Plunger type hydraulic element with cooling structure

Abstract

The utility model relates to the field of hydraulic technology more specifically, relate to a kind of plunger type hydraulic components with cooling structure, including shell, swash plate and by swash plate drive multiple oil suction and discharge units, at least one oil suction and discharge unit is split type oil suction and discharge unit, shell is provided with mobile plunger mounting hole, fixed plunger is fixedly arranged on shell and one end extends into mobile plunger mounting hole, mobile plunger sleeve slidingly arranged in mobile plunger mounting hole and clearance fit, the cavity formed by mobile plunger mounting hole inner wall, mobile plunger sleeve bottom wall, fixed plunger outer cylindrical surface is provided with oil port with shell inner cavity communication, sliding shoe is located in shell inner cavity and with the end surface of swash plate contact;The utility model mobile plunger sleeve and mobile plunger mounting hole slidingly connect, mobile plunger sleeve is guided by mobile plunger mounting hole, prevent the lateral force that sliding shoe and mobile plunger sleeve are subjected from acting on fixed plunger completely, cause fixed plunger damage.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and more specifically, to a plunger-type hydraulic component with a cooling structure. Background Technology

[0002] Chinese utility model patent application number 202410448627.7 discloses a digital displacement piston-type hydraulic component and its circuit. Specifically, it discloses that the digital pump uses multiple pistons arranged in groups of three equally spaced pistons, with a total of 5 to 7 groups. Different displacements are achieved by using different numbers of piston groups. When one group of pistons is working, the swashplate experiences a large axial force, which is applied to the bearings on both sides of the main shaft. Because this axial force is very large at the rated working pressure of the hydraulic pump, it seriously affects the bearing life. The diameter of the piston distribution circle in this digital displacement pump is larger than that in existing swashplate-type axial piston pumps. Therefore, at the rated speed, the friction [PV] value of the slipper is greater than the corresponding value in traditional hydraulic pumps, resulting in more severe lubrication friction and wear of the slipper, which also significantly impacts the lifespan of the piston pump. In this digital displacement pump, the movable plunger sleeve of the split plunger only contacts the fixed plunger. Since the fixed plunger is a cantilever beam structure with a small diameter, it is difficult to withstand the radial force of the movable plunger sleeve, which can easily damage the fixed plunger.

[0003] Therefore, it is necessary to improve the existing technologies related to digital pumps. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a plunger-type hydraulic component with a cooling structure is provided, which improves the stress on the bearings on both sides of the spindle and increases the service life of the fixed plunger.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A plunger-type hydraulic component with a cooling structure includes a housing, a swashplate, a ball cup, a return plate, and multiple suction and discharge units driven by the swashplate. At least one suction and discharge unit is a split-type unit, comprising a slipper, a movable plunger sleeve, and a fixed plunger. The slipper and the movable plunger sleeve are connected by a ball joint. The movable plunger sleeve is fitted over the fixed plunger and slidably connected to it, with a clearance fit between them. The ball cup is connected to the return plate via a spherical surface, and the return plate presses the slipper against the end face of the swashplate. The housing has a movable plunger mounting hole. The fixed plunger is fixedly mounted on the housing, with one end extending into the movable plunger mounting hole. The movable plunger sleeve is slidably mounted in the movable plunger mounting hole and has a clearance fit with it. A cavity formed by the inner wall of the movable plunger mounting hole, the bottom wall of the movable plunger sleeve, and the outer surface of the fixed plunger has an oil port communicating with the inner cavity of the housing.

[0007] A left thrust bearing and a right thrust bearing are respectively provided on the left and right sides of the inner cavity of the housing, and the left and right sides of the swashplate are in contact with the left thrust bearing and the right thrust bearing respectively.

[0008] Preferably, the swash plate has an annular cavity inside, and the outer annular surface of the swash plate has a plurality of through holes communicating with the annular cavity. The oil suction side of the end face of the swash plate has an oil suction waist-shaped groove communicating with the annular cavity.

[0009] The swashplate is provided with positioning shoulders on both sides to cooperate with the left thrust bearing or the right thrust bearing.

