JP2013113406A - Vehicle transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle transmission that can supply a hydraulic fluid after a temperature rise immediately to a part in need of the hydraulic fluid.SOLUTION: A vehicle transmission includes an oil pan 25 storing a hydraulic fluid ATF; an oil strainer 26 filtering the hydraulic fluid ATF stored in the oil pan 25; an oil pump 27 sucking the hydraulic fluid ATF through the oil strainer 26; and a hydraulic fluid heating means (oil heater) 30A located near the oil strainer 26 to heat the hydraulic fluid ATF sucked into the oil pump 27.

Description

  The present invention relates to a vehicle transmission provided with hydraulic oil heating means for heating hydraulic oil.

2. Description of the Related Art Conventionally, there is known a vehicle transmission including an oil warmer that communicates with a downstream oil passage downstream of a control valve unit, and an oil pump that selectively communicates with an upstream and downstream oil passage of the control valve unit. (For example, refer to Patent Document 1).
In this vehicle transmission, when the hydraulic oil temperature is low, the oil pump communicates with the downstream oil passage, and the hydraulic oil discharged from the oil pump flows into the oil warmer to actively raise the hydraulic oil temperature. To do.

JP 2006-307950 A

However, in the conventional vehicle transmission, it is not possible to quickly supply the heated hydraulic oil to the portion where the hydraulic oil is necessary.
That is, in the conventional vehicle transmission, the hydraulic oil stored in the oil pan is sucked up by the oil pump, and then supplied to the oil warmer to be heated. Therefore, it takes time for the hydraulic oil to reach the oil warmer, and it takes time until the temperature rises. As a result, it takes time until the heated hydraulic oil is supplied to the location where the hydraulic oil is required.

  The present invention has been made paying attention to the above-described problem, and an object of the present invention is to provide a vehicle transmission that can quickly supply the operating oil after the temperature rise to the position where the operating oil is required.

In order to achieve the above object, the vehicle transmission of the present invention includes an oil pan, an oil strainer, an oil pump, and hydraulic oil heating means.
The oil pan stores hydraulic oil.
The oil strainer filters the hydraulic oil stored in the oil pan.
The oil pump sucks hydraulic oil through the oil strainer.
The hydraulic oil heating means is located in the vicinity of the oil strainer and heats the hydraulic oil sucked into the oil pump.

  In the vehicle transmission of the present invention, the hydraulic oil sucked into the oil pump through the oil strainer is heated by the hydraulic oil heating means. For this reason, the hydraulic oil discharged from the oil pump is heated. As a result, it is possible to quickly supply the operating oil after the temperature rise to the place where the operating oil is required.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system block diagram illustrating a main configuration of an FF hybrid vehicle including a vehicle transmission according to a first embodiment. It is explanatory drawing which shows the principal part structure of the transmission for vehicles of Example 1. FIG. 3 is a flowchart showing a flow of hydraulic oil heating processing executed in the vehicle transmission according to the first embodiment. It is explanatory drawing which shows the principal part structure of the transmission for vehicles of Example 2. FIG. FIG. 6 is an explanatory diagram illustrating a main configuration of a vehicle transmission according to a third embodiment. FIG. 10 is an explanatory diagram showing a main configuration of a vehicle transmission according to a fourth embodiment. (a) is explanatory drawing which shows the principal part structure of the transmission for vehicles of Example 5, (b) is principal part sectional drawing of Fig.7 (a). FIG. 6 is an explanatory diagram illustrating a configuration of a main part of a vehicle transmission according to another example of the first embodiment. (a) is explanatory drawing which shows the principal part structure of the transmission for vehicles of the other example of Example 5, (b) is principal part sectional drawing of Fig.9 (a).

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the transmission for vehicles of this invention is demonstrated based on Example 1-5 shown in drawing.

First, the configuration will be described.
The configuration of the vehicle transmission according to the first embodiment will be described by being divided into “entire system configuration”, “oil heater arrangement configuration”, and “hydraulic oil heating process”.

[General system configuration]
FIG. 1 is a system block diagram illustrating a main configuration of an FF hybrid vehicle including the vehicle transmission according to the first embodiment. The overall system configuration of the vehicle transmission will be described below with reference to FIG.

  The vehicle transmission of the first embodiment is mounted on an FF hybrid vehicle. Here, as shown in FIG. 1, the FF hybrid vehicle includes an engine 1, an electric drive unit (vehicle transmission) 2, and drive wheels (not shown).

  The engine 1 is a gasoline engine or a diesel engine, and performs engine start control, engine stop control, valve opening control of a throttle valve, fuel cut control, and the like. Further, the engine 1 is provided with a starter motor 1a that is a dedicated motor for starting the engine 1.

