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Hydraulic control system having accumulator

a technology of hydraulic control system and accumulator, which is applied in the direction of positive displacement liquid engine, pump, machine/engine, etc., can solve the problems of hydraulic fluid not being delivered to the lubrication spot through the regulator valve, loss of hydraulic pressure, etc., to achieve the effect of reducing power loss, increasing flow volume, and simplifying the structure of hydraulic control system

Inactive Publication Date: 2013-12-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a hydraulic control system for vehicles. The main technical effects of the invention include the prevention of a shortage of fluid at the constant delivery site when charging the accumulator, reduction of power loss, and simplification of the hydraulic control system structure. This is achieved by using a flow volume increasing device, such as a jet pump or an electric pump, to deliver additional fluid to the constant delivery site and compensating for any deficiency of fluid through discharge control of the electric pump. This system reduces the risk of shortage of lubricating or cooling fluid and simplifies maintenance.

Problems solved by technology

That is, cessation of engine or motor operation will result in a loss of hydraulic pressure.
In this situation, therefore, it is difficult to sufficiently lubricate the lubrication spot and cool the cooling spot due to lack of hydraulic fluid.
Therefore, the hydraulic fluid cannot be delivered sufficiently to the lubrication spots through the regulator valve when charging the accumulator by delivering high pressured fluid thereto.
In addition, an engine-driven mechanical oil pump incapable of varying a discharge rate thereof is used in the hydraulic control system for automobiles in most cases.
As such, the lubrication spots will not be lubricated sufficiently and the cooling spots will not be cooled sufficiently during accumulator charging.

Method used

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  • Hydraulic control system having accumulator
  • Hydraulic control system having accumulator
  • Hydraulic control system having accumulator

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Embodiment Construction

[0035]Referring now to FIG. 1, there is shown an example of applying the hydraulic control system of the invention to a continuously variable transmission used in an automobile. The continuously variable transmission 1 is a conventional belt-driven CVT comprising a drive pulley 2, a driven pulley 3 and a belt 4 mounted driveably on those pulleys 2 and 3 to transmit a torque therebetween. Each pulley 2 and 3 comprises a fixed sheave and a movable sheave being adapted for movement toward and away from the fixed sheave, and inwardly facing conical faces of the sheaves form a V-groove for holding the belt 4 therebetween. In order to move the movable sheaves axially, the pulleys 2, 3 are provided individually with hydraulic actuators 5, 6. In this preferred example, the movable sheave of the driven pulley 3 is moved axially in response to the application of pressurized hydraulic fluid to the actuator 6 thereby establishing a clamping pressure for clamping the belt 4 by the driven pulley ...

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Abstract

A hydraulic control system for preventing shortage of lubricant and coolant during charging of an accumulator is disclosed. The hydraulic control system is comprised of: a hydraulic pump; an accumulator for storing fluid from the pump; and a constant delivery site which is connected to the pump in parallel with the accumulator, and which requires hydraulic fluid constantly during activation of the hydraulic pump. A pressure level of the fluid discharged from the pump is regulated to a level possible to be delivered to the accumulator, and the fluid resulting from the pressure regulation is delivered to the constant delivery site. Meanwhile, a pressure higher than that required by the constant delivery site is stored in the accumulator. The hydraulic control system is characterized by a fluid increasing means that delivers additional fluid to the constant delivery site together with the fluid resulting from said pressure regulation, when delivering the fluid discharged from the pump to the accumulator.

Description

TECHNICAL FIELD[0001]This invention relates to a hydraulic control system for delivering hydraulic fluid to various types of actuators and lubrication points, while storing hydraulic pressure in an accumulator.BACKGROUND ART[0002]Various kinds of actuating mechanisms are actuated hydraulically, and hydraulic fluid is partially used for cooling and lubrication. Usually, the hydraulic pressure is established by a hydraulic pump driven by an engine or a motor. That is, cessation of engine or motor operation will result in a loss of hydraulic pressure. In order to maintain the hydraulic pressure to continue an operation in progress in case of stopping the hydraulic pump, an accumulator is used in a conventional hydraulic system. For example, conventional hydraulic control devices are disclosed in Japanese Patent Laid-Open No. 2004-84928 and International Publication No. 2010 / 021218.[0003]The control devices disclosed in those publications are used to control a transmission. According to...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B17/03
CPCF04B17/03F15B1/024F16H2061/0034F16H2061/0037F16H61/0031F16H61/0025
Inventor YOSHIDA, MICHIOINAGAWA, TOMOKAZU
Owner TOYOTA JIDOSHA KK
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