JP4992290B2 - Transmission - Google Patents

Description

  The present invention relates to a transmission mounted on a vehicle such as an automobile, and more particularly to a transmission that operates while circulating a working fluid.

In order to warm up the automatic transmission at an early stage after the engine is started, an apparatus for heating a working fluid (hereinafter referred to as ATF) of the automatic transmission is known (for example, see Patent Documents 1 to 3). Patent Document 1 discloses an ATF warmer that heats ATF by heat exchange with engine coolant. In Patent Document 2, a heat storage tank filled with a latent heat storage material is disposed in a bypass pipe that bypasses the radiator in the circulation path of the ATF, and when the ATF cooling capacity by the radiator is low, heat is stored from the ATF to the heat storage material, A technique for dissipating heat from a heat storage material to an ATF when the heating ability of the ATF by a radiator is low is disclosed. Patent Document 3 discloses a technique similar to a structure in which a heater is provided instead of the latent heat storage material having the structure of Patent Document 2, and a technique for operating the heater when heat for warm-up is insufficient. Yes.
JP 2005-299767 A JP 2002-39339 A JP 2002-149244 A

  However, in the configuration of Patent Document 1, since the automatic transmission is warmed up using waste heat of the engine after waiting for the engine to be warmed up, there is a problem that the immediate effect is low. In the configurations of Patent Literature 2 and Patent Literature 3, since the heat storage tank is disposed in the bypass pipe, the structure is complicated, such as requiring a plurality of switching valves. Moreover, in the structure of patent document 2, if the stored latent-heat storage material is left in a low temperature environment, it will thermally radiate and may not contribute to warming-up promotion. On the other hand, in the configuration described in Patent Document 3, since external energy is used for the operation of the heater, the warming-up promotion effect is offset and the fuel consumption may not be improved.

  In view of the above facts, an object of the present invention is to obtain a transmission that can reduce the temperature fluctuation range of a working working fluid with a simple structure.

In order to achieve the above object, the transmission according to the first aspect of the present invention may cause a phase transition in a portion where the working fluid always flows in a circulation path through which the working fluid circulates by heat exchange with the working fluid. A transmission having a heat storage body configured to include a latent heat storage material , wherein the heat storage body includes a first latent heat storage material having a melting point higher than a minimum temperature of the working fluid in an operation state, and an operation And a second latent heat storage material having a melting point lower than the minimum temperature of the working fluid in a state and easily causing supercooling, and suppressing overcooling for suppressing overcooling of the first latent heat storage material And a supercooling release means for canceling the supercooling of the second latent heat storage material .

  In the transmission according to claim 1, in the operating state, the working fluid that constantly circulates in the circulation path (acts so as to perform a predetermined function) always exchanges heat with the heat storage body provided in the circulation path. Do. As a result, when the working fluid temperature is higher than the phase transition temperature of the latent heat storage material constituting the heat storage body, the latent heat storage material of the heat storage body absorbs the latent heat accompanying the phase transition from the working fluid. Reduce the temperature. In addition, when the working fluid temperature is lower than the phase transition temperature of the latent heat storage material constituting the heat storage body, the temperature of the working fluid is increased by the radiation of latent heat accompanying the phase transition from the latent heat storage material that has absorbed heat as described above. be able to.

  Thus, in the transmission according to the first aspect, the temperature fluctuation range of the working fluid to be operated can be reduced with a simple structure. In addition, a heat storage body may be comprised only with a latent heat storage material, and may be comprised including the container etc. which enclose a latent heat storage material.

Further, in this transmission, after starting, the working fluid is heated to a temperature equal to or higher than the lowest temperature in the operating state (for example, a set value between 70 ° C. and 80 ° C.), and enters the normal operating state. Among the constituent materials of the heat storage body, the temperature of the first latent heat storage material having a melting point exceeding the above minimum temperature can be increased or decreased with the melting point interposed therebetween in a normal operation state. For this reason, the first latent heat storage material melts (liquefies) when the temperature rises above its melting point and absorbs heat (storage) from the working fluid, and solidifies (solidifies) when the temperature falls below the melting point. ) To generate heat (heat radiation).

  Thereby, in this transmission, the temperature fluctuation width of the working fluid in the normal operation state can be reduced by the phase transition between the liquid phase and the solid phase of the first latent heat storage material included in the heat storage body.

  On the other hand, among the constituent materials of the heat storage body, the second latent heat storage material having a melting point lower than the minimum temperature is always melted (liquefied) into a heat absorption (heat storage) state in a normal operation state. When the working fluid temperature decreases after the operation of the transmission, the second latent heat storage material does not solidify (solidify) and falls in a supercooled state. That is, the second latent heat storage material is held in a state in which latent heat is stored in a supercooled state. When the supercooling release means is operated when the transmission is restarted, the second latent heat storage material is solidified to dissipate the solidified heat, and the working fluid is heated by this heat.

  Thereby, in this transmission, the working fluid after start-up can be heated by the phase transition from the supercooled state (liquid phase) to the solid phase of the second latent heat storage material. Accordingly, it is possible to promote warm-up by increasing the lower limit of the temperature fluctuation range of the working fluid at the time of operating the transmission and operating the supercooling release means immediately after starting.

  In addition, as a configuration in which supercooling is likely to occur, for example, in addition to selection of the constituent material itself of the heat storage body, a configuration having a low surface roughness such as a container or a partition or a configuration having a smooth inner surface shape can be employed. . Further, as the supercooling release means, for example, a stimulus applying means for the heat storage material such as application of pressure or deformation, energization, etc. can be employed. Further, as the supercooling suppression means, for example, addition of a supercooling inhibitor, installation of burrs or protrusions on the surface of a container, a partition wall or the like can be employed.

A transmission according to a second aspect of the present invention is the transmission according to the first aspect , further comprising control means for operating the supercooling release means when the vehicle is started.

In the transmission according to claim 2 , the control means receives the engine start signal or the like, for example, and operates the supercooling release means when the vehicle is started. For this reason, when the vehicle is started, the working fluid can be heated automatically by dissipating the solidified heat stored in the supercooled state of the heat storage body.

In order to achieve the above object, the transmission according to the third aspect of the present invention can cause a phase transition by heat exchange with the working fluid in a portion where the working fluid always flows in a circulation path through which the working fluid circulates. The transmission is provided with a heat storage body that includes a latent heat storage material, and the heat storage body is a latent heat storage material that has a melting point higher than the minimum temperature of the working fluid in an operating state and is likely to cause overcooling. comprise is configured, it determines a supercooling release means for releasing the supercooled state of the latent heat storage material constituting the regenerator, and the operation of the vehicle is continued on the basis of a signal from the operation stop estimating means In this case, the supercooling release means is operated, and when it is determined that the operation of the vehicle is stopped based on the signal from the operation stop estimation means, the operation of the supercooling release means is prohibited. Stop Wherein and and control means for actuating the supercooling releasing means at the start of the post.

