JP6822157B2 - Oil temperature regulator - Google Patents

Description

The present invention relates to an oil temperature regulator.

Conventionally, an oil temperature adjusting device that adjusts each oil temperature by exchanging heat between the engine cooling water and the clutch operating oil and exchanging heat between the clutch operating oil and the gear oil has been known. (See, for example, Patent Document 1).

JP-A-2015-124803

However, Patent Document 1 does not disclose a specific structure for heat exchange between the clutch operating oil and the gear oil.

An object of the present invention is to provide an oil temperature adjusting device capable of efficiently exchanging heat between a clutch operating oil and a gear oil.

In the oil temperature adjusting device according to the present invention, a first storage unit in which the first oil is stored, a second storage unit in which the second oil is stored, and an oil pump from the first storage unit are used. The first oil that is sent back to the first storage portion circulates inside, and includes a pipe that repeats branching and merging in the second storage portion, and the first oil and the first oil via the pipe. Heat exchange is performed with the second oil.

According to the oil temperature adjusting device according to the present invention, heat exchange can be efficiently performed between the clutch operating oil and the gear oil.

A vertical sectional view showing an outline of a transmission equipped with an oil temperature adjusting device according to an embodiment of the present invention. The figure which shows the shape of the pipe arranged in the gear oil storage part The figure which shows the deformation example of the shape of a pipe

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below is an example, and the present invention is not limited to this embodiment.

First, the outline of the oil temperature adjusting device 100 according to the present invention will be described with reference to FIG. FIG. 1 is a vertical cross-sectional view showing an outline of a transmission 1 equipped with an oil temperature adjusting device 100 according to the present invention. In FIG. 1, the front-rear direction and the up-down direction of the transmission 1 are drawn. In the following description, the front side, the rear side, the upper side, and the lower side of the transmission 1 may be simply referred to as "front", "rear", "upper", and "lower", respectively.

The transmission 1 equipped with the oil temperature adjusting device 100 according to the present invention includes a torque converter housing 10, a clutch housing 20, and a transmission case 30.

The torque converter housing 10 is made of, for example, an aluminum alloy or an iron-based alloy, and has a bottomed tubular shape with an open front. The torque converter housing 10 has an internal space 10a. A torque converter (not shown) is arranged in the internal space 10a.

The pump impeller of the torque converter is connected to an engine (not shown) provided in front of the torque converter. The torque converter output shaft connected to the torque converter turbine runner extends rearward. The torque converter output shaft penetrates the rear end wall 10b of the torque converter housing 10 and extends into the clutch housing 20.

In FIG. 1, a through hole through which the torque converter output shaft penetrates, a bearing that supports the torque converter output shaft with respect to the rear end wall 10b, and the like are omitted. Further, the inside of the torque converter is filled with the clutch operating oil 2. The clutch operating oil 2 corresponds to the "first oil" of the present invention.

The clutch housing 20 is made of, for example, an aluminum alloy or an iron-based alloy, and has a bottomed tubular shape with an open front. The clutch housing 20 is bolted to the rear end wall 10b of the torque converter housing 10 via a flange (not shown) provided in the opening.

The clutch housing 20 has a sealed internal space 20a. A clutch (not shown) is arranged in the internal space 20a. The clutch is a hydraulically operated wet multi-plate clutch. The hydraulic oil for the clutch is the same clutch hydraulic oil 2 as the oil filled inside the torque converter.

The input shaft of the clutch is connected to the output shaft of the torque converter. The output shaft of the clutch penetrates the rear end wall 20b of the clutch housing 20 and extends into the transmission case 30.

In FIG. 1, a through hole through which the output shaft of the clutch penetrates, a bearing that supports the output shaft of the clutch with respect to the rear end wall 20b, and the like are omitted.

A clutch operating oil reservoir 20c is provided below the internal space 20a of the clutch housing 20. An oil pump 3 that sucks up and sends out the clutch operating oil 2 stored in the clutch operating oil reservoir 20c is embedded in the rear end wall 10b of the torque converter housing 10. The clutch operating oil reservoir 20c corresponds to the "first storage portion" of the present invention.

The oil pump 3 is rotationally driven by the engine. The oil pump 3 may be driven by another power source. As the oil pump 3, a widely known gear pump, trochoid pump, or the like can be adopted. The oil pump 3 is not limited to the above type.

