JPS62233548A - Hydraulic controller for automatic transmission - Google Patents

Abstract

PURPOSE:To enable 3-4 speed change only with a hydraulic signal by adding another shift valve to an advance 3-speed transmission having two shift valves and functioning with a hydraulic relay signal for the latter. CONSTITUTION:A shift valve 300 for 3-4 speed change is added to the shift valves 100, 200 for 1-2 and 2-3 speed change. First speed is achieved by turning a solenoid 37 off while turning a solenoid 38 on, second speed is achieved by turning said solenoids 37, 38 on and third speed is achieved by turning the solenoid 37 on while turning the solenoid 38 off. When both solenoids 37, 38 are turned off, the shift valve 100 is shifted upward while the shift valve 200 is shifted downward and 3-4 shift valve 300 is subjected to a line pressure from an oil path 21 of the shift valve 100 to move downward thereby an oil path 32 is communicated with C3 clutch 30 to provide the fourth speed. In such a manner, when providing a shift valve additionally, 3-4 speed change can be executed without requiring an additional solenoid, resulting in a highly reliable speed change control.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a hydraulic control device for an automatic transmission that adds one speed to a three-speed forward automatic transmission to form a four-speed automatic transmission. be.

(Prior Art) The electronically controlled four-speed automatic transmission shown in U.S. Pat. No. 4,346,626 uses two solenoids, one of which communicates with the 2-3 shift valve, and the other The pulp is communicated with the 1-2 shift valve and the 3-4 shift valve, and the 0N-01 of each solenoid is connected.
``F operates to form 1st to 4th gears.

However, in the conventional case, a 3-speed automatic transmission and a 3-speed + 1-speed automatic transmission are used.
In order to construct a four-speed automatic transmission, it is necessary to provide a pulp body that constitutes the entirety of each of the first to third speeds and the fourth speed, which has the drawback of increasing costs.

Conventional 3-speed type engagement tables and 4-speed type engagement tables are shown in Tables 1 and 2.

Table 1 Table 2 However, in Tables 1 and 2, C1, C2, C3 are clutches, Bl, B2. B3 is a brake, F is a one-way clutch, ○ mark is an operating state, - mark is a non-operating state.

(Problems to be Solved by the Invention) In order to configure a 4-speed automatic transmission using a conventional automatic transmission, it is necessary to provide valve bodies for 1st to 3rd speeds and 4th speed. Therefore, the present invention was proposed to solve this problem.

[Structure of the invention]

(Means for Solving the Problems) Therefore, the present invention provides an automatic transmission with three forward speeds, which has two shift valves, and each of the shift valves has a solenoid device. Add two shift valves i~, so that the one shift valve is actuated by the hydraulic relay signals of the two shift valves.
．． The automatic transmission hydraulic control circuit has four forward speeds, and is intended as a means of solving the problem.

(Function) By simply adding the 3-4 shift valve unit to the 3-speed pulp body, the control signal pressure of the -2 shift valve and 2-3 shift valve is guided to the 3-4 shift valve through three oil passages, Pressure is communicated to the 3-4 shift valve to operate it, and its output oil pressure is guided to the 03 clutch or B3 brake to form a 4-speed type.

(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. 1 is the engine and the transmission 1. On the input shaft of an automatic transmission,
The torque is transmitted to the input shaft 3 of the transmission body via the torque converter 2, and further transmitted to the C1 clutch drum 4. When the C1 clutch is engaged, the signal is input to the planetary front ring gear 5, and when the C2 clutch is engaged, the signal is input to the sun gear 6 common to 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 rear ring gear 9 are integrally connected via a 1° output shaft of a 3-speed automatic transmission.

, 11 indicates a 4-speed section, the output shaft lO of the 3-speed section is inputted to the ring gear 13 of the 4-speed planetary via a gear pair 12, and the carrier 14 is connected to the output shaft 15 of the automatic raising machine. . The sun gear 16 is still fixed to the automatic transmission case when the B3 brake is engaged, and the sun gear 16 and the carrier 4 rotate together when the C3 clutch is engaged.

The above is a general explanation of automatic transmissions.Next, the features of the present invention will be explained with reference to an embodiment circuit of the drawings. 100 is a 1-2 shift valve, 200 is a 2-3 shift valve, indicates a 3-4 shift valve. The configuration of this 3-4 shift valve 300 has a spool 17 inside the valve body, and lands 17a, t7b,
1.7c is provided, and the spool 17 is biased in both directions by a spring 18.