In the transmission according to claim 3 , in the operating state, the working fluid that constantly circulates in the circulation path (acts so as to perform a predetermined function) always exchanges heat with the heat storage body provided in the circulation path. Do. As a result, when the working fluid temperature is higher than the phase transition temperature of the latent heat storage material constituting the heat storage body, the latent heat storage material of the heat storage body absorbs the latent heat accompanying the phase transition from the working fluid. Reduce the temperature. In addition, when the working fluid temperature is lower than the phase transition temperature of the latent heat storage material constituting the heat storage body, the temperature of the working fluid is increased by the radiation of latent heat accompanying the phase transition from the latent heat storage material that has absorbed heat as described above. be able to. Thus, in the transmission according to the third aspect, the temperature fluctuation range of the working fluid to be operated can be reduced with a simple structure. In addition, a heat storage body may be comprised only with a latent heat storage material, and may be comprised including the container etc. which enclose a latent heat storage material. Further, in this transmission, after starting, the working fluid is heated to a temperature equal to or higher than the lowest temperature in the operating state (for example, a set value between 70 ° C. and 80 ° C.), and enters the normal operating state. Then, after the operation of the transmission device is finished, when the working fluid temperature decreases, the latent heat storage material constituting the heat storage body does not solidify (solidify) and falls in a supercooled state. That is, this material is held in a state of storing latent heat in a supercooled state. When the supercooling release means is operated when the transmission is restarted, the latent heat storage material is solidified to dissipate solidification heat, and the working fluid is heated by this heat.

  As a result, in this transmission, the working fluid after startup is changed by the phase transition from the supercooled state (liquid phase) to the solid phase of the latent heat storage material whose melting point exceeds the minimum temperature in the operating state among the constituent materials of the heat storage body. The temperature can be raised. Accordingly, it is possible to promote warm-up by increasing the lower limit of the temperature fluctuation range of the working fluid at the time of operating the transmission and operating the supercooling release means immediately after starting.

  In addition, as a configuration in which supercooling is likely to occur, for example, in addition to selection of the constituent material itself of the heat storage body, a configuration having a low surface roughness such as a container or a partition or a configuration having a smooth inner surface shape can be employed. . Further, as the supercooling release means, for example, a stimulus applying means for the heat storage material such as application of pressure or deformation, energization, etc. can be employed.

Furthermore, in this transmission, after starting, the working fluid is heated to a temperature equal to or higher than the lowest temperature in the operating state (for example, a set value between 70 ° C. and 80 ° C.) and enters the normal operating state. Among the constituent materials of the heat storage body, the temperature of the latent heat storage material having a melting point exceeding the minimum temperature can rise and fall with the melting point interposed therebetween in a normal operation state. For this reason, when the temperature of the latent heat storage material rises beyond the melting point, the latent heat storage material melts (liquefies) and absorbs the heat of fusion (heat storage) from the working fluid. When the control means determines (has) that the operation of the vehicle is continued based on the signal from the operation stop estimation means, at least when the temperature of the constituent material of the heat storage body falls below the melting point, the supercooling is performed. Since the release means is operated, the constituent material of the heat storage body having a temperature lower than the melting point solidifies (solidifies) without reaching a supercooled state and generates heat (radiates heat).

  Thereby, in this transmission, the temperature fluctuation width of the working fluid in the normal operation state is reduced by the phase transition between the liquid phase and the solid phase of the latent heat storage material whose melting point exceeds the minimum temperature in the operation state among the constituent materials of the heat storage body. Can be small.

  On the other hand, if the control means determines (estimates) that the vehicle operation is to be stopped based on the signal from the operation stop estimation means, the control means prohibits the operation of the supercooling release means. After the operation of the transmission (vehicle) is completed, the latent heat storage material does not solidify (solidify) even when the temperature is lowered as the working fluid temperature decreases, and is in a supercooled state. That is, the latent heat storage material is held in a state where latent heat is stored in a supercooled state. When the control means operates the supercooling release means when the transmission is restarted, this material is solidified to dissipate solidification heat, and the working fluid is heated by this heat.

Thereby, in this transmission, the working fluid after starting can be heated up by the phase transition from the supercooled state (liquid phase) of the constituent material of a thermal storage body to a solid phase. Accordingly, it is possible to promote warm-up by increasing the lower limit of the temperature fluctuation range of the working fluid at the time of operating the transmission and operating the supercooling release means immediately after starting.
A transmission according to a fourth aspect of the present invention is the transmission according to any one of the first to third aspects, wherein the heat storage body has a melting point of −30 ° C. or higher and 200 ° C. or lower. It is comprised including the latent heat storage material which exists in the range.
In the transmission according to claim 4, since the heat storage body includes the latent heat storage material having a melting point within a temperature range (−30 ° C. to 200 ° C.) assumed as an operating environment of the working fluid, the latent heat is configured. The effect of reducing the temperature fluctuation range of the working fluid can be obtained with certainty by absorbing and releasing heat of the heat storage material.

  As described above, the transmission according to the present invention has an excellent effect that the temperature fluctuation range of the working fluid to be operated can be reduced with a simple structure.

The following “first embodiment” and “second embodiment” will be read as “reference examples”, respectively. An automatic transmission 10 as a transmission according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8.

  FIG. 1 is a schematic side view showing an automatic transmission 10 connected to an engine 12. The automatic transmission 10 is a device that shifts the output of the engine 12 and transmits it to the wheel side of the automobile applied together with the engine 12. As shown in FIG. 1, the automatic transmission 10 includes a transmission case 14 and an oil pan 16 provided at the lower portion of the transmission case 14. A torque converter and a speed change mechanism (such as a planetary gear train) (not shown) are disposed in the transmission case 14.

  Further, in the transmission case 14, pressure adjustment of an automatic transmission fluid (hereinafter referred to as ATF) as a working fluid that functions as a working oil, a lubricating oil, a refrigerant, or a heat medium in the torque converter and the transmission mechanism described above is performed. The control mechanism 18 is provided. As shown in FIG. 2, the control mechanism 18 adjusts the opening degree of each part of the valve body 20 that forms an operation channel for the ATF to perform a predetermined function and the operation channel formed in the valve body 20. And a plurality of control valves 22. At least some of the plurality of control valves 22 are configured to allow ATF to flow into the oil pan 16 when the operation flow path is opened.

