JPS60256652A - Oil pressure controlling device for automatic transmission - Google Patents

Abstract

PURPOSE:To enable a shift rod to be returned to a neutral position rapidly and securely by controlling a set of three-position oil pressure actuators by means of four solenoid selector valves and operating oil pressure actuators which drives said shift rod. CONSTITUTION:Three-position oil pressure actuators E operate n-pieces of shift rods separately. These three positions provide required shift positions and a neutral position. And, an n-input three-position operating shift control valve D controls the feed of oil to the oil pressure actuators E. A one-input n-output n-position operation selector control valve C is provide on the upper course side of this control valve D. Both of these control valves D, C are operated by three- position oil pressure actuators 18, 38 respectively. And, the oil pressure actuator 18 is controlled by two solenoid control valves 47, 48, while the oil pressure actuator 38 is controlled by two solenoid control valves 49, 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a hydraulic control device for an automatic transmission of a vehicle.

As an automatic transmission, for example, as shown in Japanese Patent Application Laid-Open No. 54-96659, a shift control valve with one manual operation, two outputs, and three positions is provided on the upstream side, and a select control valve with two manual operations, three outputs, and three positions is provided on the downstream side. It has been proposed that each control valve is actuated by a solenoid to control a hydraulic actuator that drives a shift rod. However, this means that the shift control valve and select control valve functions can only be used with two-position hydraulic actuators.
In order to ensure the neutral position of the shift rod, the position of the shift rod must be detected using a potentiometer, etc., and the shift rod must be positioned by disconnecting and connecting the hydraulic circuit, making it difficult to obtain highly accurate positioning. It is.

An object of the present invention is to perform a select operation and a shift operation of a shift rod using a three-position hydraulic actuator, so that a neutral position can be easily secured without requiring a feedback signal such as detecting the operating position of the shift rod. Hydraulic pressure of automatic transmission! The purpose of the present invention is to provide an eleven-part device.

[Configuration of the Invention] In order to achieve the above object, the configuration of the present invention provides a hydraulic control device for an automatic transmission in which a control valve is provided between a hydraulic power source and a hydraulic actuator that individually operates n shift rods. , the control valve consists of a 1-manpower n-output n-position operation select control valve inserted on the upstream side, and an n-input 3-position electrically operated shift control valve inserted on the downstream side, and each control valve has a゛The spool position is controlled by at least four electromagnetic switching valves via a hydraulic actuator connected to the end, and the operation of the hydraulic actuator connected to the shift rod is controlled, thereby adjusting the required shift position and neutral position. The position was carefully determined.

The present invention will be explained based on examples. As shown in FIG. 1, the hydraulic pressure 11I control device for an automatic transmission according to the present invention includes a hydraulic unit A, a control circuit B, I, IJIII valves C1D,
and a hydraulic actuator E. The hydraulic unit A includes a hydraulic pump 42 driven by an electric motor 11 [41] powered by an on-board battery, and oil in a tank 43 is sent to a pressure accumulator 46 via a check valve 45 by the hydraulic pump 42. When the pressure in the pressure accumulator 46 exceeds a predetermined pressure, the relief valve 44 opens, and the pressure oil from the hydraulic pump 42 flows through the relief valve 44 to the tank 4.
It is set to return to 3.

The control circuit B is composed of four electromagnetic switching valves 47 to 50,
This controls the operations of the hydraulic actuator 18 that operates the spool 5 of the select i control valve C to the 3rd position and the hydraulic actuator 38 that operates the spool 33 of the shift control valve to the 3rd position. The electromagnetic switching valves 47 to 50 are in the state shown when the solenoids 47a to 50a are demagnetized, and are switched from the state shown when the solenoids 47a to 50a are energized, and the pilot pressure from the pressure accumulator 46 acts on the spool. It looks like this.

The select control valve C is constructed by fitting a spool 5 into a valve chamber 36 of a housing 6, and this spool 5 is connected to a third-position electric hydraulic actuator 18. Hydraulic actuator 18 partitions chamber 16 with 9 small diameter cylinders;! The spool 5 is coupled to the small diameter piston 71, and the spool 5 is connected to the small diameter piston 71. An intermediate piston 72 protruding from the small diameter piston 71 is fitted into a cylindrical large diameter piston 73. Such a configuration is the same as that of the hydraulic actuator E described later, so a description thereof will be omitted.

