阅读说明：本技术 改良式柱塞结构的轴向柱塞泵 (Axial plunger pump with improved plunger structure ) 是由 朱建平 于 2019-12-10 设计创作，主要内容包括：改良式柱塞结构的轴向柱塞泵,包括：泵体、配油盘、泵壳、滚针轴承、缸体、柱塞组件、传动轴、斜盘结构、轴承和端盖,泵体通过螺钉与泵壳连接,配油盘设于泵体和泵壳中间,缸体通过滚针轴承与泵壳内部支撑连接,柱塞组件与缸体内孔连接,柱塞组件前端与斜盘结构压紧连接,传动轴与泵体内固定连接,传动轴与泵体、配油盘和缸体贯穿连接,斜盘结构与端盖连接,轴承与传动轴连接,端盖通过螺钉与泵壳连接。本发明与传统技术相比,通过取消内部零件,改善了柱塞在往复行程中的自转状态,磨损更小,提高了油泵的寿命。采用了双弹簧组件的结构,减少孔壁对弹簧的磨损。对柱塞孔壁,进行改造,有效避开了对弹簧的刮擦。从而大大提高了弹簧的使用寿命。(Axial plunger pump of improvement formula plunger structure includes: the pump body, join in marriage the food tray, the pump case, needle bearing, the cylinder body, the plunger subassembly, the transmission shaft, the sloping cam plate structure, bearing and end cover, the pump body passes through the screw and is connected with the pump case, join in marriage the food tray and locate in the middle of the pump body and the pump case, the cylinder body passes through needle bearing and is connected with the inside support of pump case, the plunger subassembly is connected with the cylinder body hole, the plunger subassembly front end compresses tightly with the sloping cam plate structure and is connected, transmission shaft and pump body internal fixation are connected, the transmission shaft and the pump body, join in marriage food tray and cylinder body through connection, the sloping. Compared with the prior art, the invention improves the autorotation state of the plunger in the reciprocating stroke by eliminating internal parts, has smaller wear and prolongs the service life of the oil pump. The structure of the double-spring assembly is adopted, so that the abrasion of the hole wall to the spring is reduced. The plunger hole wall is improved, and the scraping of the spring is effectively avoided. Thereby greatly prolonging the service life of the spring.)

1. Axial plunger pump of improvement formula plunger structure, its characterized in that includes: the oil distribution pump comprises a pump body (100), an oil distribution disc (200), a pump shell (300), a needle bearing (400), a cylinder body (500), a plunger assembly (600), a transmission shaft (700), a swash plate structure (800), a bearing (900) and an end cover (1000), wherein the pump body (100) is connected with the pump shell (300) through screws, the oil distribution disc (200) is arranged between the pump body (100) and the pump shell (300), the cylinder body (500) is in supporting connection with the inside of the pump shell (300) through the needle bearing (400), the plunger assembly (600) is connected with an inner hole of the cylinder body (500), the front end of the plunger assembly (600) is in compression connection with the swash plate structure (800), the transmission shaft (700) is fixedly connected with the inside of the pump body (100), the transmission shaft (700) is in penetrating connection with the pump body (100), the oil distribution disc (200) and the cylinder body (500), the swash plate structure (800) is connected with the end cover (, the end cover (1000) is connected with the pump shell (300) through screws;

wherein the plunger assembly (600) comprises: a plunger (610), a plunger hole (620), a first spring (630), a first guide rod (640), a steel ball (650), a second guide rod (660), a second spring (670), a spring seat (680) and a plunger ball (690), the plunger hole (620) is arranged in the plunger (610), one end of the first spring (630) is connected with the top end of the inner wall of the plunger hole (620), one end of the first guide bar (640) is connected with the other end of the first spring (630), the steel ball (650) is arranged between the first guide rod (640) and the second guide rod (660), the second guide rod (660) is connected with a second spring (670), the second spring (670) is connected with a spring seat (680), the spring seat (680) is connected with the bottom in the hole of the cylinder body (500), the plunger ball (690) is arranged at the top end of the plunger (610), and the radius of the plunger ball (690) is 7-13 mm.

2. The improved plunger structure of axial plunger pump as claimed in claim 1, wherein: the roughness of plunger hole (620) interior passageway is Ra0.4 ~ 0.8, the end of plunger hole (620) is equipped with opening (621), opening (621) are tubaeform structure, the chamfer outer orifice of opening (621) is 0.4mm ~ 0.5mm with the outer wall distance, the chamfer angle of opening (621) is 15 ~ 40.

