Gear pump with double outlet shaft structure

Abstract

The utility model relates to a kind of double-output shaft structure gear pumps, belong to gear pump technical field;Including pump body, the front and rear ends opening of pump body are respectively fixedly provided with front side pump cover and rear side pump cover, rotationally arranged with first transmission shaft and second transmission shaft distributed in upper and lower in the inside of pump body, first transmission shaft outside fixed sleeve is connected with first gear, second transmission shaft outside fixed sleeve is connected with second gear, first gear and second gear are engaged, the front end of first transmission shaft is stretched to the outside of front side pump cover, the rear end of second transmission shaft is stretched to the outside of rear side pump cover;Solved the problem that current double gear pump cannot be freely arranged to two oil inlets and two oil outlets.

Description

Technical Field

[0001] This utility model belongs to the field of gear pump technology, specifically relating to a dual-output shaft gear pump. Background Technology

[0002] Double gear pumps, with their compact structure, light weight, and strong self-priming capability, are widely used in various industries such as mining equipment, metallurgical equipment, construction machinery, engineering machinery, agricultural and forestry machinery, and military industry. With the technological advancements in the hydraulic pump industry, the requirements for hydraulic gear pump oil pipe routing are becoming increasingly stringent, needing to meet the matching requirements of engines and transmissions under various operating conditions. The distribution of inlet and outlet oil pipes is becoming increasingly diversified; oil pipes of the same type must meet requirements for distribution on the same side as well as on both sides. Traditional double gear pumps cannot meet these requirements. Therefore, achieving both series connection of the oil pump and diversified oil pipe distribution has become a crucial technical challenge for double gear pumps. Utility Model Content

[0003] This invention overcomes the shortcomings of the prior art by proposing a dual-output shaft gear pump, thus solving the problem that current dual gear pumps cannot freely arrange the two inlet ports and two outlet ports.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0005] A dual-output shaft gear pump includes a pump body. A front pump cover and a rear pump cover are fixedly installed at the front and rear openings of the pump body, respectively. A first drive shaft and a second drive shaft are rotatably installed inside the pump body, distributed vertically. A first gear is fixedly sleeved on the outside of the first drive shaft, and a second gear is fixedly sleeved on the outside of the second drive shaft. The first gear and the second gear mesh with each other. The front end of the first drive shaft extends to the outside of the front pump cover, and the rear end of the second drive shaft extends to the outside of the rear pump cover.

[0006] Furthermore, multiple screws pass through the front pump cover and are screwed into the pump body, thus connecting the front pump cover to the pump body; multiple screws pass through the rear pump cover and are screwed into the pump body, thus connecting the rear pump cover to the pump body; the front pump cover and the rear pump cover have the same structure.

[0007] Furthermore, the rear end of the first drive shaft is rotatably mounted on the inner side of the rear pump cover, and the front end of the second drive shaft is rotatably mounted on the inner side of the front pump cover.

[0008] Furthermore, two bushings are provided inside the pump body. The two bushings are located on the front and rear sides of the first gear and the second gear, respectively. The first drive shaft is located at the front and rear ends of the first gear and is rotatably inserted into the two bushings. The second drive shaft is located at the front and rear ends of the second gear and is rotatably inserted into the two bushings.

[0009] Furthermore, two annular grooves are provided on the end face of the front bushing near the front pump cover. The two annular grooves are respectively fitted onto the outside of the first drive shaft and the second drive shaft. A baffle and a sealing ring are respectively provided inside each annular groove.

[0010] Furthermore, two annular grooves are provided on the end face of the rear bushing near the rear pump cover. The two annular grooves are respectively fitted onto the outside of the first drive shaft and the second drive shaft. A baffle and a sealing ring are respectively provided inside each annular groove.

[0011] Furthermore, a front mounting port is provided on the front pump cover, through which the front end of the first drive shaft extends to the outside of the front pump cover; a skeleton oil seal is provided inside the front mounting port, and the skeleton oil seal is located outside the first drive shaft; a retaining ring is provided outside the front mounting port.

[0012] Furthermore, a rear mounting port is provided on the rear pump cover, through which the rear end of the second drive shaft extends to the outside of the rear pump cover; a skeleton oil seal is provided inside the rear mounting port, and the skeleton oil seal is located outside the second drive shaft; a retaining ring is provided outside the rear mounting port.

