阅读说明：本技术 一种用于液压泵的变量调节机构 (Variable regulating mechanism for hydraulic pump ) 是由 吴茂民 赵德禄 党超 马兴家 胡洪林 于 2021-06-07 设计创作，主要内容包括：本发明公开了一种用于液压泵的变量调节机构,包括位于壳体内的随动活塞套筒,随动活塞套筒上端设有分油盖,随动活塞套筒内套设有随动活塞,随动活塞与随动活塞套筒的内孔之间设有随动腔；随动活塞底端与斜盘相配合。本发明通过随动活塞套筒将壳体与分油盖连接于一体,随动活塞与随动活塞套筒的内孔之间形成随动腔,改变了现有技术中随动活塞与壳体内孔壁相对运动时导致壳体内孔易变形的情况,有效提高随动活塞运动的稳定性,改善了液压柱塞泵流量、压力调节的可靠性,提高了液压泵乃至液压系统的安全性。综上所述,本发明具有能够提高随动活塞运动稳定性以及有效减少渗漏油现象发生的特点。(The invention discloses a variable regulating mechanism for a hydraulic pump, which comprises a follow-up piston sleeve positioned in a shell, wherein the upper end of the follow-up piston sleeve is provided with an oil distribution cover; the bottom end of the follow-up piston is matched with the swash plate. According to the invention, the shell and the oil distribution cover are connected into a whole through the follow-up piston sleeve, and the follow-up cavity is formed between the follow-up piston and the inner hole of the follow-up piston sleeve, so that the condition that the inner hole of the shell is easy to deform when the follow-up piston and the inner hole wall of the shell move relatively in the prior art is changed, the movement stability of the follow-up piston is effectively improved, the flow and pressure regulation reliability of the hydraulic plunger pump is improved, and the safety of the hydraulic pump and even a hydraulic system is improved. In conclusion, the servo piston has the characteristics of improving the motion stability of the servo piston and effectively reducing the oil leakage phenomenon.)

1. A variable displacement adjustment mechanism for a hydraulic pump, characterized by: the servo oil distributor comprises a servo piston sleeve (5) positioned in a shell (7), wherein an oil distribution cover (1) is arranged at the upper end of the servo piston sleeve (5), a servo piston (6) is sleeved in the servo piston sleeve (5), and a servo cavity is arranged between the servo piston (6) and an inner hole of the servo piston sleeve (5); the bottom end of the follow-up piston (6) is matched with the swash plate (8).

2. A variable displacement regulating mechanism for a hydraulic pump according to claim 1, wherein: a first sealing ring (3) is arranged between the servo piston sleeve (5) and the oil distribution cover (1), and the upper side and the lower side of the first sealing ring (3) are provided with check rings (2); and a second sealing ring (4) is arranged between the follow-up piston sleeve (5) and the shell (7).

3. A variable displacement regulating mechanism for a hydraulic pump according to claim 1, wherein: the servo piston sleeve (5) comprises a sleeve body (501), a positioning cylinder body (502) is arranged at the upper end of the sleeve body (501), and the diameter of the positioning cylinder body (502) is smaller than that of the sleeve body (501); a limiting support plate (503) is further arranged between the sleeve body (501) and the positioning cylinder body (502).

4. A variable displacement regulating mechanism for a hydraulic pump according to claim 3, wherein: the oil distribution cover (1) is provided with a positioning hole (9) matched with the positioning cylinder body (502), and the bottom of the positioning hole (9) is provided with an inclined hole communicated with a control oil path of the high-pressure valve of the hydraulic pump.

5. A variable displacement regulating mechanism for a hydraulic pump according to claim 3, wherein: the outer side wall of the sleeve body (501) is further provided with a stepped cylindrical thin-wall structure matched with the inner wall of the shell (7).

6. A variable displacement regulating mechanism for a hydraulic pump according to claim 1, wherein: the follow-up piston sleeve (5) and the follow-up piston (6) are made of structural steel materials.

Technical Field

The invention relates to a variable regulating mechanism, in particular to a variable regulating mechanism for a hydraulic pump.

Background

The variable regulating mechanism determines the realization of the constant-voltage variable performance of the hydraulic pump, so the motion stability and the response speed of the variable mechanism indirectly control the flow rate and the pressure characteristic of the hydraulic pump. Therefore, the reliability of the variable regulating mechanism of the hydraulic plunger pump is improved.