  The electric drive unit 2 includes a first clutch 21, a motor / generator 22, a belt-type continuously variable transmission mechanism 23, and a hydraulic oil circulation system 24.

  The first clutch 21 is a clutch interposed between the engine 1 and the motor / generator 22. Engagement to release is controlled by a first clutch hydraulic pressure generated by a control valve 28 described later.

  The motor / generator 22 is a synchronous motor / generator in which a permanent magnet is embedded in a rotor and a stator coil is wound around a stator. Driving is performed by applying a three-phase alternating current generated by the inverter 22a. Here, the motor / generator 22 operates as an electric motor that is driven to rotate by receiving power supplied from the high-voltage battery 22b via the inverter 22a (power running). When the rotor of the motor / generator 22 receives rotational energy from the engine 1 or a driving wheel (not shown), the motor / generator 22 functions as a generator that generates electromotive force at both ends of the stator coil. 22b is charged (regeneration).

  The belt type continuously variable transmission mechanism 23 determines a target input rotational speed in accordance with the vehicle speed VSP and the accelerator opening APO, and automatically changes the stepless speed ratio. In this belt type continuously variable transmission mechanism 23, a gear ratio that is a belt winding diameter ratio around two pulleys is controlled by a primary hydraulic pressure and a secondary hydraulic pressure generated by a control valve 28 described later. A differential output (not shown) is connected to the transmission output shaft 23a of the belt type continuously variable transmission mechanism 23, and left and right drive wheels are provided from the differential via left and right drive shafts.

The hydraulic oil circulation system 24 is a system that circulates hydraulic oil in the electric drive unit 2. Here, the hydraulic oil ATF (Automatic Transmission Fluid) is used for the operation of a clutch and a brake for switching forward / reverse movement, in addition to the engagement / disengagement operation of the first clutch 21 and the transmission operation of the belt-type continuously variable transmission mechanism 23, It has functions such as lubrication to prevent seizure of rotating parts and cooling of heat generated from belts, clutches and brakes.
The hydraulic oil circulation system 24 includes an oil pan 25, an oil strainer 26, an oil pump 27, a control valve 28, and an oil heater (hydraulic oil heating means) 30.

  The oil pan 25 is attached to the lower surface in the vertical direction of the belt-type continuously variable transmission mechanism 23 and stores hydraulic oil ATF.

  The oil strainer 26 has a filter function of filtering the hydraulic oil stored in the oil pan 25 and is disposed inside the oil pan 25. The oil strainer 26 communicates with an inflow opening 26a facing the bottom surface 25a of the oil pan 25, an inflow pipe 26b (see FIG. 2) through which hydraulic oil ATF flows from the inflow opening 26a, and an intake port 27a of the oil pump 27. Thus, an outflow pipe 26c (see FIG. 2) through which the hydraulic oil ATF flows out, and an oil filter 26d (see FIG. 2) provided between the inflow pipe 26b and the outflow pipe 26c are provided.

  The oil pump 27 sucks the hydraulic oil ATF in the oil pan 25 from the suction port 27 a through the oil strainer 26 and supplies the hydraulic oil ATF discharged from the discharge port 27 b to the control valve 28. The oil pump 27 is connected to the input shaft 22c of the motor / generator 22 via a chain drive mechanism 27c, and is disposed in the vicinity of the input shaft 22c. The oil pump 27 is driven by transmitting the rotational driving torque of the input shaft 22c via the chain driving mechanism 27c.

The control valve 28 adjusts the hydraulic pressure of the high-pressure hydraulic oil ATF discharged from the oil pump 27 to create a line pressure (original pressure), and requires hydraulic oil such as the first clutch 21 and the belt-type continuously variable transmission mechanism 23. Supply hydraulic oil ATF to the location. Since a large amount of drain is generated in the control valve 28 when adjusting the hydraulic pressure, the control valve 28 is provided inside the oil pan 25 and close to the oil strainer 26.
The control valve 28 includes a control valve body 28a (see FIG. 2) in which a large number of oil passages are formed, a spool set in which a spool and a spring are combined, a solenoid, a step motor, an accumulator, an orifice, and other components. Is incorporated and formed. At this time, a part of each part is attached from the outside of the control valve body 28a by the control valve bolt 28b (see FIG. 2).

  The oil heater 30 is located near the oil strainer 26 and heats the hydraulic oil ATF sucked into the oil pump 27. The oil heater 30 generates heat when supplied with electric power from the low voltage battery 30a.

