JP4375045B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger suitable for use in, for example, warming up and cooling hydraulic oil for an automatic transmission in a vehicle engine.

  As a heat exchanger for hydraulic oil of a conventional automatic transmission, as shown in Patent Document 1, a heat exchange section (element in the publication) through which hydraulic oil flows is housed in a dedicated main body. It is known that the engine cooling water is recirculated when the thermostat is closed (specifically, a heater hot water circuit in which a heater core is provided).

In this heat exchanger, heat exchange is performed between the hydraulic oil and engine cooling water, and the hydraulic oil is warmed up during warm-up operation after engine startup and the hydraulic oil is cooled during engine steady-state operation. The degree of freedom of mounting is increased by providing a dedicated body.
JP 2002-47935 A

  However, in the above heat exchanger, the cooling water in the heater hot water circuit is used as the cooling water because the working oil is cooled in the steady operation of the engine and the warming-up of the working oil is taken into consideration. Therefore, if the engine operating load is high and the temperature rise of the hydraulic oil is high, there may be a case where sufficient cooling cannot be obtained.

  Therefore, it is conceivable to add an auxiliary heat exchanger for cooling the hydraulic oil, but if this is done, the hydraulic oil will be cooled by the auxiliary heat exchanger when warming up. Performance will deteriorate.

  In view of the above problems, an object of the present invention is to provide a heat exchanger that enables sufficient cooling in accordance with the temperature of hydraulic oil in addition to warming up of hydraulic oil such as an engine or an automatic transmission. .

  In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the present invention, the engine (10) or the automatic transmission (20) is disposed in the circulation passage (120A) through which the hydraulic fluid circulates outside, and bypasses the radiator (32) for the engine (10). Heat exchanger (110) for exchanging heat between the cooling water supplied and the hydraulic oil, and the cooling water warms up the hydraulic oil after starting the engine (10) and In a heat exchanger that cools hydraulic oil,
In the circulation channel (120A), an auxiliary heat exchange part (140) for cooling the hydraulic oil,
A bypass flow path (124) for bypassing the auxiliary heat exchange section (140);
Engine (10) hydraulic oil to flow only to the bypass flow path (124) side after the start, the heat exchange portion (110) and the auxiliary heat exchanger (140) Tonouchi heat exchanger unit (110) only by operating While warming up the hydraulic oil, the flow rate of the hydraulic oil to the bypass flow path (124) side and the auxiliary heat exchange part (140) side is adjusted according to the temperature of the hydraulic oil after warming up , and the heat exchange part ( 110) and the auxiliary heat exchanging section (140) are provided, and a flow rate adjusting valve (150) for cooling the hydraulic oil is provided.

  Thereby, after starting an engine (10), since hydraulic fluid circulates only through a heat exchange part (110), it is warmed up early by cooling water. After the warm-up, the hydraulic oil is circulated through the auxiliary heat exchange unit (140) in addition to the heat exchange unit (110) by the flow rate adjusting valve (150). Can be cooled sufficiently.

  In general, the heat exchanger (100) that allows both early warming and sufficient cooling of the hydraulic oil can be obtained.

  The heat exchanging part (110) is warmed up or cooled with respect to the hydraulic oil for the automatic transmission (20) of the engine (10) or the automatic transmission (20) as in the invention described in claim 2. It is suitable for use as an ATF warmer (110) for performing

  In the invention according to claim 3, the flow rate adjustment valve (150) is on the bypass flow path (124) side or the auxiliary heat exchanging part (140) side by a thermal expansion body that expands and contracts according to the temperature of the hydraulic oil. It is characterized by being a thermo valve (150) which can vary the valve opening degree.

  This eliminates the need for a hydraulic oil temperature detection means and a control device for varying the valve opening degree of the flow rate adjustment valve (150), and enables an inexpensive response.

  Furthermore, the invention according to claim 4 is characterized in that the auxiliary heat exchanging section (140) is an air-cooling heat exchanging section (140) for cooling the hydraulic oil by exchanging heat with external air.

