JPS6346755Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE PRESENT DISCLOSURE The present invention relates to a release device for a vehicle hydraulic unit which serves as a hydraulic source for an actuator such as an automatic clutch mechanism or a transmission.

2. Description of the Related Art Conventionally, a control unit comprising a hydraulic actuator has been proposed in which the speed change operation of a transmission or the disconnection/connection operation of a clutch is operated by a control unit comprising a hydraulic actuator. The hydraulic unit that supplies hydraulic pressure to the control unit is configured such that oil from an oil tank is filled into a pressure accumulator via a check valve by a hydraulic pump, and there is a normally closed connection between the pressure accumulator and the control unit. A type solenoid on-off valve is installed.

In the hydraulic unit configured in this way,
When inspecting or servicing the transmission or clutch mechanism, it is necessary to release the hydraulic pressure in the pressure accumulator for safety reasons, but a check valve is installed between the pressure accumulator and the hydraulic pump. Furthermore, since a normally closed electromagnetic on-off valve is disposed between the pressure accumulator and the control unit, the hydraulic pressure of the pressure accumulator cannot be released unless the normally closed electromagnetic on-off valve is energized. Furthermore, when supplying oil to the hydraulic unit on an assembly line, etc., the normally closed electromagnetic on-off valve is closed, so the air inside the hydraulic unit cannot escape, so the oil in the oil tank can reach the hydraulic pump. The problem is that it doesn't get sucked in.

In order to eliminate such problems, it is possible to connect a bypass pipe that bypasses the normally closed electromagnetic on-off valve to the piping that connects the hydraulic unit and the control unit, and to provide a manual on-off valve in the bypass pipe. This is conceivable, but this not only increases the number of parts and increases cost, but also requires measures to prevent oil leakage from these connections.

The purpose of this invention is to solve these problems by making it possible to manually open a normally closed electromagnetic on-off valve from the outside while the hydraulic unit and control unit are connected to release the hydraulic pressure in the pressure accumulator. An object of the present invention is to provide an opening device for a hydraulic unit for a vehicle, which allows air inside a circuit to be vented to the outside simply by driving a hydraulic pump.

For this reason, the configuration of the present invention includes a hydraulic unit in which oil from an oil tank is filled by a hydraulic pump into a pressure accumulator via a check valve, and a control unit having an actuator controlled by a normally open electromagnetic on-off valve. In the vehicle-mounted hydraulic operating system in which a normally closed electromagnetic on-off valve is inserted and connected between the hydraulic unit and the control unit, a push rod for actuating a movable valve body is disposed in the normally closed electromagnetic on-off valve. ,
The normally closed electromagnetic on-off valve can be opened manually.

The present invention will be explained based on examples. As shown in Fig. 1, the automatic transmission starts with the clutch mechanism 2.
, a clutch actuator 5 that connects and disconnects the clutch actuator 5, a gear transmission 21, a transmission actuator 7 that selects the shift position, and an electronic control device 10 that controls each actuator 5, 7. .

The clutch mechanism 2 uses a known pressure plate 2a to press a friction plate supported by an input shaft 22 of a gear transmission 21 against a flywheel 1a fixed to a crankshaft 1 of the engine by the force of a spring. This pressing force is released by pulling the release lever 3 to the right using the clutch actuator 5.

As shown in FIG. 2, the clutch actuator 5 has a piston 38 fitted into a cylinder 42 to define an oil chamber 40 and an atmospheric chamber 41, and a rod 4 connected to the piston 38 which is connected to the release lever 3 (see FIG. 1). ) and is equipped with a stroke sensor (Fig. 1) that detects the displacement of the piston 38. The oil chamber 40 is connected to a hydraulic unit via a normally open electromagnetic on-off valve 33 and a normally closed electromagnetic on-off valve 32. The oil chamber 40 is also connected to the oil tank 39 via a normally closed electromagnetic on-off valve 34 and a normally open electromagnetic on-off valve 35, respectively.

The normally-closed electromagnetic on-off valve 32 is opened only during gear shifting, and when the normally-open electromagnetic on-off valve 35 is closed, pressure oil is supplied from the hydraulic pump 31 to the oil chamber 40, the piston 38 moves to the right, and the clutch is closed. cut off. On the other hand, when the normally open electromagnetic on-off valve 33 is closed and the electromagnetic on-off valves 34 and 35 are opened and closed intermittently, the oil pressure in the oil chamber 40 is gradually released, the piston 38 moves to the left, and the clutch is connected. The operating speed of the clutch actuator 5 is controlled by the duty ratio of the pulses applied to the electromagnetic on-off valves 34, 35.

