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Hydraulic shock absorber

A hydraulic buffer and damping force technology, which is applied in the field of hydraulic buffers, can solve the problems of inability to generate damping force, decrease in comfort and driving stability, and increase in vehicle body swing

Active Publication Date: 2014-10-29
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in a semi-active damper control system (Semiactibudamp system Yustem) of a railway vehicle provided with a damping force adjustment type uniflow hydraulic shock absorber, for example, if the extension side damping force generating mechanism (hereinafter referred to as extension side solenoid valve) is fixed on the soft characteristic side (hereinafter referred to as soft fixation (nft fixation)), and in the state where hard characteristics are required, the desired damping force cannot be generated.
As a result, the swing of the vehicle body increases, and the comfort and driving stability of the vehicle decrease.

Method used

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no. 1 approach

[0038] A first embodiment of the present invention will be described with reference to the drawings. It should be noted that, in the first embodiment, as the hydraulic shock absorber, although a single-flow type hydraulic shock absorber (shock absorber) used in a semi-active shock absorber control system of a railway vehicle is listed, it should not be The hydraulic shock absorber of the present invention is defined.

[0039] figure 1 It is an explanatory diagram of a semi-active damper control system (hereinafter, referred to as "control system" as necessary) including the single-flow type hydraulic shock absorber 1 of the first embodiment. Such as figure 1 As shown, the control system has: to the lateral direction of the railway vehicle ( figure 1 The left and right directions in the middle) relatively move and install the hydraulic buffer 1 (hydraulic buffer) between the trolley 31 and the vehicle body 32 (between components); the acceleration sensor 33 installed on the ...

no. 2 approach

[0069] A second embodiment of the present invention will be described based on the drawings. In addition, the same name and the same code|symbol are attached|subjected to the same or the same structure as said 1st Embodiment. In order to simplify the description of the specification, descriptions that overlap with the first embodiment are omitted. Such as Figure 8 As shown, the single-flow hydraulic shock absorber 51 of the second embodiment is the second on-off valve provided on the flow path 40 of the semi-active shock absorber control system in the single-flow hydraulic shock absorber 1 of the first embodiment. 42 (see image 3 , Figure 4, Figure 5 ) is replaced by a pilot-operated shut-off valve 52.

[0070] The pilot type stop valve 52 is switched from an open state to a closed state when the pressure of the flow path 37 (pilot flow path 54 ) becomes high and reaches a preset pilot pressure. see Figure 7 As can be seen from the graph shown, the proportional sol...

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Abstract

The present invention provides a hydraulic shock absorber capable of detecting that a damping force generation mechanism is stuck at a soft characteristic. When a state having abnormality is maintained for a certain time period with the proportional solenoid valves 26 and 27 fixed at a hard side, a controller determines that the proportional solenoid valve 26 or the proportional solenoid valve 27 is stuck at a soft side, and switches a control mode from a failure mode to a passive mode. As a result, even when the proportional solenoid valve 26 or the proportional solenoid valve 27 is stuck at the soft side, it is possible to secure a ride comfort and running stability of a vehicle.

Description

technical field [0001] The invention relates to a hydraulic buffer. Background technique [0002] Conventionally, there is known a damping force adjustment type hydraulic shock absorber provided with an extension-side damping force generating mechanism and a contraction-side damping force generating mechanism driven by solenoids (for example, refer to Patent Document 1). [0003] current technology [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 9-264364 [0005] However, in a semi-active damper control system (Semiactibudampa system Yustem) of a railway vehicle provided with a damping force adjustment type uniflow type hydraulic shock absorber, for example, if the extension side damping force generating mechanism The solenoid valve (hereinafter referred to as extension side solenoid valve) is fixed on the soft characteristic side (hereinafter referred to as soft fixation (nft fixation)), and in a state where hard characteristics are required, a desir...

Claims

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Application Information

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IPC IPC(8): F16F9/40F16F9/34
CPCB60G2600/08B61F5/24F16F9/3264B60G17/06B60G2300/10B61F5/245
Inventor 柴原和晶
Owner HITACHI ASTEMO LTD