JP2010151164A - Oil heating device of transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly heat oil in a transmission with a simple structure without affecting the temperature of cooling water. <P>SOLUTION: Oil drawn from an oil reservoir 18 of the transmission T by an oil pump 22 provided in an oil supply passage 19 is supplied to a heat exchange passage 16 arranged inside an internal combustion engine E and the oil raised in temperature through heat exchange with the internal combustion engine E in the heat exchange passage 16 is returned from the heat exchange passage 16 to the oil reservoir 18 through an oil return passage 20 so that the oil of the transmission T can be quickly raised in temperature without disturbing temperature rise of the cooling water after starting of the internal combustion engine E and power transmission efficiency of the transmission T can be improved. The heat exchange passage 16 is arranged below a top surface 17a of a piston 17 at a bottom dead center, which is slidably fitted in a cylinder 12, so that disturbance to warming-up of the internal combustion engine E by the heat exchange passage 16 is minimized and oil temperature can be prevented from excessively rising after completion of warming-up operation of the internal combustion engine E. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil heating apparatus for a transmission that heats oil of a transmission connected to an internal combustion engine.

A heat exchanger is arranged in the oil reservoir of the transmission connected to the internal combustion engine, and the high-temperature cooling water or low-temperature cooling water of the internal combustion engine is supplied to the oil reservoir heat exchanger with a water pump capable of forward and reverse rotation. Japanese Patent Application Laid-Open No. 2004-151867 discloses that heat is exchanged between transmission oil and cooling water to control the temperature of the oil to an appropriate temperature.
JP-A-8-247263

  By the way, what was described in the said patent document 1 requires the heat exchanger provided in the oil reservoir of a transmission, and the piping which supplies and discharges cooling water to the heat exchanger, and the number of parts and cost increase. In addition, as shown in FIG. 9, when the transmission oil is heated with cooling water after the internal combustion engine is started, not only the oil cannot be heated until the temperature of the cooling water rises, but also the heat of the cooling water. There is a problem that the temperature of the cooling water is delayed because of the loss of oil.

  The present invention has been made in view of the above circumstances, and an object thereof is to quickly heat oil in a transmission with a simple structure without affecting the temperature of cooling water.

  In order to achieve the above object, according to the first aspect of the present invention, an oil heating device for a transmission for heating oil in a transmission connected to the internal combustion engine is disposed inside the internal combustion engine. A heat exchange passage through which oil of the transmission circulates, an oil supply passage for supplying oil from the oil reservoir of the transmission to the heat exchange passage, and an oil from the heat exchange passage to the oil reservoir or the oil supply passage. An oil heating device for a transmission is proposed, comprising an oil return passage for returning and an oil pump arranged in the oil supply passage for pumping up oil in the oil reservoir.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, a filter is provided at the upstream end of the oil supply passage, and the downstream end of the oil return passage is provided with the filter of the oil supply passage. An oil heating device for a transmission is proposed, which is connected between the oil pumps.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the lubricating oil is supplied to the lubricated portion of the transmission as the lubricating oil in the oil return passage. An oil heating device for a transmission is proposed, characterized in that a supply port is connected.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the heat exchange passage is arranged around a cylinder of the internal combustion engine. A characteristic oil heating device for a transmission is proposed.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the heat exchange passage is below the top surface at the bottom dead center of the piston slidably fitted into the cylinder. An oil heating device for a transmission, characterized in that it is arranged, is proposed.

  According to a sixth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the heat exchange passage is disposed in a cylinder head of the internal combustion engine. An oil heating device for a transmission is proposed.

  According to the invention described in claim 7, in addition to the configuration of any one of claims 1 to 6, the oil supply passage, the oil return passage, and the heat exchange passage include the internal combustion engine. An oil heating apparatus for a transmission is proposed, which is connected at a coupling surface between the engine and the transmission.

  According to the configuration of the first aspect, the oil pumped up from the oil reservoir of the transmission by the oil pump provided in the oil supply passage is supplied to the heat exchange passage disposed in the internal combustion engine, and the internal combustion engine is provided in the heat exchange passage. The oil whose temperature has been increased due to heat exchange is returned from the heat exchange passage to the oil reservoir or oil supply passage through the oil return passage, so that the oil in the transmission can be quickly discharged without interfering with the temperature rise of the cooling water after starting the internal combustion engine. The temperature can be raised and the power transmission efficiency of the transmission can be increased.

