Three-body type high-pressure large-displacement gear pump

Abstract

The utility model relates to the technical field of hydraulic transmission equipment, and particularly discloses a three-body type high-pressure large-displacement gear pump. A supporting and positioning structure of a bearing sleeve, a bearing and the like is adopted, a transmission mode of combining a spline and a gear is adopted, a pump body and a driving gear shaft of the same specification are completely universal, the machining process is simple, the cost is low, the bearing capacity is high, and the external interference resistance is high. And the designed bearing sleeve has the advantages of simple structure, reliable positioning, strong universality, low processing cost, good manufacturability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic transmission equipment, in particular to a three-piece high-pressure large-displacement gear pump. Background Art

[0002] The housings of common gear pumps are generally divided into a two-piece structure and a three-piece structure. The so-called three-piece structure can generally be divided into two types. One is that the bearings supporting the gear shafts are respectively placed in the cover or the rear cover, and the gear cavity is separately designed as an independent part. Its front cover, pump body and rear cover are positioned by positioning pin shafts and fastened together with bolts. The other structure is that the bearings (bearing sleeves) supporting the gears are integrated with the side plates of the oil pump and are together with the gears in the pump body. The front cover and the rear cover are installed and fixed in the pump body through positioning pin shafts. Due to the restriction of material properties, this design structure of gear pump is generally used for small-displacement gear pumps with a displacement of less than 50 mL / r. The results brought by the above solutions are as follows: the requirements for processing equipment and precision are getting higher and higher, and the cost is getting higher and higher. With the increasing pressure and displacement requirements of the equipment hydraulic system, the industry urgently hopes to reduce the manufacturing cost of the pump. At the same time, with the rise of electric equipment, the demand for double gear pumps or multi-gear pumps is also increasing, and the number of their special parts is constantly increasing, further boosting the continuous rise of the cost of the oil pump. This is the supply-demand contradiction and deficiency existing in the current hydraulic gear pump industry. At present, the industry urgently needs a high-performance, low-cost and high-reliability hydraulic gear pump to meet the ever-developing needs and solve the problems of existing supply chain constraints. Summary of the Utility Model

[0003] The utility model aims to make up for the defects of the prior art and provides a three-piece high-pressure large-displacement gear pump with high performance, low cost and high reliability.

[0004] The utility model is realized by the following technical solutions:

[0005] A three-piece high-pressure large-displacement gear pump includes an end cover and a pump body. A driving gear shaft and a driven gear shaft which are connected by meshing of two gears are arranged in the pump body. The end cover includes a front cover and a rear cover. The driving gear shaft extends out from the front cover. The feature is that side plates are respectively arranged on both sides of the gears. Two bearings are respectively sleeved on the driving gear shaft and the driven gear shaft. A bearing sleeve is sleeved outside the bearings. The side plates are located between the bearing sleeves and the gears. The bearing sleeve is provided with a positioning stop. The front cover and the rear cover are respectively provided with matching positioning holes. The front cover is provided with a stop for installing and fixing with a power take-off. The pump body has an 8-shaped cavity.

[0006] A rectangular sealing ring is arranged at the junction of the pump body, the bearing sleeve and the end cover.

[0007] A three-body high-pressure large-displacement gear pump, comprising an end cover and a pump body. The end cover includes a front cover and a rear cover. The characteristic is that there are at least two pump bodies. In each pump body, there is a driving gear shaft and a driven gear shaft connected by gear meshing. The first driving gear shaft extends out from the front cover. There is an intermediate body between adjacent pump bodies. On both sides of the gear, there are side plates respectively. On the driving gear shaft and the driven gear shaft, there are two bearings respectively. An outer bearing sleeve is sleeved on the bearing. The side plate is located between the bearing sleeve and the gear. The bearing sleeve is provided with a positioning stop. The front cover and the rear cover are respectively provided with matching positioning holes. The front cover is provided with a stop for installing and fixing with a power take-off. The pump body has an 8-shaped cavity. One side of the 8-shaped cavity is communicated with an oil inlet cavity, and one side is communicated with an oil outlet cavity. Among them, the driving gear shaft in the first pump body drives and connects all the subsequent driving gear shafts and driven gear shafts in sequence through gears and splines.