The oil pump 3 sucks up the clutch operating oil 2 stored in the clutch operating oil reservoir 20c through the suction oil passage 3a provided inside the rear end wall 10b. The clutch operating oil 2 delivered from the oil pump 3 passes through a delivery oil passage 3b provided inside the rear end wall 10b and is sent to the heat exchanger 4.

Then, the heat exchanger 4 exchanges heat between the clutch operating oil 2 and the engine water cooling system. The engine water cooling system is typically cooling water that circulates in a cooling circuit for cooling the inside of the engine. The engine water cooling system maintains an appropriate temperature range (for example, about 80 ° C.) immediately after the engine is started.

Therefore, when the temperature of the clutch operating oil 2 is low, the clutch operating oil 2 is heated by heat exchange between the clutch operating oil 2 and the engine water cooling system, and the clutch operating oil 2 is heated to an appropriate temperature at an early stage. Can be done. Further, when the temperature of the clutch operating oil 2 becomes overheated, the temperature of the clutch operating oil 2 can be cooled to an appropriate temperature.

The clutch operating oil 2 that has passed through the heat exchanger 4 is sent to the heat exchange pipe 40 (details will be described later) arranged in the transmission case 30 via the second oil passage 3c. The second oil passage 3c is an external pipe provided outside the transmission 1. The second oil passage 3c is formed of a heat insulating pipe in order to maintain the temperature of the clutch operating oil 2 raised by the heat exchanger 4.

The transmission case 30 is made of, for example, an aluminum alloy or an iron-based alloy, and has a bottomed tubular shape with an open front. The transmission case 30 is bolted to the rear end wall 20b of the clutch housing 20 via a flange (not shown) provided in the opening. A component (not shown) is arranged in the transmission case 30.

The transmission case 30 has a sealed internal space 30a. A gear oil reservoir 30c in which the gear oil 5 is stored is provided below the internal space 30a. The gear oil 5 corresponds to the "second oil" of the present invention. Further, the gear oil reservoir 30c corresponds to the "second storage portion" of the present invention.

The heat exchange pipe 40 described above is arranged below the liquid level of the gear oil 5 stored in the gear oil reservoir 30c.

Next, the heat exchange pipe 40 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view of the heat exchange pipe 40 as viewed from above. In FIG. 2, the front-rear direction and the left-right direction of the transmission 1 are drawn. In FIG. 2, the gear oil 5 is not hatched for easy understanding.

The heat exchange pipe 40 is a pipe made of a metal having excellent thermal conductivity, such as copper. The internal space of the heat exchange pipe 40 forms an oil passage through which the clutch operating oil 2 flows.

The inlet portion 40a of the heat exchange pipe 40 is connected to the second oil passage 3c via the first in-wall oil passage 3d formed in the rear end wall 20b of the clutch housing 20. Specifically, the inlet portion 40a of the heat exchange pipe 40 is inserted into the oil passage 3d in the first wall surface and sealed.

The outlet portion 40b of the heat exchange pipe 40 is connected to one end of the oil passage 3e in the second wall surface formed on the rear end wall 20b of the clutch housing 20. Specifically, the outlet portion 40b of the heat exchange pipe 40 is inserted into the oil passage 3e in the second wall surface and sealed. The other end of the second wall surface oil passage 3e is open to the clutch operating oil reservoir 20c.

As shown in FIG. 2, the heat exchange pipe 40 extends rearward from the rear end wall 20b of the clutch housing 20, folds back in front of the rear end wall 30b of the transmission case 30 and extends forward, and extends to the rear end of the clutch housing 20. It reaches the wall 20b.

Further, the heat exchange pipe 40 has a shape in which the clutch operating oil 2 circulating inside repeats branching and merging. Specifically, the heat exchange pipe 40 includes a first pipe portion 41 extending from the front to the rear, a second pipe portion 42 extending from the front to the rear and to the right, and a third pipe portion 43 extending from the front to the rear and to the left. It is composed of a combination of.

Therefore, the flow of the clutch operating oil 2 is disturbed by branching at the branching point and merging at the merging point.

As a result, the flow velocity of the clutch operating oil 2 can be reduced, and the clutch operating oil 2 can be retained in the heat exchange pipe 40. Therefore, the heat exchange between the clutch operating oil 2 and the gear oil 5 performed via the heat exchange pipe 40 is promoted, and the gear oil 5 can be effectively heated by the clutch operating oil 2.

As described above, according to the present embodiment, the clutch operating oil 2 delivered from the clutch operating oil reservoir 20c circulates in the internal space of the heat exchange pipe 40 that repeats branching and merging in the gear oil reservoir 30c. It was configured to return to the clutch operating oil pool 20c. Then, heat exchange is performed between the clutch operating oil 2 and the gear oil 5 via the heat exchange pipe 40.

