JP3228030B2 - Cooling and lubrication equipment in automatic transmissions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cooling and lubrication system for an automatic transmission.

[0002]

2. Description of the Related Art In a hydraulic circuit of an automatic transmission, a method of cooling and lubricating hydraulic oil is disclosed in, for example,
Japanese Patent Application Laid-Open No. 260767 discloses a cooling circuit and a lubricating circuit provided in parallel.
No. 872, two lubrication circuits are provided,
It is known that a cooling circuit is provided in series in one of them.

[0003]

However, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 60-260767, a desired amount is required for each of the cooling flow rate and the lubricating flow rate. Therefore, a large-capacity oil pump having a large discharge rate is required. Is required, and there is a problem that the driving force of the oil pump is increased, which results in deterioration of fuel efficiency. In the apparatus disclosed in Japanese Patent Laid-Open No. 1-24872, the above-mentioned problem can be avoided, but conversely, the circuit configuration becomes complicated due to the two lubrication circuits, and the flow distribution to each lubrication circuit is appropriately adjusted. There is a problem that must be. In view of the above problems, the present invention does not require an oil pump having a large discharge amount, and has a simple circuit configuration to turn on lock-up.
It is an object of the present invention to provide a cooling and lubricating device for an automatic transmission that can secure an appropriate cooling flow rate and lubricating flow rate regardless of / OFF.

[0004]

According to the first aspect of the present invention, cooling of the hydraulic oil supplied according to the original pressure regulated by the pressure regulating valve and cooling in the automatic transmission used for lubrication. And a lubrication device, a cooling circuit for cooling the hydraulic oil, a lubrication circuit connected in series with the cooling circuit downstream to lubricate the frictional engagement element, and an oil upstream of the cooling circuit bypassing the cooling circuit. A bypass circuit for connecting the oil passage to the lubrication circuit, and an oil passage for switching the engagement / disengagement of the lock-up clutch, switching of the oil passage to the cooling circuit, and switching of the oil passage in the bypass circuit. And a lock-up control valve for changing the cooling flow rate and the lubricating flow rate. According to a second aspect of the present invention, there is provided the cooling and lubricating device in the automatic transmission according to the first aspect, wherein the pressure regulating valve regulates a source pressure using a pressure immediately before the lubrication circuit as a signal pressure. You.

[0005]

According to the first aspect of the present invention, the lock-up control valve changes the oil passage to the cooling circuit and the oil passage through which the hydraulic oil in the bypass circuit passes according to the engagement and disengagement of the lock-up clutch. The cooling flow rate and the lubricating flow rate at the time of release and the cooling flow rate and the lubricating flow rate at the time of releasing the lock-up clutch are made appropriate. In claim 2, the pressure regulating valve further adjusts the original pressure by utilizing the pressure of the hydraulic oil immediately before the lubrication circuit.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 conceptually shows the configuration of the embodiment of the present invention. Reference numeral 1 denotes an oil pan, which receives the hydraulic oil that has been drained from each part and returned. Reference numeral 2 denotes a strainer, which filters the hydraulic oil sucked by the oil pump 3 and distributed again to each part. The hydraulic oil sent from the oil pump 3 is delivered to the friction engagement elements 4 by the primary line 100 as needed.

The primary line 100 is provided with a primary regulator valve 5. The primary regulator valve 5 drains a part of the hydraulic oil introduced from the inlet port 5a from the drain port 5b and returns it to the oil pan 1 so as to return to the primary line 10.
While adjusting the oil pressure at 0
c to the secondary line 200.

A secondary regulator valve 6 has a body 7 having first to sixth ports 7a to 7f and a spool 8 having first to third lands 8a to 8c and moving inside the body 7. The spool 8 includes a spring 9 that constantly biases the spool 8 in the upward direction in the figure. The secondary regulator valve 6 is connected to the secondary line 20
A part of the hydraulic oil passing through the second port 7b is introduced from the second port 7b and drained from the fifth port 7e as necessary, thereby performing pressure regulation, thereby serving as a pressure regulating valve in the present invention. Hydraulic oil is supplied from the four ports 7d to an auxiliary lubrication circuit or the like for lubricating a differential (not shown). In addition, 30 is an orifice.

Hereinafter, the pressure regulation of the secondary regulator valve 6 will be described. Since the first port 7a is connected to a second connection oil passage 600 connecting the oil cooler 20 and the main lubrication circuit 21 to be described later, and a third connection oil passage 700, the hydraulic pressure is equal to that introduced to the main lubrication circuit 21. Acts on the upper surface of the first land 8a of the spool 8 and pushes down the spool 8 against the urging force of the spring 9 and the upward force by the hydraulic pressure acting on the lower surface of the third land 8c. The opening area of the fifth port 7e increases as the hydraulic pressure increases, and the amount of drained oil increases to decrease the hydraulic pressure of the secondary line 200. Conversely, the opening area of the fifth port 7e decreases as the hydraulic pressure decreases. The hydraulic pressure of the hydraulic oil introduced into the main lubrication circuit 21 is always properly maintained because the oil amount to be drained is reduced and the hydraulic pressure of the secondary line 200 is increased.