  As a result, a large temperature difference from the hydraulic oil can be obtained by the external air having a temperature lower than that of the cooling water, so that the hydraulic oil can be effectively cooled.

  In the invention according to claim 5, the cooling water supplied to the heat exchanging section (110) is cooling water flowing through the heater hot water circuit (40) in which the heating heat exchanger (42) is disposed. It is characterized by.

  Thereby, it is not necessary to set a new circuit by utilizing the heater hot water circuit (40) provided in the cooling water circuit of the normal engine (10).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the present invention is applied to the hydraulic oil heat exchanger 100 of the automatic transmission 20 of the automobile engine 10.

  As shown in FIG. 1, the engine 10 has an automatic transmission 20. As is well known, an automatic transmission incorporates a torque converter that acts as a clutch and various gears for shifting. The torque converter uses hydraulic oil as a power transmission medium (automatic transmission fluid). Is used. A heat exchanger 100 described later is provided to raise the temperature of the hydraulic oil early and to keep it at an appropriate temperature by cooling at a high temperature. The automatic transmission 20 is provided with an oil outlet portion 21 and an oil inlet portion 22 so that the hydraulic oil flows back through a circulation passage 120A including a bypass passage 124 described later by a pump (not shown). Yes.

  The engine 10 is provided with a radiator cooling water circuit 30 for maintaining the engine 10 itself at an appropriate temperature. This is a circuit in which a radiator 32 is disposed in the middle of a radiator flow path 31 in which cooling water in the engine 10 is recirculated by the water pump 11. A thermostat (not shown) is provided on the upstream side of the radiator 32 in the radiator flow path 31.

  Further, the engine 10 is provided with a heater hot water circuit 40 in which a heater core 42 is disposed in the middle of the heater flow path 41 that flows out of the engine 10 and returns to the water pump 11 side as a radiator bypass circuit that bypasses the radiator 32. It has been. The heater core 42 is a well-known heating heat exchanger that heats air for air conditioning using cooling water (hot water) as a heat source. The heater circuit 40 is not provided with variable flow means such as a valve, and the cooling water in the engine 10 is always recirculated by the water pump 11. In particular, when a thermostat (not shown) provided in the radiator flow path 31 is closed after the engine 10 is started, the cooling water flows only through the heater hot water circuit 40.

  The heat exchanger 100 of the present invention includes an ATF warmer 110, an oil cooler 140, and a thermo valve disposed in a circulation flow channel 120A formed by the flow channels 121, 122, and 123 and the pipes 131 and 132 in the spacer 120. 150 mag.

  As shown in FIGS. 2 and 3, the ATF warmer (corresponding to the heat exchanging portion in the present invention) 110 is a heat exchanger that warms up and cools the hydraulic oil of the automatic transmission 20. It is assumed to be of the round type laminated type. More specifically, the ATF warmer 110 is a main body in which a plurality of round plate members having a plurality of openings are stacked and an oil circulation part and a cooling water circulation part are formed inside by communicating each opening part. A disc-shaped flange portion 112 is joined to the portion 111.

  An inlet port 113 and an outlet port 114 are formed in the flange portion 112 so as to communicate with an oil circulation portion in the main body portion 111. In addition, a heater flow path 41 (FIG. 1) is connected to the cooling water circulation part, and the cooling water from the engine 10 flows. The ATF warmer 110 is not limited to the above-described laminated type, but a case in which an oil unit is accommodated in a round or square case, or a cylindrical member having a different outer diameter is coaxially disposed. Various types such as a multi-tube type can be selected.

  The spacer 120 has a warmer inlet channel 121, a warmer outlet channel 122, a mission inlet channel 123, a bypass channel 124, and a valve accommodating portion 125 formed in an aluminum block-shaped member. Along with the warmer 110, the bolt 160 (FIG. 1) is fastened to the outer surface of the automatic transmission 20. In addition, packing 170 for preventing hydraulic oil leakage is interposed between the automatic transmission 20 and the spacer 120 and between the ATF warmer 110 and the spacer 120, respectively.

