JPH0442566Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic pressure supply device for driving an actuator of an automatic gear transmission for a vehicle.

[Prior Art] There is already an automatic gear transmission in which the hydraulic circuit of the actuator that drives the clutch mechanism and the gear transmission is controlled by output signals from a microcomputer that receives signals corresponding to vehicle speed, engine speed, engine load, etc. It has been put into practical use. The present applicant has already developed a hydraulic power supply system for operating the actuator of the above-mentioned automatic gear transmission, which is equipped with a hydraulic pump driven by the vehicle's engine and a hydraulic pump driven by the vehicle's onboard power battery in case of an emergency. Jitsugan Showa 59
-It has been filed under No. 116683.

By the way, when driving an actuator using lubricating oil that lubricates a gear transmission as a hydraulic fluid for pressure transmission, it is necessary to install an oil filter in the middle of the high-pressure circuit, and the oil filter must be replaced (generally, only the element is replaced). ), if
Attempting to directly remove high-voltage circuit components is extremely dangerous, as oil from the high-voltage circuit will scatter and come into contact with the operator's eyes. Additionally, there is a danger that the high-voltage circuit will scatter oil in the form of a mist, which can easily catch fire.

[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to safely return the pressure oil in the high-pressure circuit to the oil tank when repairing or inspecting the high-pressure circuit, such as replacing the oil filter. The purpose of the present invention is to provide a hydraulic supply device that can perform the following tasks.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is such that an oil filter is disposed in the middle of the piping connecting the pressure accumulator connected to the discharge port side of the hydraulic pump and the actuator. A manual pressure relief valve is provided in the middle of the piping that communicates the chamber housing the filter with the oil tank to release the hydraulic pressure from the pressure accumulator to the oil tank.

[Function] The oil filter chamber located in the middle of the high pressure circuit connecting the pressure accumulator and actuator is connected to the oil tank via a manual pressure relief valve, so when replacing the oil filter, etc. When opened, the hydraulic pressure in the pressure accumulator is released to the oil tank via the pressure relief valve. Therefore, the oil filter can be replaced safely.

[Embodiment of the invention] As shown in FIG. 1, the oil tank 29 is connected through a pipe 30 to the suction port of a main hydraulic pump 32 driven by the engine, and the discharge port of the main hydraulic pump 32 is connected through a pipe 31. It is connected to the unload valve 15. The unloading valve 15 is connected to the pressure accumulator 2 via a pipe 17. The pressure accumulator 2 is connected to the pressure accumulator 2a via a check valve 26, a pipe 18, a joint 4, and a pipe 3.

The pressure oil in the pressure accumulators 2 and 2a is supplied to one end chamber of the actuator via the joint 4, the pipe 5, the oil filter 13, the terminal 8 of the pipe 12, and a directional control valve (not shown), and then to the other end of the actuator. The oil in the room is
A pipe 28 with an end 9 returns to the oil tank 29 .
When the oil pressure in the pressure accumulator 2 becomes excessive, the unload valve 15 returns pressure oil from the pipe 31 to the oil tank 29 via the pipe 10 and the pipe 28.

The emergency sub-pump unit 19 is powered by an electric motor 23
The sub-hydraulic pump 24 is driven by a sub-hydraulic pump 24 whose suction port is connected to the pipe 27 and the pipe 30.
The outlet of the auxiliary hydraulic pump 24 is connected to the oil tank 29 via the pipe 16 and the check valve 22 to the joint 4.
connected to. A safety valve 25 is connected between the pipe 16 and the pipe 27 to release hydraulic pressure when the discharge pressure of the auxiliary hydraulic pump 24 becomes excessive.

A pressure switch 20 is connected to the downstream side of the check valve 22 of the pipe 16, and is configured to drive and stop the electric motor 23 via a relay 21. For this purpose, four terminal conductive wires are drawn out from the sub-pump unit 19 and connected to an electronic control device driven by a power battery (not shown).

According to the present invention, one end of the pipe 7 is connected in the middle of the pipe 10, and the other end of the pipe 7 is connected to the oil filter 13 via the manual pressure relief valve 6. The pressure relief valve 6 is normally closed.

In the case of a hydraulic pressure supply system for an automatic gear transmission, the terminals 8 and 9 have an actuator for clutch operation, an actuator for select operation of the gear transmission, and an actuator for shift operation of the gear transmission, each of which has separate direction switching. Connected via a valve.