3. The improved plunger structure of axial plunger pump as claimed in claim 1, wherein: the swash plate structure (800) comprises: the hydraulic oil pump comprises a swash plate (810), a thrust bearing (820) and a rotary plate (830), wherein the thrust bearing (820) is connected with the upper part of the swash plate (810), one side of the rotary plate (830) is connected with the thrust bearing (820), and the other side of the rotary plate (830) is connected with a plunger assembly (600).

Technical Field

The invention relates to the technical field of plunger structures and plunger pumps, in particular to an axial plunger pump with an improved plunger structure.

Background

At present, the electro-hydraulic switch machine operating in a railway track switch system adopts an axial plunger pump, the majority of which is reformed by the original small flow MCY 14-1B, a transmission shaft of the oil pump penetrates through a bearing fixed in a pump body, an oil distribution disc, a copper cylinder body internal spline, a pump shell and a needle bearing fixed on the inner wall to connect the pump body, and the copper cylinder body is supported by the needle bearing to form an assembly: the plunger component is arranged in the hole of the cylinder body, and the swash plate component is fixed in the back cover of the oil pump, and the back cover is connected with the pump shell to complete the assembly of the whole oil pump. The oil pump drives the cylinder body to rotate through the transmission shaft, and the plunger reciprocates due to the angle of the swash plate, so that the volume in the cylinder is changed to suck and discharge liquid.

At present, the reciprocating work of the plunger in the axial plunger pump adopts a central spring structure. The central spring structure is propped against the return disc, and the return disc supports the sliding ring to enable the sliding ring to pull the plunger to realize the purpose. The sliding ring is easy to wear and drop off in the operation process, so that the oil pump is very easy to scrap, and the hydraulic system stops running.

In order to solve the above problems, we have made a series of improvements.

Disclosure of Invention

It is an object of the present invention to provide an axial piston pump with an improved piston structure, which overcomes the above-mentioned disadvantages and drawbacks of the prior art.

Axial plunger pump of improvement formula plunger structure includes: the oil distribution pump comprises a pump body, an oil distribution disc, a pump shell, a needle bearing, a cylinder body, a plunger assembly, a transmission shaft, an inclined disc structure, a bearing and an end cover, wherein the pump body is connected with the pump shell through a screw;

wherein, the plunger subassembly includes: the plunger, the plunger hole, first spring, first guide arm, the steel ball, the second guide arm, the second spring, spring holder and plunger ball, inside the plunger was located to the plunger hole, the one end and the downthehole wall top of plunger hole of first spring are connected, the one end of first guide arm is connected with the other end of first spring, the steel ball is located between first guide arm and the second guide arm, second guide arm and second spring coupling, the second spring is connected with the spring holder, the spring holder is connected with the downthehole bottom of cylinder body, the plunger top is located to the plunger ball, plunger ball radius is 7mm ~ 13 mm.

Further, the roughness of the passageway in the plunger hole is Ra0.4 ~ 0.8, the end in plunger hole is equipped with the opening, the opening is tubaeform structure, open-ended chamfer outer orifice and outer wall distance are 0.4mm ~ 0.5mm, open-ended chamfer angle is 15 ~ 40.

Further, the swash plate structure includes: the plunger piston type hydraulic pump comprises a swash plate, a thrust bearing and a rotary plate, wherein the thrust bearing is connected with the upper portion of the swash plate, one side of the rotary plate is connected with the thrust bearing, and the other side of the rotary plate is connected with a plunger assembly.

The invention has the beneficial effects that:

compared with the prior art, the invention improves the autorotation state of the plunger in the reciprocating stroke by eliminating internal parts, has smaller wear and prolongs the service life of the oil pump. The structure of the double-spring assembly is adopted, so that the abrasion of the hole wall to the spring is reduced. The plunger hole wall is improved, and the scraping of the spring is effectively avoided. Thereby greatly prolonging the service life of the spring.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the swash plate structure of the present invention.

Fig. 3 is a schematic structural view of the plunger assembly of the present invention.

Reference numerals:

pump body 100, oil distribution pan 200, pump housing 300, needle roller bearing 400, and cylinder block 500.

Plunger assembly 600, plunger 610, plunger bore 620, and opening 621.

A first spring 630, a first guide bar 640, a steel ball 650, a second guide bar 660, a second spring 670, a spring seat 680, and a plunger ball 690.

A drive shaft 700, a swash plate structure 800, a swash plate 810, a thrust bearing 820, and a turntable 830, a bearing 900, and an end cap 1000.

Detailed Description

The present invention will be further described with reference to the following examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.

FIG. 1 is a schematic structural diagram of the present invention. Fig. 2 is a schematic structural view of the swash plate structure of the present invention. Fig. 3 is a schematic structural view of the plunger assembly of the present invention.