Further, the hydraulic oil circulation system 24 includes a hydraulic oil temperature sensor 29A and a hydraulic pressure sensor 29B.
The hydraulic oil temperature sensor 29A detects the hydraulic oil temperature discharged from the oil pump 27. The hydraulic pressure sensor 29B detects the pressure of the line pressure created by the control valve 28.

[Oil heater arrangement]
FIG. 2 is an explanatory diagram illustrating a main configuration of the vehicle transmission according to the first embodiment.

As shown in FIG. 2, the oil heater 30 has a cylindrical shape, a heating portion 31 is provided at the tip, and a harness (not shown) connected to the low voltage battery 30 a is provided at the other end. The oil heater 30 is supported via a bracket 32 in the vicinity of the oil strainer 26 at least at a position where the heating unit 31 is always immersed in the hydraulic oil ATF stored in the oil pan 25. Accordingly, the oil heater 30 is disposed inside the oil pan 25 and heats the hydraulic oil ATF before flowing into the inflow pipe 26b of the oil strainer 26.
Here, the oil heater 30 is supported in a state where the heating unit 31 faces the inflow opening 26 a side of the oil strainer 26.

The bracket 32 has a heater support portion 32a that supports the oil heater 30, and a fixing portion 32b that is continuously fixed to the control valve 28 from the heater support portion 32a. Here, the fixing portion 32b is fixed by a control valve bolt 28b provided in the control valve body 28a.
That is, the bracket 32 is fastened together with various parts when the control valve bolt 28b is provided to attach various parts to the control valve body 28a.
Further, the oil heater 30 is disposed in the vicinity of the control valve 28 by fixing the bracket 32 to the control valve body 28a.

[Hydraulic oil heat treatment]
FIG. 3 is a flowchart illustrating the flow of the hydraulic oil heating process executed in the vehicle transmission according to the first embodiment.
Hereinafter, each step of FIG. 3 showing the hydraulic oil heating process will be described.

  In step S1, when it is detected that the pump drive of the oil pump 27 is started as the motor / generator 22 is driven, the hydraulic oil temperature sensor 29A and the hydraulic pressure sensor 29B are ON-controlled, and the process proceeds to step S2.

  In step S2, following the ON control of the hydraulic oil temperature sensor 29A and hydraulic oil pressure sensor 29B in step S1, the hydraulic oil temperature (Toil) discharged from the oil pump 27 is detected by the hydraulic oil temperature sensor 29A, and the process proceeds to step S3. To do.

In step S3, following the detection of the hydraulic oil temperature in step S2, it is determined whether or not the detected hydraulic oil temperature is equal to or lower than a preset oil temperature threshold A. If YES (Toil ≦ oil temperature threshold A), the process proceeds to step S4. If NO (Toil> oil temperature threshold A), the process proceeds to the end because it is not necessary to heat the hydraulic oil ATF.
Here, the oil temperature threshold A is, for example, a hydraulic oil temperature at which the first clutch 21 can be smoothly engaged and disengaged, and is set to an arbitrary value such as minus 30 ° C.

  In step S4, following the determination of Toil ≦ oil temperature threshold A in step S3, the oil heater 30 is ON-controlled with the hydraulic oil temperature being low, and the process proceeds to step S5.

  In step S5, following the ON control of the oil heater 30 in step S4, the pressure (Poil) of the line pressure created by the control valve 28 is detected by the hydraulic pressure sensor 29B, and the process proceeds to step S6.

In step S6, following the detection of the working oil pressure in step S5, it is determined whether or not the detected working oil pressure exceeds a preset oil pressure threshold value B. If YES (Poil> oil pressure threshold B), the process proceeds to step S7. If NO (Poil ≦ oil temperature threshold A), the process returns to step S4 because the hydraulic oil ATF is not sufficiently heated.
Here, the hydraulic pressure threshold B is, for example, a pressure that enables the first clutch 21 to be engaged, and is set to an arbitrary value.

  In step S7, following the determination that Poil> hydraulic pressure threshold B in step S6, the hydraulic oil temperature is sufficiently raised, the required oil pressure can be output, the oil heater 30 is turned off, and the process proceeds to the end.

  Next, the operation of raising the operating oil temperature of the vehicle transmission according to the first embodiment will be described.

[Operating temperature rise]
In the FF hybrid vehicle including the vehicle transmission of the first embodiment, when it is detected that the motor / generator 22 is driven and the pump driving of the oil pump 27 is started as the motor / generator 22 is driven, FIG. The process proceeds from step S1 to step S2 to step S3. Thereby, the hydraulic oil temperature discharged from the oil pump 27 is detected by the hydraulic oil temperature sensor 29A, and it is determined whether or not the detected hydraulic oil temperature is equal to or lower than the oil temperature threshold A. If the hydraulic oil temperature is equal to or lower than the oil temperature threshold A, the process proceeds to step S4 and the oil heater 30 is ON-controlled.