The valve chamber 36 has three ports 1-8.1 connected to the pressure accumulator 46.
2.14, three ports connected to the tank 43 via a common passage 37, and adjacent to these ports 2 and 3.4, the port 1- is provided. The spool 5 has an annular groove 7 connected to the port 8 in the neutral position shown.
an annular groove 9 located between ports 8 and 12 and connected to passage 37; an annular groove 10 connected to port 12 and passage 3; an annular groove 13 located between ports 12 and 14 and connected to passage 37 and passage 4; The annular groove 15 is connected to the passage 37.

The shift control valve is constructed by fitting a spool 33 into a valve chamber 39, and the spool 33 is in the third position e and is operated by a hydraulic actuator 38. The valve chamber 39 has passages 2.3.
4 consecutive ports are provided, and three sets of ports 22-23, 26-27, 30-31 are provided. The spool 33 has a pair of annular grooves 21 and 24 connected to the passage 2 in the illustrated neutral position, and an annular groove 25 connected to the passage 3.
28, and an annular groove 29, 32 connected to the passage 4.

The hydraulic actuator E includes three hydraulic actuators: a hydraulic actuator 51 for driving the shift rod 54, a hydraulic actuator 52 for driving the shift rod 55, and a hydraulic actuator 53 for driving the shift rod 56. configured. When the shift rod 54 is moved upward from the neutral position shown in the figure, a reverse gear shift is achieved, and when it is moved downward, a first gear shift is achieved. Similarly, the shift rod 55 is 2
A gear shift or a third gear shift is achieved, and the shift rod 56 is adapted to achieve a fourth gear shift or a fifth gear shift.

The third electric hydraulic actuator 51 is a small diameter cylinder 58
A small-diameter piston 59 is fitted into the large-diameter cylinder 62, and a cylindrical large-diameter cylinder 61 is fitted into the large-diameter cylinder 62, respectively. Further, an intermediate piston 60 is fitted into the large diameter piston 61 and is abutted against or integrally formed with the small diameter piston 59. A small diameter piston 59 is coupled to the shift rod 54. When pressure oil is supplied from the pressure accumulator 46 to both the chamber 57 of the small-diameter cylinder 58 and the chamber 63 of the large-diameter cylinder 62, it is held at the neutral position shown. Although not shown, an intermediate chamber created between the pistons 61 and 59 when they are separated from each other is always connected to the tank 43.

Although the above-mentioned embodiment describes a control device operated by hydraulic pressure, the present invention is not limited to this, and it goes without saying that fluid pressure such as air pressure can be used instead of hydraulic pressure. .

Next, the operation of the device of the present invention will be explained. Control circuit B
Solenoids 478-50a of each electromagnetic control valve 47-50
indicates the operating position of the driver's selector lever 11P, R, N, D
, 2. It is selectively excited based on the output signal of a microcomputer that receives signals such as L, vehicle speed, engine rotational speed, and load. That is, the pressure oil in the pressure accumulator 46 when not energized is sent to the chamber 16.17 of the hydraulic actuator 18 via the electromagnetic switching valve 47.48, and
is considered to be the neutral position. In addition, the pressure oil in the pressure accumulator 46 flows through the electromagnetic switching valve 49.50 into the chamber 34 of the hydraulic actuator 38.
．． 35, and the hydraulic actuator 38 is set to the neutral position.

When the spool 5 of the select control valve C is moved to the left by the hydraulic actuator 18, the solenoid 47
When a is excited, the chamber 16 is connected to the tank 4 via the electromagnetic switching valve 47.
3, pressure oil is sent from the pressure accumulator 46 to the chamber 17 via the electromagnetic switching valve 48, so that the small diameter piston 7
1 and the spool 5 moves to the left. On the contrary, solenoid 48″tJi[t6.!4:17#llm1#jl
148fur is connected to the i tank 43, and pressure oil is sent from the pressure accumulator 46 to the chamber 16 via the electromagnetic switching valve 47, so the spool 5 moves to the right and the hydraulic actuators 51, 52, and 53 One is selected to be operational.

Similarly, for the hydraulic actuator 38, when the solenoid 49a is energized, the spool 33 moves to the left, and conversely, when the solenoid 50a is energized, the spool 33 moves to the right, thereby determining the operating position of the hydraulic actuator E. .

Therefore, when obtaining a reverse gear shift, the boat 8 and the passage 2 are connected by moving the spool 5 of the select control valve C in the opposite direction. Therefore, when the spool 33 of the shift control valve is moved to the left, the passage 2 is connected to the boat 23 through the annular groove 24, pressure oil is sent to the seedling 63, and the piston 60.59 and shift 1-rod 54 moves upward in the figure, and the reverse gear shift is achieved. At the same time, to 5
7 of oil is returned to tank 43 via boat 22, annular groove 21 and passage 37. Here, in order to obtain the first gear shift, when the spool 33 is moved to the right, pressure oil is sent from the passage 2 through the annular groove 21 and the boat 22 to the chamber 57.
While moving the piston 59, 61 downward, the chamber 6
3 is returned to tank 43 via boat 23, annular groove 24 and passage 37. In this way, the shift rod 54 moves downward, and the first gear shift is achieved.