Next, the operation of the hydraulic pressure supply device according to the present invention will be explained. Normally, the main hydraulic pump 32 is driven by the engine of the vehicle, and the electric motor 23 that drives the auxiliary hydraulic pump 24 is stopped. Therefore, oil tank 2
The oil sucked into the main hydraulic pump 32 from the pipe 30 through the pipe 31 is transferred to the unload valve 15 and the pipe 17.
is supplied to the pressure accumulator 2 via the check valve 26,
It is supplied to the pressure accumulator 2a via the pipe 18, the joint 4, and the pipe 3. When a directional control valve (not shown) is activated,
The pressure oil of the pressure accumulators 2, 2a is transferred from the pipes 18, 3 to the joint 4,
Terminal 8 via pipe 5, oil filter 13, and pipe 12
The oil in the other end chamber of the actuator is returned to the oil tank 29 from the terminal 9 through the pipe 28.

In an emergency, for example, if the main hydraulic pump 32 fails, the electric motor 23 is driven by an on-vehicle power battery. Therefore, the oil in the oil tank 29 flows into the pipe 30,
27 to the auxiliary hydraulic pump 24, and the pipe 1
6, pressure accumulator 2a via check valve 22, joint 4, pipe 3
is filled quickly. When the oil pressure in the pressure accumulator 2a reaches a predetermined value, the pressure oil in the pressure accumulator 2a passes through the joint 4, the pipe 5, the oil filter 13, and the pipe 12, and then flows from the terminal 8 of the pipe 12 to one end of the actuator as described above. The oil in the other end chamber of the actuator is returned from the terminal 9 via the pipe 28 to the oil reservoir 29.

Since a check valve 26 is built in at the outlet of the pressure accumulator 2, the pressure oil from the auxiliary hydraulic pump 24 is transferred to the pressure accumulator 2a.
The oil pressure of the pressure accumulator 2a is quickly increased to a predetermined value.

When the pressure relief valve 6 is opened when repairing or inspecting the high pressure circuit such as replacing the oil filter 13, the pressure accumulator 2
The hydraulic pressure of the accumulator 2a enters the joint 4 via the check valve 26 and the pipe 18, and the hydraulic pressure of the accumulator 2a enters the joint 4 via the pipe 3. Both enter the inside of the oil filter 13 via the pipe 5, and then the pressure is released. Valve 6, pipes 7, 10, 28
The oil is then released to the oil tank 29. Therefore, the conventional problem of pressurized oil being scattered to the outside when the high-pressure circuit is opened, such as when replacing the oil filter 13, is eliminated, and repair and inspection work can be performed safely.

In addition, the pressure accumulator 2a is similar to the pressure accumulator 2,
They may also be connected in series as shown in FIG.

[Effects of the invention] As described above, the present invention disposes an oil filter in the middle of the piping connecting the pressure accumulator connected to the discharge port side of the hydraulic pump and the actuator, and connects the chamber housing the oil filter and the oil tank. There is a manual pressure relief valve in the middle of the connecting piping that releases the hydraulic pressure from the pressure accumulator to the oil tank, so when the high pressure circuit is opened for repair or inspection of the high pressure circuit such as replacing the oil filter. When the pressure relief valve is opened, the hydraulic pressure in the high-pressure circuit is released to the oil tank, so the pressure oil in the high-pressure circuit, including the pressure accumulator, can be scattered outside, spraying the worker's face or igniting nearby flames. You can prevent dangers such as

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram of a hydraulic pressure supply device according to the present invention, and FIG. 2 is a hydraulic circuit diagram showing main parts of a hydraulic pressure supply device according to a partially modified embodiment of the present invention. 2, 2a... Pressure accumulator, 4... Joint, 6... Pressure release valve, 8, 9... Terminal, 13... Oil filter, 15... Unload valve, 23... Electric motor, 2
4... Sub-hydraulic pump, 29... Oil tank, 32... Main hydraulic pump.

Claims (1)

[Scope of utility model registration request] An oil filter is installed in the middle of the piping that connects the pressure accumulator connected to the discharge port side of the hydraulic pump and the actuator, and the oil pressure of the pressure accumulator is connected to the oil tank in the middle of the piping that communicates the chamber that accommodates the oil filter with the oil tank. A hydraulic supply device characterized by being equipped with a manual pressure relief valve.