  Further, as shown in FIG. 1, the automatic transmission 10 includes a hydraulic pump (not shown) that sucks ATF through the oil intake port 24 in order to pressure-feed the ATF in the oil pan 16 to the control mechanism 18. Thereby, in the automatic transmission 10, the ATF in the oil pan 16 is supplied to each part via the control mechanism 18 (valve body 20) by the operation of the hydraulic pump, and these ATFs are supplied to the oil pan after passing through a predetermined path. 16 is returned. Therefore, the oil pan 16 constitutes a part of an ATF circulation path as a circulation path in the automatic transmission 10. An upward arrow F shown in FIG. 1 indicates the flow of ATF supplied to the control mechanism 18 by the hydraulic pump, and a downward arrow R indicates an oil pan from a plurality of control valves 22 constituting the control mechanism 18. The flow of ATF returned to 16 is shown.

  As shown in FIGS. 1 and 2, the automatic transmission 10 includes a heat storage material heat exchanger 26 as a heat storage body. In this embodiment, the heat storage material heat exchanger 26 is disposed in the oil pan 16 so as to be capable of direct heat exchange (contact) with the ATF. The heat storage material heat exchanger 26 is configured, for example, as one or a plurality of containers filled with a liquid latent heat storage material, or a large number of microcapsules (with a built-in) containing the latent heat storage material.

  The heat storage material heat exchanger 26 is a container as described above so that one type of latent heat storage material having a melting point Tm within the temperature range (approximately −30 ° C. to 200 ° C.) of ATF assumed for automobiles does not mix with ATF. Etc., and filled or enclosed. That is, the heat storage material heat exchanger 26 is configured to store and release heat in accordance with the phase transition between the liquid layer and the solid phase of the latent heat storage material. Specifically, as shown by the black line in FIG. 5, the latent heat storage material constituting the heat storage material heat exchanger 26 is heated to the melting point Tm when heated in the solid phase, and further heated. Then, it absorbs latent heat (heat of fusion) without increasing its temperature, completely changes to the liquid phase, and then further heated to increase its temperature and store sensible heat. On the other hand, the latent heat storage material of the heat storage material heat exchanger 26 is cooled to the melting point Tm (dissipates sensible heat) and further cooled when cooled in the liquid phase, as indicated by the white arrow in FIG. Then, the latent heat (coagulation heat) is generated (heat radiation) without being cooled, and when it is completely cooled and then further cooled, the temperature is lowered and sensible heat is dissipated.

  Examples of the latent heat storage material constituting the heat storage material heat exchanger 26 include inorganic materials such as sodium acetate trihydrate, sodium thiosulfate pentahydrate, barium hydroxide octahydrate, and erythritol, A mixture of (adding) a melting point adjusting agent, a phase separation inhibitor, a supercooling inhibitor as a supercooling suppression means, and the like based on an organic material is used.

  As the melting point adjusting agent, for example, sodium chloride, potassium chloride, ammonium chloride, urea and the like can be used, and as the phase separation preventing agent, methylcellulose, starch, anlginate, sodium polyacrylate, acrylamide, carboxymethylcellulose, Attapal guide type clay, silicon dioxide and the like can be used. Further, as the supercooling preventive agent, sodium formate, ammonium acetate, polyoxyethylene glycol, sodium chloride, potassium chloride, sodium bromide, potassium bromide, lithium acetate, succinic acid, oxalic acid, maleic acid, sodium citrate salt , Disodium hydrogen phosphate, naphthalene, and the like can be used.

  And the latent heat storage material of the heat storage material heat exchanger 26 is configured such that overcooling does not easily occur due to the mixing of the supercooling inhibitor. As the supercooling suppression means, a mechanical supercooling suppression structure can be used instead of or in addition to the supercooling inhibitor mixing. As this mechanical supercooling suppression structure, for example, scratches and burrs are provided on the inner surface of a container or the like filled or enclosed with a latent heat storage material to roughen the roughness, or sharp protrusions protrude from the inner surface, It is possible to adopt a structure for setting a narrow path (both not shown).

  In this embodiment, the latent heat storage material constituting the heat storage material heat exchanger 26 has a melting point Tm higher than the lowest (lower limit) temperature To of the ATF in the normal operation state of the automatic transmission 10. . In this embodiment, the minimum temperature To of ATF in the normal operation state is set as a predetermined temperature within the range of 70 ° C. to 80 ° C., and the melting point Tm of the heat storage material heat exchanger 26 is 90 ° C. to 100 ° C. Is set to The set temperature of the melting point Tm is a temperature between the assumed minimum temperature To and the assumed maximum temperature (for example, 120 ° C.) in normal operation, and is set as a substantially intermediate temperature so as not to approach the upper and lower limits. . The latent heat storage material having such a melting point Tm can be obtained, for example, by mixing urea as a melting point adjusting agent with erystole as a base of the latent heat storage material.

  The minimum temperature To in the normal operation state of the ATF is set as a temperature at which the viscosity of the ATF is equal to or lower than a predetermined viscosity. Supplementing with reference to FIG. 8 showing the temperature-viscosity characteristics of ATF, ATF has low viscosity temperature dependence on the high temperature side and high viscosity temperature dependence on the low temperature side. Therefore, the automatic transmission 10 sets the minimum temperature To in the operating state of the ATF as a temperature at which the temperature dependency of the ATF becomes small (viscosity change per unit temperature change becomes equal to or less than a predetermined value). During the normal operation of the apparatus 10, the ATF has a low viscosity and is stabilized to a substantially constant value.

  Next, the operation of the first embodiment will be described.

  In the automatic transmission 10 having the above configuration, when the engine 12 is started prior to the travel of the applied automobile, the ATF circulates through the operation flow path including the control mechanism 18 and the oil pan 16. In the normal operation state, the ATF changes in temperature in a range where the temperature is higher than the minimum temperature To.

  In this automatic transmission 10, as indicated by the black arrows in FIG. 4, the solid phase latent heat storage material constituting the heat storage material heat exchanger 26 is heated in accordance with the temperature increase of the ATF. When the temperature of the heat storage material heat exchanger 26 reaches the melting point Tm, the latent heat storage material constituting the heat storage material heat exchanger 26 is melted. At this time, as shown in FIG. 3A, the heat storage material heat exchanger 26 absorbs latent heat (melting heat) required for melting from the ATF by heat exchange with the ATF in the oil pan 16 (see arrow A). ).