  In the spacer 120, the warmer inlet channel 121 is formed as a channel that connects the oil outlet 21 of the automatic transmission 20 and the inlet port 113 of the ATF warmer 110, and the warmer outlet channel 122 is an outlet of the ATF warmer 110. The port 114 and the outside of the spacer 120 are formed as a flow path that communicates with each other, and the mission inlet flow path 123 is formed as a flow path that communicates the other exterior of the spacer 120 with the oil inlet portion 22 of the automatic transmission 20. The bypass channel 124 is formed as a channel that connects the outlet port 114 and the oil inlet 22. Further, the valve accommodating portion 125 is formed as a space communicating with the warmer outlet channel 122 and the bypass channel 124 from one side surface of the spacer 120.

  An inlet pipe 131 connected to the inlet side of the oil cooler 140 is connected to the warmer outlet channel 122, and an outlet pipe 132 connected to the mission inlet channel 123 from the outlet side of the oil cooler 140 is connected.

  Circulation passage 120A through which the hydraulic oil in the automatic transmission 20 is returned to the outside by a pump (not shown) by the warmer inlet passage 121, the warmer outlet passage 122, the inlet pipe 131, the outlet pipe 132, and the mission inlet passage 123. Thus, the ATF warmer 110 and the oil cooler 140 are arranged in series in the circulation flow path 120A. Further, the bypass flow path 124 allows the hydraulic oil to bypass the oil cooler 140 in the circulation flow path 120 </ b> A to form a flow path that passes only the ATF warmer 110.

  Note that the oil cooler (corresponding to the auxiliary heat exchanging portion in the present invention) 140 is an air-cooled drone cup oil cooler made of aluminum in which tubes and outer fins, each consisting of a pair of tube plates, are alternately stacked. Corresponding to the air-cooling type heat exchanging part in the invention) and arranged on the vehicle front side of the radiator 32 (FIG. 1).

  A thermo valve (corresponding to a flow rate adjusting valve in the present invention) 150 is disposed in the valve accommodating portion 125 of the spacer 120 and includes a temperature sensing portion 151, a shaft 152, a first valve 153, and a second valve 154.

  The temperature sensing part 151 is a container body in which a thermo wax (corresponding to the thermal expansion body in the present invention) is enclosed. The thermowax expands and contracts according to the temperature of the hydraulic oil flowing from the warmer outlet flow path 122 into the valve accommodating portion 125 (sensing the temperature).

  One end of the shaft 152 is inserted into the temperature sensing portion 151 and supported by a spring (not shown), and the length of the shaft 152 is increased by the balance between the thermal wax in the temperature sensing portion 151 and the spring force. Reciprocated in the direction.

  A first valve 153 and a second valve 154 are provided on the other end side of the shaft 152. The first valve 153 and the second valve 154 reciprocate in conjunction with the shaft 152, and the first valve 153 opens and closes the warmer outlet flow path 122 communicating with the valve accommodating portion 125, and the second valve 154 Opens and closes the bypass flow path 124 communicating with the valve accommodating portion 125.

  The opening and closing timing of the flow paths 122 and 124 by the first valve 153 and the second valve 154 is such that when the temperature of the hydraulic oil exceeds a predetermined temperature, the first valve 153 closes the warmer outlet flow path 122 (see FIG. 2 and FIG. 3), the second valve 154 moves from the open state (FIGS. 2 and 3) to the closed state (FIGS. 4 and 5). Like to do. The predetermined temperature is a temperature according to a temperature at which the hydraulic oil can operate efficiently as a medium of the torque converter.

  Next, the operation and effect of the heat exchanger 100 based on the above configuration will be described.

