JPS62233549A - Hydraulic controller for automatic transmission - Google Patents

Abstract

PURPOSE:To relieve the impact when performing 4-2 kickdown speed change by providing an oil path communicating between a third port of a third shift valve and a port adjoining to a first port of a first shift valve. CONSTITUTION:Under 2-speed, a solenoid valve 37 is turned on to close an oil path 48 and moves downward so as to communicate an oil path 41 through the ports 44, 45 with an oil path 42 thus functioning a brake B1 servo 500. Then, under 3-speed, the shift valve remains as it is to feed a pressure oil through an oil path 32 to a clutch C2, but since the area of a chamber 50 is larger than the operating area 50a of a piston 51, the brake B1 servo is disengaged. Under 4-speed, power is conducted to the solenoid valve 37 to lift 1-2 shift valve 100 so as to close the oil path 42, but 3-4 shift valve 300 moves downward to feed a pressure oil to the oil path 28a of a clutch C3 so as to communicate the ports 29, 45 of the valve 100 thus feeding a pressure oil to B1 servo chamber 50. Since B1 servo pressure oil is not drained even under 4-speed, the impact is relieved when performing 4-2 kickdown speed change.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a hydraulic control device for a four-speed automatic transmission.

(Prior Art) In a conventional electronically controlled 4-speed automatic transmission, the 1-2 shift valve and the 2-3 shift valve each have a control solenoid valve, and the two shift valves are switched by operating the solenoid valves. It is configured to operate a 3-4 shift pulp by a hydraulic signal, and due to the configuration of the valve,
At high speeds, the supply pressure to the B1 brake is drained.

To explain the movement of this valve according to Table 1, the "↑" mark in Table 1 indicates that the shift valve spool is moving upwards, and the "↓" mark indicates that the spool is moving downwards. The ↑ mark indicates the state in which the shift valve spool is up, and the "↓" mark indicates the state in which the spool is in the downward position.

Therefore, during a 4-2 shift, pressure is supplied to the B3 brake and B1 brake at the same time, which requires a large amount of oil, which takes time to shift, and makes it difficult to adjust the timing when shifting. Ga power/vine.

The conventional 4-speed type engagement table is shown in Table 2.

In Table 2, cl, C2, C3 are clutches, Bl, B2. B3
indicates the brake, F indicates the one-way clutch, ○ indicates the operating state, and - indicates the non-operating state.

(Problems to be Solved by the Invention) The present invention solves the problems in the 4-2 shift in conventional 4-speed automatic transmissions, makes sure that Bl oil pressure is sufficient even during 4th shift, and This was intended to alleviate the shock of the times.

[Structure of the invention]

(Means for solving the problem) For this reason, the present invention has three shift valves, and among the shift valves, ? An oil path connects the shift valves p and x and a servo that achieves the second speed through its first port, and
A hydraulic circuit having an oil passage connecting a third shift valve to a servo that achieves a fourth speed, and an oil passage that connects a third shift valve and a servo that achieves a fourth speed through the third port, An oil passage is provided to connect the first port of the first shift valve to an adjacent port, and this is used as a means to solve the problem.

(Function) The drain of the oil passage supplying to B1 via the 1-2 shift pulp is communicated with the oil passage supplying C3 via the 3-4 shift pulp, and conversely, the oil pressure is drained to 03. When being supplied, pressure oil is supplied to B1 via the 1-2 shift pulp.

(Example) An example of the present invention will be described below with reference to the drawings. The drawing is a hydraulic circuit diagram showing an example of the present invention.

First, the structure of the automatic transmission body will be explained with reference to the figure. Reference numeral 1 denotes an input shaft of the automatic transmission linked to the engine. Torque is transmitted to the input shaft 3 of the transmission body via the torque converter 2, and then to the CI clutch drum 4. be done. When the C1 clutch is engaged, the signal is input to the front ring gear 5, and when the C2 clutch is engaged, the signal is input to the sun gear 6, which is common to both the front and rear.

Further, when the B1 brake is engaged, the sun gear 6 is fixed to the case of the automatic transmission, and when the B2 brake or the one-way clutch F is engaged, the rear carrier 7 is fixed. The front carrier 8 and the rear ring gear 9 are integrally connected via an output shaft 10 of a three-speed automatic transmission.

11 indicates a 4-speed section, and the output shaft 10 of the 3-speed section is connected via a gear pair 12. Furthermore, when the B3 brake is engaged, the sun gear 16 is fixed to the automatic transmission case, and when the C3 clutch is engaged, the sun gear 16 and carrier 14 rotate together.

The above is a general explanation of automatic transmissions, but next, the features of the present invention will be explained with reference to the embodiment circuit of the drawings. 100 is a 1-2 shift pulp, 200 is a 2-3 shift pulp. , 300 indicates 3-4 shift pulp. This 3-4 shift pulp 300 has a spool 17 inside the valve body, and lands 17a, 17b, 17c.
is provided, and the spool 17 is urged upward by a spring 18.

