JPS62155338A - Automatic initial value setting system for torque capacity of friction engaging device - Google Patents

Abstract

PURPOSE:To enable the quick engagement of a clutch and simplify an adjusting process of piston stroke by holding hydraulic pressure acting on a piston of a friction engaging device at an initial value of the torque capacity of the friction engaging device in advance. CONSTITUTION:An oil flow way 9 is connected with a hydraulic space 8 consisting of a clutch ring 1 and a clutch piston 2. And a hydraulic pressure sensor 10 which is a hydraulic pressure detecting section to detect hydraulic pressure, is provided to the oil flow way 9. And the increment of hydraulic pressure is computed every minute time, and hydraulic pressure in a friction engaging device is made to be an initial value of a friction engaging device when an increasing rate of the increment in hydraulic pressure exceeds a predetermined value. Accordingly, the friction engaging device can be immediately engaged with slight hydraulic pressure applied from that time on.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a friction engagement device used in a clutch for transmitting rotational force or a brake for stopping rotation, and particularly relates to a friction engagement device used in a clutch for transmitting rotational force or a brake for stopping rotation. If it becomes necessary to match the
The present invention relates to a method for automatically setting an initial value of the torque capacity of a friction engagement device for performing a preparatory operation of a piston.

[Conventional technology]

For example, a clutch, which is a friction engagement device for transmitting rotational force used in a transmission or transfer installed in an automobile, has a structure as shown in FIG. 3. That is, a plurality of clutch plates 3 are arranged and fixed inside a ring-shaped clutch cylinder 1 with one end open, and a clutch piston 2 is arranged between the closed end of the clutch cylinder 1 and one end of the clutch plates 3. ing.

Further, a plurality of clutch disks 4 are arranged between the plurality of clutch plates 3, and a clutch cylinder l
A backing plate 5 and a snap ring 6 are arranged at the open end of.

The clutch piston 2 receives a pressing force in the direction of the clutch cylinder 1 by the return spring 7, and in this state, the clutch plate 3 and the clutch disc 4 are released, and the rotation of the clutch cylinder 1 is caused by the rotation of the other rotating members ( However, as oil is supplied to the hydraulic space 8 by hydraulic drive, the clutch piston 2 moves against the pressing force of the return spring 7.
When a pressing force is applied to the clutch plate 3, the clutch plate 3, clutch disc 4, and buffing plate 5
are integrally engaged, and the rotation of the clutch cylinder l is transmitted to other rotating members (not shown) via the backing plate 5.

The above-mentioned clutch adjusts the piston stroke after assembling each member. This method applies a specified air pressure to the oil in the clutch, measures the piston stroke, and adjusts the piston stroke so that the standard value is within a certain error range. If so, the process of disassembling the clutch, replacing the buffing plate 5 with one of a different thickness, reassembling it, and measuring the piston stroke is repeated.

[Problem that the invention seeks to solve]

However, in the above-mentioned process of adjusting the piston stroke, in order to precisely adjust the piston stroke,
There are problems in that several types of banking plates with slightly different thicknesses are required, and that once assembled, they must be reassembled, which increases the number of assembly steps. Moreover, this adjustment process requires a lot of effort as it has to be done for each machine, and there is also a problem in that the banking plate also has variations in plate thickness, resulting in stroke variations even when the piston stroke is adjusted. .

That is, when the clutch is in the released state, it is necessary to keep the clutch disk 4 separated from the clutch plate 3 and backing plate 5 to prevent heat generation and wear, so it is preferable that the piston stroke be large. However, if the piston stroke is large, when the clutch is about to engage, the clutch piston 2 will only move when the hydraulic space 8 in the clutch cylinder 1 is filled with oil. This is the initial value. ), it takes a considerable amount of time to reach the clutch plate 3, causing a problem that engagement of the clutch 7 is delayed.

The present invention solves the above problems, and simplifies the process of adjusting the piston stroke.
The purpose is to automatically set the initial value of the torque capacity of the frictional engagement device when the piston of the frictional engagement device starts to move, so that the frictional engagement device can be engaged in a short time when necessary. It is.

[Means for solving problems]

For this purpose, the method for automatically setting the initial value of the torque capacity of the frictional engagement device of the present invention is such that a piston is disposed inside a cylinder, and oil is supplied from an oil passage to a hydraulic space between the cylinder and the piston. In a friction engagement device that moves the piston and engages the cylinder and a member that is relatively rotatable with the cylinder by the pressing force of the piston,
A hydraulic pressure detection unit is provided in the oil passage, and the increase in the hydraulic pressure acting on the piston is calculated every minute time, and the hydraulic pressure when the increase rate of the increase in the hydraulic pressure exceeds a predetermined value is detected by the friction engagement device. This is characterized in that the initial value of the torque capacity is set as the initial value of the torque capacity.

[Action and effect]

According to the present invention, if the hydraulic pressure acting on the piston of the frictional engagement device is maintained at the initial value of the torque capacity of the frictional engagement device in advance, the frictional engagement device can be put on standby in a state where it does not have a torque capacity but can respond immediately. After that, by applying a small amount of oil pressure, the frictional engagement device can be immediately brought into a locked state. Also, since there is no need to replace the banking plate,
The process of adjusting the viston stroke can be simplified.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of a control system that employs a friction engagement device according to the setting method of the present invention, FIG. 2 is a diagram showing changes over time in the oil pressure acting on the piston of the friction engagement device, 3
The figure is a diagram showing the structure of a frictional engagement device. In the figure, 1 is a clutch cylinder, 2 is a clutch piston, 3 is a clutch plate, 4 is a clutch disc, 5 is a backing plate, 6 is a snap ring, 7 is a return spring,
8 is a hydraulic space, 9 is an oil path, 10 is an oil pressure sensor, 11 is a switching valve device, 20 is an oil pressure detection section, 21 is a low-pass filter, 22 is an A/D conversion section, 23 is a cpu, 24 is an actuator preparation signal, 25 is a RAM, 26 is a ROM, and 27 is an actuator.