  When the oil heater 30 is turned on and the heating unit 31 generates heat and starts heating the hydraulic oil ATF in the oil pan 25, the process proceeds from step S5 to step S6 in the flowchart shown in FIG. Thus, the pressure of the line pressure produced by the control valve 28 is detected, and it is determined whether or not the detected line pressure exceeds the hydraulic pressure threshold B. If the operating oil pressure exceeds the oil pressure threshold B, the process proceeds to step S7, where the oil heater 30 is controlled to be OFF, and heating of the operating oil is stopped.

Here, the oil heater 30 is supported via a bracket 32 in the vicinity of the oil strainer 26 at a position where at least the heating unit 31 is always immersed in the hydraulic oil ATF stored in the oil pan 25. Accordingly, the hydraulic oil ATF is stored in the oil pan 25 and heated before flowing into the inflow pipe 26b of the oil strainer 26 by the oil heater 30.
That is, the hydraulic oil ATF stored in the oil pan 25 can be heated before being sucked into the oil pump 27 via the oil strainer 26.

  Then, the hydraulic oil ATF that has been heated before flowing into the oil strainer 26 is discharged from the oil pump 27 while being heated, and is supplied to the control valve 28. The control valve 28 adjusts the hydraulic pressure to produce a line pressure (original pressure), and supplies the hydraulic oil whose temperature has been raised to places where the hydraulic oil is required, such as the first clutch 21 and the belt-type continuously variable transmission mechanism 23.

  As described above, in the vehicle transmission (electric drive unit 2) according to the first embodiment, the temperature of the hydraulic oil ATF is increased before being sucked into the oil pump 27. Therefore, the hydraulic oil ATF discharged from the oil pump 27 has already been heated. Will be. As a result, the hydraulic oil ATF whose temperature has been raised can be quickly supplied from the control valve 28 to the location where the hydraulic oil is required.

In the vehicle transmission of the first embodiment, the oil heater 30 is disposed inside the oil pan 25, and the hydraulic oil ATF before flowing into the inflow pipe 26b of the oil strainer 26 is heated by the oil heater 30.
Therefore, the degree of freedom of installation of the oil heater 30 is high, and the layout restriction is low. Further, since the hydraulic oil ATF can be heated without sacrificing the opening area of the inflow opening 26a, it is possible to prevent a reduction in the suction performance of the oil strainer 26.

In particular, in the vehicle transmission of the first embodiment, the oil heater 30 is supported by a bracket 32 fixed to the control valve 28 via a control valve bolt 28 b provided on the control valve 28.
Therefore, the bracket 32 is fastened together with various parts to be attached to the control valve 28 by the control valve bolt 28b. Thereby, the number of parts can be reduced.

Further, the oil heater 30 is positioned in the vicinity of the control valve 28 by fixing the bracket 32 to the control valve 28. For this reason, the control valve body 28 a is also heated by the heat of the oil heater 30. As a result, the portion where the oil heater 30 performs hydraulic control, that is, the portion that creates the line pressure is warmed directly.
That is, by supporting the oil heater 30 to the control valve 28 via the control valve bolt 28b, the hydraulic oil ATF before flowing into the inflow pipe 26b of the oil strainer 26 is heated and flows into the control valve 28. The hydraulic oil ATF can be heated. For this reason, the hydraulic oil ATF is heated before flowing into the oil strainer 26 and then heated again when flowing to the control valve 28. As a result, the hydraulic oil ATF is heated twice before being supplied from the control valve 28 to each required hydraulic pressure, so that the effect of increasing the oil temperature is enhanced and the hydraulic response can be improved.
Further, if the bracket 32 and the control valve bolt 28b are formed of a material having high heat conduction performance, the heat of the oil heater 30 is easily transmitted to the control valve body 28a, and the temperature rise effect of the hydraulic oil ATF in the control valve 28 is further increased. Can be increased.

Next, the effect will be described.
In the vehicle transmission according to the first embodiment, the following effects can be obtained.

(1) an oil pan 25 for storing hydraulic oil ATF;
An oil strainer 26 for filtering the hydraulic oil ATF stored in the oil pan 25;
An oil pump 27 for sucking hydraulic oil ATF through the oil strainer 26;
Hydraulic oil heating means (oil heater) 30 for heating the hydraulic oil ATF, which is located in the vicinity of the oil strainer 26 and sucked into the oil pump 27;
It was set as the structure provided with.
As a result, the hydraulic oil ATF whose temperature has been raised can be quickly supplied to the location where the hydraulic oil is required.