  Thus, until the latent heat storage material of the heat storage material heat exchanger 26 is completely liquefied, the ATF is cooled (heat is taken away) by the heat storage material heat exchanger 26, which is substantially constant at the temperature Tm, and the heat load increases. Under such circumstances, the temperature of the ATF can be maintained at a temperature near the melting point Tm of the heat storage material heat exchanger 26. In the state where the latent heat storage material of the heat storage material heat exchanger 26 is completely liquefied, heat corresponding to the heat of fusion of the heat storage material heat exchanger 26 is stored in the heat storage material heat exchanger 26.

  On the other hand, as shown by the white arrow in FIG. 4, when the load of the automatic transmission 10 is lowered and the temperature of the ATF is lowered from the liquid phase state of the latent heat storage material of the heat storage material heat exchanger 26, the ATF is reduced. As the temperature drops, the liquid phase latent heat storage material constituting the heat storage material heat exchanger 26 is cooled (sensible heat of the heat storage material heat exchanger 26 is consumed). When the temperature of the heat storage material heat exchanger 26 reaches the melting point Tm, the latent heat storage material constituting the heat storage material heat exchanger 26 is solidified. At this time, as shown in FIG. 3B, the heat storage material heat exchanger 26 dissipates latent heat (solidification heat) generated by solidification to the ATF by heat exchange with the ATF in the oil pan 16 (arrow B). reference).

  Then, until the latent heat storage material of the heat storage material heat exchanger 26 is completely solidified, the temperature of the heat storage material heat exchanger 26 is substantially constant at Tm, whereas the ATF is heated (heated), The ATF temperature can be maintained at a temperature near the melting point Tm of the heat storage material heat exchanger 26 under a situation where the load is reduced. When the latent heat storage material of the heat storage material heat exchanger 26 is completely solidified, all of the heat storage amount as latent heat of the heat storage material heat exchanger 26 is consumed.

  In the automatic transmission 10, during the normal operation, the above operation is repeated according to the load fluctuation. Thereby, in the automatic transmission 10, the temperature fluctuation range of the ATF in the normal operation state is small. FIG. 6 is a diagram showing the time change of the temperature of the ATF, and FIG. 7 is a diagram showing the temperature change of the ATF with respect to the automatic transmission 10, that is, the thermal load (operating load) of the ATF. Has been. As shown in these figures, the ATF temperature fluctuation (see the solid line) in the automatic transmission 10 is more variable than the ATF temperature fluctuation (see the broken line) in the comparative example that does not include the heat storage material heat exchanger 26. It was confirmed that both the upper and lower limits narrowed.

  Thus, in the automatic transmission 10 according to the first embodiment of the present invention, the temperature fluctuation range of the ATF during normal operation can be reduced.

  Here, an example of reducing the temperature fluctuation range of the ATF is shown. For example, in an automobile with an engine 12 output of 100 kW, if the efficiency of the automatic transmission 10 is 95%, the remaining 5% is lost, and the automatic transmission 10 has a heat loss of 5 kW, which is 5% of 100 kW. A cooling capacity of 5 kW is required. On the other hand, as described above, the heat storage material heat exchanger 26 made of a latent heat storage material having a melting point Tm of 100 ° C. by mixing urea with erystol has a melting (solidification) heat quantity of 330 [kJ / kg]. In the case where the 1 kg heat storage material heat exchanger 26 is disposed in the oil pan 16, the heat storage material heat exchanger 26 can absorb heat of 330 kJ from the ATF having a temperature higher than the melting point Tm (high load). . Assuming that the duration of the maximum load at the maximum load of the automatic transmission 10 is 10 minutes (min), the heat storage material heat exchanger 26 is 0.55 kW (= 330 kJ / (10 min × 60)) during the maximum load operation. Only absorbs heat from ATF. Therefore, the heat storage material heat exchanger 26 bears a cooling capacity of 0.55 kW, that is, 11% (= 0.55 kW / 5 kW × 100) of the cooling capacity 5 kW required for the automatic transmission 10. Here, the ATF temperature at the maximum load (100 kW) is 120 ° C, the ATF temperature at the minimum load is 80 ° C, and the temperature difference (40 ° C) between the maximum load and the minimum load is the required cooling capacity (5 kW). Assuming that it corresponds (the loss at the minimum load is 0 kW), the ATF temperature reduction effect due to the heat absorption of the heat storage material heat exchanger 26 at the maximum load is about 5 ° C. (≈40 ° C. × 11% / 100). Become. On the other hand, since this endothermic component can be used to increase the temperature at the minimum load, the effect of increasing the ATF temperature at the minimum load due to the heat radiation of the heat storage material heat exchanger 26 is approximately 5 ° C., and the temperature leveling is approximately 10 ° C. An effect is obtained.

  In the automatic transmission 10 that is a so-called AT, the shift is performed by automatically switching a plurality of planetary gear trains by a plurality of clutches and brake groups using the oil pressure of the ATF and changing a reduction ratio. The reconnection by the clutch and brake group is performed by adjusting the pressure by controlling the opening of the plurality of hydraulic control valve 22 groups. On the other hand, since ATF has a high temperature dependency, if the viscosity varies according to temperature fluctuation, the flow rate flowing through the control valve is different even at the same opening degree. Adjustment and adaptation of the control valve 22 group that can tolerate fluctuations of the engine requires a great deal of effort. However, in the automatic transmission 10, the fluctuation range of the ATF temperature fluctuation during normal operation can be remarkably reduced as described above. Therefore, in other words, the allowable range of the ATF viscosity change that needs to be considered in the design can be reduced, so that the design and development (adjustment, adaptation, etc.) of the plurality of control valves 22 can be easily performed. Become.

  Further, in the automatic transmission 10, the heat storage material heat exchanger 26 absorbs heat at the time of high load, so that the operating load of the cooling system (hydraulic pump, fan, radiator when connected, etc.) can be reduced. This contributes to improving the fuel efficiency of the applied car.

  Further, in the automatic transmission 10, the heat storage material heat exchanger 26 is disposed in the oil pan 16 in which ATF is always circulated, so that the temperature variation of the ATF can be changed without switching the ATF flow path to a bypass flow path, for example. The width can be reduced.

  Next, another embodiment of the present invention will be described. Note that portions that are basically the same as those in the first embodiment or the previous configuration are denoted by the same reference numerals as those in the first embodiment or the previous configuration, and description thereof is omitted. May be omitted.