Next, to obtain the second gear, after returning the shift rod 54 to the neutral position, the spool 5 of the shift control valve C is placed in the illustrated state, that is, the hydraulic actuator 18 is placed in the neutral position, and the boat 12 is moved into the annular position. It is connected to the passage 3 via the groove 10. Therefore, when the spool 33 is moved to the left, the pressure oil in the passage 3 is sent through the annular groove 28 and the boat 27 to the chamber 63 of the hydraulic actuator 52, moving the piston 60.59 and the shift rod 55 upward and , the oil in chamber 57 is returned to tank 43 via boat 26, annular W425 and passage 37. Here, in order to obtain the third gear, move the spool 33 to the right, and the pressure oil in the passage 3 will be transferred to the annular groove 25 and the bows 1 to 2.
6 to the chamber 57 of the hydraulic actuator 52, moving the piston 59.60.61 and the shift rod 55 downward, and the oil in the chamber 63 is returned to the tank 43 via the boat 27, the annular groove 28 and the passage 37. It will be done.

Next, when obtaining the fourth gear shift, the shift rod 55
After returning to the neutral position, when the spool 5 is moved to the right by the hydraulic actuator 18, the boat 14 is connected to the passage 4 via the ring 1!13. Next, when the spool 33 is moved to the left by the hydraulic actuator 38, the pressure oil in the passage 4 is sent to the chamber 63 of the hydraulic actuator 53 through the annular groove 32 and the port 31, and the piston 60
59 and shifter 0 56 move upwards, at the same time oil in chamber 57 is returned to tank 43 via port 301 annular groove 29 and passage 37. Here, in order to obtain the fifth gear, when the spool 33 is moved to the right from the above-mentioned state, the passage 4 passes through the annular groove 29 and the boat 30 to the chamber 57 of the hydraulic actuator 53. , the piston 59 , 61 and the shift rod 56 move downward, and at the same time the oil in the chamber 63 is returned to the tank 43 via the port 31 , the annular groove 32 and the passage 37 . In this way, the fifth gear shift is achieved.

Although the above description has been made for the case of a 5-speed transmission, the present invention is not limited to this. For example, in the case of a 7-speed transmission, one shift rod will naturally be added, and the present invention is not limited to this. Select 11 goben C as per person h4
It can be easily configured by using a four-position output type and a four-manpower three-position type shift control valve.

[Effects of the Invention] As described above, the present invention forms a hydraulic circuit for a hydraulic actuator that sequentially passes through a select control valve and a shift control valve from a hydraulic source to drive each shift rod of a transmission. The select control valve and the shift control valve are actuated by a set of 3-position hydraulic actuators controlled by the valves.Simple configuration, 1 control circuit, 0 reliable operation. Therefore, since the 3rd position electrically operated hydraulic actuator is used as the hydraulic actuator to drive the shift 1-lot, and the restoring force of the spring is not used to operate the control valve and the hydraulic actuator, it is difficult to move the shift rod to neutral. The return is reliable and quick and accurate gear shifting operation can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a hydraulic control device for an automatic transmission according to the present invention. A: Hydraulic unit B2 control circuit C: Select control valve D=Shift-[1 valve E, 18.38.51.52.
53: Hydraulic actuator 5.33° spool 6:
Housing 42: Hydraulic pump 43: Tank 47.4
B, 49.50: Solenoid control valve 54, 55, 56: Shift rod Patent applicant Isuzu Motors Co., Ltd. Patent applicant Kawasaki Heavy Industries Co., Ltd. Agent Patent attorney Toshihiro Yamamoto l m V

Claims (1)

[Claims] In a hydraulic control device for an automatic transmission, in which a control valve is provided between a hydraulic actuator and a hydraulic power source that individually actuate n shift rods, the control valve is inserted on the upstream side.
It consists of a human tJn output n position operation select control valve and an n input 3 position operation shift control valve inserted on the downstream side, and each control valve is connected to at least four hydraulic actuators connected to the end of the control valve. A hydraulic control device for an automatic transmission, characterized in that a spool position is controlled by an electromagnetic switching valve, and the operation of a hydraulic actuator connected to the shift rod is controlled.