Swash plate axial piston pumps are generally divided into inner and outer support structures. The variable mechanism mainly comprises a return part and a follow-up part, the return part is mainly divided into a single-spring mechanism and a multi-spring mechanism, and the single-spring return mechanism is mainly used for externally supporting the hydraulic pump; the multi-spring mechanism is mainly used for supporting the hydraulic pump. The servo part corresponding to the multi-spring mechanism mainly comprises a servo cavity and a servo piston capable of axially moving in the servo cavity, in most of the existing hydraulic pumps with internal support structures, the servo cavity is formed by opening a hole on a shell, and the servo piston and the servo cavity form a cylindrical friction pair. Because the shell is usually made of aluminum alloy and the servo piston is made of structural steel, when the servo piston pushes the swash plate or the return spring pushes the swash plate to enable the servo piston to enter the servo cavity, the deformation of an inner hole of the shell is easily caused, a friction pair is damaged, and the motion stability of the servo piston in the servo cavity is further influenced. In the existing structure, the follow-up cavity is communicated with a high-pressure oil path on the oil distribution cover of the hydraulic pump on the shell joint surface through the regulating oil path, so that the end face seal must be added on the shell joint surface, and the problem caused by the fact that high-pressure oil from the high-pressure cavity easily washes an annular groove of the end face seal, so that deformation is caused, and oil leakage is caused on the joint surface of the shell and the oil distribution cover. Therefore, the prior art has the problems of poor motion stability of the follow-up piston and easy oil leakage.

Disclosure of Invention

The invention aims to provide a variable regulating mechanism for a hydraulic pump. The servo piston has the characteristics of improving the motion stability of the servo piston and effectively reducing the oil leakage phenomenon.

The technical scheme of the invention is as follows: a variable regulating mechanism for a hydraulic pump comprises a follow-up piston sleeve positioned in a shell, wherein an oil distributing cover is arranged at the upper end of the follow-up piston sleeve, a follow-up piston is sleeved in the follow-up piston sleeve, and a follow-up cavity is arranged between the follow-up piston and an inner hole of the follow-up piston sleeve; the bottom end of the follow-up piston is matched with the swash plate.

In the variable regulating mechanism for the hydraulic pump, a first sealing ring is arranged between the follow-up piston sleeve and the oil distributing cover, and the upper side and the lower side of the first sealing ring are provided with retaining rings; and a second sealing ring is arranged between the follow-up piston sleeve and the shell.

In the variable regulating mechanism for the hydraulic pump, the servo piston sleeve comprises a sleeve body, a positioning cylinder body is arranged at the upper end of the sleeve body, and the diameter of the positioning cylinder body is smaller than that of the sleeve body; and a limiting supporting disk is further arranged between the sleeve body and the positioning cylinder body.

In the variable regulating mechanism for the hydraulic pump, the oil distributing cover is provided with a positioning hole matched with the positioning cylinder, and the bottom of the positioning hole is provided with an inclined hole communicated with a control oil path of a high-pressure valve of the hydraulic pump.

In the variable regulating mechanism for the hydraulic pump, the outer side wall of the sleeve body is further provided with a stepped cylindrical thin-wall structure matched with the inner wall of the casing.

In the variable regulating mechanism for the hydraulic pump, the follower piston sleeve and the follower piston are made of structural steel materials.

Compared with the prior art, the casing and the oil distribution cover are connected into a whole through the follow-up piston sleeve, and the follow-up cavity is formed between the follow-up piston and the inner hole of the follow-up piston sleeve, so that the condition that the inner hole of the casing is easy to deform when the follow-up piston and the inner hole wall of the casing move relatively in the prior art is changed, the movement stability of the follow-up piston is effectively improved, the flow and pressure regulation reliability of the hydraulic plunger pump is improved, and the safety of the hydraulic pump and even a hydraulic system is improved; the hydraulic pump has the advantages that the control oil from the high-pressure valve cavity and the low-pressure return oil from the pump cavity of the oil distribution cover are respectively sealed by two radial seals (the first seal ring and the second seal ring), the condition that the seal groove on the end face of the shell and the seal ring are easily washed and deformed by the high-pressure oil in the existing structure is effectively avoided, the sealing reliability of the hydraulic pump is improved, and the oil leakage phenomenon can be effectively reduced. In addition, one end of the follow-up piston sleeve is assembled in the inner hole of the oil distribution cover, so that the manufacturability of the oil distribution cover assembled in the shell and the vibration resistance of the whole pump are improved. Meanwhile, the control precision and the response speed of variable adjustment of the hydraulic pump can be improved through mutual matching of the structures, so that the reliability of the aviation hydraulic plunger pump in airplane flight is improved. In conclusion, the servo piston has the characteristics of improving the motion stability of the servo piston and effectively reducing the oil leakage phenomenon.