[0010] Preferably, an annular groove is provided in the middle of the housing, and the annular groove cooperates with the outer ring surface of the swashplate, the left thrust bearing, and the right thrust bearing to form an annular cavity;

[0011] The annular chamber is connected to the chamber where the swashplate end face is located through the gap between the adjacent rolling elements of the left and right thrust bearings.

[0012] Preferably, the housing is provided with fixed plunger mounting holes on both sides, one end of the fixed plunger is fixedly installed in the fixed plunger mounting hole, the fixed plunger is provided with an internal pipeline communicating with the inner cavity of the movable plunger sleeve, the fixed plunger is respectively connected to an oil suction control valve and a check valve, the A port of the oil suction control valve and the check valve are respectively connected to the internal pipeline of the fixed plunger, the B port of the oil suction control valve is connected to the low pressure port on the housing or the inner cavity of the housing, and the B port of the check valve is connected to the high pressure port on the housing;

[0013] The A port and B port of the check valve are the inlet and outlet, respectively.

[0014] Preferably, cover plates are fixedly provided on both sides of the housing, and a retaining block is provided between the fixed plunger and the cover plate.

[0015] Preferably, the clearance between the movable plunger sleeve and the fixed plunger is 10-40µm, and the clearance between the movable plunger sleeve and the movable plunger mounting hole is 10-40µm.

[0016] Preferably, the plunger diameter of the oil suction and discharge unit is set to three types, and the working areas of the plunger of the oil suction and discharge unit with the three plunger diameters are 1A, 2A, and 4A, respectively, where A is the plunger cross-sectional area of ​​the oil suction and discharge unit with the smallest plunger diameter, and the number of the three types of oil suction and discharge units with plunger working areas of 1A, 2A, and 4A are 3, 3, and 12 respectively.

[0017] The oil suction and discharge units with a plunger working area of ​​1A and 2A adopt the split-type oil suction and discharge unit, while the oil suction and discharge unit with a plunger working area of ​​4A adopts the integrated oil suction and discharge unit.

[0018] Preferably, the oil suction control valve is an electromagnetic switch valve.

[0019] The advantages of this utility model compared with the prior art are as follows:

[0020] 1. This utility model, by setting a thrust bearing between the swashplate and the housing, can transmit the axial force on the swashplate to the housing through the thrust bearing, thereby reducing the force acting on the bearings on both sides of the main shaft and improving the service life of the bearings.

[0021] 2. The movable plunger sleeve of this utility model is slidably connected to the movable plunger mounting hole. The movable plunger sleeve is guided by the movable plunger mounting hole to prevent the lateral force on the slip shoe and the movable plunger sleeve from acting entirely on the fixed plunger and causing damage to the fixed plunger.

[0022] 3. This utility model is equipped with cooling oil circuits at the moving plunger mounting hole and swashplate position, which can cool the suction and discharge unit and swashplate through the hydraulic oil in the inner cavity of the housing. The hydraulic oil in the annular chamber enters the inner cavities on the left and right sides of the housing through the gaps between the rolling elements of the bearing, and then enters the plunger cavity through the oil suction groove on the swashplate, thereby cooling the thrust bearing. Attached Figure Description

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0025] Figure 2 for Figure 1 A magnified view of part A in the image;

[0026] Figure 3 This is a schematic diagram of the swashplate structure;

[0027] Figure 4 This is a schematic diagram showing the connection between the check valve and the oil suction / discharge unit.

[0028] Figure 5 This is a schematic diagram of the overall principle of this utility model.