(Second Embodiment)
9 shows an automatic transmission 30 as a transmission according to the second embodiment of the present invention in a schematic view corresponding to FIG. As shown in this figure, the automatic transmission 30 includes a heat storage material heat exchanger 32 in place of the heat storage material heat exchanger 26 using a latent heat storage material mixed with a supercooling inhibitor. This is different from the automatic transmission 10 according to the embodiment.

  The heat storage material heat exchanger 32 is selected as a base material of the heat storage material, and is selected to have a configuration that easily causes overcooling (for example, sodium acetate trihydrate, sodium thiosulfate pentahydrate), and is supercooled. The inhibitor is not mixed. Thereby, the latent heat storage material which comprises the heat storage material heat exchanger 32 is set as the structure which is easy to produce (it is hard to solidify) that supercooling (state which maintains a liquid phase in the temperature below melting | fusing point).

  Furthermore, in this embodiment, the latent heat storage material having the above-described configuration is sealed in a thin resin container such as polypropylene or a laminate film container so that overcooling is likely to occur (the overcooled state is easily maintained). Has been. Contrary to the above-described supercooling suppression means, a configuration in which overcooling is likely to occur without using a resin container or a laminate film container by smoothing the inner surface of the container or the like, or having a structure without protrusions, etc. Can be realized.

  The melting point Tm of the latent heat storage material constituting the heat storage material heat exchanger 32 is set to a value lower than the minimum temperature To of the ATF in the normal operation state. In this embodiment, the melting point Tm is set to 58 ° C. The latent heat storage material having such a configuration can be configured, for example, by mixing a melting point adjusting agent based on sodium acetate trihydrate.

  Further, the automatic transmission 30 operates to break the overcooling device 34 as a supercooling release means (solidification start means) for releasing the supercooling state of the latent heat storage material constituting the heat storage material heat exchanger 32. It has. The breakthrough cooling device 34 is, for example, a mechanical means for applying an external force such as pressure, deformation, vibration or displacement to the heat storage material heat exchanger 32, or an electricity for applying an electric current to the heat storage material heat exchanger 32. It can be configured by an appropriate means.

  Furthermore, the automatic transmission 30 is provided with a heat storage ECU 36 as a control means for controlling the operation of the breakthrough cooling device 34. The heat storage ECU 36 does not operate the breakthrough cooling device 34 during operation of the automatic transmission 30 (automobile to which the automatic transmission 30 is applied), and operates the breakthrough cooling device 34 when the automatic transmission 30 (engine 12) is started. It has become. The heat storage ECU 36 detects (determines) the start of the automatic transmission 30 based on, for example, a starter signal of the engine 12 or an ON signal of an IG switch.

  In the automatic transmission 30 configured as described above, since the melting point Tm of the heat storage material heat exchanger 32 is lower than the minimum temperature To of the ATF during normal operation, as shown in FIG. 10, in the normal operation state, the heat storage material heat exchanger. 32 always maintains the liquid phase, that is, the heat storage state of the heat of fusion. Then, although the latent heat storage material of the heat storage material heat exchanger 32 falls with the ATF when the operation of the automatic transmission 30 is finished, it tends to cause overcooling, so even if its own temperature falls below the melting point Tm (FIG. 10). The liquid phase, that is, the heat storage state of the heat of fusion is maintained.

  When detecting the start of the automobile, the heat storage ECU 36 operates the breakthrough cooling device 34 (see the “breakthrough cooling” point in FIG. 10). Then, as shown by the white arrow in FIG. 10, the latent heat storage material of the heat storage material heat exchanger 32 immediately solidifies and solidifies to the ATF (the amount of heat stored by heat exchange with the ATF during normal operation). Dissipate heat. As a result, the ATF is heated to raise the temperature, and warming up of the automatic transmission 30 is promoted.

  Thus, the heat storage material heat exchanger 32 is configured to easily cause overcooling, so that the solidified heat can be stored in the heat storage material heat exchanger 32 even when the automatic transmission 30 (the automobile to which the automatic transmission 30 is applied) is stopped for a long time. This solidification heat can be used to promote warm-up at start-up. In other words, in the automatic transmission 30, the ATF is heated in a short time due to the release of the solidification heat of the heat storage material heat exchanger 32, so that the comparison without the heat storage material heat exchanger 32 is performed as shown in FIG. 11. Compared to the example, the lower limit of the ATF operating temperature range can be raised.

  And it is known that warming up in a short time after starting contributes to improvement in fuel consumption by reducing friction loss and stirring loss depending on the viscosity of ATF. Fuel consumption is improved. Further, since the waste heat of the engine 12 is not used to warm up the automatic transmission 30, the automatic transmission 30 can be warmed up in a short time independently of the engine 12, and also promotes warming up of the engine 12. Contribute.

  Here, in the heat storage material heat exchanger 32 having the melting point Tm of 58 ° C., the solidification heat (heat of fusion) is approximately 260 [kJ / kg], and when 1 kg of the heat storage material heat exchanger 32 is used, Heat of 260 kJ is applied to the ATF from the heat storage material heat exchanger 32. If the mass of the automatic transmission 30 is 90 kg and the specific heat of iron (steel) constituting the automatic transmission 30 is 0.5 [kJ / kg · K], it is necessary to raise the temperature of the automatic transmission 30 by 1 ° C. Since the energy is 45 [kJ / K], the automatic transmission 30 can be heated by about 6 ° C. by receiving the heat of 260 [kJ]. For example, it is known that when the temperature of both the engine 12 and the automatic transmission 30 is increased by 1 ° C., there is an effect of improving fuel efficiency by approximately 1%. It can be seen that the fuel efficiency of the automobile to which the automatic transmission 30 is applied is greatly improved.

  Also in the automatic transmission 30, the heat storage material heat exchanger 32 absorbs heat at high loads, so that the operating load of the cooling system (hydraulic pump, fan, radiator when connected, etc.) is reduced. Can contribute to improving the fuel efficiency of the applied car.

  Further, in the automatic transmission 30, the heat storage material heat exchanger 32 is disposed in the oil pan 16 in which ATF is always circulated. Therefore, for example, immediately after the ATF is started without switching the ATF flow path to a bypass flow path or the like. Can be achieved.

(Third embodiment)
FIG. 12 shows a schematic diagram corresponding to FIG. 1 of an automatic transmission 40 as a transmission according to a third embodiment of the present invention. As shown in this figure, the automatic transmission 40 is provided with a heat storage material heat exchanger 42 in place of the heat storage material heat exchanger 26 composed of a single latent heat storage material, in the first embodiment. This is different from the automatic transmission 10 according to FIG.