Drawings

FIG. 1 is a structural view of the present invention;

fig. 2 is a partially enlarged view of fig. 1.

The labels in the figures are: 1-oil separation cover, 2-retainer ring, 3-first seal ring, 4-second seal ring, 5-follow-up piston sleeve, 6-follow-up piston, 7-shell, 8-swash plate, 9-positioning hole, 501-sleeve body, 502-positioning cylinder body and 503-limiting support plate.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. A variable regulating mechanism for a hydraulic pump is shown in figures 1-2 and comprises a follow-up piston sleeve 5 positioned in a shell 7, wherein an oil distributing cover 1 is arranged at the upper end of the follow-up piston sleeve 5, a follow-up piston 6 is sleeved in the follow-up piston sleeve 5, and a follow-up cavity is arranged between the follow-up piston 6 and an inner hole of the follow-up piston sleeve 5; the bottom end of the follow-up piston 6 is matched with the swash plate 8.

A first sealing ring 3 is arranged between the servo piston sleeve 5 and the oil distributing cover 1, and the upper side and the lower side of the first sealing ring 3 are provided with retaining rings 2; a second sealing ring 4 is arranged between the follow-up piston sleeve 5 and the shell 7.

The servo piston sleeve 5 comprises a sleeve body 501, a positioning cylinder body 502 is arranged at the upper end of the sleeve body 501, and the diameter of the positioning cylinder body 502 is smaller than that of the sleeve body 501; a limiting support plate 503 is further arranged between the sleeve body 501 and the positioning cylinder 502.

The oil distribution cover 1 is provided with a positioning hole 9 matched with the positioning cylinder 502, and the bottom of the positioning hole 9 is provided with an inclined hole communicated with a control oil path of the high-pressure valve of the hydraulic pump.

The outer side wall of the sleeve body 501 is further provided with a stepped cylindrical thin-wall structure matched with the inner wall of the shell 7, and the installation and the disassembly are convenient.

The follow-up piston sleeve 5 and the follow-up piston 6 are made of structural steel materials.

As shown in fig. 1, in the present invention, the oil separation cover 1 is integrally assembled with the housing 7 by the positioning action of the follower piston sleeve 5. The upper end of the follow-up piston sleeve 5 is provided with a positioning hole of the oil distribution cover, and the bottom of the hole is provided with a control oil path communicated with the high-pressure valve of the hydraulic pump through an inclined hole. The lower end of the follow-up piston sleeve is of a stepped cylindrical thin-wall structure and is matched with an inner hole of the shell. The follow-up piston is arranged in the follow-up piston sleeve, and a cylindrical pair is formed between the follow-up piston and the follow-up piston sleeve. One end of the follow-up piston and an inner hole of a follow-up piston sleeve form a follow-up cavity, and the other end of the follow-up piston is in contact with the swash plate, so that a follow-up part of the variable adjusting mechanism is formed. Because the follow-up piston sleeve and the follow-up piston are made of structural steel materials, the follow-up piston almost has no deformation when reciprocating in the follow-up cavity, and therefore deformation of an inner hole of the hydraulic pump shell is avoided.

The follow-up piston sleeve is provided with a first sealing ring and a second sealing ring which respectively form radial sealing with the inner hole of the shell and the positioning hole of the oil distributing cover. Because the first sealing ring mainly seals the high-pressure oil of the oil distribution cover, two check rings are arranged at the sealing position for protection. The second sealing ring mainly seals the pump cavity for oil return, and because the oil return pressure is generally far lower than 3.5MPa, namely the pressure is not high, a check ring is not needed to be arranged at the position for protection.

As shown in the figure, the positioning cylinder body end of the follow-up piston sleeve is assembled in the positioning hole of the oil distribution cover, so that the oil distribution cover is positioned, and the oil distribution cover is conveniently assembled and connected with the shell. Particularly, through the positioning connection of the follow-up piston sleeve, the connection rigidity of the hydraulic pump shell packaging system can be improved, and therefore the vibration resistance of the hydraulic pump is improved.