JPH10339688A - Valve body inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly inspect timing where a friction engagement device that is engaged and operated by the actuation of a valve body engages by inspecting the valve body single substance. SOLUTION: A valve body inspecting device has a dummy hydraulic servo 4 corresponding to the hydraulic servo of a friction engagement device being actuated by hydraulic output from a valve body V/B, and a means 5 for detecting a piston stroke that can actually measure the stroke of a piston 41. Oil pressure is supplied, the dummy hydraulic servo 4 is actuated, and the stroke of the piston 41 is actually measured, thus inspecting the actuation of the valve body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a valve body of an automatic transmission, and more particularly to an apparatus for inspecting an output for operating a friction engagement device of a valve body.

[0002]

2. Description of the Related Art An automatic transmission is provided with a plurality of friction engagement devices for changing a power transmission flow of a gear train to obtain a plurality of shift speeds. As a hydraulic control device that controls engagement and disengagement of a friction engagement device by supplying and discharging operating hydraulic pressure, a valve body having a built-in hydraulic circuit including various valves is incorporated. The manufacturing process of the valve body includes an inspection process for independently inspecting whether or not the assembled valve body can be normally operated by supplying the operating oil pressure.

Conventionally, in this valve body inspection process,
Actually supplies the oil pressure to check whether the oil pressure output from the oil passage opening that will be connected to the hydraulic servo of the friction engagement device when incorporated in the automatic transmission satisfies the desired pressure characteristics. Inspection is performed by measuring the output oil pressure with a pressure sensor.

[0004]

By the way, in the case of an automatic transmission in which the friction engagement device is gripped at the time of gear shifting, the timing of gripping is important with respect to gear shift shock. Output hydraulic pressure inspection
Although the hydraulic characteristics can be confirmed, there is no guarantee that the intended engagement timing of the friction engagement device can be obtained by the hydraulic characteristics when actually incorporated in the automatic transmission.

Accordingly, it is a first object of the present invention to provide a valve body inspection apparatus which can directly inspect the engagement timing of a friction engagement device.

In an automatic transmission, a hydraulic pressure supplied to a hydraulic servo of a friction engagement device for shifting is determined by a current value applied to a linear solenoid disposed on a valve body side without using an accumulator. There is a type of direct control, and in such a valve body for an automatic transmission, it is necessary to inspect the timing of engagement with the applied current value of the linear solenoid with high accuracy, but it is actually incorporated in the automatic transmission. If the measurement is performed under a condition different from the capacity of the oil passage from the valve body to the cylinder of the hydraulic servo in this case, a deviation occurs between the inspection result and the mounting state, and the engagement timing cannot be accurately inspected.

Accordingly, a second object of the present invention is to enable a valve body inspection apparatus to perform an inspection in a state similar to that actually installed in an automatic transmission.

Incidentally, the operating hydraulic pressure of the hydraulic servo and the piston stroke do not always correspond one-to-one. For example, there is a case where the piston is stroked by a predetermined amount, the hydraulic pressure is low, or the piston is at a hydraulic pressure to be stroked by a predetermined amount, but the stroke is not actually performed.

Therefore, a third object of the present invention is to improve the inspection accuracy of an inspection device for a valve body by inspecting both the hydraulic characteristics and the piston stroke.

[0010]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention relates to a valve body for inspecting the operation of a valve body incorporated in an automatic transmission by supplying hydraulic pressure to the valve body alone. In the inspection device, a dummy hydraulic servo corresponding to a hydraulic servo of a friction engagement device operated by a hydraulic output from the valve body is provided, and a piston stroke detecting means capable of actually measuring a stroke of a piston of the dummy hydraulic servo. The operation of the valve body is inspected by actuating a dummy hydraulic servo by supplying hydraulic pressure and actually measuring the stroke of the piston.

Next, in order to achieve the second object, the dummy hydraulic servo is provided on a jig block provided with an oil passage corresponding to an oil passage of a transmission case in which a valve body is incorporated. You.

Further, in order to achieve the third object, the inspection device is provided with a pressure sensor for inspecting the operation oil pressure of the dummy hydraulic servo, and the operation of the valve body is determined by the actually measured piston stroke and the operation oil pressure. It is configured to be inspected.

[0013]

According to the first aspect of the present invention, the piston stroke of the dummy hydraulic servo actually operated by the operating oil pressure output from the valve body can be measured. So
The timing of direct engagement can be checked.

According to the second aspect of the present invention, the oil passage from the valve body to the cylinder of the hydraulic servo at the time of inspection is set to have substantially the same capacity as that in the state actually installed in the automatic transmission. Therefore, even when the valve body alone is inspected, the engagement timing of the friction engagement device can be accurately inspected.

