensor for measuring the temperature of the lubricating oil of the transmission, so as to control the self-heating system according to the temperature of the lubricating oil of the transmission. Preferably, the temperature sensor is installed on the transmission, and in particular, the temperature sensor is integrated on the oil drain bolt of the transmission, so as to save space and make full use of existing components. Advantageously, the temperature sensor can control the switch of the first flow valve, the second flow valve and the one-way supply pump through a signal, and in particular, control the switch according to the temperature of the lubricating oil. When the transmission needs to be heated, the first flow valve and the one-way supply pump are opened and the second flow valve is closed; after the transmission reaches the ideal operating temperature, the first flow valve and the one-way supply pump are closed and the second flow valve is opened.

[0011] The object of the invention is also achieved by a transmission for hybrid vehicles and pure electric vehicles, wherein the transmission has a self-heating system according to the above-described design. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A structural schematic diagram of a self-heating system according to the present invention is shown.

[0013] The same reference numerals are used for components that are identical or have similar functions. DETAILED DESCRIPTION

[0014] As shown in the figure, the self-heating system according to the present invention is arranged outside the housing of the transmission 1. The transmission 1 is used in a hybrid drive vehicle or a pure electric drive vehicle, and the transmission 1 is connected to the motor 11. The self-heating system according to the present invention has a heat-conducting layer 2, a reaction chamber 3, and a coolant chamber 4. The coolant chamber 4 is connected to the cooling system 12 of the motor 11, and can introduce coolant, especially water, from the cooling system 12 and store the coolant in the coolant chamber 4; a reaction chamber 3 is arranged between the coolant chamber 4 and the heat-conducting layer 2, and an exothermic chemical reaction is carried out in the reaction chamber 3, and the heat is transferred to the heat-conducting layer 2; the heat-conducting layer 2 is arranged between the reaction chamber 3 and the housing of the transmission 1, and the heat-conducting layer 2 is made of ceramic plastic, so the heat-conducting layer 2 can conduct heat better and has less thermal deformation.

[0015] The self-heating system according to the present invention also has a temperature sensor 5, two flow valves 9 and a storage device 8. The reaction chamber 3 has two inlets and one outlet, wherein the storage device 8 is connected to the first inlet of the reaction chamber 3 through a one-way supply pump 10, the coolant chamber 4 is connected to the second inlet of the reaction chamber 3 through the first flow valve 9, and the reaction chamber 3 is connected to the vacuum chamber 6 provided outside through the second flow valve 9. Calcium monoxide (CaO) is stored in the storage device 8, and can be provided to the reaction chamber 3 through the one-way supply pump 10. At the same time, the coolant chamber 4 inputs water to the reaction chamber 3 through the first flow valve 9, so that a chemical reaction represented by equation (1) occurs in the reaction chamber 3, and a large amount of heat is released. This heat is transferred to the transmission housing 1 through the heat conductive layer 2, so that the transmission 1 is heated.

[0016] CaO+H2O→Ca(OH)2+Q(1)

[0017] The temperature sensor 5 is connected to the first and second flow valves 9 and the one-way supply pump 10, and can control the switch of the first and second flow valves 9 and the one-way supply pump 10 through signals. The temperature sensor 5 is fixed to the transmission 1 through the drain bolt, and can measure the temperature of the lubricating oil of the transmission 1, and control the switch of the first flow valve 9 and the one-way supply pump 10 according to the temperature of the lubricating oil of the transmission 1: when the temperature of the lubricating oil is low, the first flow valve 9 and the one-way supply pump 10 are opened, so that the cooling water and calcium monoxide perform an exothermic chemical reaction in the reaction chamber 3; when the temperature of the lubricating oil reaches the requirement, the one-way supply pump 10 and the first flow valve 9 are closed, and the second flow valve 9 is opened at the same time, so that the remaining hot air flows from the reaction chamber 3 into the vacuum chamber 6 to stop heating the transmission housing. The vacuum chamber 6 can discharge the air in it to the external environment through the pressure pump 7 to reduce the pressure in the vacuum chamber 6.

[0018] Although possible embodiments are described by way of example in the above description, it should be understood that there are still a large number of variations of embodiments through the combination of all known and other technical features and embodiments that are easily conceivable to the skilled person. It should also be understood that the exemplary embodiment is only an example and that such an embodiment in no way limits the scope of protection, application and configuration of the present invention. The above description is more to provide the skilled person with a technical guide for converting at least one exemplary embodiment, wherein various changes can be made, especially changes in the functions and structures of the components, as long as they do not depart from the scope of protection of the claims.

[0019] Reference numerals list

[0020] 1 Transmission

[0021] 2 Thermal Conductive Layer

[0022] 3 Reaction chamber

[0023] 4 Coolant chamber

[0024] 5. Temperature Sensor

[0025] 6 Vacuum Chamber

[0026] 7. Pressure pump

[0027] 8 Storage Devices

[0028] 9 First flow valve

[0029] 10 One-way supply pump

[0030] 11 Electric Motor

[0031] 12 Cooling System

Claims

1. A self-heating system for a transmission (1), wherein: The self-heating system is arranged outside the housing of the transmission (1), and comprises a coolant chamber (4) for introducing coolant from a cooling system (12), a reaction chamber (3) for performing an exothermic reaction, and a heat conducting layer (2) for conducting heat to the transmission (1). The self-heating system is characterized in that the self-heating system further comprises a storage device (8) in which reactants are stored. The storage device (8) is connected to the reaction chamber (3) via a one-way supply pump (10) and is configured to supply the reactants to the reaction chamber (3) via the one-way supply pump (10) according to the lubricating oil temperature of the transmission (1), so that the reactants can react with the coolant in the reaction chamber (3) in an exothermic reaction, and the heat generated by the exothermic reaction is transferred to the transmission (1) via the heat conductive layer (2).

2. The self-heating system according to claim 1, characterized in that: The coolant is water, and the reactant is calcium monoxide.

3. The self-heating system according to claim 1, characterized in that: The transmission (1) is used in a hybrid vehicle or a pure electric vehicle, and the coolant chamber (4) is connected to the cooling system (12) of the electric motor (11) of the hybrid vehicle or the pure electric vehicle.

4. The self-heating system according to claim 1, characterized in that: The reaction chamber (3) is provided with a first inlet, a second inlet and an outlet, wherein the first inlet is connected to the cooling liquid chamber (4) via a first flow valve, the second inlet is connected to the storage device (8) via the one-way supply pump (10), and a second flow valve is provided at the outlet.

5. The self-heating system according to claim 4, characterized in that: The second flow valve is connected to the vacuum chamber (6).

6. The self-heating system according to claim 5, characterized in that: The vacuum chamber (6) is connected to a pressure pump (7), and the pressure pump is capable of discharging the gas in the vacuum chamber (6).

7. The self-heating system according to claim 4, characterized in that: The self-heating system is provided with a temperature sensor (5) for measuring the temperature of the lubricating oil of the transmission (1).

8. The self-heating system according to claim 7, characterized in that: The temperature sensor (5) can control the switching of the first flow valve, the second flow valve and the one-way supply pump (10) through signals.

9. The self-heating system according to claim 7 or 8, characterized in that: The temperature sensor (5) is integrated on the oil drain plug of the transmission.

10. A transmission (1) for a hybrid vehicle or a pure electric vehicle, characterized in that: The transmission (1) has a self-heating system according to any one of claims 1 to 9.

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