On the other hand, a hydraulic pressure corresponding to the engine output, for example, hydraulic oil regulated by a throttle valve (not shown) is supplied to the sixth port 7f. This hydraulic oil acts on the lower surface of the third land 8c of the spool 8, and the spring 9
The spool 8 is pushed up together with the urging force of. And, as the engine output is higher and the supply hydraulic pressure is higher, the fifth port 7e
The opening area of the fifth port 7e is increased as the opening area of the fifth port 7e is reduced and the engine output is lower and the supply oil pressure is lower. Therefore, the oil pressure of the secondary line 200 is adjusted according to the engine output.

Reference numeral 10 denotes a lock-up relay valve of a conventional type, which comprises a body 11 having first to tenth ports, 11a to 11j, first to fifth lands, and 12a to 12e.
The lock-up relay valve 10 includes a spool 12 that moves inside the body 11 and a spring 13 that constantly urges the spool 12 upward in the drawing.
Since the oil passage is switched to engage and disengage the lock-up clutch, the oil passage to the oil cooler 20 and the oil passage in the bypass circuit are switched, the role of the lock-up control valve in the present invention is achieved. Has formed.

When the lock-up is ON, the first port 11
a on the upper surface of the first land 12a of the spool 12,
A signal oil pressure that pushes the spool 12 downward in the figure acts, and the spool 12 is in a state shown on the right side of the center line in the figure. When the lock-up is OFF, the signal oil pressure becomes 0, and a signal that pushes the spool 12 downward in the figure. Since the hydraulic pressure stops working, the spring 13
, The spool 12 is brought into a state shown on the left side of the center line in the figure. In the ON state, the second port 11b and the third port 11c are connected to the fourth port 11d and the fifth port 11d.
Port 11e is the sixth port 11f and the seventh port 11g
However, the eighth port 11h communicates with the ninth port 11i,
In the FF state, the third port 11c and the fourth port 11d
The seventh port 11g and the eighth port 11h communicate internally. The second port 11b, the fifth port 11e, the seventh port
The port 11g is connected to the secondary line 200, and the second port 11b is connected through the orifice 31.

Reference numeral 14 denotes a torque converter, which includes a converter cover 15, a pump 16, a turbine 17, a stator 18, a lock-up clutch 19, and the like. 14a and 14e respectively represent the torque converter 1
4 are the first oil passage and the second oil passage, respectively, the eighth port 11h and the fourth port 1 of the lock-up relay valve 10.
1d, when the lock-up is OFF, the first oil passage 14a serves as a hydraulic oil introduction passage, and the second oil passage 14e
When the lock-up is ON, on the contrary, the second oil passage oil passage 14e serves as a hydraulic oil introduction passage, and the first oil passage 1
4a is a discharge path. Reference numeral 14b denotes a first formed between the converter cover 15 and the lock-up clutch 19.
The oil chamber 14c is provided with the lock-up clutch 19 and the turbine 1
7 is a second oil chamber formed between the second oil chamber 7 and the outer surface of the second oil chamber 7. Reference numeral 14d denotes a converter chamber including a pump 16, a turbine 17, and a stator 18. 20 is an oil cooler, 21 is a main lubrication circuit, and is a cooling circuit and a lubrication circuit in the present invention, respectively, which are connected by a second connection oil passage 600. The auxiliary lubrication circuit to which the hydraulic oil sent from the third port 7c and the fourth port 7d of the secondary regulator valve is supplied is not included in the lubrication circuit of the present invention.

An oil passage 300 communicates the third port 11c of the lock-up relay valve 10 with the oil cooler 20. Reference numeral 400 denotes a first bypass line, which is a secondary line 200, an oil cooler 20, and a main lubrication circuit 2.
The orifice 32 is provided in the middle of the second oil passage 600 communicating with the first oil passage 600. A second bypass line 500 communicates the sixth port 11f of the lock-up relay valve 10 with the first bypass line 400, and an orifice 33 is provided in the middle thereof.

Next, the flow of hydraulic oil after the secondary regulator valve 6 in the hydraulic circuit of the present invention configured as described above will be described. First, the flow of hydraulic oil from point A upstream of the lock-up relay valve 10 to point B downstream of the main lubrication circuit 21 when the lock-up is OFF will be described. Second port 11b of lock-up relay valve 10 from secondary line 200 via orifice 31
The hydraulic oil introduced into the spool 12 is the second land 12b of the spool 12.
The path to is blocked and does not proceed. Similarly, the hydraulic oil introduced into the fifth port 11e is blocked from going to the third land 12c and does not proceed beyond it.