  According to the second aspect of the present invention, the downstream end of the oil return passage is connected between the filter provided at the upstream end of the oil supply passage and the oil pump on the downstream side thereof. The oil thus supplied is supplied again to the heat exchange passage without passing through the filter, and the load on the oil pump can be reduced by the amount of flow resistance of the filter.

  According to the third aspect of the present invention, the lubricating oil supply port for supplying the oil to the lubricated portion of the transmission as lubricating oil is connected to the oil return passage, so that the oil whose temperature has risen through the heat exchange passage is lubricated. It becomes possible to supply to a to-be-lubricated part as oil, and to lubricate a to-be-lubricated part effectively.

  According to the fourth aspect of the present invention, since the heat exchange passage is arranged around the cylinder of the internal combustion engine, not only the heat exchange passage can be easily formed, but also the oil is effectively heated by the combustion heat of the internal combustion engine. Can do.

  According to the fifth aspect of the present invention, since the heat exchange passage is disposed below the top surface at the bottom dead center of the piston slidably fitted to the cylinder, the heat exchange passage warms up the internal combustion engine. In addition to minimizing the hindrance, the oil temperature can be prevented from excessively rising after the warm-up operation of the internal combustion engine is completed.

  According to the sixth aspect of the present invention, since the heat exchange passage is arranged in the cylinder head of the internal combustion engine, not only the heat exchange passage can be easily formed, but also the oil can be more effectively heated by the combustion heat of the internal combustion engine. Can do. Moreover, the heat exchange passage can be shortened by forming the heat exchange passage in the cylinder head that is hotter than the cylinder block.

  According to the seventh aspect of the present invention, since the oil supply passage, the oil return passage, and the heat exchange passage are connected at the coupling surface between the internal combustion engine and the transmission, the connecting pipe is connected to the internal combustion engine or the transmission. The connection of the oil supply passage, the oil return passage, and the heat exchange passage can be completed only by connecting the internal combustion engine and the transmission at the connection surface without routing to the outside.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a view showing an oil heating device of a transmission, FIG. 2 is an enlarged view in two directions in FIG. 1, and FIG. FIG. 4 is an explanatory diagram of the effect of the present embodiment.

  As shown in FIGS. 1 to 3, an in-line multi-cylinder internal combustion engine E mounted on an automobile includes a plurality of cylinders 12 formed in a cylinder block 11, and includes a water so as to surround the cylinders 12. A jacket 13 is formed. The water jacket 13 is recessed from the deck surface 11 a of the cylinder block 11 toward the crankcase 14, and a partition member 15 is press-fitted in the vicinity of the bottom of the water jacket 13, so that the bottom of the water jacket 13 and the partition member 15 are pressed. A heat exchange passage 16 surrounding the periphery of the cylinders 12 is defined between the two. The height of the heat exchange passage 16 is set lower than the top surface 17a of the piston 17 at the bottom dead center.

  At the bottom of the transmission T connected to the internal combustion engine E, an oil reservoir 18 for storing oil that functions as hydraulic oil and lubricating oil for the transmission T is provided. An oil supply passage 19 and an oil return passage 20 are arranged inside the transmission T.

  The upstream end of the oil supply passage 19 extends into the oil reservoir 18, and the downstream end thereof is connected to the upstream end of the heat exchange passage 16 at a point a of the coupling surface connecting the transmission T and the internal combustion engine E. In the oil supply passage 19, a branch portion 19 a to the filter 21, the oil pump 22, the control oil supply port 23 and a branch portion 19 b to the lubricating oil supply port 24 are arranged from the upstream side to the downstream side.

  The first oil return passage 20a of the oil return passage 20 is connected at its upstream end to the downstream end of the heat exchange passage 16 at point b of the coupling surface connecting the transmission T and the internal combustion engine E, from which the second oil return passage 20a is connected. The passage branches into a passage 20 b and a third oil return passage 20 c and extends into the oil reservoir 18. A switching valve 25 composed of a solenoid valve is disposed at the branch portion, and an oil cooler 26 is provided in the third oil return passage 20c downstream of the switching valve 25.

  Next, the operation of the first embodiment of the present invention having the above configuration will be described.