[0008] At the junction of the pump bodies, bearing sleeves and end covers at both ends, there is a rectangular sealing ring.

[0009] A 3-shaped seal is adopted between the side plate and the bearing sleeve.

[0010] There is an oil seal between the driving gear shaft at the frontmost end and the front cover.

[0011] The beneficial effects of the present utility model are:

[0012] The present utility model adopts a support and positioning structure such as bearing sleeves and bearings, and adopts a transmission method combining splines and gears, realizing the complete universality of pump bodies and driving gear shafts of the same specification, with a simple processing process, low cost, strong load-bearing capacity, and strong anti-external interference ability. The designed bearing sleeve has the advantages of simple structure, reliable positioning, strong universality, low processing cost, and good processability. Brief Description of the Drawings

[0013] The following further describes the present utility model with reference to the drawings:

[0014] Figure 1 It is a sectional structure schematic diagram of the first embodiment of the present utility model;

[0015] Figure 2 It is a sectional structure schematic diagram of the second embodiment of the present utility model;

[0016] Figure 3 It is a sectional structure schematic diagram of the third embodiment of the present utility model;

[0017] Figure 4 It is a sectional structure schematic diagram of the fourth embodiment of the present utility model;

[0018] Figure 5 It is a sectional structure schematic diagram of the front cover;

[0019] Figure 6 It is a schematic cross-sectional structure diagram of a bearing sleeve;

[0020] Figure 7 It is a schematic cross-sectional structure diagram of a pump body;

[0021] Figure 8 It is for Figure 7 The schematic cross-sectional structure diagram of the A-A direction in;

[0022] Figure 9 It is a schematic structure diagram of an intermediate body of a non-oil-separating gear pump;

[0023] Figure 10 It is a schematic structure diagram of an intermediate body of an oil-separating gear pump.

[0024] In the figure, 1 is the driving gear shaft I, 2 is the oil seal, 3 is the front cover, 3-1 is the spigot, 3-2 is the positioning hole, 4 is the rectangular sealing ring, 5 is the bearing, 6 is the bearing sleeve, 6-1 is the positioning spigot, 6-2 is the outer circle, 6-3 is the bearing hole, 7 is the 3-shaped seal, 8 is the side plate, 9 is the pump body, 9-1 is the figure-eight cavity, 10 is the rear cover, 11 is the driven gear shaft I, 12 is the intermediate body, 13 is the driving gear shaft II, 14 is the driven gear shaft II, 15 is the driving gear shaft III, 16 is the driven gear shaft III, 17 is the driving gear shaft IV, 18 is the driven gear shaft IV, 19 is the gear. Specific implementation manners

[0025] Example 1:

[0026] As Figure 1 、 Figures 5 - 7 Shown in the figure, this three-body high-pressure large-displacement gear pump includes end covers and a pump body 9. The end covers include a front cover 3 and a rear cover 10. The front cover 3 and the rear cover 10 are respectively connected to both ends of the pump body 9. The pump body 9 has a figure-eight cavity 9-1 as shown in Figure 8 The figure. One side of the figure-eight cavity 9-1 is communicated with the oil inlet cavity, and one side is communicated with the oil outlet cavity. The driving gear shaft I 1 is installed in the upper figure-eight cavity 9-1. The driving gear shaft I 1 extends out of the front cover 3. The driven gear shaft I 11 is installed in the lower figure-eight cavity 9-1. A gear 19 is respectively installed on the driving gear shaft I 1 and the driven gear shaft I 11. The two gears 19 are meshed and connected; there is a side plate 8 on both sides of the two gears 19. Bearings 5 are respectively installed on the driving gear shaft I 1 and the driven gear shaft I 11 outside the side plate 8. A bearing sleeve 6 is sleeved outside the bearing 5. A 3-shaped seal 7 is provided between the bearing sleeve 6 and the side plate 8.