In the frictional engagement device shown in FIG. 3, the hydraulic pressure acting on the clutch piston 2 is changed as shown in FIG. While the clutch piston 2 is moving, the oil pressure increases slowly, and when the clutch piston 2 hits the clutch plate 3 and the movement of the clutch piston 2 suddenly decreases,
There is no change in the volume of the hydraulic space 8, and the oil pressure rapidly increases.

The point Po at which this oil pressure suddenly increases is the point where the oil pressure acting on the clutch piston 2 and the force of the return spring 7 are balanced, and thus becomes the initial value of the torque capacity of the clutch. In other words, if the hydraulic pressure acting on the clutch piston 2 is held at Po in advance, it can be kept in a state where it can respond immediately even though it has no torque capacity, and then by applying a small amount of hydraulic pressure, the clutch can be activated. It is possible to immediately put it into a coherence state.

Therefore, an oil pressure sensor 10 is provided in the oil passage 9, and the oil pressure rising gradient is measured to find the point P where the oil pressure suddenly increases. Specifically, every minute time Δ is set to 1. Measure the oil pressure P at 1
．． Increase in oil pressure at time ΔPt! = IPt Pt
, 1 1 and Δpt+. 1/Δpt, > α (α
: A preset value greater than 1. ), the value of P P4+g is set as Po. In this way, by determining the upward slope using three consecutive pieces of data, it is possible to prevent variations in the calculation results.

Next, referring to FIG. 1, an embodiment of a control system employing a friction engagement device in which an initial value of the torque capacity of the friction engagement device according to the present invention is set will be described. Smoothed in the low-pass filter 21, A/
The analog signal is digitized in the D converter 22 and input to the CPU 23 manually. On the other hand, the initial value P of the torque capacity of the clutch is stored in the RAM 25, and when the actuator preparation signal 24 is output to the CPU 23,
The actuator 27 is activated by the output signal from the cpU 23.
operates and the switching valve device 11 (
Open Figure 3). Then, when the oil pressure acting on the clutch piston 2 reaches Po, the CPU 23 compares the signal from the oil pressure detection section 20 and the signal from the RAM 25 and makes a judgment.
A signal for closing the switching valve device 11 is output to the actuator 27.

Additionally, as the number of engagements of the clutch increases, the piston stroke changes due to wear of the clutch disc, etc., so when the number of engagements exceeds a certain number, Po stored in the RAM 25 is rewritten by the ROM 26. , Specifically, the increase in oil pressure per minute time I Pt =
When Pt-+ l/Δt becomes larger than a certain value β, P. = β. In addition to directly measuring the number of engagements of the clutch, Po may be rewritten when the distance traveled by the vehicle exceeds a certain value or when the time exceeds a certain value.

As is clear from the above description, according to the present invention, if the hydraulic pressure acting on the piston of the frictional engagement device is maintained at the initial value of the torque capacity of the frictional engagement device in advance, the torque capacity is not immediately increased. can be kept on standby and ready to respond to
After that, by applying a small amount of oil pressure, the frictional engagement device can be brought into the locked state immediately. Furthermore, since there is no need to replace the backing plate, the process of adjusting the piston stroke can be simplified.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of a control system that employs a friction engagement device according to the setting method of the present invention, FIG. 2 is a diagram showing changes over time in the oil pressure acting on the piston of the friction engagement device, 3
The figure is a diagram showing the structure of a frictional engagement device. 1...
Clutch cylinder, 2...Clutch piston, 3...
・Clutch plate, 4...Clutch disc, 5.
...Banking plate, 6...Snap ring, 7
...Return spring, 8...Hydraulic space, 9...
- Oil passage, 10... Oil pressure sensor, 11... Pa switching valve device, 20... Oil pressure detection section, 21... Low pass filter, 22... A/D conversion section, 23... CPU. 24... Actuator preparation signal, 25... RAM
. 26...ROM, 27...actuator. Patent applicant Aisin Warner Co., Ltd. Agent
Patent Attorney Hiroki Shirai (2 others) Figure 1 Figure 2

Claims (2)

[Claims] (1) A piston is disposed inside the cylinder, and by supplying oil from an oil passage to the hydraulic space between the cylinder and the piston, the piston is moved and the pressing force of the piston is used to connect the cylinder and the piston. In a frictional engagement device that engages a cylinder and a relatively rotatable member, a hydraulic pressure detection section is provided in the oil passage, and the increase in the hydraulic pressure acting on the piston is calculated every minute time, and the increase in the hydraulic pressure is calculated at every minute time. 1. An automatic initial value setting method for a torque capacity of a friction engagement device, characterized in that the hydraulic pressure at which the increase rate of the friction engagement device exceeds a predetermined value is set as the initial value of the torque capacity of the friction engagement device. (2) When the number of times the frictional engagement device is interrupted exceeds a predetermined number, the initial value of the torque capacity of the frictional engagement device is recalculated and rewritten. Automatic initial value setting method for torque capacity of a frictional engagement device as described in .