阅读说明：本技术 改良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。与传统技术相比,通过在柱塞行程不变的前提下减短柱塞的长度,降低缸体孔外的高度,减小往复运动时产生的侧向力矩,同时相应缩短弹簧总长度,降低弹簧在伸缩运动时产生的弯曲,避免和柱塞孔内过大磨擦造成的磨损,使通油通道横截面扩大2倍。(Axial plunger pump of improvement 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 length of the plunger is shortened on the premise that the stroke of the plunger is not changed, the height outside the cylinder hole is reduced, the lateral moment generated during reciprocating motion is reduced, meanwhile, the total length of the spring is correspondingly shortened, the bending of the spring generated during telescopic motion is reduced, the abrasion caused by excessive friction in the plunger hole is avoided, and the cross section of the oil passage is enlarged by 2 times.)

1. Axial plunger pump of improvement 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: the plunger (610), a plunger hole (620), a plunger hole bottom ball pit (630), a guide rod ball pit (640), a steel ball (650), a guide rod (660), a spring (670) and a spring seat (680), wherein the length of the plunger (610) is 25-27 mm, the plunger hole (620) is arranged in the plunger (610), the plunger hole bottom ball pit (630) is arranged at the inner bottom of the plunger hole (620), the radius of the plunger hole bottom ball pit (630) is greater than that of the steel ball (650) by 0.2-0.5 mm, the guide rod ball pit (640) is arranged at the front end of the guide rod (660), the steel ball (650) is slidably clamped and connected with the middles of the plunger hole bottom ball pit (630) and the guide rod ball pit (640), the radius of the plunger hole bottom ball pit (630) is greater than that of the guide rod ball pit (640), the radius of the guide rod ball pit (640) is the same as that of the steel ball (650), and the guide rod (660) is connected with the spring (670), the length of the spring (670) is 34-37 mm, the spring (670) is connected with a spring seat (680), and the spring seat (680) is connected with the bottom of the hole of the cylinder body (500).

2. The axial piston pump of the improved piston structure 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 axial piston pump of the improved piston structure as claimed in claim 1, wherein: the swash plate structure (800) comprises: the novel plunger type swash plate assembly comprises a swash plate (810), a thrust bearing (820), rolling steel balls (830), a non-metal steel ball retainer (840) and a rotary plate (850), wherein the thrust bearing (820) is connected with the upper portion of the swash plate (810), the rolling steel balls (830) are connected with the thrust bearing (820) through the non-metal steel ball retainer (840), one side of the rotary plate (850) is connected with the thrust bearing (820), the other side of the rotary plate (850) is connected with a plunger assembly (600), the set angle of the oblique angle of the swash plate (810) is 7-13 degrees, and the set angle of the oblique angle of the rotary plate (850) is 7-13 degrees.

4. The axial piston pump of the improved piston structure as claimed in claim 1, wherein: the cylinder body (500) is provided with oil through holes (510), the number of the oil through holes (510) is 7 or 9, and the diameter of each oil through hole (510) is 7.5-9.5 mm.

5. The axial piston pump of the improved piston structure as claimed in claim 1, wherein: the radius of the spherical surface (690) at the outer top end of the plunger (610) is 7-13 mm.

6. The axial piston pump of the improved piston structure as claimed in claim 1, wherein: and an O-shaped sealing ring (310) is arranged at the connection end of the pump shell (300) and the end cover (1000).

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, an electro-hydraulic switch machine which runs in a railway track switch system adopts an axial plunger pump, the majority of the axial plunger pump is reformed from the original low-flow MCY14-1B, 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 piston is designed to be hollow, the steel ball is clamped in ball pits at the bottoms of the spring guide rod and the plunger piston hole in a sliding manner, the return spring is sleeved on the spring guide rod, the other end of the return spring is connected with the spring seat, and the spring seat is fixed at the bottom of the copper cylinder body hole. The swash plate assembly is fixed in a rear cover of the oil pump, and a thrust bearing is arranged on the swash plate. And the hemisphere surface at the top of the plunger is connected with a pad disc on the swash plate assembly, and the rear cover is connected with the pump casing to complete the assembly of the whole pump. The cylinder body is driven to operate by the transmission shaft, the plunger changes the volume in the plunger hole to suck and discharge liquid by reciprocating motion due to the angle of the swash plate, the transmission shaft of the axial plunger pump series not only transmits torque, but also bears bending moment generated by the plunger laterally inwards, because of the existing design, the maximum length of the plunger assembly extending out of the cylinder body is 15mm, the length remained in the cylinder is less than 15mm, the moment of lateral component force generated when the plunger slides along the swash plate is larger, so that the cylinder body has a side-turning trend, the oil distribution sealing surface is easy to leak and difficult to maintain a sealing state, and therefore, the oil distribution disc and the cylinder body, two pairs of friction pairs of the oil distribution disc and the plane of the pump body are difficult to reach an optimal state, the performance of the oil pump is difficult to reach technical indexes, the lateral bending moment generated when the plunger reciprocates, the abrasion of the cylinder body hole, the return spring in the hole also stretches, and the longer spring moves in the hole to inevitably generate bending and friction on the wall of the plunger hole, so that the abrasion of the spring is accelerated.