(2) The oil strainer 26 has an inflow pipe 26b through which the hydraulic oil ATF flows into the oil pan 25,
The hydraulic oil heating means 30 is arranged inside the oil pan 25 to heat the hydraulic oil ATF before flowing into the inflow pipe 26b.
As a result, the degree of freedom in installing the oil heater 30 is high, layout restrictions are reduced, the hydraulic oil ATF can be heated without sacrificing the opening area of the inflow opening 26a, and the suction performance of the oil strainer 26 can be reduced. Can be prevented.

(3) A control valve 28 for adjusting the hydraulic pressure of the hydraulic oil ATF discharged from the oil pump 27 is provided.
The hydraulic oil heating means 30 is configured to be supported by the control valve 28 via a control valve bolt 28 b provided on the control valve 28.
Thereby, together with the various parts attached to the control valve 28, the hydraulic oil heating means 30 can be fastened together by the control valve bolt 28b, and the number of parts can be reduced.

Example 2 is an example in which an oil heater is inserted and fixed from an oil pan.
FIG. 4 is an explanatory diagram illustrating a main configuration of the vehicle transmission according to the second embodiment.

As shown in FIG. 4, the oil heater 30 </ b> A according to the second embodiment has a cylindrical shape, and a heating unit 31 is provided at the tip, and a harness 31 a connected to the low voltage battery 30 a is provided at the other end. The oil heater 30 </ b> A passes through the bottom surface 25 a of the oil pan 25 in the vicinity of the oil strainer 26 and is supported by the bottom surface 25 a of the oil pan 25.
At this time, the oil heater 30 </ b> A is supported in a state where the heating unit 31 faces the inflow opening 26 a of the oil strainer 26. In addition, a sealing material (not shown) is provided between the oil heater 30A and the oil pan 25, thereby preventing hydraulic oil from leaking.

  In such a vehicle transmission according to the second embodiment, when the oil heater 30A is ON-controlled, the heating unit 31 generates heat to heat the hydraulic oil ATF.

Here, the oil heater 30A passes through the bottom surface 25a of the oil pan 25 and is supported by the bottom surface 25a. Therefore, the harness 31a extending from the oil heater 30A can be routed outside the oil pan 25.
In other words, since the harness 31a does not come into contact with the hydraulic oil ATF, the harness 31a does not need oil resistance and an insulation measure is facilitated.

  In the second embodiment, the heating unit 31 of the oil heater 30 </ b> A faces the inflow opening 26 a of the oil strainer 26, so that the hydraulic oil ATF immediately before being sucked into the oil strainer 26 can be heated. Therefore, the heating efficiency can be improved.

  That is, the effects listed below can be obtained in the vehicle transmission of the second embodiment.

(4) The hydraulic oil heating means (oil heater) 30A is configured to pass through the oil pan 25 and be supported by the bottom surface 25a of the oil pan 25.
Thereby, the oil resistance performance of the harness 31a extended from the hydraulic oil heating means 30A becomes unnecessary, and the insulation measure can be facilitated.

Example 3 is an example in which an oil heater is fixed to a level gauge.
FIG. 5 is an explanatory diagram illustrating a main configuration of the vehicle transmission according to the third embodiment.

The vehicle transmission according to the third embodiment includes a level gauge 35 that detects the amount of hydraulic oil ATF stored in the oil pan 25.
The level gauge 35 is a so-called dipstick type level gauge in which the tip is immersed in the hydraulic oil ATF in the oil pan 25, and the tip is in contact with the hydraulic oil ATF.

  And the oil heater 30B of Example 3 is exhibiting a sheet | seat shape, as shown in FIG. 5, and is wound around the front-end | tip part of the level gauge 35, and is being fixed. At this time, the heating unit 31 formed on one surface is fixed so as to face the outside (the hydraulic oil ATF side).

  In such a vehicle transmission of the third embodiment, when the oil heater 30B is ON-controlled, the heating unit 31 generates heat and heats the hydraulic oil ATF.

  Here, since the oil heater 30B is wound around and fixed to the level gauge 35, the oil heater 30B can move integrally with the level gauge 35. That is, when the level gauge 35 is pulled out from the oil pan 25, the oil heater 30B is also pulled out from the oil pan 25. For this reason, the maintenance of the oil heater 30B can be easily performed.

That is, the effects listed below can be obtained in the vehicle transmission according to the third embodiment.
(5) A level gauge 35 for detecting the amount of hydraulic oil ATF stored in the oil pan 25 is provided.
The hydraulic oil heating means (oil heater) 30B is provided in the level gauge 35.
Thereby, the hydraulic oil heating means 30B can be pulled out from the oil pan 25 together with the level gauge 35, and the maintenance performance of the hydraulic oil heating means 30B can be improved.