The valve body and lands 17a, 17b, 17
The port 22 is formed by the line pressure from the D/P and the oil passage 23. It's communicating. Further, the port 24 communicates with the B3 brake 26 via an 'l-oil passage 25, and the port 27 communicates with a drain port. Furthermore, the port 27a is connected to the chamber 2 of the 1-2 shift valve 100 via the oil passage 28.
9 and communicates with the C3 clutch 30 via an oil passage 28a. :f knee) 31 is connected to 2- through the oil passage 32.
3 communicates with port 33 of shift valve 200, port 3
4 is the $- of the 2-3 shift valve 200 via the oil passage 35.
) 36.

37.38 is a solenoid valve, solenoid valve 3
8 is a closed type (oil passage is closed when not energized), solenoid valve 37 is an open type (oil passage is opened when not energized), and the shift signal is still at 2nd time i, L1 2 shift valve 100 downwards, 2-3.3-4 Shift valves 2oo, 3ooi, j: Located above, the B3 brake 26 engages as in the 1st, and the B1 servo 50
0 operates and stops the rotation of sun gear 6. 3rd time 1
-2.2-3 Shift valves 100° and 200 are both downward,
3-4 shift valve 300 is located above, 1st, 2n
Similarly to time d, the B3 brake 26 is engaged, and
C2 clutch 600 is activated, and sun gear 6 and ring gear 5 rotate at the same time.

Also, at the 4th time, the 1-2 shift valve 100 is upward, and the 2-2 shift valve 100 is upward.
The 3-4 shift valve 200 is located below, and the 3-4 shift valve 300 communicates line pressure with the oil passage 21 from the 1-2 shift valve 100, pushing the 3-4 shift valve 300 downward, and the 2-3 shift valve 200 Line pressure oil passage 32
is connected to the 03 clutch 30 from the oil passage 28a via the port 31.27a, and the C3 clutch is engaged,
The oil passage 25 leading to the B3 brake 26 is connected to port 24.27.
Since the water is drained through the B3 brake 26, it is forced to disengage.

Therefore, the 3-4 shift valve 300 is operated only by the oil pressure signals of the 1-2 and 2-3 shift valves 100 and 200.
4-speed shifting becomes possible, and if the 3-4 shift valve 300 is removed, it becomes a 3-speed automatic transmission hydraulic control circuit. Cut 3
If the -4 shift valve 300 is added, the 4-speed automatic transmission hydraulic control circuit will be activated, so there is no need for a shift solenoid in the 3-4 shift valve 300.

〔Effect of the invention〕

Since the present invention is configured as explained in detail above,
The other shift valve enables 3-4 speed shifting using only the hydraulic signals from the two shift valves, and if the other shift valve is removed, it becomes the 3-speed automatic transmission hydraulic control circuit, and the other shift valve If you add this, the 4-speed automatic transmission hydraulic control circuit will be activated, so there is no need for a solenoid for the other shift valve. Therefore, a 4-speed automatic transmission can be constructed that is lightweight, compact, and low cost. Since there is no need to operate two shift valves with one solenoid as in the conventional method, highly reliable shift control becomes possible.

[Brief explanation of drawings]

The drawing is a hydraulic circuit diagram showing an embodiment of the present invention. Description of main parts of figures 21.23, 25, 28.28a, 32, 35.39-
--Oil passage 26...B3 brake 30...C3 clutch 3738...Solenoid 100...1
-2 shift valve 200...2-3 shift valve
300...3-4 Shift Pulve Procedure Amendment May 15, 1986 Mr. Michibe Uga, Commissioner of the Patent Office■, Indication of the Case Patent Application No. 1988-6173706 2゜ Title of Invention Hydraulic Control Device for Automatic Transmission 3, 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 (1) Amend the handwritten specification to a typewritten version as shown in the attached sheet (There are no amendments to the content).

Claims (1)

[Claims] In an automatic transmission with three forward speeds, which has two shift valves, each of which has a solenoid device, another shift valve is added, and the hydraulic relay signals of the two shift valves are activated. A hydraulic control device for an automatic transmission, comprising an automatic transmission hydraulic control circuit for four forward speeds, which operates the one shift valve.