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Hydraulic motor trouble detector

A hydraulic motor and fault detection technology, which is applied in the direction of fluid pressure actuators, servo motors, control devices, etc., can solve the problems of transmission device driving influence, transmission oil performance deterioration, driving performance deterioration, etc.

Inactive Publication Date: 2005-08-10
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the interior of the transmission will be filled with oil, which will act as a large resistance on the transmission, and the driving performance will deteriorate.
Moreover, when the oil from the hydraulic motor is mixed into the transmission oil, the performance of the transmission oil will deteriorate, which may have a bad influence on the drive of the transmission.

Method used

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  • Hydraulic motor trouble detector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0029] Below, use Figure 1 ~ Figure 4 A wheeled hydraulic excavator equipped with the failure detection device according to the first embodiment of the present invention will be described. In the wheel hydraulic excavator, a wheel-type (tyre-type) traveling body is rotatably mounted with a revolving body, and attachments for work are attached to the revolving body. set on the running body by figure 1 The traveling hydraulic motor 1 driven by the traveling hydraulic circuit is shown.

[0030] Such as figure 1 As shown, the oil discharged from the main pump 3 driven by the engine 2 is controlled by the control valve 4 in its direction and flow rate, and supplied to the travel motor 1 via the brake valve 6 with the built-in back pressure valve 5 . A transmission 7 is coupled to an output shaft 1 a of the travel motor 1 . The rotation of the travel motor 1 is shifted by the transmission 7 and transmitted to the tires 10 via the drive shaft 8 and the wheel shaft 9 . Therefore...

no. 2 approach

[0057] When the traveling motor 1 rotates at a high speed, the frictional force of the sliding part of the piston 42 increases, the piston 42 is sintered, and the traveling motor 1 may be damaged. Therefore, in the second embodiment, when the rotation speed of the travel motor 1 increases to more than the predetermined value Na, a sign of failure of the travel motor 1 is detected. Below, according to Figure 5 , 6 A second embodiment of the present invention will be described. Figure 5 It is a circuit diagram showing the structure of a wheeled hydraulic excavator equipped with a failure detection device according to a second embodiment. Image 6 It is a schematic diagram illustrating the controller 30A of the second embodiment in detail. In addition, in the same figure 1 , 3 The same parts are given the same reference numerals, and the differences will be mainly described below.

[0058] Such as Figure 5 As shown, a rotational speed sensor 26 for detecting the rotatio...

no. 3 approach

[0061] In the third embodiment, a precursor to failure of the travel motor 1 is detected when cavitation occurs. Below, according to Figure 7 , 8 A third embodiment of the present invention will be described. Figure 7 is a circuit diagram showing the structure of a wheeled hydraulic excavator equipped with a failure detection device according to a third embodiment, Figure 8 It is a schematic diagram showing the structure of the controller 30B of the third embodiment. Also, for figure 1, 3 The same reference numerals are assigned to the same parts, and the differences will be mainly described below.

[0062] Such as Figure 7 As shown, pressure sensors 27-29 are arranged on the inlet and outlet ports of the travel motor 1 and the supplementary port 13, and the motor inlet pressures during forward rotation, reverse rotation and braking of the motor are detected by these pressure sensors 27-29. Such as Figure 8 As shown, the function generators 322-324 output a high p...

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PUM

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Abstract

A failure detection device for a hydraulic motor according to the present comprises a hydraulic pump (3) that is driven by a prime mover (2); a hydraulic motor (1) that is driven by hydraulic oil discharged from the hydraulic pump (3) ; an abnormality detection device (35) that detects a sign of abnormal operation of the hydraulic motor (1); and a warning device (39, 40) that issues a warning when the sign of the abnormal operation of the hydraulic motor (1) is detected by the abnormality detection device (35).

Description

technical field [0001] The invention relates to a device for detecting failure of a hydraulic motor mounted on a hydraulically driven vehicle such as a wheeled hydraulic excavator. Background technique [0002] Generally, a hydraulically driven vehicle such as a wheeled hydraulic excavator has a hydraulic pump and a traveling hydraulic motor driven by oil discharged from the hydraulic pump. The output shaft of the hydraulic motor is connected to the input shaft of the transmission, and the rotation of the hydraulic motor is transmitted to the wheels via the transmission. The hydraulic motor is provided with a discharge chamber, and the oil discharged from the hydraulic motor is collected into the oil tank through the discharge chamber. [0003] In the above-mentioned hydraulically driven vehicle, when the pressure oil supplied to the hydraulic motor is at a high temperature due to damage such as the hydraulic machine or the oil cooler, the viscosity of the pressure oil decr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/02F15B19/00F16H59/26F16H59/36F16H59/72F16H61/12F16H61/40F16H61/4192
CPCF16H2059/6861B60G2800/802F16H2061/1216F16H59/26F15B19/005B60W2050/021F16H59/40F16H59/36F16H59/72F16H61/40B60G2600/08F16H61/4192B60W2050/0295B60W10/06F16H61/4148F16H61/12
Inventor 一村和弘
Owner NIHON KENKI CO LTD
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