Example 4 is an example in which the oil heater is fixed to the outside of the bottom surface of the oil pan.
FIG. 6 is an explanatory diagram illustrating a main configuration of the vehicle transmission according to the fourth embodiment.

  As shown in FIG. 6, the oil heater 30 </ b> C according to the fourth embodiment has a sheet shape and is attached to the outer surface of the bottom surface 25 a of the oil pan 25. At this time, the heating unit 31 formed on one surface is fixed so as to face the oil pan 25 side. The oil heater 30 </ b> C is disposed at a position where the inflow opening 26 a of the oil strainer 26 facing the bottom surface 25 a of the oil pan 25 faces.

  In the vehicle transmission of the fourth embodiment, when the oil heater 30C is ON-controlled, the heating unit 31 generates heat and heats the outer surface of the oil pan 25.

  Then, the outer surface of the oil pan 25 is heated, so that the hydraulic oil ATF stored in the oil pan 25 is heated. That is, the oil heater 30C heats the hydraulic oil ATF before flowing from the outside of the oil pan 25 into the inflow pipe 26b of the oil strainer 26.

Accordingly, the oil heater 30C can be heated without directly contacting the hydraulic oil ATF, and the oil heater 30C does not need oil resistance. In addition, a harness (not shown) for connecting the oil heater 30C and the low voltage battery does not need oil resistance, and insulation measures are facilitated.
Further, since the oil heater 30C heats the oil pan 25 itself, the heat from the oil heater 30C is efficiently transmitted to the entire hydraulic oil ATF stored in the oil pan 25, and can be efficiently heated.

  In particular, in the fourth embodiment, the oil heater 30C is disposed at a position where the inflow opening 26a of the oil strainer 26 facing the bottom surface 25a of the oil pan 25 is opposed. That is, the oil heater 30C is positioned directly below the inflow opening 26a of the oil strainer 26. For this reason, the heating efficiency by the oil heater 30C can be further improved.

  That is, the effects listed below can be obtained in the vehicle transmission of the fourth embodiment.

(6) The oil strainer 26 has an inflow pipe 26b through which the hydraulic oil ATF flows into the oil pan 25,
The hydraulic oil heating means (oil heater) 30C is attached to the outer surface of the oil pan 25 and heats the hydraulic oil ATF before flowing into the inflow pipe 26b.
Thereby, the hydraulic oil heating means 30C does not need oil resistance and can be easily installed.

(7) The hydraulic oil heating means (oil heater) 30C is provided at a position facing the inflow opening 26a of the inflow pipe 26b.
Thereby, the heating efficiency of the hydraulic oil ATF in the oil pan 25 can be improved.

Example 5 is an example in which the oil heater is disposed inside the inflow pipe of the oil strainer.
FIG. 7 (a) is an explanatory view showing a main part configuration of the vehicle transmission of the fifth embodiment, and FIG. 7 (b) is a main part sectional view of FIG. 7 (a).

  As shown in FIG. 7, the oil heater 30 </ b> D of the fifth embodiment has a sheet shape and is attached along the inner peripheral surface of the inflow pipe 26 b of the oil strainer 26. At this time, the heating unit 31 formed on one surface is fixed so as to face the inside of the inflow pipe 26b. The oil heater 30 </ b> D has a heat insulating layer 33 on the back side of the heating unit 31. Therefore, the heat insulating layer 33 is interposed between the oil heater 30D and the oil strainer 26.

  In such a vehicle transmission of the fifth embodiment, when the oil heater 30D is ON-controlled, the heating unit 31 generates heat and heats the hydraulic oil ATF that has flowed into the inflow pipe 26b of the oil strainer 26.

As a result, only the hydraulic oil ATF that has flowed into the oil strainer 26 can be intensively heated, and a necessary temperature increase can be achieved in a short time.
Further, since the oil heater 30D is attached to the inner surface of the inflow pipe 26b, the heated hydraulic oil ATF is sucked into the oil strainer 26 and is prevented from diffusing into the oil pan 25. For this reason, the temperature rising effect of the hydraulic oil ATF can be further enhanced.

Furthermore, in the fifth embodiment, the oil heater 30D has a heat insulating layer 33 on the back side of the heating unit 31, and the heat insulating layer 33 is interposed between the oil heater 30D and the oil strainer 26.
Therefore, the heat from the oil heater 30D can stay inside the inflow pipe 26b without diffusing, and the temperature rise effect of the hydraulic oil ATF can be further enhanced. That is, the heat of the oil heater 30D is transmitted to the hydraulic oil ATF inside the oil strainer 26, and the temperature rise effect is improved.