  The heat storage material heat exchanger 42 is composed of two types of latent heat storage materials. The first latent heat storage material is set so that the melting point Tm1 is higher than the minimum temperature To of the ATF in the normal operation state, and the second latent heat storage material is set so that the melting point Tm2 is lower than the minimum temperature To. Has been. These two types of latent heat storage materials may be mixed, but in this embodiment, the latent heat storage material is partitioned by a partition wall or the like in a resin container, or is independently enclosed in a microcapsule or a laminate film container. Yes.

  The first latent heat storage material having a melting point of Tm1 is configured such that a supercooling preventive agent is mixed to prevent supercooling, and the partition wall or the container (capsule) similarly to the heat storage material heat exchanger 26. ) Scratches and protrusions are provided on the inner surface so that supercooling hardly occurs structurally. On the other hand, the second latent heat storage material having a melting point of Tm2 is configured such that supercooling is likely to occur by selecting a base material that is likely to cause supercooling and not mixing a supercooling inhibitor, and heat storage material heat Like the exchanger 32, it is configured such that it is more likely to cause overcooling (a supercooled state is easily maintained) by being enclosed in a thin resin container such as polypropylene or a laminate film container.

  In this embodiment, as the first latent heat storage material having a melting point of Tm1, a latent heat storage material constituting the heat storage material heat exchanger 26 (for example, a mixture of erythritol with urea and a supercooling inhibitor) is used. As a second latent heat storage material having a supercooling prevention structure and a melting point of Tm2, a latent heat storage material constituting the heat storage material heat exchanger 32 (for example, a mixture of sodium acetate trihydrate and a melting point adjusting agent) ) And a supercooling promoting structure.

  Other configurations of the automatic transmission 40 are the same as the corresponding configurations of the automatic transmission 30.

  In the automatic transmission 40 configured as described above, when the engine 12 is started prior to the travel of the applied automobile, the ATF circulates through the operation flow path including the control mechanism 18 and the oil pan 16. In the normal operation state, the ATF changes in temperature in a range where the temperature is higher than the minimum temperature To.

  In this automatic transmission 40, as indicated by the black arrows in FIG. 13, the two types of latent heat storage materials constituting the heat storage material heat exchanger 42 are heated in accordance with the temperature increase of the ATF. When the temperature of the heat storage material heat exchanger 42 reaches the melting point Tm1, the first latent heat storage material constituting the heat storage material heat exchanger 42 is melted. At this time, the heat storage material heat exchanger 42 absorbs latent heat (melting heat) required for melting the first latent heat storage material from the ATF by heat exchange with the ATF in the oil pan 16.

  Thereby, until the first latent heat storage material of the heat storage material heat exchanger 42 is completely liquefied, the ATF is cooled (heat is taken away) by the heat storage material heat exchanger 42 which is substantially constant at the temperature Tm1, and the heat Under the condition that the load is increased, the temperature of the ATF can be maintained at a temperature near the first melting point Tm1 of the heat storage material heat exchanger 42. In the state where the latent heat storage material of the heat storage material heat exchanger 42 is completely liquefied, the heat corresponding to the heat of fusion of the heat storage material heat exchanger 42 is stored in the heat storage material heat exchanger 26.

  On the other hand, when the temperature of the ATF decreases from the liquid phase state of the latent heat storage material of the heat storage material heat exchanger 42 as indicated by the white arrows in FIG. 13, the heat storage material heat exchanger is accompanied by the temperature decrease of the ATF. The liquid phase latent heat storage material constituting the temperature 42 is lowered. When the temperature of the heat storage material heat exchanger 42 reaches the melting point Tm1, the first latent heat storage material constituting the heat storage material heat exchanger 42 is solidified. At this time, the heat storage material heat exchanger 42 radiates latent heat (solidification heat) generated along with solidification to the ATF by heat exchange with the ATF in the oil pan 16.

  Then, until the latent heat storage material of the heat storage material heat exchanger 42 is completely solidified, the temperature of the heat storage material heat exchanger 42 is substantially constant at Tm1, whereas the ATF is heated (heated), The ATF temperature can be maintained at a temperature in the vicinity of the first melting point Tm1 of the heat storage material heat exchanger 42 under a situation where the load is reduced. When the latent heat storage material of the heat storage material heat exchanger 42 is completely solidified, all of the heat storage amount as latent heat of the heat storage material heat exchanger 42 is consumed. In the automatic transmission 40, during the normal operation, the above operation is repeated according to the load fluctuation.

  In the automatic transmission 40, the second latent heat storage material having a melting point of Tm2 always maintains the liquid phase, that is, the heat storage state of the melting heat in the normal operation state, as shown in FIG. When the operation of the automatic transmission 40 is finished, the second latent heat storage material cools down along with the ATF. However, since it tends to cause overcooling, even if its own temperature falls below Tm2 (see the white arrow in FIG. 13), The liquid phase, that is, the heat storage state of heat of fusion is maintained.

  When detecting the start of the automobile, the heat storage ECU 36 operates the breakthrough cooling device 34 (see the “breakthrough cooling” point in FIG. 13). Then, as indicated by the white arrow in FIG. 13, the latent heat storage material of the heat storage material heat exchanger 32 immediately solidifies and solidifies to the ATF (the amount of heat stored by heat exchange with the ATF during normal operation). Dissipate heat. As a result, the ATF is heated to raise the temperature, and warming up of the automatic transmission 10 is promoted.

  As described above, in the automatic transmission 40, as in the automatic transmission 10, the temperature fluctuation range of the ATF during normal operation is small, and the allowable range of the ATF viscosity change that needs to be considered in design can be reduced. Therefore, the design and development (adjustment, adaptation, etc.) of the plurality of control valves 22 can be easily performed. Moreover, in the automatic transmission 10, in order to make the heat storage material heat exchanger 42 absorb the heat at the time of high load operation, the operation load of the cooling system (hydraulic pump, fan, radiator when connected, etc.) is reduced. Can contribute to improving the fuel efficiency of the applied car.

  Here, in the automatic transmission 40, the heat storage material heat exchanger 42 includes a latent heat storage material that is likely to be overcooled, so that the automatic transmission 40 (automobile to which the automatic transmission 40 is applied) can generate solidification heat. It can be stored in the heat storage material heat exchanger 42, and this heat of solidification can be used for warm-up promotion at the start. As a result, as with the automatic transmission 30, the vehicle equipped with the automatic transmission 40 has improved fuel efficiency.

  Further, in the automatic transmission 40, since the heat storage material heat exchanger 42 is disposed in the oil pan 16 in which ATF always circulates, for example, the temperature fluctuation of the ATF can be performed without switching the ATF flow path to a bypass flow path or the like. The width can be reduced.