However, the hydraulic oil introduced from the secondary line 200 to the seventh port 11g of the lock-up relay valve 10 then reaches the first oil passage 14a of the torque converter 14 via the eighth port 11h, 1
The converter chamber 14d passes through the oil chamber 14b and the second oil chamber 14c.
After passing through the upper opening to transmit torque by circulating between the pump 16, the turbine 17, and the stator 18, the stator 1
8 reaches the fourth port 11d of the lock-up relay valve 10 via the second oil passage 14e via the second oil passage 14e, and further reaches the oil cooler 20 from the third port 11c via the first connection oil passage 300, where it is cooled. After reaching the main lubrication circuit 21 through the second connection oil passage 600, the parts are lubricated and then drained to return to the oil pan. In addition, there is hydraulic oil from the secondary line 200 through the first bypass line 400, through the orifice 32, and reaching the inlet of the main lubrication circuit 21.

FIG. 2 shows the state A when the lock-up is OFF.
The flow of hydraulic oil from point B to point B is shown. In the figure, ● indicates that the vehicle is blocked from going and does not proceed further, and a downward arrow indicates that the oil is drained. As is clear from FIG. 2, in this case, the hydraulic oil cooled by the oil cooler 20 has passed through the inside of the torque converter 14. And, reaching the main lubrication circuit 21,
In addition to the cooled hydraulic oil, the hydraulic oil is restricted in flow rate by the orifice 32 and passes through the first bypass line 400.

Next, from the point A when the lock-up is ON, B
The flow of the hydraulic oil between the points will be described. Secondary line 2
Hydraulic oil introduced from 00 through the orifice 31 to the second port 11b of the lock-up relay valve 10 is:
After that, the oil reaches the oil cooler 20 from the third port 11c through the first connection oil passage 300, where the oil is cooled, and
After reaching the main lubrication circuit 21 via the connecting oil passage 600, lubrication is performed, and then the oil is drained and returned to the oil pan.

On the other hand, the hydraulic oil introduced from the secondary line 200 to the fifth port 11e reaches the second oil passage 14e of the torque converter 14 via the fourth port 11d, and enters the converter chamber 14d from below the stator 18 from there. Reaches the second oil chamber 14c from above, presses the lock-up clutch 19 against the cover plate 15, and partially
From the gap at the bottom of the oil chamber 14c, the oil enters the first oil passage 14a, and then the eighth port 11 of the lock-up relay valve 10
h, drained through the ninth port 11i. And
Secondary line 20 as same as lock-up OFF
0 through the first bypass line 400 orifice 32
There is hydraulic oil that reaches the inlet of the main lubrication circuit 21 via The hydraulic oil introduced from the secondary line 200 to the seventh port 11g passes through the sixth port 11f, passes through the second bypass line 500, and joins the hydraulic oil reaching the inlet of the main lubrication circuit 21 through the orifice 33. .

FIG. 3 shows the flow of hydraulic oil from point A to point B when the lock-up is ON. FIG.
In this case, as is apparent from FIG.
The hydraulic oil cooled by passing through the inside of the torque converter 14 does not pass through the second line 11 b of the lock-up relay valve 10 from the secondary line 200.
The flow through the third port 11c is regulated by the orifice 31. The lubrication circuit reaches the orifice 3 in addition to the cooled hydraulic oil.
Hydraulic oil whose flow rate is regulated by 2 and passes through the first bypass line 400 and hydraulic oil whose flow rate is regulated by the orifice 33 and passes through the second bypass line 500.

In this embodiment, as described above, a lubrication circuit is arranged in series downstream of the cooling circuit, and a bypass circuit of the cooling circuit is provided, so that cooling flow rate + bypass flow rate = lubrication flow rate. By switching the oil passage, the cooling flow rate and the bypass flow rate are changed by ON and OFF of the lockup, respectively, and the required cooling flow rate and lubrication flow rate are secured under the respective conditions. And
When the lock-up is OFF, which transmits fluid in the torque converter and generates a large amount of heat, the amount of oil that passes through the cooling circuit is increased to reduce the amount of oil that passes through the bypass circuit. When the lockup is small, the amount of oil passing through the cooling circuit is reduced and the amount of oil passing through the bypass circuit is increased. When the lock-up is ON, the flow rate of the first connecting oil passage leading to the cooling circuit is regulated by the orifice 31, and the lock-up ON and OFF.
The orifice 32 regulates the flow rate of the first bypass line 400 used at the time of the lock-up, and the orifice 33 regulates the flow rate of the second bypass line 500 used at the time of lock-up. Lockup ON by simple work of combining
The optimum cooling and lubricating flow rates can be secured under the respective conditions of OFF and OFF. Further, the oil pressure immediately before the lubrication circuit is fed back to the secondary regulator valve 6 as a signal pressure, and if the hydraulic oil pressure supplied to the lubrication circuit shifts, adjustment is made so as to correct the shift. Further, since the lock-up relay valve 10 of the conventional type is used, a dedicated valve is not required.