  As described above, in the vehicle transmission according to the fifth embodiment, the effects listed below can be obtained.

(8) The oil strainer 26 has an inflow pipe 26b through which the hydraulic oil ATF flows into the oil pan 25,
The hydraulic oil heating means (oil heater) 30D is configured to heat the hydraulic oil ATF after flowing into the inflow pipe 26b.
As a result, only the hydraulic oil ATF that has flowed into the oil strainer 26 can be intensively heated, and a necessary temperature increase can be achieved in a short time.

(9) The hydraulic oil heating means (oil heater) 30D is provided along the inner peripheral surface of the inflow pipe 26b.
Thus, the heated hydraulic oil ATF is prevented from diffusing into the oil pan 25, and the temperature rise effect of the hydraulic oil ATF can be further enhanced.

(10) The hydraulic oil heating means (oil heater) 30D has a heat insulating layer 33 on the back side of the surface on which the heating unit 31 is provided.
For this reason, the heat of the oil heater 30D is transmitted to the hydraulic oil ATF inside the oil strainer 26, and the temperature rise effect can be improved.

  As mentioned above, although the vehicle transmission of this invention was demonstrated based on Example 1- Example 5, it is not restricted to these Examples about a concrete structure, Each claim of a claim Design changes and additions are permitted without departing from the spirit of the invention.

  In the first embodiment, an example in which the oil heater 30 is fixed to the control valve 28 via the bracket 32 is shown. However, the present invention is not limited to this. For example, as shown in FIG. 8, a cylindrical oil heater 30 </ b> E may be fixed on the bottom surface 25 a of the oil pan 25 via a bracket (not shown). At this time, in FIG. 8, in order to prevent interference between the inflow pipe 26b of the oil strainer 26 and the oil heater 30E, the oil heater 30E is arranged so that the extending direction of the inflow pipe 26b and the axial direction of the oil heater 30E are orthogonal to each other. Has been. Further, in order to improve the heating efficiency, the heating part 31 of the oil heater 30E is disposed immediately below the inflow opening 26a of the inflow pipe 26b.

  Then, as shown in FIG. 8, by disposing the oil heater 30E on the bottom surface 25a of the oil pan 25, the hydraulic oil ATF is heated without affecting the hydraulic oil suction efficiency of the oil strainer 26. Can do.

Since the position where the oil heater 30E is disposed needs to be changed according to the position of the inflow opening 26a of the oil strainer 26, the oil heater 30E may be fixed to the side surface 25b of the oil pan 25, for example.
Further, the oil heater 30E may be arranged so that the extending direction of the inflow pipe 26b coincides with the axial direction.

  In the second embodiment, an example in which the oil heater 30A penetrating the bottom surface 25a of the oil pan 25 is supported by the oil pan 25 is not limited thereto, but the oil heater 30A penetrates the side surface 25b of the oil pan 25. However, the oil heater 30A may be supported by the side surface 25b.

  In the fifth embodiment, the sheet-like oil heater 30D is provided along the inner peripheral surface of the inflow pipe 26b of the oil strainer 26. However, the present invention is not limited to this. As shown in FIG. 9, the sheet-like oil heater 30F may be attached along the outer peripheral surface of the inflow pipe 26b so as to cover the outside of the inflow pipe 26b.

  Even in this case, the oil heater 30F is disposed between the inflow pipe 26b and the outflow pipe 26c, and heats the hydraulic oil ATF after flowing into the inflow pipe 26b. As a result, only the hydraulic oil ATF that has flowed into the oil strainer 26 can be intensively heated, and a necessary temperature increase can be achieved in a short time.

  Further, by covering the outer surface of the oil heater 30F, that is, the back side of the heating unit 31, with the heat insulating layer 33, heat diffusion from the oil heater 30F is prevented and heat is transmitted to the hydraulic oil ATF inside the oil strainer 26. It is possible to improve the temperature rise effect.

Further, in the first embodiment, the oil heater 30 is supplied with power from the low voltage battery 30a, and thus can be driven stably while ensuring both safety and reliability. Not exclusively. For example, the oil heater 30 may be driven by receiving power supply from the high voltage battery 22 b that supplies power to the motor / generator 22. In this case, an oil heater with a high calorific value can be used.
When the vehicle transmission of the present invention is applied to a plug-in hybrid vehicle, the oil heater 30 may be driven by receiving power from an external power source such as a household power source. Even in this case, since a high output can be realized, an oil heater having a high calorific value can be used.

