A small straight-shaft swash plate type piston pump

Abstract

The utility model provides a kind of small straight axis swash plate type plunger pump, it is related to hydraulic equipment technical field, comprising: pump shell main body, the drive shaft of being penetrated in the pump shell main body, the cylinder body of being sleeved in the drive shaft and the connecting head being connected with the one end of the cylinder body;The pump shell main body has preset accommodation space, the cylinder body is equipped in the accommodation space;The one end of the pump shell main body is connected with pump shell cover by fixed bolt;The one end operating surface of the cylinder body is movably connected with plunger assembly, and the other end operating surface is mutually clamped with distribution disc, and it is compatible with the working size of the pump shell cover;The connecting head side is equipped with oil return door, and the oil return door is communicated with the distribution disc;The utility model is combined design by pump shell main body, drive shaft, cylinder body and connecting head, overall layout is compact, effectively utilizes pump shell main body internal space structure, so that the overall size of pump is smaller, and length is only 90mm, satisfies the application demand of small-sized hydraulic system.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic equipment technology, and in particular to a small straight-shaft swashplate piston pump. Background Technology

[0002] As a core component for high-pressure liquid transportation, the piston pump boasts advantages such as high power density, precise control, and strong load-bearing capacity. In today's rapidly evolving industrial landscape, hydraulic systems, as critical power transmission components in many devices, play a vital role in the overall operation of these systems through their performance and adaptability. Especially with the increasing prevalence of miniaturized equipment, the demand for small piston pumps is gradually growing.

[0003] The large size of traditional piston pumps not only occupies a lot of installation space, but also leads to an unreasonable overall layout of the equipment, affecting its mobility and flexibility, and making it difficult to meet the compact space requirements of small hydraulic systems. Secondly, the internal components of traditional piston pumps are processed using traditional machining methods, which are not only cumbersome, but also require high-level processing equipment and operators, resulting in long processing cycles, high costs, and low manufacturing efficiency. Furthermore, traditional machining cannot guarantee that each component has high precision, and the difference in precision between components can easily lead to performance fluctuations and poor stability of the piston pump during operation. Utility Model Content

[0004] The purpose of this invention is to provide a small straight-shaft swashplate piston pump to solve the technical problems existing in the prior art.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows: A small straight-shaft swashplate piston pump includes: a pump housing body, a drive shaft passing through the pump housing body, a cylinder body sleeved on the drive shaft, and a connector connected to one end of the cylinder body; the pump housing body has a preset receiving space, and the cylinder body is disposed within the receiving space; one end of the pump housing body is connected to a pump housing cover by fixing bolts; one working surface of the cylinder body is movably connected to a piston assembly, and the other working surface is engaged with a distribution plate, which is adapted to the working dimensions of the pump housing cover; a return valve is provided on one side of the connector, and the return valve communicates with the distribution plate.

[0006] Furthermore, a bearing is embedded in the top working surface inside the pump casing body, the bearing is sleeved on the drive shaft, and the end of the drive shaft away from the bearing is rotatably connected to the distribution plate.

[0007] Furthermore, the plunger assembly includes: a swashplate having a preset tilt angle and sleeved on the drive shaft; the working surface at the bottom of the swashplate is provided with multiple slippers, the slippers being movably connected to the plunger, and the plunger being inserted into the cylinder block.

[0008] Furthermore, the distribution plate is provided with a cylinder flow channel, which is adapted to the working surface at the bottom of the cylinder, and a distribution plate flow channel is opened on it; a flow channel is symmetrically opened on the working surface at the bottom of the distribution plate, the flow channel is connected to the distribution plate flow channel, one side of which is threadedly connected to the connector, and a sealing ring is provided at the connection between the flow channel and the connector.

[0009] Furthermore, a return oil port channel is opened on one side of the working surface at the top of the distribution plate. The return oil port channel is connected to the distribution plate channel and is also connected to the return oil valve.

