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Manual displacement control arrangement for axial piston pump

A technology of axial piston pump, control device, applied in the direction of pump control, reciprocating piston engine, pump, etc., can solve the problem of impossible machine stop

Active Publication Date: 2019-08-02
DANFOSS POWER SOLUTIONS GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In any other case machine stop is never possible as one of the two units is always outside the hydraulic center

Method used

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  • Manual displacement control arrangement for axial piston pump
  • Manual displacement control arrangement for axial piston pump
  • Manual displacement control arrangement for axial piston pump

Examples

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Embodiment Construction

[0036] figure 1 A hydraulic circuit diagram of an exemplary hydraulic pump 100 with a displacement control device 1 according to the invention is schematically shown. The displacement control device 1 is fed pressurized hydraulic fluid via a charge pressure line 50 , which leads from the hydrostatic piston pump 100 to the charge pressure port P of the displacement control device 1 . according to figure 1 The displacement control device 1 is shown in a neutral position, wherein the hydrostatic piston pump 100 does not exhibit any displacement volume. Thus, both servo pressure ports A and B are connected via respective discharge ports T to the discharge line 60 connected to the tank 80 . Thus, both servo piston sides 35A and 35B of the servo piston 35 are at the same pressure level (here tank pressure level) and the servo piston 35 is centered via its servo piston springs 37A and 37B. Consequently, the displacement element 4 of the hydrostatic piston pump 100 is also in its n...

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Abstract

Displacement control device (1) for variably adjusting the displacement of an axial piston hydraulic pump comprising a rotary shaft (10) mounted in a housing (20) and rotatable around a shaft axis (13) of the rotary shaft (10). The rotary shaft (10) having a first end (11) and a second end (12), wherein to the second end (12), which protrudes outside of the housing (20), a torque can be applied for rotating the rotary shaft (10) to open and close servo pressure lines (40, 45) arranged within the housing (20). The servo pressure lines (40, 45) can conduct hydraulic fluid to and from a servo adjusting unit capable to adjust the displacement volume of the axial piston hydraulic pump. The rotary shaft (10) further comprising a mid-portion (14) located between the first end (11) and second end(12). Concentric to the shaft axis (13) in the mid-portion (14) of the rotary shaft (10) a detent sleeve (5) is positioned comprising an abutment area (7) onto which, in the neutral position of the displacement control device (1), a sliding element (8) abuts, which is mounted pre-stressed in the housing exerting a resilient force onto the detent sleeve (5) perpendicular to the shaft axis (13), wherein the detent sleeve (5), in operating conditions of the displacement control device (1) is rotatable fixed with the rotary shaft (10) and turns with the rotary shaft (10). However, for neutral position adjustments in non-operating conditions, the detent sleeve (5) and the rotary shaft (10) are detachable from each other such that the rotary shaft (10) can be turned relative and independently within the detent sleeve (5), which is held in its neutral position by the sliding element (8).

Description

[0001] Cross References to Related Applications [0002] This application is related to the earlier application DE 10 2016 226 039.1 filed on 22.12.2016. technical field [0003] The invention relates to a displacement control device for variably adjusting the displacement of an axial piston hydraulic pump, in particular to a manual displacement control device. A displacement control device according to the invention and according to the preamble of claim 1 comprises a rotary shaft mounted in a housing and rotatable about a rotary shaft axis of the rotary shaft. The rotary shaft has a first end and a second end, wherein torque can be applied to the second end protruding outside the housing to rotate the rotary shaft to open and close a servo pressure line disposed within the housing. These servo pressure lines can conduct hydraulic fluid to and from a servo adjustment unit capable of adjusting the displacement volume of the axial piston hydraulic pump. The rotational shaft f...

Claims

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Application Information

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IPC IPC(8): F04B1/08F04B1/29F04B1/32F04B49/00F04B49/08F04B49/12F03C1/40
CPCF04B1/08F04B1/29F04B1/324F04B49/002F04B49/08F04B49/12F03C1/0686F04B1/07F04B1/295F04B1/146
Inventor 米罗斯拉夫·卡玛迪尔让·雅各博维克鲁博斯·卡玛迪尔皮特·克里斯萨克
Owner DANFOSS POWER SOLUTIONS GMBH & CO