Further, according to the third aspect of the present invention, since the piston stroke of the hydraulic servo of the friction engagement device can be measured and the operating oil pressure at that time can be inspected, the valve body can be inspected with higher accuracy. can do.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a valve body inspection apparatus according to an embodiment in a hydraulic circuit.
It is a device that checks the operation of a valve body (V / B) incorporated in an automatic transmission by supplying hydraulic pressure to the valve body alone. A jig block 2 for mounting a valve body alone for inspection is fixed to a top plate 1 of the apparatus, and the valve body (V /
A hydraulic unit 9 mainly composed of a gear pump (not shown) is provided as a pressure source for supplying hydraulic pressure to B), and an oil passage A from the hydraulic unit 9 passes through the flow meter 3 and is supplied to the supply side oil passage in the jig block 2. B.

According to the present invention, a jig block 2 has a dummy hydraulic pressure corresponding to a hydraulic servo of a friction engagement device which is operated by a hydraulic output from a valve body (V / B) when incorporated in an automatic transmission. A servo 4 and a piston stroke detecting means 5 capable of measuring the stroke of the piston 41 of the hydraulic servo 4 are provided. The dummy hydraulic servo 4 is provided in a jig block 2 having an oil passage C corresponding to an oil passage of a transmission case in which a valve body (V / B) is incorporated, specifically, a stroke detection jig 2A attached thereto. It has been incorporated. Further, the apparatus is provided with a pressure sensor 6 for checking the operating oil pressure of the hydraulic servo 4.

Hereinafter, these components will be described in detail. First, as shown in FIG. 1, when the jig block 2 is mounted with the valve body (V / B), in addition to the supply-side oil passage B that matches the hydraulic supply opening S of the hydraulic circuit, An output-side oil passage C is formed to match an output opening U for outputting an engagement pressure to a hydraulic servo of a friction engagement device of a transmission. The output side oil passage C is formed by an oil passage from an output opening U of the valve body (V / B) shown in detail in FIG. 2 to an opening of the cylinder 42 of the hydraulic servo 4 shown in detail in FIG. The length is set to be approximately the same as the oil passage of the machine case so as to have a capacity substantially equal to the length and the inner diameter cross section.

As shown in detail in FIG. 3, a dummy hydraulic servo 4 is built in a piston stroke detecting jig 2A separate from the jig block 2 to approximate the capacity of the oil passage. Therefore, they are arranged in a form embedded in the jig block 2. In this embodiment, the dummy hydraulic servo 4 is a combination of two hydraulic servos that partially share the cylinder 42 back to back, and is slidably fitted to the drum-shaped cylinder 42 and the inner diameter side thereof. The piston 41 having the same shape and the outer diameter side of the cylinder 42 are slidably fitted on the outer diameter side of the cylinder 42, and the outer diameter side is slidably fitted on the cylinder 43 integrated with the cylinder 42 by welding or the like by a separate member. A normal ring-shaped piston 44 inserted and a return spring mechanism 45 shared by both pistons 41, 44 are provided. In this case, the other hydraulic servo having the ring-shaped piston 44 is not provided for measurement, but is provided as it is in order to bring the state at the time of measurement as close as possible to the actual operation state.

Further, the piston stroke detecting jig 2A is provided with a stroke detecting means 5 composed of a contact type position sensor in which a detecting portion is brought into contact with the piston 41. The stroke detecting means 5 is attached and fixed to a jig cover 2B which covers the opening after the hydraulic servo 4 is assembled in the main body of the piston stroke detecting jig 2A.

Returning to FIG. 1, the pressure sensor 6 is constituted by a pressure transducer for converting the pressure in the oil passage into an electric signal. The drain oil passage D is provided with an electromagnetic on-off valve 7 for bleeding air downstream of the position where the pressure sensor 6 is provided. Further, a check valve 8 is provided on the discharge side of the drain oil passage D in order to prevent an error in the inspection value due to air suction from the drain oil passage D into the hydraulic servo 4.

Next, a description will be given of an inspection process using the apparatus configured as described above, mainly with reference to FIG. First, the sequencer is operated by an electronic control unit (not shown), and the valve body (V / B) is fixed to the jig block 2 by an appropriate clamp. Next, the valve body (V / B) is mechanically operated (specifically, the range position of the manual valve in the valve body is switched by a command from the electronic control unit) and the manual shift switching mechanism is electromagnetically operated. (Specifically, an on / off signal and a duty ratio signal of a control current are output to each of the on / off solenoid valves and the linear solenoid valves in the valve body in accordance with a command from the electronic control unit.)