[0010] Furthermore, a positioning pin is provided on the side opposite to the return oil channel of the distribution plate, and the positioning pin is used to limit the position of the distribution plate and the pump casing cover.

[0011] Furthermore, the combined length of the pump housing body, drive shaft, and connector is 90 mm.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This utility model features a compact overall layout through the combined design of the pump housing body, drive shaft, cylinder body, and connector. It effectively utilizes the internal space structure of the pump housing body, resulting in a smaller overall pump size and a length of only 90mm, thus meeting the application requirements of miniaturized hydraulic systems. The cylinder body of this utility model is made by powder metallurgy, which ensures high precision, reduces performance fluctuations caused by differences in precision, and improves the stability of the pump. Furthermore, the processing of each part in this device is relatively convenient, resulting in high manufacturing efficiency and low cost. (III) The swashplate in the plunger assembly of this utility model has a preset tilt angle. When the drive shaft rotates, the tilt angle of the swashplate can effectively convert the rotational motion of the drive shaft into the reciprocating linear motion of the plunger. Multiple slippers set on the working surface at the bottom of the swashplate are movably connected to the plunger, ensuring the smooth movement of the plunger in the cylinder, reducing friction and wear, improving the efficiency and accuracy of the plunger movement, and thus improving the pump's oil suction and discharge capacity. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a front view of the internal structure of this utility model; Figure 4This is a perspective view of the internal structure of this utility model; Figure 5 This is a partial schematic diagram of the internal structure of this utility model; Figure 6 This is a perspective view of the distribution plate of this utility model; Figure 7 This is a schematic diagram of the connection between the slipper and the plunger of this utility model.

[0014] In the diagram: 1. Pump housing body; 2. Drive shaft; 3. Cylinder block; 4. Sealing ring; 5. Swashplate; 6. Bearing; 7. Slipper; 8. Piston; 9. Distributor plate; 10. Pump housing cover; 11. Connector; 12. Return valve; 13. Flow channel; 14. Positioning pin; 15. Return port flow channel; 16. Cylinder block flow channel; 17. Distributor plate flow channel; 18. Fixing bolt. Detailed Implementation

[0015] To make the content of this utility model easier to understand, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0016] like Figure 1-2As shown, this embodiment provides a small straight-shaft swashplate piston pump, including: a pump housing body 1, a drive shaft 2 passing through the pump housing body 1, a cylinder 3 sleeved on the drive shaft 2, and a connector 11 connected to one end of the cylinder 3; the pump housing body 1 has a preset receiving space, and the cylinder 3 is disposed in the receiving space, and the pump housing body 1 provides stable operating conditions for the cylinder 3; one end of the pump housing body 1 is connected to the pump housing cover 10 by a fixing bolt 18, and the above connection method ensures the stability of the overall structure of the device, and also makes the inside of the pump housing body 1 form a closed and stable working environment; the drive shaft 2 It is connected to an external brushless motor, thereby driving the cylinder body 3 and the components connected to the cylinder body 3 to rotate, pushing the plunger 8 to perform reciprocating linear motion within the cylinder body 3; the cylinder body 3 provides movement space for the plunger 8, and the plunger hole on the cylinder body 3 and the plunger 8 cooperate to form a sealed working chamber, and hydraulic pressure is transmitted through the internal oil passage; furthermore, a bearing 6 is embedded in the top working surface inside the pump housing body 1, and the bearing 6 is sleeved on the drive shaft 2. The bearing 6 provides stable support for the high-speed rotation of the drive shaft 2, and has low friction, which can effectively reduce the vibration and offset of the drive shaft 2 during rotation, ensuring efficient power transmission; The drive shaft 2, at the end furthest from the bearing 6, is rotatably connected to the distribution plate 9; one working surface of the cylinder body 3 is movably connected to the plunger assembly, and the other working surface engages with the distribution plate 9, which is adapted to the working dimensions of the pump housing cover 10. The distribution plate 9 is made of high-strength aluminum alloy or alloy steel and has high precision; under the drive of the plunger assembly, the cylinder body 3 can precisely cooperate with the distribution plate 9 to smoothly realize the process of hydraulic oil intake and discharge; a return oil valve 12 is provided on one side of the connector 11, and the return oil valve 12 is connected to the distribution plate 9 to form the oil circuit circulation of the entire hydraulic system; the pump housing body 1, drive shaft 2. The length of the connector 11 is 90mm. Through its compact structural design, it can be adapted to equipment equipped with a miniaturized hydraulic system. It should be noted that the cylinder body 3 is made using powder metallurgy. According to the usage requirements of the cylinder body 3, a suitable metal powder, such as iron-based powder or copper-based powder, is selected. Then, an appropriate amount of additives are added and the mixture is placed in a mold and pressed under a preset pressure. After processing, the dimensional accuracy and surface quality of the cylinder body 3 are ensured. During assembly, the cylinder body 3 is installed inside the pump housing body 1, so that it fits tightly against the distribution plate 9. The positioning pin 14 is used for positioning to ensure the accurate relative position between the cylinder body 3 and the distribution plate 9.