(Fourth embodiment)
FIG. 14 shows a schematic diagram corresponding to FIG. 1 of an automatic transmission 50 as a transmission according to a fourth embodiment of the present invention. As shown in this figure, the automatic transmission 50 has a heat storage material using a latent heat storage material in which the melting point Tm is set to be higher than the minimum temperature To in the normal operation state of the ATF and a supercooling preventive agent is mixed. It differs from the automatic transmission 10 according to the first embodiment in that a heat storage material heat exchanger 52 is provided instead of the heat exchanger 26.

  The heat storage material heat exchanger 52 is composed of one type of latent heat storage material that is likely to cause overcooling. And the heat storage material heat exchanger 52 is the heat storage material heat exchange of the automatic transmission 30 according to the second embodiment in that the melting point Tm of the latent heat storage material is higher than the minimum temperature To in the normal operation state of the ATF. Different from the vessel 32. The heat storage material heat exchanger 52 is different from the latent heat storage material constituting the heat storage material heat exchanger 26 in that the supercooling preventive agent is not mixed, and the latent heat storage material is thin such as polypropylene so that the latent heat storage material is likely to be overcooled. By being enclosed in a resin container or a laminate film container, it is configured such that overcooling is likely to occur (the overcooled state is easily maintained).

  Further, the automatic transmission 50 includes a heat storage ECU 54 that controls the operation of the breakthrough cooling device 34. The heat storage ECU 54 estimates whether the driving state of the vehicle to which the automatic transmission 50 is applied is continued or whether the driving of the vehicle is stopped based on a signal from the car navigation device 56 as a driving stop estimation unit. (Judgment) to come. For example, the heat storage ECU 54 estimates that the driving of the automobile is continued when a signal corresponding to the distance from the car navigation apparatus 56 being equal to or greater than a predetermined distance is input, and the car navigation apparatus 56, if the signal corresponding to the distance to the destination being less than the predetermined distance or the time required for the purpose being less than the predetermined time is input, it is estimated that the driving of the automobile is stopped. It is like that.

  In the automatic transmission 50 configured as described above, when the engine 12 is started prior to the travel of the applied automobile, the ATF circulates through the operation flow path including the control mechanism 18 and the oil pan 16. In the normal operation state, the ATF changes in temperature in a range where the temperature is higher than the minimum temperature To. First, the case where the heat storage ECU 54 estimates that the operation of the automobile to which the automatic transmission 50 is applied will be continued based on a signal from the car navigation device 56 will be described.

  In this case, in the automatic transmission 50, as indicated by the black arrows in FIG. 15, the solid phase latent heat storage material constituting the heat storage material heat exchanger 52 is heated with the temperature increase of the ATF. When the temperature of the heat storage material heat exchanger 52 reaches the melting point Tm, the latent heat storage material constituting the heat storage material heat exchanger 52 is melted. At this time, the heat storage material heat exchanger 52 absorbs latent heat (melting heat) required for melting the latent heat storage material from the ATF by heat exchange with the ATF in the oil pan 16.

  Thus, until the first latent heat storage material of the heat storage material heat exchanger 52 is completely liquefied, the ATF is cooled (heat is taken away) by the heat storage material heat exchanger 52 that is substantially constant at the temperature Tm, and the heat The temperature of the ATF can be maintained at a temperature near the melting point Tm of the heat storage material heat exchanger 52 under a situation where the load is increasing. In the state where the latent heat storage material of the heat storage material heat exchanger 26 is completely liquefied, heat corresponding to the heat of fusion of the heat storage material heat exchanger 26 is stored in the heat storage material heat exchanger 26.

  On the other hand, when the temperature of the ATF is lowered from the liquid phase state of the latent heat storage material of the heat storage material heat exchanger 52 as indicated by the white arrows in FIG. 15, the heat storage material heat exchanger is accompanied by the temperature decrease of the ATF. The liquid phase latent heat storage material constituting 52 is cooled. When the temperature of the heat storage material heat exchanger 52 reaches the melting point Tm, the heat storage ECU 54 operates the break-through cooling device 34, and the latent heat storage material constituting the heat storage material heat exchanger 52 does not reach the supercooling state ( (Or, the supercooling is released) and it is solidified. At this time, the heat storage material heat exchanger 52 radiates latent heat (solidification heat) generated along with solidification to the ATF by heat exchange with the ATF in the oil pan 16.

  Then, until the latent heat storage material of the heat storage material heat exchanger 52 is completely solidified, the temperature of the heat storage material heat exchanger 52 is substantially constant at Tm, whereas the ATF is heated (heated), The ATF temperature can be maintained at a temperature in the vicinity of the melting point Tm of the heat storage material heat exchanger 52 under a situation where the load is reduced. When the latent heat storage material of the heat storage material heat exchanger 52 is completely solidified, all of the heat storage amount as latent heat of the heat storage material heat exchanger 52 is consumed. In the automatic transmission 50, during the normal operation, the above operation is repeated according to the load fluctuation.

  Next, a case where the heat storage ECU 54 estimates that the driving of the automobile will be stopped based on a signal from the car navigation device 56 will be described. In this case, in the automatic transmission 50, since the heat storage ECU 54 prohibits the breakthrough cooling device 34 from operating, the latent heat storage material that is likely to cause overcooling of the heat storage material heat exchanger 52 is terminated in the operation of the automatic transmission 50. When the temperature is lowered with the ATF later and the temperature falls below Tm2 (see the white arrow in FIG. 13), the liquid phase, that is, the heat storage state of the melting heat is maintained without solidifying.

  When the heat storage ECU 54 detects the start of the automobile, it operates the breakthrough cooling device 34 (see the “breakthrough cooling” point in FIG. 15). 15, the latent heat storage material of the heat storage material heat exchanger 52 immediately solidifies and solidifies with respect to the ATF (the amount of heat stored by heat exchange with the ATF during normal operation). Dissipate heat. As a result, the ATF is heated to raise the temperature, and warming up of the automatic transmission 10 is promoted.

  As described above, in the automatic transmission 50, as in the automatic transmission 10, the temperature fluctuation range of the ATF during normal operation is small, and the allowable range of the ATF viscosity change that needs to be considered in design can be reduced. Therefore, the design and development (adjustment, adaptation, etc.) of the plurality of control valves 22 can be easily performed. Moreover, in the automatic transmission 10, in order to make the heat storage material heat exchanger 52 absorb the heat at the time of high load operation, the operation load of the cooling system (hydraulic pump, fan, radiator when connected, etc.) is reduced. Can contribute to improving the fuel efficiency of the applied car.

