JPS6013723Y2 - Oil tank of vehicle speed responsive power steering device - Google Patents

Description

[Detailed description of the invention] The present invention provides a vehicle speed responsive power steering system having a steering control device consisting of a power auxiliary device and a vehicle speed response device. This invention relates to an improvement in an oil tank that secures the amount of oil necessary for each sub-pump that supplies oil to operate.

In recent years, various so-called vehicle speed responsive power steering devices, in which steering characteristics change in response to vehicle speed, have been devised and put into practical use.

The vehicle speed response device drives a sub-pump by, for example, the output shaft of a transmission, and changes the discharge flow rate of the sub-pump in response to the vehicle speed, thereby controlling the amount of oil supplied to the power auxiliary device of the power steering device and the effect on the reaction force chamber. There are known devices that control flow control valves, pressure control valves, etc. for controlling pressure, but the main pump that supplies oil to the power auxiliary device and the sub pump that supplies oil to the vehicle speed response device are common. Normally, the necessary oil is secured from the oil tank of the engine.

Therefore, the oil supply ports for the main pump and sub-pump of the oil tank are provided at the bottom of the oil tank, respectively, so that the oil in the oil tank can be used to the maximum extent.

However, providing the oil supply port to the sub-pump at the bottom of the oil tank means that if an oil leak occurs in the piping system of the sub-pump, all of the oil in the oil tank will flow out, which may affect the safety of the power steering system. Unfavorable above.

In other words, in the above case, even though there is no problem with the piping system to the main pump, the oil in the oil tank flows out from the oil supply port to the sub pump, and the oil in the oil tank runs out. Oil will not be secured.

As a result, the supply of oil from the main pump to the power auxiliary device is interrupted, making it impossible for the power steering device to function properly, and the main pump may seize and break, causing engine trouble.

In this invention, the oil supply port to the sub-pump of the oil tank is provided on the side of the oil tank and above the oil level of the amount of oil required for the operation of the main pump. Even if there is a spill, the amount of oil necessary to operate the main pump can be secured in the oil tank, and the main pump can operate normally as long as there is no abnormality in the piping system of the main pump. be.

Hereinafter, the present invention will be explained in detail based on examples.

Reference numeral 1 denotes an oil tank, and the oil tank 1 contains the amount of oil necessary for operating the main pump 6 and power auxiliary device 8 (position of oil level B in the figure), and the operation of the sub pump 9 and vehicle speed response device 10. The tank is filled with the same amount of oil as is required for (oil level A in the diagram).

The oil supply port 2 is provided at the bottom of the oil tank 1,
It is connected to the main pump 6 through a conduit 15, and oil is supplied from the oil supply port 2 through the main pump 6 to the power auxiliary device 8 of the steering device 7, which is connected to the main pump 6 through a conduit 16.

The oil supply port 3 is located on the side of the oil tank 1 and on the oil level B.
The oil is supplied from the oil supply port 3 through the sub-pump 9 to the vehicle speed response device 10 of the steering device 7, which is connected to the sub-pump 9 via a conduit 18. Supplied.

Reference numerals 4 and 5 denote oil return ports, which are provided at a position above the oil level A on the side surface of the oil tank, and which are connected to the power auxiliary device 8 and the vehicle speed response device 10 through conduits 1, respectively.
9.20, which prevents backflow of oil and returns the oil from the power auxiliary device 8 and vehicle speed response device 10 into the oil tank 1.

Reference numeral 11 denotes an oil damper of the oil level B position type, or an oil damper with an open center, which is placed in the oil slightly below.

12 is an oil inlet, 13 is a lid, and 14 is an oil filter, which filters oil when oil is injected through the oil inlet 12, and a barrier 21 provided at the bottom of the oil filter 14 and the barrier. A seal 22 provided between the oil return port 21 and the oil filter 14 ensures that the oil returned from the oil return ports 4 and 5 is filtered by the oil filter 14 without returning directly to the tank.

As explained above, under normal conditions, the oil tank 1 is filled with oil up to the oil level A, and the main pump 6 and sub pump 9
The amount of oil is sufficient to allow the power auxiliary device 8 of the steering device 7 and the vehicle speed response device 10 to operate normally.
If an oil leak occurs in the piping system of the sub-pump 9, only the oil on the top surface of the supply port 3 will flow out from the oil supply port 3 to the sub-pump 9, and the main pump system will not operate until the required oil amount reaches the oil level. B position, that is, the oil supply port 3
Since it is located lower than the main body, it is secured sufficiently and the function of the power steering device is maintained.

The oil damper 11 also suppresses oil splashing due to vibrations in the above-mentioned situation, and has the effect of preventing oil droplets from flowing out from the oil supply port 3 on the sub-pump side.

In the embodiment, the oil damper 11 has an open center, but it is clear that it may have any shape other than a net shape as long as it can suppress the oil from flying out.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention. 1... Oil tank, 2, 3... Oil supply port, 4, 5... Oil return port, 6...
Main pump, 7 Steering device, Power auxiliary device, 9 Sub pump, 10 Vehicle speed response device, 11... ...
oil damper.

Claims (2)

[Scope of utility model registration request] (1) In the oil tank of a vehicle speed responsive power steering system that secures the amount of oil necessary for the main pump that supplies oil to the power auxiliary device and the sub pump that supplies oil to the vehicle speed responsive device to operate, the main pump supplies oil to the vehicle speed responsive device. An oil tank for a vehicle speed-responsive power steering device, characterized in that an oil supply port for the sub-pump is provided above the oil level of the amount of oil necessary for operation of the pump. (2) The vehicle speed responsive type according to claim 1 of the registered utility model, characterized in that an oil damper with a net shape or an open center is disposed in the oil slightly below the oil supply port to the sub-pump. Oil tank for power steering system.