The pulp body and lands 17a, 17b, 17
I-) 19, which is formed by c, is in communication with the port 20 of the 1-2 shift valve 100 via an oil passage 21, and the port 22 is in communication with the line pressure from V through an oil passage 23. The Ushida port 24 communicates with the B3 brake 26 via an oil passage 25, and the port 27 communicates with a drain port. Furthermore, the port 27a communicates with the port 29 of the 1-2 shift valve 100 via an oil passage 28, and with the C3 clutch 30 via an oil passage 28a. ;
The f-to 31 is connected to the 2-3 shift pulp 20 via an oil path 32.
The port 34 communicates with the port 36 of the 2-3 shift pulp 200 via an oil passage 35. 37 and 38 are solenoid pulps, the solenoid pulp 38 is a closed type (oil passage is closed when not energized), and the solenoid pulp 37 is an open type (oil passage is opened when not energized).

Now, oil from the oil pump 40 passes through the oil path 23.39 to the manual pulp 400.3-4 shift pulp 30.
0, is supplied to the solenoid 37, 38, and is supplied to the oil passage 41 by the movement of the manual pulp 400, and the oil passage 41 is connected to the 1-2 shift valve 100. 2-3 shift pulp 200 and the chamber of C1. . Depending on the position of the 1-2 shift pulp 100, the oil passage 41 supplies oil pressure to the oil passage 42 or 21, and depending on the position of the 2-3 shift pulp 200, the oil passage 41 supplies oil pressure to the oil passage 35 or 32. Depending on the position of the 3-4 shift pulp 300, it is selected whether to supply from the oil passage 23 to the oil passage 25 or from the oil passage 32 to the oil passage 28a.

The oil passage 42 is connected to the B1 servo 500, and in the 1-2 shift valve 100, it is connected to the oil passage 41;
-) 44 and the port 45 located between the port 29 connected to the oil passage 28a. Also, depending on the position of the 1-2 shift pulp spool 46, the oil passages 41 to 42, 4
7 or from the oil passage 28a to the oil passages 42 and 47.

Now, since the 1-2 shift pulp 100 is energized in the 1st speed state, the pulp of the solenoid pulp 37 is lifted upward and the fluid in the oil passage 48 is drained, so the pressure decreases to about 0 and the spool 46 is lifted upward by the bias of the spring 49, and the oil passage 41 of the D range line is communicated with the port 19 as a relay signal oil pressure of the 3-4 shift valve 200 via N-) 44.20. There is.

When the pressure is applied to the 2nd range, the solenoid pulp 37 is energized and closes the oil passage, so the oil passage 48 becomes line pressure, moves downward against the spring 49, and the oil passage 41 becomes po) 44 .45 to the oil passage 42, and is guided to the B1 servo to form the 2nd. Further, the 1-2 shift valve in the 3rd state is the same as the 2nd shift valve, and continues to be supplied to the B1 servo.

However, from the 2-3 shift pulp 200, the C
The hydraulic pressure is supplied to the chamber 50 of the B1 servo, but the hydraulic pressure is in communication with the chamber 50 of the B1 servo, and since the area of the chamber 50 is larger than the chamber operating area 50a of the B1 servo piston 51, the Bl servo is not maintained. 3rd
is formed. Also, in 4th gear, 1-2 shift pulp 100
However, since the solenoid pulp 37 is energized and moves upward, the oil path 42 from the oil path 41 to the B1 servo is blocked, but since the 3-4 shift pulp 300 moves downward, the oil to C3 is cut off. Pressure oil is supplied to the passage 28a, and 1
The port 29 of the -2 shift pulp ioo communicates with the port 45, and pressure oil is supplied to the B1 servo chamber 50.

〔Effect of the invention〕

Since the present invention is configured as explained in detail above,
Make sure that the B1 servo oil pressure does not leak out even during 4th, 4
-2 The hr hydraulic control system is designed to reduce the shock during kick-down gear shifting, but does not allow the user to feel an unpleasant shock during gear shifting.

[Brief explanation of drawings]

The drawing is a hydraulic control circuit diagram showing an embodiment of the present invention. Description of main parts of figures 21.23, 25, 28.28a, 32, 35, 39,
41゜42.47.48...Oil path 37.38...Tulenoid pulp 19.20, 21, 27, 29, 31, 33, 44
．． 45・・・・・・・・・;N-to 46...
...Spool 100 ...1-2 Shift pulp 200 ...2-3 Shift valve 300 ・3
-4 Shift Valve 400...Manual Pulp 500...B1 Cerbony 2 Procedural Amendment May 15, 1985 Director General of the Patent Office Michibe Uga 1, Case Indication Patent Application 1988 -73707 No. 3, Relationship with the person making the amendment Patent applicant name (001) Aisin Seiki Co., Ltd. 4, Agent 6, Full text of the specification to be amended 7, Contents of the amendment

Claims (1)

[Claims] A hydraulic circuit for a four-speed automatic transmission, which has three shift valves, and connects a first shift valve among the shift valves to a servo that achieves the second speed through its first port. An oil passage connects a second shift valve and a servo that achieves third speed through its second port; an oil passage that achieves fourth speed through a third shift valve and its third port; Hydraulic pressure of an automatic transmission, characterized in that the hydraulic circuit has an oil passage connecting to a servo, and an oil passage connecting the third port and a port adjacent to the first port of the first shift valve is provided. Control device.