  Here, in the automatic transmission 50, the heat storage material heat exchanger 52 includes a latent heat storage material that is likely to be overcooled, so that the automatic transmission device 50 (automobile to which the automatic transmission 50 is applied) can generate solidification heat. It can be stored in the heat storage material heat exchanger 52, and this heat of solidification can be used for warm-up promotion at the start. As a result, as with the automatic transmissions 30 and 40, the fuel efficiency of an automobile equipped with the automatic transmission 50 is improved. In particular, in the heat storage material heat exchanger 52, since the melting point of the latent heat storage material that stores solidification heat in a supercooled state is high, in other words, the temperature difference of the low temperature ATF is low because the temperature of the latent heat storage material during solidification is high. The heat transfer from the heat storage material heat exchanger 52 to the ATF is greatly promoted. Thus, the automatic transmission 50 is warmed up in a shorter time.

  Further, in the automatic transmission 50, since one type of latent heat storage material performs different functions during normal operation and at the time of startup, compared with a configuration including two types of latent heat storage materials with different functions, The mass of the latent heat storage material increases. Therefore, as compared with the automatic transmission 40 according to the third embodiment, if the mass of the heat storage material heat exchanger 42 and the heat storage material heat exchanger 52 is the same, the effect of suppressing temperature fluctuation during normal operation, starting The warm-up promotion effect at the time is also improved.

  Further, in the automatic transmission 50, since the heat storage material heat exchanger 52 is disposed in the oil pan 16 in which ATF is always circulated, the temperature variation of the ATF can be changed without switching the ATF flow path to a bypass flow path, for example. The width can be reduced.

  In each of the above embodiments, the heat storage material heat exchangers 26, 32, 42, and 52 are disposed in the oil pan 16, but the present invention is not limited to this. For example, the ATF circulation path It is good also as a structure which arrange | positions the thermal storage material heat exchanger 26 grade | etc., To the piping (large diameter part provided in) etc. which comprise.

  Moreover, in each said embodiment, although the automatic transmission 10, 30, 40, 50 showed the example which is what is called AT, this invention is not limited to this, What is necessary is just the transmission using a working fluid, for example, The present invention can be applied to a belt-type or toroidal-type continuously variable transmission or the like.

1 is a side view schematically showing an automatic transmission according to a first embodiment of the present invention. It is a side view which shows the principal part of the automatic transmission which concerns on the 1st Embodiment of this invention. It is a figure which shows the thermal storage heat dissipation state of the thermal storage material heat exchanger which comprises the automatic transmission which concerns on the 1st Embodiment of this invention, Comprising: (A) is a side view of an endothermic state, (B) is a side view of a thermal radiation state. FIG. It is a diagram which shows the relationship between the thermal storage amount and temperature of the thermal storage material heat exchanger which comprises the automatic transmission which concerns on the 1st Embodiment of this invention. It is a diagram which shows the relationship between the heat storage amount and temperature in the latent heat storage material single-piece | unit which comprises the heat storage material heat exchanger of the automatic transmission which concerns on the 1st Embodiment of this invention. It is a diagram which shows the time fluctuation of the ATF temperature of the automatic transmission which concerns on the 1st Embodiment of this invention. It is a diagram which shows the fluctuation | variation with respect to the thermal load of ATF temperature of the automatic transmission which concerns on the 1st Embodiment of this invention. FIG. 3 is a diagram schematically illustrating a viscosity characteristic with respect to a temperature of ATF that is a working fluid of the automatic transmission according to the first embodiment of the present invention. It is a side view which shows typically the automatic transmission which concerns on the 2nd Embodiment of this invention. It is a diagram which shows the relationship between the thermal storage amount and temperature of the thermal storage material heat exchanger which comprises the automatic transmission which concerns on the 2nd Embodiment of this invention. It is a diagram which shows the fluctuation range from the time of the low temperature start of the ATF temperature of the automatic transmission which concerns on the 2nd Embodiment of this invention to the time of the maximum load. It is a side view which shows typically the automatic transmission which concerns on the 3rd Embodiment of this invention. It is a diagram which shows the relationship between the thermal storage amount and temperature of the thermal storage material heat exchanger which comprise the automatic transmission which concerns on the 3rd Embodiment of this invention. It is a side view which shows typically the automatic transmission which concerns on the 4th Embodiment of this invention. It is a diagram which shows the relationship between the thermal storage amount and temperature of the thermal storage material heat exchanger which comprise the automatic transmission which concerns on the 4th Embodiment of this invention.

Explanation of symbols

10 Automatic transmission (transmission)
16 Oil pan (working fluid circulation path)
26 Heat storage material heat exchanger (heat storage)
30, 40, 50 Automatic transmission (transmission)
32, 42, 52 Heat storage material heat exchanger 34 Breakdown cooling device (supercooling release means)
36.54 Thermal storage ECU (control means)
56 Car navigation system (operation stop estimation means)

Claims (4)

A transmission in which a heat storage body configured to include a latent heat storage material capable of causing a phase transition by heat exchange with the working fluid is provided in a portion where the working fluid always flows in a circulation path through which the working fluid circulates. There,
The heat storage body has a first latent heat storage material having a melting point higher than the minimum temperature of the working fluid in the operating state, and a configuration in which the melting point is lower than the minimum temperature of the working fluid in the operating state and easily causes overcooling. A second latent heat storage material,
Supercooling suppression means for suppressing overcooling of the first latent heat storage material;
Supercooling release means for releasing supercooling of the second latent heat storage material;
Speed change device provided with.   2. The transmission according to claim 1, further comprising a control means for operating the supercooling release means when the vehicle is started. A transmission in which a heat storage body configured to include a latent heat storage material capable of causing a phase transition by heat exchange with the working fluid is provided in a portion where the working fluid always flows in a circulation path through which the working fluid circulates. There,
The heat storage body is configured to include a latent heat storage material that has a melting point higher than the minimum temperature of the working fluid in an operating state and easily causes overcooling,
Supercooling release means for releasing the supercooling state of the latent heat storage material constituting the heat storage body;
When it is determined that the operation of the vehicle is continued based on the signal from the operation stop estimation means, the supercooling release means is operated, and the operation of the vehicle is stopped based on the signal from the operation stop estimation means. Control means for prohibiting the operation of the supercooling release means when it is determined, and operating the supercooling release means at the start after the vehicle is stopped,
A transmission comprising:   The transmission according to any one of claims 1 to 3, wherein the heat storage body includes a latent heat storage material having a melting point in a range of -30 ° C or higher and 200 ° C or lower.

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