Variable mechanism for closed system high-pressure axial plunger two-way variable pump
By adopting a split-type swing plate and servo link, the swing angle is directly feedback, which solves the problem that the accuracy of the axial plunger bidirectional variable pump variable mechanism in the existing technology, and achieves higher control accuracy and stability sex.
Patent Information
- Application Number
- CN202421224173.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The existing axial plunger bidirectional variable pump variable mechanism is difficult to ensure accuracy during processing, resulting in poor control accuracy.
The swash plate and servo connecting rod with a split structure are connected to the servo connecting rod and variable cylinder through screws. The servo connecting rod is equipped with a feedback rod directly feedback the swash plate swing angle. The servo spring contacts the swash plate through the guide rail, which simplifies the Processing process and improves accuracy.
The processing difficulty is reduced and the accuracy and stability of variable control are improved through direct feedback swing angle.
Smart Images
Figure CN222315300U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a variable mechanism, in particular to a variable mechanism for a high-pressure axial plunger bidirectional variable pump in a closed system. Background Art
[0002] With the development of the national economy, the application of hydraulic technology has become more and more extensive, and it has become an important indicator of a country's industrial level. Compared with mechanical transmission, hydraulic transmission has the advantages of convenient control, good dynamic performance, and flexible component layout. It is widely used in machine tools, agricultural and forestry machinery, metallurgical machinery, plastic machinery, civil industry and other industries, especially in the field of engineering machinery. Since the closed hydraulic system not only has low energy consumption in its circuit, but also has a high degree of structural compactness, it can easily achieve infinitely variable speed, so it is widely used in engineering machinery hydraulic systems. The axial piston bidirectional variable pump is the power element in the closed hydraulic system. It is generally composed of a variable mechanism, a control mechanism, a heart component, a housing, and a back cover. The quality of the variable mechanism directly affects the control performance of the pump.
[0003] The existing axial piston bidirectional variable pump variable mechanism, the swash plate and the servo connecting rod are difficult to forge and process as a whole, and the accuracy is difficult to guarantee; the servo spring is installed in the variable cylinder, and the swash plate swing angle feedback is indirectly fed back to the control valve through the variable cylinder. In this way, the accuracy of the variable cylinder is high, which is difficult to guarantee in processing, resulting in poor variable control accuracy of the axial piston bidirectional variable pump. Utility Model Content
[0004] The utility model aims to provide a variable mechanism for a high-pressure axial piston bidirectional variable pump in a closed system, which has low processing difficulty and stable and high feedback accuracy.
[0005] The technical solution of the utility model is as follows: a variable mechanism of a high-pressure axial piston bidirectional variable pump for a closed system, comprising a swash plate, a servo connecting rod is provided at one end of the swash plate through a screw, the servo connecting rod is connected to a variable cylinder through a variable slider, both ends of the variable cylinder are provided with grid rings, and a feedback rod for feeding back the swing angle of the swash plate is provided on the servo connecting rod; the other end of the swash plate is connected to a swash plate guide rail assembly that can cooperate with the swash plate for movement, and a servo spring is provided on the swash plate guide rail assembly through a spring seat.
[0006] In the aforementioned variable mechanism of a high-pressure axial piston bidirectional variable pump for a closed system, the swash plate guide rail assembly includes a cover plate, a limit seat is provided in the cover plate, the limit seat is perpendicular to the cover plate and fixed by a sealing locking nut, a guide rail frame that can move relative to the limit seat is provided on one side of the cover plate, and a right guide rail piece and a left guide rail piece are respectively provided on both sides of the guide rail frame for guiding and limiting the guide rail frame, and a sealing ring is provided on the cover plate.
[0007] The aforementioned one is used in the variable mechanism of a high-pressure axial piston bidirectional variable pump in a closed system, and the sealing ring is an O-type rubber ring.
[0008] In the aforementioned variable mechanism of a high-pressure axial piston bidirectional variable pump for a closed system, a guide groove corresponding to the limit seat is provided in the guide rail frame.
[0009] Compared with the prior art, the swash plate and servo connecting rod of the utility model are split structures with low processing difficulty, and the swash plate swing angle can be directly fed back to the control valve through the feedback rod fixed on the servo connecting rod. The servo spring is connected to the swash plate through the guide rail frame, and the variable control accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the utility model;
[0011] Figure 2 It is a structural schematic diagram of the swash plate guide rail assembly of the utility model;
[0012] Figure 3 It is a structural schematic diagram of the utility model when in use.