  First, immediately after the start of the engine 10, the thermostat of the radiator flow path 31 is closed, and the operation of the water pump 11 causes the cooling water to circulate mainly through the heater hot water circuit 40, so The cooling water flows through the cooling water circulation part. In addition, the hydraulic oil in the automatic transmission 20 flows out from the oil outlet 21 by the operation of a pump (not shown). The hydraulic oil flows from the warmer inlet passage 121 and the inlet port 113 of the spacer 120 through the oil circulation portion in the main body 111 of the ATF warmer 110, and from the outlet port 114 to the warmer outlet passage 122, the valve accommodating portion 125 and the bypass passage 124. To.

  At this time, since the operating oil has not yet been heated and is not more than a predetermined temperature, the thermo wax in the temperature sensing portion 151 of the thermo valve 140 is in a contracted state, and the shaft 152 is moved in FIG. 3, the warmer outlet flow path 122 is closed by the first valve 153, and the bypass flow path 124 is opened by the second valve 154. Therefore, the hydraulic oil that has flowed through the ATF warmer 110 returns from the outlet port 114 to the automatic transmission 20 through the bypass passage 124 and the oil inlet portion 22.

  That is, the hydraulic oil flows only through the ATF warmer 110 and returns to and from the automatic transmission 20, so that the cooling water that bypasses the radiator 32 and rises in temperature as the engine 10 warms up is used. The temperature is raised (warmed up) in a short time.

  On the other hand, when the hydraulic oil is warmed up and the temperature thereof exceeds a predetermined temperature, the thermo wax in the temperature sensing portion 151 expands, and the shaft 152 in FIGS. 4 and 5 is caused by the expansion force of the thermo wax. The warmer outlet flow path 122 is sequentially opened by the first valve 153 by sliding to the left side, and when the thermowax is completely expanded, the bypass flow path 124 is completely closed by the second valve 154. Therefore, the hydraulic oil that has circulated through the ATF warmer 110 passes through the warmer outlet flow path 122, the inlet pipe 131, the oil cooler 140, the outlet pipe 132, the mission inlet flow path 123, and the oil inlet portion 22 from the outlet port 114. Return to 20.

  That is, the hydraulic oil flows through both the ATF warmer 110 and the oil cooler 140 in the circulation flow path 120A and returns to the automatic transmission 20, and is cooled by both the ATF warmer 110 and the oil cooler 140. That is why. In addition, since the opening degree with respect to the warmer outlet flow path 122 by the first valve 153 increases as the temperature rise of the hydraulic oil exceeds the predetermined temperature, the amount of hydraulic oil flowing to the oil cooler 140 side increases. The cooling effect will be enhanced.

  Thus, in the present heat exchanger 100, the hydraulic oil is warmed up immediately immediately after the engine 10 is started, and when the hydraulic oil temperature further rises after the warm-up, the ATF warmer 110 alone cannot cool the hydraulic oil. Since the oil cooler 140 can be utilized by switching the hydraulic oil flow path, sufficient cooling can be performed.

  Further, here, since the thermo valve 150 is used for switching the hydraulic oil flow path, the hydraulic oil temperature detecting means and the control device for changing the valve opening of the valve are not required, so that it can be inexpensively handled. It becomes possible.

  In addition, since an air-cooled type is used as an auxiliary heat exchanger for cooling the hydraulic oil, a large temperature difference from the hydraulic oil can be obtained by external air having a temperature lower than that of the cooling water. Can be cooled.

  Furthermore, since the cooling water supplied to the ATF warmer 110 is used as the cooling water flowing through the heater hot water circuit 40, it is used as the cooling water for warming up the hydraulic oil without setting a new circuit. it can.

(Other embodiments)
In the said 1st Embodiment, although the heat exchanger 100 of this invention was demonstrated as what is used for the warming-up and cooling of the hydraulic oil of the automatic transmission 20 (ATF warmer), it is not restricted to this, For hydraulic oil of the engine 10 It may be used as (oil warmer).