  When the oil in the transmission T is at a low temperature immediately after the start of the internal combustion engine E, the switching valve 25 moves the first oil return passage 20a of the oil return passage 20 through the second oil as shown in FIG. The oil pump 22 is operated in a state where it is connected to the return passage 20b, and the oil in the oil reservoir 18 of the transmission T is supplied to the filter 21 and the oil pump 22 of the oil supply passage 19, the heat exchange passage 16, and the oil return passage 20. The closed circuit returning to the oil reservoir 18 is circulated through the first oil return passage 20a, the switching valve 25 and the second oil return passage 20b.

  Since the cylinder block 11 of the internal combustion engine E quickly rises in temperature after starting, the oil passing through the heat exchange passage 16 disposed in the vicinity thereof is heated and heated up, and then returned to the oil reservoir 18. It is heated to an appropriate temperature during circulation. A part of the oil discharged from the oil pump 22 is supplied from the branch portion 19 a of the oil supply passage 19 to the control oil supply port 23 and used for the operation of the hydraulic control valve for shifting. The oil is supplied from the portion 19b to the lubricating oil supply port 24 and is used for lubrication of gears and clutches. During the warm-up operation of the internal combustion engine E, the oil returned from the heat exchange passage 16 to the oil return passage 20 has not yet sufficiently raised the temperature, so that the oil cooler 26 is bypassed and returned to the oil reservoir 18.

  After a predetermined time has elapsed after the internal combustion engine E is started and the oil temperature has sufficiently increased, the switching valve 25 connects the first oil return passage 20a of the oil return passage 20 to the third oil return passage 20c. Thus, the oil that has reached a high temperature passes through the oil cooler 26 and is cooled and then returned to the oil reservoir 18 to prevent deterioration due to overheating of the oil.

  As described above, since the oil of the transmission T is circulated through the heat exchange passage 16 provided in the cylinder block 11 of the internal combustion engine E and heated, the oil viscosity is adjusted to an appropriate value to transmit the power of the transmission T. While improving efficiency, it can prevent that abnormal abrasion generate | occur | produces in a sliding part.

  In addition, since a part of the water jacket 13 of the cylinder block 11 is partitioned by the partition member 15 to form the heat exchange passage 16, the heat exchange passage 16 can be easily formed. Moreover, since it is not necessary to provide piping for guiding oil and cooling water to the outside of the internal combustion engine E and the transmission T, the structure is simple. In particular, when the internal combustion engine E and the transmission T are coupled, heat exchange on the internal combustion engine E side is simplified. Since the passage 16 and the oil supply passage 19 and the oil return passage 20 on the transmission T side are automatically connected at points a and b, assembly is also easy.

  Further, since the oil in the transmission T does not exchange heat with the cooling water of the internal combustion engine E but exchanges heat with the cylinder block 11, the temperature of the cooling water before the completion of the warm-up operation of the internal combustion engine E is maintained. Not only can the oil be heated even when the temperature is low, but the temperature rise of the cooling water during the warm-up operation of the internal combustion engine E is prevented.

  Furthermore, since the heat exchange passage 16 is disposed below the top surface 17a at the bottom dead center of the piston 17 slidably fitted into the cylinders 12 ..., the heat exchange passage 16 causes the internal combustion engine E to While preventing the warm-up from being hindered, it is possible to prevent the oil temperature from rising excessively after the warm-up operation of the internal combustion engine E is completed.

  FIG. 4 shows changes in the cooling water temperature of the internal combustion engine E and the oil temperature of the transmission T during the cold start of the internal combustion engine E. Compared to that of the cited document 1 shown in FIG. It can be seen that the oil temperature can be quickly raised without affecting the temperature rise.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  The second embodiment (see FIG. 5) differs from the first embodiment (see FIG. 3) in the structure of the oil supply passage 19 and the oil return passage 20 of the transmission T. That is, in the first embodiment, the second oil return passage 20b of the oil return passage 20 is directly connected to the oil reservoir 18. However, in the second embodiment, the second oil return passage 20b is connected to the oil supply passage 19. Between the filter 21 and the oil pump 22. In the first embodiment, the branch portion 19b of the oil supply passage 19 to the lubricating oil supply port 24 provided downstream of the oil pump 22 is replaced with the second oil return passage 20b and the second oil return passage 20b in the second embodiment. 3 is provided in the oil return passage 20c (see the branch portion 20d).