[0013] The marks in the accompanying drawings are: 1-Glay ring, 2-variable cylinder, 3-variable slider, 4-spring seat, 5-servo spring, 6-swash plate guide rail assembly, 7-swash plate, 8-servo connecting rod, 9-screw, 10-feedback rod, 11-limit seat, 12-sealing ring, 13-cover plate, 14-guide groove, 15-guide rail frame, 16-right guide rail piece, 17-left guide rail piece. DETAILED DESCRIPTION
[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0015] Embodiment. A variable displacement mechanism for a high-pressure axial piston bidirectional variable displacement pump in a closed system, comprising: Figure 1-3 As shown, it includes a swash plate 7, one end of which is provided with a servo connecting rod 8 through a screw 9, the servo connecting rod 8 is connected to the variable cylinder 2 through a variable slider 3, both ends of the variable cylinder 2 are provided with grid rings 1, and the servo connecting rod 8 is provided with a feedback rod 10 for feeding back the swing angle of the swash plate 7; the other end of the swash plate 7 is connected to a swash plate guide rail assembly 6 that can cooperate with the swash plate 7 for movement, and the swash plate guide rail assembly 6 is provided with a servo spring 5 through a spring seat 4.
[0016] The swash plate guide rail assembly 6 includes a cover plate 13, in which a limit seat 11 is provided which is perpendicular to the cover plate 13 and fixed by a sealing locking nut, a guide rail frame 15 which can move relative to the limit seat 11 is provided on one side of the cover plate 13, and a right guide rail piece 16 and a left guide rail piece 17 are provided on both sides of the guide rail frame 15 for guiding and limiting the guide rail frame 15, and a sealing ring 12 is provided on the cover plate 13.
[0017] The sealing ring 12 is an O-type rubber ring.
[0018] The guide rail frame 15 is provided with a guide groove 14 corresponding to the limit seat 11 .
[0019] Principle of the utility model: During the movement of the variable cylinder 2, the servo connecting rod 8 can drive the swash plate 7 to rotate. The swash plate 7 and the servo connecting rod 8 of the present application are split structures, which are fixed by screws 9, and the processing difficulty is small. During the swinging of the swash plate 7, the guide rail frame 15 will be pushed to move along the guide rail formed by the right guide rail piece 16 and the left guide rail piece 17, and the guide groove 14 in the swash plate 7 will cooperate with the limit seat 11 to achieve further guiding and limiting effects, and the movement is more reliable. During the movement of the guide rail frame 15, the spring seat 14 on the guide rail frame 15 will compress the servo spring 5. At this time, the rotation angle of the lower plate 7 can be fed back to the control valve through the feedback rod 10 to achieve closed-loop control, and the control is stable and accurate.
Claims
1. A variable displacement mechanism for a high-pressure axial piston bidirectional variable displacement pump in a closed system, characterized in that: The invention comprises a swash plate (7), one end of which is provided with a servo connecting rod (8) via a screw (9), the servo connecting rod (8) being connected to a variable cylinder (2) via a variable slider (3), both ends of the variable cylinder (2) being provided with grid rings (1), and the servo connecting rod (8) being provided with a feedback rod (10) for feeding back the swing angle of the swash plate (7); the other end of the swash plate (7) being connected with a swash plate guide rail assembly (6) which can cooperate with the swash plate (7) for movement, and a servo spring (5) being provided on the swash plate guide rail assembly (6) via a spring seat (4).
2. The variable displacement mechanism of a high-pressure axial piston bidirectional variable displacement pump for a closed system according to claim 1, characterized in that: The swash plate guide rail assembly (6) comprises a cover plate (13), a limit seat (11) is provided in the cover plate (13) and is perpendicular to the cover plate (13) and fixed by a sealing locking nut, a guide rail frame (15) is provided on one side of the cover plate (13) and is movable relative to the limit seat (11), a right guide rail piece (16) and a left guide rail piece (17) are provided on both sides of the guide rail frame (15) for guiding and limiting the guide rail frame (15), and a sealing ring (12) is provided on the cover plate (13).
3. The variable displacement mechanism of a high-pressure axial piston bidirectional variable displacement pump for a closed system according to claim 2, characterized in that: The sealing ring (12) is an O-type rubber ring.
4. The variable displacement mechanism of a high-pressure axial piston bidirectional variable displacement pump for a closed system according to claim 2, characterized in that: The guide rail frame (15) is provided with a guide groove (14) corresponding to the limit seat (11).