[0013] Furthermore, a keyway is provided on the outer side of the front end of the first drive shaft extending from the front pump cover, and a keyway is provided on the outer side of the rear end of the second drive shaft extending from the rear pump cover.

[0014] Furthermore, an oil inlet is provided on the right side of the pump body, and an oil outlet is provided on the left side of the pump body.

[0015] The beneficial effects of this utility model compared to the prior art are as follows:

[0016] (1) The dual-output shaft gear pump provided by this utility model can replace the front pump cover with the rear pump cover when the pump cover is processed. By improving the tooling, four pump covers can be clamped at one time, the processing procedure is optimized to reduce the number of processes and shorten the processing time. It is suitable for mass production and the processing efficiency is greatly improved.

[0017] (2) The present invention provides a dual-output shaft gear pump, which connects the front and rear gear pumps through a coupling. Through the two sets of combined connection forms, the two oil inlets and two oil outlets of the dual pump can be freely interchanged, that is, they can be distributed on the same side or on both sides. In this way, oil can be supplied to the oil tanks on both sides separately in special circumstances. At the same time, it overcomes the disadvantage of easy oil leakage between the front and rear pumps of the traditional dual gear oil pump, and plays a good role in isolating heat transfer and improving the service life of the oil seal. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a front view of the front pump cover;

[0021] Figure 3 This is a side sectional view of the front pump cover;

[0022] Figure 4 This is a schematic diagram of the lateral connection between the first drive shaft and the first gear;

[0023] Figure 5 This is a schematic diagram of the positive connection between the first drive shaft and the first gear;

[0024] Figure 6 This is a schematic diagram of a structure in which the oil inlet and outlet of two gear pumps are connected in series and located on both sides.

[0025] Figure 7 This is a schematic diagram showing the connection of two gear pumps connected in series, with both inlet and outlet ports located on the same side.

[0026] Among them, 1 is the pump body, 2 is the front pump cover, 3 is the rear pump cover, 4 is the first drive shaft, 5 is the second drive shaft, 6 is the first gear, 7 is the second gear, 8 is the screw, 9 is the O-ring, 10 is the bushing, 11 is the baffle, 12 is the sealing ring, 13 is the skeleton oil seal, 14 is the retaining ring, 15 is the oil inlet, and 16 is the oil outlet. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0028] like Figure 1 As shown in Figure 7, this utility model provides a dual-output shaft gear pump, including a pump body 1. A front pump cover 2 and a rear pump cover 3 are fixedly installed at the front and rear openings of the pump body 1, respectively. A first drive shaft 4 and a second drive shaft 5 are rotatably installed inside the pump body 1, distributed vertically. A first gear 6 is fixedly sleeved on the outside of the first drive shaft 4, and a second gear 7 is fixedly sleeved on the outside of the second drive shaft 5. The first gear 6 and the second gear 7 mesh with each other. The front end of the first drive shaft 4 extends to the outside of the front pump cover 2, and the rear end of the second drive shaft 5 extends to the outside of the rear pump cover 3.

[0029] Multiple screws 8 pass through the front pump cover 2 and are screwed into the pump body 1, thus connecting the front pump cover 2 and the pump body 1. Similarly, multiple screws 8 pass through the rear pump cover 3 and are screwed into the pump body 1, thus connecting the rear pump cover 3 and the pump body 1. An O-ring 9 is provided on the contact surface between the pump body 1 and both the front and rear pump covers 2 and 3.

[0030] The rear end of the first drive shaft 4 is rotatably mounted on the inner side of the rear pump cover 3, and the front end of the second drive shaft 5 is rotatably mounted on the inner side of the front pump cover 2.

[0031] Two bushings 10 are provided inside the pump body 1. The two bushings 10 are located on the front and rear sides of the first gear 6 and the second gear 7, respectively. The first drive shaft 4 is located at the front and rear ends of the first gear 6 and is rotatably inserted into the two bushings 10. The second drive shaft 5 is located at the front and rear ends of the second gear 7 and is rotatably inserted into the two bushings 10.

[0032] Two annular grooves are provided on the end face of the front bushing 10 near the front pump cover 2. The two annular grooves are respectively fitted onto the outside of the first drive shaft 4 and the second drive shaft 5. A baffle 11 and a sealing ring 12 are respectively provided in each annular groove. The baffle 11 is used to fix the sealing ring 12, and the sealing ring 12 is used to ensure the sealing between the front bushing 10 and the front pump cover 2.