And in Example 3 etc., although the oil heater 30B which exhibits a sheet | seat shape is used, not only this but the oil heater which consists of a heating wire may be sufficient. In this case, the oil heater can be manufactured at low cost.
The hydraulic oil heating means may be a so-called oil warmer that heats hydraulic oil by heat exchange with, for example, engine cooling water, instead of an oil heater.

In the first embodiment, when the line pressure exceeds the oil pressure threshold B, the oil heater 30 is controlled to be OFF. At this time, the line pressure is monitored by the operating oil pressure sensor 29B. However, the present invention is not limited to this. For example, the output line pressure may be estimated from the hydraulic oil temperature when the oil pump 27 is started, the outside air temperature, and the operating time of the oil heater 30.
In this case, the hydraulic pressure sensor 29B is not necessary.

  Also, the oil heater control does not turn off the oil heater according to the line pressure, but until the temperature of the hydraulic oil ATF reaches a preset target hydraulic oil temperature, that is, while the hydraulic oil temperature is low, The oil heater may be continuously driven. In this case, the required hydraulic oil temperature can be maintained. Further, the oil heater may be turned off according to the remaining amount of the battery that supplies power to the oil heater.

  Furthermore, as the oil pump 27, in each of the above-described embodiments, a mechanical oil pump driven by the input shaft 22c of the motor / generator 22 via the chain drive mechanism 27c is used. However, an electric oil pump having an electric motor is used. It may be.

  And in Example 1, the example which applies the transmission for vehicles of the present invention to FF hybrid vehicles was shown. However, the vehicle transmission of the present invention is not limited to a hybrid vehicle, and can be applied to any vehicle including a transmission such as an engine vehicle, an electric vehicle, or a fuel cell vehicle.

1 Engine 2 Electric drive unit (Vehicle transmission)
21 First clutch 22 Motor / generator 23 Belt type continuously variable transmission mechanism 24 Hydraulic oil circulation system 25 Oil pan 26 Oil strainer 26a Inflow opening 26b Inflow pipe 26c Outflow pipe 26d Oil filter 27 Oil pump 28 Control valve 28a Control valve body 28b Control Valve bolt 29A Hydraulic oil temperature sensor 29B Hydraulic oil sensor 30 Oil heater (hydraulic oil heating means)

Claims (11)

An oil pan for storing hydraulic oil;
An oil strainer for filtering the hydraulic oil stored in the oil pan;
An oil pump that draws hydraulic oil through the oil strainer;
A hydraulic oil heating means located near the oil strainer for heating the hydraulic oil sucked into the oil pump;
A vehicle transmission comprising: The vehicle transmission according to claim 1,
The oil strainer has an inflow pipe through which the hydraulic oil flows into the oil pan,
The vehicle oil transmission, wherein the hydraulic oil heating means is disposed inside the oil pan and heats the hydraulic oil before flowing into the inflow pipe. In the vehicle transmission according to claim 2,
A control valve for adjusting the hydraulic pressure of the hydraulic oil discharged from the oil pump;
The vehicle transmission is characterized in that the hydraulic oil heating means is supported by the control valve via a control valve bolt provided in the control valve. In the vehicle transmission according to claim 2,
The transmission for a vehicle, wherein the hydraulic oil heating means penetrates the oil pan and is supported by a bottom surface or a side surface of the oil pan. In the vehicle transmission according to claim 2,
A level gauge for detecting the amount of hydraulic oil stored in the oil pan;
The hydraulic transmission is characterized in that the hydraulic oil heating means is provided in the level gauge. The vehicle transmission according to claim 1,
The oil strainer has an inflow pipe through which the hydraulic oil flows into the oil pan,
The vehicle transmission is characterized in that the hydraulic oil heating means is attached to an outer surface of the oil pan and heats hydraulic oil before flowing into the inflow pipe. The vehicle transmission according to claim 6, wherein
The vehicle transmission is characterized in that the hydraulic oil heating means is provided at a position facing the inflow opening of the inflow pipe. The vehicle transmission according to claim 1,
The oil strainer has an inflow pipe through which the hydraulic oil flows into the oil pan,
The vehicular transmission, wherein the hydraulic oil heating means heats the hydraulic oil after flowing into the inflow pipe. The vehicle transmission according to claim 8, wherein
The vehicle transmission is characterized in that the hydraulic oil heating means is provided along an inner peripheral surface of the inflow pipe. The vehicle transmission according to claim 8, wherein
The vehicle transmission is characterized in that the hydraulic oil heating means is provided along an outer peripheral surface of the inflow pipe. In the vehicle transmission according to claim 9 or 10,
The hydraulic oil heating unit includes a heat insulating layer on a back surface side of a surface provided with a heating unit.