[0017] like Figure 3-4As shown, the plunger assembly includes: a swashplate 5, which has a preset tilt angle and is sleeved on the drive shaft 2, enabling efficient and precise conversion of the rotational motion of the drive shaft 2 into the reciprocating linear motion of the plunger 8, providing power support for the oil suction and discharge process of this device; the working surface at the bottom of the swashplate 5 is provided with multiple slippers 7, which are movably connected to the plunger 8, and the plunger 8 is inserted into the cylinder 3, with the head of the plunger 8 forming a sealed chamber with the bore wall of the cylinder 3; driven by the slippers 7 and the swashplate 5, the plunger 8 performs reciprocating linear motion within the cylinder 3, causing periodic changes in the volume within the cylinder 3 through the reciprocating linear motion, thereby realizing the suction and discharge of hydraulic oil and ensuring that this device can stably and reliably complete the hydraulic pressure task.

[0018] like Figure 5-7 As shown, the distribution plate 9 is provided with a cylinder flow channel 16, which is adapted to the bottom working surface of the cylinder 3. The cylinder flow channel 16 provides a channel for oil exchange between the cylinder 3 and the distribution plate 9 during operation. A distribution plate flow channel 17 is opened on the cylinder flow channel 16, which is used to guide the flow direction and path of the oil in the distribution plate 9. A flow channel 13 is symmetrically opened on the bottom working surface of the distribution plate 9. The flow channel 13 is a suction / discharge channel. The flow channel 13 is connected to the distribution plate flow channel 17, so that the oil can be diverted from the distribution plate flow channel 17 to the flow channel 13. One side of the flow channel 13 is threadedly connected to the connector 11. A sealing ring 4 is provided at the connection between the flow channel 13 and the connector 11, which effectively ensures the transmission of oil between different components and ensures the oil flow. The system's sealing performance and operating efficiency are improved. A return oil channel 15 is opened on one side of the working surface at the top of the distribution plate 9. The return oil channel 15 is connected to the distribution plate channel 17 and the return oil valve 12, perfecting the oil circulation path of the entire hydraulic system. This allows excess oil or oil requiring return during operation to return smoothly, helping to maintain pressure balance within the system and improving its stability and reliability. A positioning pin 14 is provided on the opposite side of the distribution plate 9 and the return oil channel 15. The positioning pin 14 is used to limit the positioning of the distribution plate 9 and the pump housing cover 10, ensuring accurate relative positioning between the distribution plate 9 and other components. This guarantees that the oil flow between the various channels follows a preset path and method, further enhancing the stability and reliability of the entire small straight-shaft swashplate piston pump.