The transmission actuator 7 is actually composed of a select actuator 7a that performs a select operation in a normal manual transmission, and a shift actuator 7b that performs a shift operation, and its gear position (gear stage) is determined by the gear position. It is designed to be detected by a sensor 8 (FIG. 1).

The select actuator 7a has a large-diameter piston 59 and a stepped piston 60 fitted into a large-diameter cylinder 58 and a small-diameter cylinder 61, which are connected to each other, respectively, and a small-diameter portion of the stepped piston 60 is fitted into the large-diameter piston 59. At the same time, the stepped piston 6
A rod 62 connected to a small diameter cylinder 61 is protruded from the small diameter cylinder 61 to the outside. The end chamber of the large diameter cylinder 58 is switchably connected to the hydraulic pump 31 or the oil tank 39 via the electromagnetic switching valve 57, and similarly, the end chamber of the small diameter cylinder 61 is connected via the electromagnetic switching valve 56. It is adapted to be switchably connected to a hydraulic pump 31 or an oil tank 39.

In order to operate the transmission to a predetermined gear, when the electromagnetic switching valve 57 is switched and pressure oil is supplied to the large diameter cylinder 58, the stepped piston 60 moves to the right in the figure, and the rod 62 moves the piston to a predetermined gear. Selected to shift position. Conversely, when the electromagnetic switching valve 57 is returned and the electromagnetic switching valve 56 is switched to supply pressure oil to the small-diameter cylinder 61, the stepped piston 60 moves to the left in the figure along with the large-diameter piston 59, and reaches a predetermined shift position. Selected to. When returning the select actuator 7a to the neutral position, by energizing both electromagnetic switching valves 56 and 57 and applying hydraulic pressure to the large diameter cylinder 58 and the small diameter cylinder 61, the difference in the pressure receiving areas of the pistons 59 and 60 can be compensated for. Therefore, the large-diameter piston 59 is returned to the neutral position where it abuts against the step between the large-diameter cylinder 58 and the small-diameter cylinder 61, and is maintained at that position even if the electromagnetic switching valves 56 and 57 are demagnetized.

The shift actuator 7b has exactly the same configuration, and the operating direction of the rod 62 of the stepped piston 60 is the same as that of the select actuator 7a.
It differs from that in that it is arranged at right angles. Therefore, the large diameter cylinder 58 or the small diameter cylinder 6
1 can be operated to a predetermined shift position, and by supplying hydraulic pressure to the large diameter cylinder 58 and the small diameter cylinder 61, it can be operated to a neutral position.

When driving on a normal flat road, the gears are automatically shifted from the start to a high speed, and the selector lever 1
depending on N (neutral position), D (all automatic gear shifting),
The driving mode can be switched to the following ranges: (1st speed), (2nd speed), (automatic shifting of 1st, 2nd, and 3rd speeds), and R (reverse), and the switching position of this range is determined by the driving mode sensor. 14 (FIG. 1). Since such a configuration is not directly related to the gist of the present invention, a description thereof will be omitted.

As shown in FIG. 1, the electronic control device 10 is composed of a microprocessor 12, a memory 11, and an interface 9. Changes in the status of each operating part, which will be described later, are input to the interface 9 as digital signals. Based on these input signals and the control values stored in the memory 11, the solenoid valve of the control unit 63 is driven by a signal calculated by the microprocessor 12, and the clutch actuator 5 and the transmission actuator 7 are controlled. It is becoming more and more like this.

In order to detect the engine speed, an electromagnetic pickup type rotation sensor 24 is arranged on the outer circumferential side of the flywheel 1a, and this digital signal is input to the interface 9. Similarly, a rotation sensor 23 is attached to the input shaft 22 of the synchronous mesh transmission 21, and the rotation sensor 23 is attached to the output shaft 22 of the synchronous mesh transmission 21.
0 are each equipped with a vehicle speed sensor 19, and these digital signals are input to the interface 9. Further, an accelerator sensor 15 is disposed to detect the operation amount of the accelerator pedal 16, a brake sensor 17 is disposed on the brake pedal 18, and a driving mode sensor 14 is disposed adjacent to the selector lever 13, and these signals are transmitted to the interface 9. is input to.

The hydraulic unit 6 is constructed as shown in FIG. Oil in the oil tank 39 is supplied by the oil pump 31 to the pressure accumulator 55 via the check valve 53, and is maintained at a pressure at which the pressure switch 54 is opened. When the pressure in the pressure accumulator 55 decreases, the pressure switch 54 closes and the electric motor 51 connected to the oil pump 31 is driven. A relief valve 52 is connected between the discharge port of the hydraulic pump 31 and the oil tank 39 in case the electric motor 51 is not stopped due to a failure of the pressure switch 54 or the like.