[0029] In the diagram: 1-Housing, 1.1-Moving plunger mounting hole, 1.2-Left thrust bearing, 1.3-Right thrust bearing, 1.4-Fixed plunger mounting hole, 2-Swashplate, 2.1-Annular cavity, 2.2-Through hole, 2.3-Oil suction groove, 2.4-Positioning shoulder, 3-Separated oil suction and discharge unit, 3.1-Slipper, 3.2-Moving plunger sleeve, 3.3-Fixed plunger, 4-Oil suction control valve, 5-Check valve, 6-Cover plate, 7-Spherical cup, 8-Return plate, 9-Oil port, 10-Annular cavity, 11-Integrated oil suction and discharge unit. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example:

[0032] like Figures 1 to 4 As shown, a plunger-type hydraulic component with a cooling structure includes a housing 1, a swashplate 2, a ball cup 7, a return plate 8, and multiple suction and discharge units driven by the swashplate 2, wherein at least one suction and discharge unit is a split-type suction and discharge unit 3. Preferably, the plunger diameter of the suction and discharge units is set to three different sizes, and the working areas of the plungers of the three plunger diameters are 1A, 2A, and 4A, respectively. The suction and discharge units with working areas of 1A and 2A adopt the aforementioned split-type suction and discharge unit 3, while the suction and discharge unit with a working area of ​​4A adopts an integrated suction and discharge unit. The integrated suction and discharge unit adopts the integrated suction and discharge unit disclosed in the background art documents.

[0033] The split-type oil suction and discharge unit 3 includes a sliding shoe 3.1, a movable plunger sleeve 3.2, and a fixed plunger 3.3. The sliding shoe 3.1 and the movable plunger sleeve 3.2 are connected by a ball joint. Internal oil passages are provided inside the sliding shoe 3.1 and the movable plunger sleeve 3.2, connecting the inner cavity of the movable plunger sleeve 3.2 to the sliding shoe surface of the sliding shoe 3.1. The sliding shoe 3.1 is located inside the housing 1. A ball cup 7 is connected to a return plate 8 via a spherical surface. The return plate 8 presses the sliding shoe 3.1 against the end face of the swashplate 2. The movable plunger sleeve 3.2 is slidably fitted around the fixed plunger 3.3 with a clearance fit. The swashplate 2 drives the sliding shoe 3.1 and the movable plunger sleeve 3.2 to reciprocate relative to the fixed plunger 3.3, thus achieving the oil suction and discharge operation. Preferably, the clearance between the movable plunger sleeve 3.2 and the fixed plunger 3.3 is 10-40 μm.

[0034] To guide the movable plunger sleeve 3.2 and reduce the lateral force on the fixed plunger 3.3, a movable plunger mounting hole 1.1 is provided on the housing 1 corresponding to the split-type oil suction and discharge unit 3. The fixed plunger 3.3 is fixedly mounted on the housing 1, with one end of the fixed plunger 3.3 extending into the movable plunger mounting hole 1.1. The movable plunger sleeve 3.2 is slidably mounted in the movable plunger mounting hole 1.1, with the inner cavity of the movable plunger sleeve 3.2 and the movable plunger mounting hole 1.1 having a clearance fit. Preferably, the clearance fit is 10-40 μm.

[0035] To facilitate the installation of the fixed plunger 3.3, fixed plunger mounting holes 1.4 are provided on both sides of the housing 1. The fixed plunger mounting holes 1.4 communicate with the movable plunger mounting holes 1.1. One end of the fixed plunger 3.3 is fixedly installed in the fixed plunger mounting hole 1.4, and the other end is inserted into the movable plunger mounting hole 1.1. Cover plates 6 are fixedly installed on both sides of the housing 1, and the fixed plunger 3.3 and the cover plates 6 are abutted together by a clamping block. The fixed plunger 3.3 has an internal pipeline that communicates with the inner cavity of the movable plunger sleeve 3.2. The fixed plunger 3.3 is connected to an oil suction control valve 4 and a one-way valve 5, respectively, wherein the one-way valve 5 is located in the fixed plunger mounting hole 1.4. Preferably, the oil suction control valve 4 is an electromagnetic switch valve. The A ports of the suction control valve 4 and the one-way valve 5 are connected to the internal pipeline of the fixed plunger 3.3, respectively. The B port of the suction control valve 4 is connected to the low-pressure port on the housing 1 or the inner cavity of the housing 1. The B port of the one-way valve 5 is connected to the high-pressure port on the housing 1. The A ports and B ports of the one-way valve 5 are the inlet and outlet, respectively.