[0019] Working principle: During the oil suction process, when the drive shaft 2 drives the plunger 8 and cylinder 3 to rotate via an external brushless motor, the plunger 8 moves outward under the action of the plunger return spring, increasing the volume of the sealed chamber formed by the plunger 8 and cylinder 3 and reducing the pressure inside the chamber. At this time, the cylinder flow channel 16 is connected to the flow channel 13 of the distribution plate 9, and the external oil enters the sealed chamber through the flow channel 13, the distribution plate 9 and the cylinder flow channel 16 under atmospheric pressure, completing the oil suction process.

[0020] During the oil discharge process, as the drive shaft 2 continues to rotate, the plunger 8 moves inward under the push of the swashplate 5, the volume of the sealed chamber decreases, and the oil pressure inside the chamber increases. At this time, under the action of rotation, the cylinder flow channel 16 and the flow channel 13 of the distribution plate 9 are connected, and the oil is discharged to the external hydraulic system through the cylinder flow channel 16 and the flow channel 13 of the distribution plate 9, thus completing the oil discharge process.

[0021] In continuous operation, the drive shaft 2 rotates continuously, and the plunger 8 reciprocates continuously. The oil suction and discharge processes alternate periodically, thereby realizing the continuous delivery of the hydraulic system. By changing the rotation direction of the drive shaft 2, the oil inlet and outlet of the flow channel 13 can be switched to meet the working requirements of different hydraulic systems.

[0022] The above description is only a preferred embodiment of this utility model patent and is not intended to limit this utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model patent should be included within the protection scope of this utility model patent.

Claims

1. A small size direct axis swash plate type piston pump characterized by: include: Pump housing body (1), drive shaft (2) passing through the pump housing body (1), cylinder (3) sleeved on the drive shaft (2) and connector (11) connected to one end of the cylinder (3). The pump housing body (1) has a preset receiving space, and the cylinder (3) is provided in the receiving space; one end of the pump housing body (1) is connected to the pump housing cover (10) by a fixing bolt (18); One end of the cylinder (3) is movably connected to the plunger assembly, and the other end of the cylinder is engaged with the distribution plate (9), which is compatible with the working dimensions of the pump housing cover (10). The connector (11) has a return valve (12) on one side, and the return valve (12) is connected to the distribution plate (9).

2. The small straight-shaft swashplate piston pump according to claim 1, characterized in that: The pump housing body (1) has a bearing (6) embedded in the top working surface inside. The bearing (6) is sleeved on the drive shaft (2). The end of the drive shaft (2) away from the bearing (6) is rotatably connected to the distribution plate (9).

3. The small size direct axis swash plate type piston pump according to claim 1, characterized by: The plunger assembly includes: a swashplate (5), which has a preset tilt angle and is sleeved on the drive shaft (2); the working surface at the bottom of the swashplate (5) is provided with multiple slippers (7), which are movably connected to the plunger (8), and the plunger (8) is inserted into the cylinder (3).

4. The small size direct axis swash plate type piston pump according to claim 3, characterized by: The distribution plate (9) is provided with a cylinder flow channel (16), which is adapted to the working surface at the bottom of the cylinder (3), and a distribution plate flow channel (17) is opened on it; a flow channel (13) is symmetrically opened on the working surface at the bottom of the distribution plate (9), the flow channel (13) is connected to the distribution plate flow channel (17), and one side of it is threadedly connected to the connector (11). A sealing ring (4) is provided at the connection between the flow channel (13) and the connector (11).

5. The small size direct axis swash plate type piston pump according to claim 4, characterized by: The top working surface of the distribution plate (9) has an oil return port channel (15) which is connected to the distribution plate channel (17) and to the oil return valve (12).

6. The small size direct axis swash plate type piston pump according to claim 5, characterized by: The distribution plate (9) is provided with a positioning pin (14) on the side opposite to the return oil channel (15). The positioning pin (14) is used to limit the distribution plate (9) and the pump casing cover (10).

7. The small straight-shaft swashplate piston pump according to claim 1, characterized in that: The total length of the pump housing body (1), drive shaft (2), and connector (11) is 90 mm.

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