In this state, the supply of the hydraulic pressure from the hydraulic unit 9 is started, the manual shift switching mechanism and the energizing unit are operated, and the operating hydraulic pressure is output from the output opening U of the valve body (V / B). The circuit state is established, and the electromagnetic on-off valve 7 is first opened to bleed air from the hydraulic servo 4.
For this purpose, the drain oil passage D is connected to the top of the jig 2A. When the air bleeding by the oil drain from the drain oil passage D is completed, the electromagnetic on-off valve 7 is closed, and in this state, the inspection preparation of the valve body (V / B) is completed.

Next, the energizing unit is operated to set the circuit state of the valve body (V / B) to the state of the gear before the gear to be engaged with the frictional engagement device corresponding to the hydraulic servo 4, Enter measurement. Then, a signal similar to the actual shift signal output is output to the energizing unit, and the valve body (V
The hydraulic circuit in / B) is switched from the state before the initial shift to the shift state. By this operation, specifically, each on / off solenoid valve, shift valve, relay valve, etc. is switched to a predetermined range position of the manual valve in the valve body (V / B), and the output of the linear solenoid valve is performed. By adjusting the pressure of the control valve for controlling the servo pressure according to the solenoid pressure, the operating oil pressure is output to the output side opening U connected to the hydraulic servo to be engaged for achieving the gear position. Become. This operating oil pressure is usually a pressure adjustment operation of a control valve for servo pressure control by applying a solenoid pressure output from a linear solenoid valve in response to a duty ratio signal of a control current. The oil pressure is immediately returned to a low oil pressure, and then is raised to a line pressure through a rising process according to predetermined characteristics. Due to the initial first fill, the piston 41 rapidly strokes by an idle stroke irrelevant to engagement, and shifts to a slow stroke from there to engagement. Therefore, while the piston stroke is measured by the stroke detecting means 5, the operating oil pressure is also measured by the pressure sensor 6.

The method of evaluating the test results thus obtained is as follows.
Although it is outside the scope of the present invention, since the piston stroke can be measured as described above, for example, the engagement start position when the initial play stroke is eliminated, the position when the final engagement is completed, the intermediate engagement between them It is a method of inspecting whether the three points at the position in progress satisfies the expected stroke amount, and evaluating the working hydraulic pressure at those three points against whether or not the expected hydraulic pressure value is obtained. The characteristics of the output hydraulic pressure for operating the friction engagement device of the valve body (V / B) and the operating characteristics of the servo piston by the output hydraulic pressure can be inspected and evaluated together.

As described in detail above, according to this valve body inspection apparatus, it is possible to actually measure the piston stroke of the dummy hydraulic servo 4 actually operated by the operating oil pressure output from the valve body (V / B). So you can
The timing of direct engagement can be checked. Since the oil passage C from the valve body (V / B) to the cylinder 42 of the hydraulic servo 4 at the time of the inspection has substantially the same capacity as that actually installed in the automatic transmission, the valve body alone is Even if it is an inspection, it is possible to accurately inspect the timing of engagement of the friction engagement device. Furthermore,
Since the piston stroke of the hydraulic servo 4 of the friction engagement device can be measured and the operating oil pressure at that time can be inspected, the valve body (V / B) can be inspected with higher accuracy.

As described above, the present invention has been described in detail based on one embodiment. However, the present invention is not limited to the disclosed contents of the above embodiment, and various details may be included within the scope of the claims. Needless to say, the present invention can be implemented by changing the specific configuration.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of a valve body inspection device according to an embodiment of the present invention.

FIG. 2 is a side view of a jig block of the device.

FIG. 3 is a side sectional view of a piston stroke detection jig of the device.

[Explanation of symbols]

V / B Valve body C Output side oil passage (oil passage) 2 Jig block 2A, 2B Piston stroke detection jig (Jig block) 4 Dummy hydraulic servo 5 Piston stroke detection means 6 Pressure sensor 41 Piston

Claims (3)

[Claims] 1. A valve body inspection apparatus for inspecting the operation of a valve body incorporated in an automatic transmission by supplying hydraulic pressure to the valve body alone, wherein the friction engagement device is operated by hydraulic pressure output from the valve body. And a piston stroke detecting means capable of measuring the piston stroke of the dummy hydraulic servo. The dummy hydraulic servo is actuated by supplying hydraulic pressure to actually measure the piston stroke. An inspection apparatus for a valve body, wherein the operation of the valve body is inspected by performing the following. 2. The valve body inspection apparatus according to claim 1, wherein the dummy hydraulic servo is provided on a jig block provided with an oil passage corresponding to an oil passage of a transmission case into which the valve body is incorporated. 3. The valve body according to claim 1, further comprising a pressure sensor for inspecting an operation oil pressure of the dummy hydraulic servo, wherein an operation of the valve body is inspected by an actually measured piston stroke and an operation oil pressure. Inspection equipment.