[0036] To cool the split-type oil suction and discharge unit 3, an oil port 9 communicating with the inner cavity of the housing 1 is provided in the cavity formed by the inner wall of the movable plunger mounting hole 1.1, the bottom wall of the movable plunger sleeve 3.2, and the outer circular surface of the fixed plunger 3.3. When the volume of the cavity changes, cooling is achieved by drawing in cold oil from the inner cavity of the housing 1.

[0037] Left thrust bearing 1.2 and right thrust bearing 1.3 are respectively provided on the left and right sides of the inner cavity of housing 1. Positioning shoulders 2.4 are respectively provided on both sides of swashplate 2, which mate with left thrust bearing 1.2 or right thrust bearing 1.3. Left thrust bearing 1.2 and right thrust bearing 1.3 are in contact with the positioning shoulder 2.4 on the corresponding side. The axial force on the swashplate is transmitted to housing 1 through the thrust bearings, reducing the force on the bearings on both sides of the drive shaft.

[0038] Preferably, the housing 1 has an annular groove in the middle, which, together with the outer ring surface of the swashplate 2, the left thrust bearing 1.2, and the right thrust bearing 1.3, forms an annular chamber 10. The oil suction port on the housing 1 communicates with the annular chamber 10. The swashplate 2 has an annular cavity 2.1 inside, and the outer ring surface of the swashplate 2 has multiple through holes 2.2 communicating with the annular cavity 2.1. The oil suction side of the end face of the swashplate 2 has an oil suction waist-shaped groove 2.3 communicating with the annular cavity 2.1. The annular chamber 10 communicates with the chamber on the end face of the swashplate 2 through the gap between the adjacent rolling elements of the left thrust bearing 1.2 and the right thrust bearing 1.3, and further communicates with the oil suction waist-shaped groove 2.3 on the end face of the swashplate 2.

[0039] Hydraulic oil in annular chamber 10 can enter annular chamber 2.1 through through hole 2.2; it can also enter annular chamber 2.1 through the rolling element clearance of left thrust bearing 1.2 and right thrust bearing 1.3, and through the oil suction groove 2.3, and then enter the plunger cavity (such as...). Figure 1 (As indicated by the middle arrow).

[0040] In this embodiment, the number of oil suction and discharge units, the ratio of plunger working area, and the plunger arrangement can adopt the arrangement methods in the background art documents. For example:

[0041] like Figure 5 As shown, the oil suction and discharge unit has three different plunger diameters, with working areas of 1A, 2A, and 4A respectively. Here, A represents the cross-sectional area of ​​the plunger in the oil suction and discharge unit with the smallest plunger diameter. The number of oil suction and discharge units with working areas of 1A, 2A, and 4A are 3, 3, and 12 respectively. Two groups of nine oil suction and discharge units are arranged on housing 1, evenly distributed circumferentially along the drive shaft in each group, with a 20° phase difference between different groups. For ease of description, one oil suction and discharge unit is designated as number 1. The oil suction and discharge units are then sequentially numbered clockwise: units numbered 1, 7, and 13 have a working plunger area of ​​1A; units numbered 4, 10, and 16 have a working plunger area of ​​2A; and the remaining unit 4 has a working plunger area of ​​4A.

[0042] By replacing the digital displacement piston hydraulic component in the background art document with the piston hydraulic component with cooling structure disclosed in this embodiment, this application can also be used in the circuits disclosed in Embodiments 2 and 3 of the specification in the background art document.