The hydraulic pump 31 through the pressure accumulator 55 are connected to a control unit 63 via a normally closed electromagnetic on-off valve 32. Actually, as shown in Fig. 3, the oil tank 39
A conduit 71 from the oil pump 31 has a fitting 72.
while the piping from the pressure accumulator 55 is connected to the control unit 63 through joints 73, 74 and a conduit 77. Then, the control unit 63 connects the conduit 7 of the oil tank 39 with the joint 75.
Connected to 6.

When assembled to a car, the oil tank 39
Because the head difference between the oil tank 39 and the oil pump 31 is small, and because the normally closed electromagnetic on-off valve 32 of the control unit 63 is closed, the internal air cannot escape and the oil in the oil tank 39 flows into the oil pump 31. The oil may not be guided to the suction port, and even if the oil pump 31 is driven, it may not be possible to force-feed the oil to the pressure accumulator 55.

In the present invention, the normally closed electromagnetic on-off valve 32, which normally maintains the pressure in the pressure accumulator 55, can be opened manually in order to remove air from inside the piping of the hydraulic unit 6. Therefore, as shown in FIG. 4, in the normally closed electromagnetic on-off valve 32, a hollow core 85 having an electromagnetic coil 84 is screwed and supported on one end side of a cup-shaped housing 83. A plunger 88 made of a magnetic material that is biased leftward by excitation is fitted. A rod 89 that abuts against the plunger 88 is slidably supported by a guide 97 fitted into the housing 83, and biased against a poppet valve 90, which is a movable valve body fitted into a valve box 98. It's getting old.

The valve body 98 is provided with a radial passage 95 in its center, which communicates with the inlet passage 82 via a chamber 96 . Also,
A chamber 94 communicating with the outlet passage 81 is provided at the end of the valve box 98, and a spring 93 supported by a guide 92 of this chamber 94 allows the poppet valve 90 to be connected to the chamber 94 and the passage 9.
It closes the gap between 5 and 5. In order to operate the plunger 88 from the outside, a push rod 8 is attached to the core 85.
6 is supported by a plunger 88 via a spring 87 so as to abut against it.

In the present invention, by configuring the normally closed electromagnetic on-off valve 32 as described above, when the push rod 86 is pushed to the left against the spring 87, the push rod 8
6 hits the plunger 88, and the poppet valve 90 is pushed to the left against the spring 93 through the rod 89, so that the chamber 94 and the passage 95 communicate with each other. Therefore, when the inlet passage 82 and the outlet passage 81 are communicated with each other and the oil pump 31 is driven, the air inside the hydraulic unit 6 is transferred to the normally closed electromagnetic on-off valve 32, which is normally open, as shown in FIG. Type electromagnetic on-off valve 33, 35
and is expelled to the oil tank 39 via the conduit 76,
From here, the oil is discharged to the outside, and while the oil in the oil tank 39 is circulated to the oil tank 39 via the above-mentioned hydraulic unit 6 and control unit 63, the air inside can be completely removed.

Therefore, if the push rod 86 is released and the normally closed electromagnetic on-off valve 32 is closed, the oil pump 31 is driven to forcefully send oil to the pressure accumulator 55.
It is possible to perform the function as

Since the present invention is constructed as described above, the air inside the hydraulic unit and the control unit can be easily vented to the outside. Further, since there is no need to provide a special bypass pipe for air venting, it is not only possible to reduce costs, but also to improve reliability against oil leakage.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of an automatic transmission, Figure 2 is a hydraulic circuit diagram of the device, Figure 3 is a configuration diagram of a vehicle hydraulic unit opening device according to the present invention, and Figure 4 is a regular diagram of the device. FIG. 3 is a side sectional view of a closed electromagnetic on-off valve. 2... Clutch mechanism, 5... Clutch actuator, 6... Hydraulic unit, 7... Transmission actuator, 10... Electronic control device, 13... Selector lever, 15... Accelerator sensor, 16...
...Accelerator pedal, 21...Synchronous mesh transmission,
31... Hydraulic pump, 32... Normally closed electromagnetic on-off valve, 39... Oil tank, 55... Pressure accumulator, 63...
...control unit, 84...electromagnetic coil, 86...
Pushyurotsudo, 88... Plungiya, 90...
Poppet valve, 98...valve box.

Claims (1)

[Scope of utility model registration request] It is equipped with a hydraulic unit in which oil from an oil tank is filled by a hydraulic pump into a pressure accumulator via a check valve, and a control unit having an actuator controlled by a normally open electromagnetic on-off valve. In an on-vehicle hydraulic actuator in which a normally closed electromagnetic on-off valve is inserted and connected between the unit and the
An opening device for a hydraulic unit for a vehicle, characterized in that the normally-closed electromagnetic on-off valve is provided with a push rod that operates a movable valve body, so that the normally-closed electromagnetic on-off valve can be opened manually.