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Construction machine

A technology for construction machinery and working oil, which is used in mechanical equipment, earthmoving machines/shovels, brakes, etc. It can solve the problem that the oil pressure of the oil pressure circuit for parking brakes is reduced, the check valve cannot be set, and the leakage is large. And other issues

Inactive Publication Date: 2014-04-16
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as the oil pressure of the hydraulic oil supply circuit decreases during gear shifting, the amount of leakage of hydraulic oil from the hydraulic circuit for the parking brake to the hydraulic oil supply circuit side becomes excessive, and the hydraulic pressure of the hydraulic circuit for the parking brake decreases. To the benefit of setting a one-way valve

Method used

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no. 1 example

[0024] A first embodiment of the present invention will be described below with reference to the drawings. In the second embodiment to be described later, the same reference numerals are assigned to the same structural parts and parts with the same functions as those of the first embodiment described below, and the description thereof will be simplified or omitted.

[0025] figure 1 It is a side view showing the wheel loader 1 of this embodiment.

[0026] figure 1 Among them, the wheel loader 1 is a construction machine that transports excavated soil, sand, and the like and loads them to a truck or the like. This wheel loader 1 includes a working machine frame 2 and a vehicle body frame 3 .

[0027] The working machine frame 2 is capable of swinging within a predetermined hinge angle range with respect to the vehicle body frame 3 with a center pin axis (not shown) as a swing center axis. That is, the wheel loader 1 is a vehicle having an articulated structure of frames 2 ,...

no. 2 example

[0053] Next, follow image 3 The wheel loader 1 provided with the parking brake hydraulic circuit 5 according to the second embodiment of the present invention will be described.

[0054] In the hydraulic circuit 5 for the parking brake of the wheel loader 1 of the first embodiment, when the oil pressure on the side of the parking brake 4 exceeds the relief pressure, the relief valve 73 makes the working oil on the side of the parking brake 4 to work. Fuel tank 8 flows out.

[0055] relatively, in image 3 In the parking brake hydraulic circuit 5 of the wheel loader 1 shown in the second embodiment, when the difference between the hydraulic pressure on the parking brake 4 side and the hydraulic oil supply circuit 6 side exceeds the relief pressure, then The relief valve 73 is different in that the hydraulic oil on the parking brake 4 side flows out to the hydraulic oil supply circuit 6 .

[0056] According to the wheel loader 1 of the second embodiment, by setting the relie...

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PUM

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Abstract

A construction machine includes: a negative parking brake (4) whose braking state is released by supply of hydraulic fluid; and a parking brake hydraulic circuit (5) that is branched from a hydraulic fluid supplying circuit (6) supplying the hydraulic fluid to a transmission of the construction machine and supplies the hydraulic fluid to the parking brake (4). The parking brake hydraulic circuit (5) includes: a check valve (72) that prevents backflow of the hydraulic fluid of the parking brake (4) to the hydraulic fluid supplying circuit (6); an operation switching valve (71) that is provided closer to the parking brake (4) than the check valve (72) and switches between an activation and a release of the parking brake (4); and a relief valve (73) that is interposed between the check valve (72) and the operation switching valve (71) and discharges the hydraulic fluid of the parking brake (4) when the relief valve (73) is opened.

Description

technical field [0001] The present invention relates to a construction machine provided with a hydraulic circuit for a reverse parking brake. Background technique [0002] Construction machines such as wheel loaders use so-called reverse parking brakes, which discharge hydraulic oil in a brake cylinder and apply the brakes with the biasing force of a spring or the like (see, for example, Patent Document 1). Such a parking brake releases the parking brake by supplying hydraulic oil to the brake cylinder through the hydraulic circuit for the parking brake. [0003] However, some hydraulic circuits for parking brakes of construction machines are connected to a working oil supply circuit that supplies working oil to a transmission, and the working oil is supplied from the working oil supply circuit. At this time, since the hydraulic oil flows into the transmission during operation such as shifting of the transmission, the oil pressure of the hydraulic oil supply circuit may tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/22E02F9/22F16H61/00
CPCE02F9/2083E02F9/226E02F9/2217B60T13/22E02F9/2292
Inventor 内藤启太冈俊治高鸟修
Owner KOMATSU LTD