With the continuous development and growth of high-speed rail in China, the original technical indexes are not suitable for the change of the era, and the requirement on the service life of the switch oil pump is greatly improved.

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 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 assembly comprises: plunger, plunger hole bottom ball nest hole, guide arm ball nest hole, steel ball, guide arm, spring and spring holder, plunger length is 25mm ~ 27mm, inside the plunger was located to the plunger hole, plunger hole bottom ball nest hole locates the plunger downthehole bottom, plunger hole bottom ball nest hole radius is greater than steel ball radius 0.2mm ~ 0.5mm, on the guide arm front end was located to the guide arm ball nest hole, the steel ball is connected with slip centre gripping in the middle of plunger hole bottom ball nest hole and the guide arm ball socket hole, plunger hole bottom ball nest hole radius is greater than guide arm ball socket hole radius, guide arm ball socket hole radius is the same with the steel ball radius, guide arm and spring coupling, spring length is 34mm ~ 37mm, spring and spring holder connection, the spring holder is connected with the downthehole bottom of cylinder body.

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 tilting tray comprises a tilting tray body, a thrust bearing, rolling steel balls, a non-metallic steel ball retainer and a rotating disc, wherein the thrust bearing is connected with the upper portion of the tilting tray body, the rolling steel balls are connected with the thrust bearing through the non-metallic steel ball retainer, one side of the rotating disc is connected with the thrust bearing, the other side of the rotating disc is connected with a plunger assembly, the setting angle of the tilting tray body is 7-13 degrees, and the setting angle of the tilting angle of the rotating disc body is.

Furthermore, the cylinder body is provided with oil through holes, the number of the oil through holes is 7 or 9, and the diameter of each oil through hole is 7.5 mm-9.5 mm.

Furthermore, the radius of the spherical surface at the top end of the outer part of the plunger is 7 mm-13 mm.

Furthermore, an O-shaped sealing ring is arranged at the joint end of the pump shell and the end cover.

The invention has the beneficial effects that:

compared with the prior art, the length of the plunger is shortened on the premise that the stroke of the plunger is not changed, the height outside a cylinder hole is reduced, the lateral moment generated during reciprocating motion is reduced, the total length of the spring is correspondingly shortened, the bending of the spring generated during telescopic motion is reduced, the abrasion caused by excessive friction in the plunger hole is avoided, and the cross section of an oil passage can be enlarged by 2 times. The oil through hole is improved to be 7 holes or 9 holes, and the oil through hole has the effects that the oil absorption peak value and the oil discharge peak value are effectively staggered, the flow pulsation is small, the pressure is stable, and the resonance is avoided, and the three indexes are the key for the success or failure of the oil pump.

Description of the drawings:

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

Fig. 2 is a schematic structural view of the plunger assembly of the present invention.

FIG. 3 is a schematic structural view of the cylinder bore bottom oil passage of the present invention.

Fig. 4 is a schematic structural view of the swash plate structure of the present invention.

Reference numerals:

pump body 100, oil distribution pan 200, pump casing 300 and O-ring seal 310.

Needle bearing 400, cylinder block 500, and oil through hole 510.

Plunger assembly 600, plunger 610, plunger bore 620, opening 621, plunger bore bottom ball socket 630, guide rod ball socket 640, steel ball 650, guide rod 660, spring 670, spring seat 680, and top ball 690.

The device comprises a transmission shaft 700, a swash plate structure 800, a swash plate 810, a thrust bearing 820, rolling steel balls 830, a non-metal steel ball retainer 840 and a turntable 850.

Bearing 900 and 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.