  Further, the arrangement of the ATF warmer 110 and the oil cooler 140 in the circulation channel 120A is reversed between the upstream side and the downstream side, and the thermo valve 150 is provided upstream of the oil cooler 140 in the bypass channel 124. good.

  Further, the flow rate adjusting valve may be an electromagnetic valve instead of the thermo valve 150. In this case, depending on the temperature obtained by the temperature detection means (temperature sensor or the like) of the hydraulic oil, The opening degree of the electromagnetic valve may be controlled.

  The oil cooler 140 is not limited to an air-cooled type. For example, the oil cooler 140 may be a water-cooled type using cooling water flowing through the radiator cooling water circuit 30.

  Further, the circuit for supplying the cooling water to the ATF warmer 110 is not limited to the heater hot water circuit 40, and a dedicated circuit for bypassing the radiator 32 may be provided and used.

It is a schematic diagram which shows the whole structure in 1st Embodiment of this invention. It is sectional drawing which shows the flow direction of the working oil at the time of the heat exchanger in FIG. 1, and warming-up. It is sectional drawing which shows the flow direction of the working oil at the time of the heat exchanger and warming-up seen from the A direction in FIG. It is sectional drawing which shows the flow direction of the working oil after the heat exchanger in FIG. 1, and warming-up. It is sectional drawing which shows the flow direction of the hydraulic oil after the heat exchanger and warming-up seen from the B direction in FIG.

Explanation of symbols

10 Engine 20 Automatic transmission 32 Radiator 40 Heater hot water circuit 42 Heater core (heat exchanger for heating)
100 heat exchanger 110 ATF warmer (heat exchanger)
120A Circulation circuit 124 Bypass flow path 140 Oil cooler (auxiliary heat exchange part, air-cooled heat exchange part)
150 Thermo valve (Flow control valve)

Claims (5)

Cooling water that is disposed in a circulation passage (120A) through which hydraulic oil of the engine (10) or the automatic transmission (20) circulates externally and is supplied by bypassing the radiator (32) for the engine (10); A heat exchanging part (110) for exchanging heat with the hydraulic oil;
In the heat exchanger for warming up the hydraulic oil after starting the engine (10) and cooling the hydraulic oil after the warm-up by the cooling water,
In the circulation channel (120A), an auxiliary heat exchange part (140) for cooling the hydraulic oil,
A bypass flow path (124) for bypassing the auxiliary heat exchange section (140);
The engine (10) the hydraulic fluid to flow only in the bypass flow path (124) side after the start, the heat exchanging portion (110) and the auxiliary heat exchanger (140) Tonouchi the heat exchange section (110 ) Is operated to warm up the hydraulic oil, and after the warm-up, the operation to the bypass flow path (124) side and the auxiliary heat exchange section (140) side according to the temperature of the hydraulic oil A flow rate adjustment valve (150) for adjusting the flow rate of oil and operating the heat exchange part (110) and the auxiliary heat exchange part (140) to cool the hydraulic oil is provided. Heat exchanger.   The heat exchange unit (110) is an ATF warmer (ATF warmer) that warms or cools the hydraulic fluid for the automatic transmission (20) of the engine (10) or the automatic transmission (20). 110) The heat exchanger according to claim 1, wherein the heat exchanger is 110).   The flow rate adjusting valve (150) varies the valve opening degree on the bypass flow path (124) side or the auxiliary heat exchange part (140) side by a thermal expansion body that expands and contracts according to the temperature of the hydraulic oil. The heat exchanger according to claim 1 or 2, wherein the heat exchanger is a thermo valve (150).   The said auxiliary heat exchange part (140) is an air-cooling type heat exchange part (140) which cools the said hydraulic oil by heat exchange with external air, The any one of Claims 1-3 characterized by the above-mentioned. Heat exchanger.   The said cooling water supplied to the said heat exchange part (110) is a cooling water which distribute | circulates the heater hot water circuit (40) by which the heat exchanger for heating (42) is arrange | positioned. The cooling water circuit according to claim 4.

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