Therefore, the gear oil 5 can be efficiently heated by the clutch operating oil 2. In particular, since the flow velocity of the clutch operating oil 2 flowing through the heat exchange pipe 40 can be reduced and the clutch operating oil 2 can be retained in the heat exchange pipe 40, heat exchange between the clutch operating oil 2 and the gear oil 5 is promoted. can do.

Further, according to the present embodiment, the heat exchange pipe 40 is arranged on the downstream side of the heat exchanger 4, and after heat exchange is performed between the engine cooling water and the clutch operating oil 2, the clutch operating oil 2 is used. Heat exchange is performed with the gear oil 5.

As a result, the gear oil 5 can be heated by the clutch operating oil 2 which has been heated by the heat exchanger 4. Therefore, it is more effective than arranging the heat exchanger that exchanges heat between the clutch operating oil and the gear oil on the upstream side of the heat exchanger that exchanges heat between the engine cooling water and the clutch operating oil. It is possible to raise the temperature of the gear oil.

In the above-described embodiment, the heat exchange pipe 40 is provided with a first pipe portion 41 extending from the front to the rear, a second pipe portion 42 extending from the front to the rear and to the right, and a third pipe portion extending from the front to the rear and to the left. It is configured by combining the pipe portions 43, but is not limited to this.

Specifically, for example, as in the modified example shown in FIG. 3, the front-rear direction pipe portion 44 extending in the front-rear direction and the left-right direction pipe portion 45 extending in the left-right direction may be combined and configured. The orientation of each pipe portion is not limited to the above-described embodiment and modification. Further, the number of branching points and merging points is not limited to that of the above-described embodiment or modification.

Further, in the above-described embodiment, the heat exchange pipe 40 is repeatedly branched and merged, but in addition to this, the pressure loss of the oil passage is caused by at least partially narrowing the flow path diameter of the heat exchange pipe 40. May be further increased. By doing so, the clutch operating oil 2 can be retained in the heat exchange pipe 40 for a longer period of time.

Further, heat radiation fins may be provided on the outer surface of the heat exchange pipe 40. By doing so, it is possible to more effectively exchange heat between the clutch operating oil 2 and the gear oil 5.

Further, in the above-described embodiment, the description has been given by taking as an example the one including the torque converter housing 10, the clutch housing 20, and the transmission case 30, but the present invention is not limited thereto.

Specifically, for example, for a substantially cylindrical case, the internal space in which the torque converter is arranged, the internal space in which the clutch is arranged, and the internal space in which the transmission is arranged may be partitioned by partition walls.

Further, the torque converter may be omitted, and various types of clutches can be adopted as the clutch. Further, various types of components can be adopted as the components arranged in the internal space of the transmission case.

The oil temperature adjusting device of the present invention is suitably used for a transmission in which a plurality of types of oils are used.

1 Transmission 2 Clutch operating oil 3 Oil pump 3a Suction oil passage 3b Delivery oil passage 3c Second oil passage 3d First wall oil passage 3e Second wall oil passage 4 Heat exchanger 5 Gear oil 10 Torque converter housing 10a Internal space 10b Rear end wall 20 Clutch housing 20a Internal space 20b Rear end wall 20c Clutch operating oil pool 30 Transmission case 30a Internal space 30b Rear end wall 30c Gear oil pool 40 Heat exchange pipe 40a Inlet part 40b Outlet part 41 First pipe part 42 2nd pipe part 43 3rd pipe part 44 Front-rear direction pipe part 45 Left-right direction pipe part 100 Oil temperature regulator

Claims (3)

The first storage part where the first oil is stored and
A second reservoir where the second oil is stored and
A pipe is provided, wherein the first oil, which is sent from the first storage unit by an oil pump and returns to the first storage unit, circulates inside and repeats branching and merging in the second storage unit.
An oil temperature adjusting device in which heat exchange is performed between the first oil and the second oil via the pipe. The oil temperature adjusting device according to claim 1, wherein heat exchange is performed between the first oil and the external heat source, and then heat exchange is performed between the first oil and the second oil. The first storage portion is provided in the internal space of the clutch housing in which the clutch is housed, and the first oil is the operating oil of the clutch.
The second storage portion is provided in the internal space of the transmission case in which the transmission is housed, and the second oil is gear oil that lubricates the internal space of the transmission case. Or the oil temperature adjusting device according to 2.

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