FIG. 4 shows a modification of the above-described embodiment. The fifth embodiment differs from the above-described embodiment in that the fifth port 11e of the lock-up relay valve is connected to the secondary line 2.
This is the point where the connection to the primary line 100 is made instead of 00. If it is desired to further increase the clutch engagement pressure when the lock-up is ON due to the adaptation of the lock-up clutch capacity, FIG.
Fifth port 1 of lock-up relay valve as shown in
1e may be connected to the primary line 100.

[0023]

According to the first aspect of the present invention, since the cooling circuit and the lubrication circuit are provided in series, the required discharge amount of the oil pump is reduced, and the oil pump having a large discharge amount is not required. In addition, a bypass circuit for bypassing the cooling circuit is provided, and an oil passage is switched by using a lock-up control valve in accordance with ON / OFF of the lock-up, so that the amount of oil passing through the cooling circuit and the bypass can be reduced. Since the amount of oil passing through the circuit is changed, it is possible to secure an appropriate cooling flow rate and lubricating flow rate in accordance with ON and OFF of lockup with a simple circuit configuration. Normally, the required lubrication flow rate is greater than the required cooling flow rate, so by using the bypass circuit as a supplement to the lubrication flow rate, the required lubrication flow rate can be secured without increasing the inflow pressure into the cooling circuit more than necessary. In addition, it is not necessary to increase the required pressure resistance of the cooling circuit and its connection part more than necessary. According to the second aspect, when the pressure of the hydraulic oil supplied to the lubricating circuit is deviated from a predetermined value due to a change in an environmental condition such as a leak flow rate such as an oil temperature or an operation state, the deviation is corrected. By operating the pressure regulating valve on the lubrication system, a stable lubricating oil pressure and a stable lubricating flow rate can be always secured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a flow of hydraulic oil when lock-up is OFF.

FIG. 3 is a diagram showing a flow of hydraulic oil when lock-up is ON.

FIG. 4 is a diagram showing a modification of the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil pan 2 ... Strainer 3 ... Oil pump 4 ... Friction engagement elements 5 ... Primary regulator valve 5a ... Primary regulator valve inlet port 5b ... Primary regulator valve drain port 5c ... Primary regulator valve outlet port 6 ... Secondary Regulator valve 7: Secondary regulator valve body 7a to 7f: Secondary regulator valve body first to sixth ports 8 ... Secondary regulator valve spool 8a to 8c: Secondary regulator valve spool first to third lands 9 ... Secondary regulator valve spring 10 Lock-up relay valve 11 Lock-up relay valve body 11 a to 11 j Lock-up relay valve body 1st to 1st 0 port 12: Spool of lock-up relay valve 12a to 12c: First to fifth lands of spool of lock-up relay valve 13: Spring of lock-up relay valve 14: Torque converter 14a: First oil path of torque converter 14b ... First oil chamber of torque converter 14c: second oil chamber of torque converter 14d: converter chamber of torque converter 14e: second oil path of torque converter 15: converter cover 16: pump 17: turbine 18: stator 19: lock-up clutch Reference Signs List 20 oil cooler 21 lubrication circuit 30, 31, 32, 33 orifice 100 primary line 200 secondary line 300 first connecting oil passage 400 first bypass line 500 second bypass line 600 second connecting oil Road 00 ... third connecting oil passage

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-204472 (JP, A) JP-A-60-260767 (JP, A) JP-A-1-2422872 (JP, A) JP-A-4- 92147 (JP, A) JP-A-4-191556 (JP, A) JP-A-2-209966 (JP, A) JP-A-4-71854 (JP, U) JP-A-2-80256 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 57/00-57/04 F16H 41/30

Claims (2)

(57) [Claims] 1. A cooling circuit for cooling hydraulic oil supplied according to a source pressure regulated by a pressure regulating valve and for cooling and lubricating a lubricating device in an automatic transmission used for lubrication. A lubrication circuit connected downstream of the cooling circuit in series with the cooling circuit for lubricating the frictional engagement element; a bypass circuit bypassing the cooling circuit and connecting an oil passage upstream of the cooling circuit to the lubrication circuit; In addition to switching the path to engage / disengage the lock-up clutch, switching the oil path to the cooling circuit,
And a lock-up control valve for switching an oil passage in a bypass circuit. 2. The cooling and lubricating device for an automatic transmission according to claim 1, wherein the pressure regulating valve regulates a source pressure by using a pressure immediately before the lubrication circuit as a signal oil pressure.