[0027] The front cover 3 includes a spigot 3-1 and a positioning hole 3-2 for installation and fixed connection with a power take-off. The rear cover 10 also has a positioning hole 3-2.

[0028] The bearing sleeve 6 has a positioning shoulder 6-1 that matches the positioning hole 3-2. The positioning shoulder 6-1 ensures the position accuracy of the front cover 3 or the rear cover 10 by mating with the positioning hole 3-2 of the front cover 3 or the rear cover 10. At the junction of the bearing sleeve 6, the pump body 9, and the front cover 3 at the front cover 3, a rectangular sealing ring 4 is installed.

[0029] At the junction of the bearing sleeve 6, the pump body 9, and the rear cover 10 at the rear cover 10, a rectangular sealing ring 4 is also installed.

[0030] Between the front cover 3 and the driving gear shaft I 1, it is sealed by an oil seal 2.

[0031] The outer circle 6-2 of the bearing sleeve 6 contacts the figure-eight cavity 9-1 to ensure the position accuracy of the pump body 9.

[0032] The shape of the side plate 8 is the same as that of the figure-eight cavity 9-1 to ensure the position accuracy of the side plate 8.

[0033] The bearing sleeve 6 also includes a bearing hole 6-3. A bearing 5 is installed in the bearing hole 6-3. The bearing sleeve 6 can not only support the bearing 5 but also cooperate with the front cover 3 to play a positioning role, replacing the positioning pin shaft in the prior art. Through the cooperation with the bearing 5, the bearing sleeve 6 ensures the position accuracy of the cooperation between the driving gear shaft I 1, the driven gear shaft I 11, and the bearing 5. The driving gear shaft I 1 and the driven gear shaft I 11 respectively cooperate with the bearing 5 to ensure the position accuracy during their own rotation processes.

[0034] Through the transmission of the above series of position accuracies, it is ultimately ensured that the driving gear shaft I 1 is coaxial with the shoulder 3-1 on the outer side of the front cover 3. After the gear pump is installed, it ensures that the position accuracy of the driving gear shaft I 1 of the gear pump and the shoulder 3-1 meets the requirements of power transmission.

[0035] When the driving gear shaft I 1 receives a rotational torque from the power mechanism input, the driving gear shaft I 1 transmits the torque to the driven gear shaft I 11, and they rotate together. The oil suction and oil pressure processes of the gear pump are realized through the meshing of the gears 19.

[0036] The gear pump of the above technical solution is suitable for a displacement range of: 50 mL / r to 350 mL / r.

[0037] Embodiment 2:

[0038] As Figure 2 、 Figures 5 - 10 shown, on the basis of Embodiment 1, an additional pump body 9 is added. The two pump bodies 9 are connected by an intermediate body 12. The structure of the intermediate body 12 is divided into two types: oil separation and non-oil separation as Figure 9 and Figure 10 shown according to the specific situation of the gear pump; as Figure 2As shown in the figure, two gear shafts, namely the driving gear shaft II 13 and the driven gear shaft II 14, are also installed in the pump body 9. They are respectively located in the figure-eight cavity 9-1. The driving gear shaft II 13 is at the lower part and is connected to the driven gear shaft I 11 through a spline. The driven gear shaft I 11 drives the driving gear shaft II 13 to rotate through the spline. The driven gear shaft II 14 is at the upper part and is driven to rotate by the driving gear shaft II 13 through two meshing gears 19.

[0039] Embodiment 3:

[0040] As Figure 3 , Figures 5 - 10 shown in the figure, on the basis of Embodiment 2, an additional pump body 9 and an intermediate body 12 are added. The structure of the intermediate body 12 is the same as above. In the pump body 9, a driving gear shaft III 15 and a driven gear shaft III 16 connected by gear meshing are installed. The driving gear shaft III 15 is at the lower part and is connected to the driving gear shaft II 13 through a spline. The driven gear shaft III 16 is at the upper part. The transmission mode is: driving gear shaft I 1 → driven gear shaft I 11 → driving gear shaft II 13 → driving gear shaft III 15 → driven gear shaft III 16. At the same time, there is also driving gear shaft II 13 → driven gear shaft II 14.

