A power control valve block, a hydraulic pump assembly and construction machinery
A technology of power control valves and hydraulic pumps, which is applied in mechanical equipment, servo motor components, fluid pressure actuators, etc., can solve the problems of high maintenance costs and high costs of closed pumps, and achieve the effect of increasing flexibility and reducing costs
Active Publication Date: 2020-12-22
WEICHAI POWER CO LTD +1
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- Application Information
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Problems solved by technology
[0003] However, the cost of a closed pump with power control function is high, and the maintenance cost is high during later use
Method used
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[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.
[0036] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...
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The invention discloses a power control valve block, a hydraulic pump assembly and an engineering machine and belongs to the technical field of engineering machinery. The power control valve block comprises a power limiting valve, a first shuttle valve and a second shuttle valve. The power limiting valve comprises a valve body, a control end and a power adjusting portion, wherein the control end and the power adjusting portion are arranged on the two sides of the valve body correspondingly. Two oil inlets of the first shuttle valve communicate with two control oil channels of a bidirectional variable-displacement pump correspondingly, and an oil outlet of the first shuttle valve can selectively communicate with an oil tank through the power limiting valve. Two oil inlets of the second shuttle valve can communicate with two work main oil channels of the bidirectional variable-displacement pump correspondingly, and an oil outlet of the second shuttle valve communicates with the control end so as to control the work station of the power limiting valve. The hydraulic pump assembly comprises the power control valve block. The engineering machine comprises the hydraulic pump assembly. By means of the power control valve block, the power control valve block can be combined with a hydraulic pump without the power control function so as to form a hydraulic pump assembly with the power control function, and therefore the cost of a hydraulic system can be lowered.
Description
technical field [0001] The invention relates to the technical field of construction machinery, in particular to a power control valve block, a hydraulic pump assembly and construction machinery. Background technique [0002] The walking system of construction machinery usually adopts a closed hydraulic circuit, and some working conditions require constant power control or maximum power limitation. In this case, a closed pump with power control function is required. The closed pump with power control function is equipped with a pilot variable cylinder, and there are springs on both sides of the pilot variable cylinder. When the system pressure on one side reaches the set value of the spring, the piston of the pilot variable cylinder is pushed to move, thereby reducing the pressure of the closed pump. displacement. [0003] However, the cost of a closed pump with power control function is high, and the maintenance cost is high during later use. [0004] Therefore, there is a...
Claims
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IPC IPC(8): F15B13/02F15B11/17F15B15/14
CPCF15B11/17F15B13/025F15B15/1423F15B15/1457
Inventor 张立彬李海军赵华
Owner WEICHAI POWER CO LTD