  According to this embodiment, since the second oil return passage 20b is connected between the filter 21 and the oil pump 22 in the oil supply passage 19, the flow rate of the oil passing through the filter 21 is reduced and the flow resistance is reduced. As a result, the load of the driving force of the oil pump 22 can be reduced. Moreover, since the oil that has passed through the heat exchange passage 16 is supplied to the lubricating oil supply port 24, the transmission T is lubricated with the heated lubricating oil even immediately after the internal combustion engine E is started, and the power transmission efficiency is further increased. Can do.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment, separately from the water jacket 13 of the cylinder block 11, a groove surrounding the cylinders 12 from the crankcase 14 side is formed in the cylinder block 11 below the water jacket 13, and an opening portion of the groove is formed. Is closed by a partition member 15 to constitute a heat exchange passage 16. Also according to the third embodiment, it is possible to achieve the same effect as the first embodiment described above.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In the fourth embodiment, the heat exchange passage 16 is configured by burying pipe members surrounding the cylinders 12 when the cylinder block 11 is cast. Also according to the fourth embodiment, it is possible to achieve the same operational effects as those of the first embodiment described above.

  Next, a fifth embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the heat exchange passage 16 is formed so as to surround the cylinders 12 of the cylinder block 11, but in the fifth embodiment, the heat exchange passage 16 is an end portion on the transmission T side. An inverted U-shape is formed over both the cylinder block 11 and the cylinder head 27 closer to each other. According to the fifth embodiment, a part of the heat exchange passage 16 is disposed in the cylinder head 27 that heats up earlier than the cylinder block 11, thereby shortening the length of the heat exchange passage 16. The oil of the transmission T can be heated more quickly when the internal combustion engine E is started.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, although an in-line multi-cylinder engine is illustrated as the internal combustion engine E in the embodiment, the present invention can be applied to any other type of internal combustion engine.

The figure which shows the heating apparatus of the oil of the transmission which concerns on 1st Embodiment. 2 direction enlarged view of FIG. Circuit diagram of oil heating device Explanatory drawing of the effect of this embodiment The figure corresponding to the said FIG. 3 based on 2nd Embodiment. The figure corresponding to the said FIG. 2 based on 3rd Embodiment The figure corresponding to the said FIG. 2 based on 4th Embodiment The figure corresponding to the said FIG. 1 based on 5th Embodiment Explanatory drawing of effects of conventional example

Explanation of symbols

12 Cylinder 16 Heat Exchange Passage 17 Piston 17a Top 18 Oil Reservoir 19 Oil Supply Passage 20 Oil Return Passage 21 Filter 22 Oil Pump 24 Lubricating Oil Supply Port 27 Cylinder Head E Internal Combustion Engine T Transmission

Claims (7)

In an oil heating device for a transmission that heats oil in a transmission (T) connected to an internal combustion engine (E),
A heat exchange passage (16) disposed inside the internal combustion engine (E) and through which oil of the transmission (T) circulates;
An oil supply passage (19) for supplying oil from an oil reservoir (18) of the transmission (T) to the heat exchange passage (16);
An oil return passage (20) for returning oil from the heat exchange passage (16) to the oil reservoir (18) or the oil supply passage (19);
An oil pump (22) disposed in the oil supply passage (19) for pumping oil from the oil reservoir (18);
An oil heating device for a transmission, comprising:   A filter (21) is provided at the upstream end of the oil supply passage (19), and the downstream end of the oil return passage (20) is connected to the filter (21) and the oil pump (22) of the oil supply passage (19). The oil heating device for a transmission according to claim 1, wherein the oil heating device is connected in between.   The lubricating oil supply port (24) for supplying the oil as lubricating oil to the lubricated part of the transmission (T) is connected to the oil return passage (20). 3. An oil heating device for a transmission as described in 2.   The transmission according to any one of claims 1 to 3, wherein the heat exchange passage (16) is arranged around a cylinder (12) of the internal combustion engine (E). Oil heating device.   The heat exchange passage (16) is disposed below a top surface (17a) at a bottom dead center of a piston (17) slidably fitted to the cylinder (12). Item 5. The oil heating device for a transmission according to Item 4.   The oil of a transmission according to any one of claims 1 to 3, wherein the heat exchange passage (16) is arranged in a cylinder head (27) of the internal combustion engine (E). Heating device.   The oil supply passage (19), the oil return passage (20), and the heat exchange passage (16) are connected to each other at a coupling surface between the internal combustion engine (E) and the transmission (T). An oil heating device for a transmission according to any one of claims 1 to 6.

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