[0041] Embodiment 4:

[0042] As Figure 4 , Figures 5 - 10 shown in the figure, on the basis of Embodiment 2, an additional pump body 9 and an intermediate body 12 are added. The structure of the intermediate body 12 is the same as above. In the pump body 9, a driving gear shaft IV 17 and a driven gear shaft IV 18 connected by gear 19 meshing are installed. The driving gear shaft IV 17 is at the upper part and is connected to the driven gear shaft II 14 through a spline. The driven gear shaft III 16 is at the lower part. The transmission mode is: driving gear shaft I 1 → driven gear shaft I 11 → driving gear shaft II 13 → driven gear shaft II 14 → driving gear shaft IV 17 → driven gear shaft IV 18.

[0043] The above are the embodiments of the single pump body 9, double pump and triple pump. If a four-pump, five-pump, etc. are needed, the pump body 9 and the intermediate body 12 can be continuously added on the basis of Embodiment 3 or Embodiment 4, and will not be elaborated here.

[0044] Except for the technical features described in the specification, the rest of the technical features are known technologies to those skilled in the art.

Claims

1. A three-body high-pressure large-displacement gear pump, comprising an end cover and a pump body (9), wherein a driving gear shaft and a driven gear shaft meshingly connected via two gears (19) are provided in the pump body (9), wherein the end cover comprises a front cover (3) and a rear cover (10), wherein the driving gear shaft extends from the front cover (3), and wherein: Side plates (8) are respectively provided on both sides of the gear (19); two bearings (5) are respectively sleeved on the driving gear shaft and the driven gear shaft; the bearings (5) are respectively sleeved with bearing sleeves (6); the side plates (8) are located between the bearing sleeves (6) and the gear (19); the bearing sleeves (6) are provided with positioning stoppers (6-1); the front cover (3) and the rear cover (10) are respectively provided with matching positioning holes (3-2); the front cover (3) is provided with stoppers (3-1) for mounting and fixing with the power take-off; and the pump body (9) has an 8-shaped cavity (9-1).

2. The three-body high-pressure large-displacement gear pump according to claim 1 is characterized in that: A rectangular sealing ring (4) is provided at the junction of the pump body (9), the bearing sleeve (6) and the end cover.

3. A three-body high-pressure large-displacement gear pump, comprising an end cover and a pump body (9), wherein the end cover comprises a front cover (3) and a rear cover (10), wherein: There are at least two pump bodies (9), each pump body (9) is provided with a driving gear shaft and a driven gear shaft connected by gear meshing, the first driving gear shaft protrudes from the front cover (3), an intermediate body (12) is provided between adjacent pump bodies (9), side plates (8) are provided on both sides of the gears, two bearings (5) are respectively sleeved on the driving gear shaft and the driven gear shaft, the bearings (5) are covered with bearing sleeves (6), the side plates (8) are located between the bearing sleeves (6) and the gears (19); the bearing sleeves (6) are provided The pump body (9) has a positioning stop (6-1), and the front cover (3) and the rear cover (10) are respectively provided with matching positioning holes (3-2); the front cover (3) is provided with a stop (3-1) for mounting and fixing with the power take-off; the pump body (9) has an 8-shaped cavity (9-1), one side of the 8-shaped cavity (9-1) is connected to the oil inlet cavity, and the other side is connected to the oil outlet cavity; wherein the driving gear shaft in the first pump body (9) is sequentially connected to all the driving gear shafts and driven gear shafts behind it through the gear (19) and the spline.

4. The three-body high-pressure large-displacement gear pump according to claim 3 is characterized in that: Rectangular sealing rings (4) are provided at the junctions of the pump body (9), the bearing sleeve (6) and the end cover at both ends.

5. The three-body high-pressure large-displacement gear pump according to any one of claims 1 to 4, characterized in that: A three-shaped seal (7) is used between the side plate (8) and the bearing sleeve (6).

6. The three-body high-pressure large-displacement gear pump according to any one of claims 1 to 4, characterized in that: An oil seal (2) is provided between the driving gear shaft at the front end and the front cover (3).

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