[0043] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A plunger-type hydraulic component with a cooling structure, comprising a housing (1), a swashplate (2), a ball cup (7), a return plate (8), and multiple suction and discharge units driven by the swashplate (2), wherein at least one suction and discharge unit is a split-type suction and discharge unit (3), the split-type suction and discharge unit (3) comprising a slipper (3.1), a movable plunger sleeve (3.2), and a fixed plunger (3.3), the slipper (3.1) and the movable plunger sleeve (3.2) being connected by a ball joint, the movable plunger sleeve (3.2) being sleeved outside the fixed plunger (3.3) and slidingly connected to the fixed plunger (3.3), the movable plunger sleeve (3.2) and the fixed plunger (3.3) being clearance fit; the ball cup (7) being connected to the return plate (8) through a spherical surface, the return plate (8) pressing the slipper (3.1) onto the end face of the swashplate (2); Its features are: The housing (1) is provided with a movable plunger mounting hole (1.1), a fixed plunger (3.3) is fixedly mounted on the housing (1) and one end extends into the movable plunger mounting hole (1.1), a movable plunger sleeve (3.2) is slidably mounted in the movable plunger mounting hole (1.1) and is clearance-fitted with the movable plunger mounting hole (1.1), and the cavity formed by the inner wall of the movable plunger mounting hole (1.1), the bottom wall of the movable plunger sleeve (3.2) and the outer circular surface of the fixed plunger (3.3) is provided with an oil port (9) communicating with the inner cavity of the housing (1); The left and right sides of the inner cavity of the housing (1) are respectively provided with a left thrust bearing (1.2) and a right thrust bearing (1.3), and the left and right sides of the swashplate (2) are in contact with the left thrust bearing (1.2) and the right thrust bearing (1.3) respectively.

2. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: The swash plate (2) has an annular cavity (2.1) inside, and multiple through holes (2.2) communicating with the annular cavity (2.1) are provided on the outer annular surface of the swash plate (2). An oil-absorbing waist-shaped groove (2.3) communicating with the annular cavity (2.1) is provided on the oil-absorbing side of the end face of the swash plate (2). The swash plate (2) is provided with positioning shoulders (2.4) on both sides to cooperate with the left thrust bearing (1.2) or the right thrust bearing (1.3).

3. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: The housing (1) has an annular groove in the middle, which, together with the outer ring surface of the swashplate (2), the left thrust bearing (1.2), and the right thrust bearing (1.3), forms an annular cavity (10). The annular chamber (10) is connected to the chamber at the end face of the swashplate (2) through the gap between the adjacent rolling elements of the left thrust bearing (1.2) and the right thrust bearing (1.3).

4. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: The housing (1) is provided with fixed plunger mounting holes (1.4) on both sides. One end of the fixed plunger (3.3) is fixedly installed in the fixed plunger mounting hole (1.4). The fixed plunger (3.3) is provided with an internal pipeline that communicates with the inner cavity of the movable plunger sleeve (3.2). The fixed plunger (3.3) is connected to an oil suction control valve (4) and a one-way valve (5). The A port of the oil suction control valve (4) and the one-way valve (5) are respectively connected to the internal pipeline of the fixed plunger (3.3). The B port of the oil suction control valve (4) is connected to the low pressure port on the housing (1) or the inner cavity of the housing (1). The B port of the one-way valve (5) is connected to the high pressure port on the housing (1). The A port and B port of the check valve (5) are the inlet and outlet, respectively.

5. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: Cover plates (6) are fixedly installed on both sides of the housing (1), and a clamping block is provided between the fixed plunger (3.3) and the cover plate (6).

6. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: The clearance between the movable plunger sleeve (3.2) and the fixed plunger (3.3) is 10-40 μm, and the clearance between the movable plunger sleeve (3.2) and the movable plunger mounting hole (1.1) is 10-40 μm.

7. A plunger-type hydraulic component with a cooling structure according to claim 1, characterized in that: The plunger diameter of the oil suction and discharge unit is set in three ways. The working areas of the plunger of the oil suction and discharge unit with the three plunger diameters are 1A, 2A and 4A respectively, where A is the cross-sectional area of ​​the plunger of the oil suction and discharge unit with the smallest plunger diameter. The number of the three oil suction and discharge units with the plunger working areas of 1A, 2A and 4A are 3, 3 and 12 respectively. The oil suction and discharge unit with a plunger working area of ​​1A and 2A adopts the split oil suction and discharge unit (3), and the oil suction and discharge unit with a plunger working area of ​​4A adopts the integrated oil suction and discharge unit (11).

8. A plunger-type hydraulic component with a cooling structure according to claim 4, characterized in that: The oil suction control valve (4) is an electromagnetic switch valve.

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