[0033] Two annular grooves are provided on the end face of the rear bushing 10 near the rear pump cover 3. The two annular grooves are respectively fitted onto the outside of the first drive shaft 4 and the second drive shaft 5. A baffle 11 and a sealing ring 12 are respectively provided in each annular groove. The baffle 11 is used to fix the sealing ring 12, and the sealing ring 12 is used to ensure the sealing between the rear bushing 10 and the rear pump cover 3.

[0034] A front mounting port is provided on the front pump cover 2, and the front end of the first drive shaft 4 extends through the front mounting port to the outside of the front pump cover 2. A skeleton oil seal 13 is provided inside the front mounting port, and the skeleton oil seal 13 is located outside the first drive shaft 4; a retaining ring 14 is provided outside the front mounting port to fix the skeleton oil seal 13.

[0035] A rear mounting port is provided on the rear pump cover 3, and the rear end of the second drive shaft 5 extends through the rear mounting port to the outside of the rear pump cover 3. A skeleton oil seal 13 is provided inside the rear mounting port, and the skeleton oil seal 13 is located outside the second drive shaft 5; a retaining ring 14 is provided outside the rear mounting port to fix the skeleton oil seal 13.

[0036] The first drive shaft 4 extends outward from the front end of the front pump cover 2 and has a keyway, while the second drive shaft 5 extends outward from the rear end of the rear pump cover 3 and has a keyway.

[0037] An oil inlet 15 is provided on the right side of the pump body 1, and an oil outlet 16 is provided on the left side of the pump body 1.

[0038] When the first drive shaft 4 rotates under the drive of an external force, the first drive shaft 4 drives the first gear 6 to rotate, the first gear 6 drives the second gear 7 to rotate, and the second gear 7 drives the second drive shaft 5 to drive, thereby pressing the oil on the oil inlet 15 side to the oil outlet 16 side and discharging it outward.

[0039] The front pump cover 2 and the rear pump cover 3 have the same structure. The first drive shaft 4 and its assembly with the first gear 6, and the second drive shaft 5 and its assembly with the second gear 7 have the same structure. Therefore, the front pump cover 2 and the rear pump cover 3 can be interchanged, as can the first drive shaft 4 and its assembly with the first gear 6, and the second drive shaft 5 and its assembly with the second gear 7. When machining the pump covers, since the front pump cover 2 and the rear pump cover 3 have the same structure, four pump covers can be clamped at once by improving the tooling. This optimizes the machining process, reduces the number of steps, shortens the machining time, and is suitable for mass production, greatly improving machining efficiency.

[0040] like Figure 7 As shown, when two gear pumps are connected in series to form a tandem pump, the rear end of the second drive shaft 5 of the first gear pump and the front end of the first drive shaft 4 of the second gear pump are connected by a coupling. At this time, the oil inlets 15 of the two gear pumps are located on the same side of the tandem pump, and the oil outlets 16 of the two gear pumps are located on the same side of the tandem pump.

[0041] like Figure 6 As shown, when two gear pumps are connected in series to form a double pump, the rear end of the second drive shaft 5 of the first gear pump is connected to the rear end of the second drive shaft 5 of the second gear pump through a coupling. At this time, the oil inlets 15 of the two gear pumps are located on both sides of the double pump, and the oil outlets 16 of the two gear pumps are located on both sides of the double pump.

[0042] Traditional double gear oil pumps consist of a front pump cover, a front pump body, an intermediate body, a rear pump body, and a rear pump cover. Internally, they are composed of a front drive gear, a rear drive gear, a front driven gear, and a rear driven gear connected in series. Although the structure is relatively compact, the oil inlet 15 and oil outlet 16 of the two gear pumps must be located on the same side due to the structure of the internal side plate or bushing 10. While this type of double gear oil pump can meet most customer operating conditions, it cannot meet the requirements of traditional double gear pumps in special operating conditions, such as when the two gear pumps are supplied with oil from two oil tanks and the space structure is limited, requiring the oil inlet 15 of the two gear pumps to be on opposite sides.

[0043] The gear pump provided by this utility model has a dual-output shaft structure. Two gear pumps, one inlet and one outlet, are connected by a coupling. Through two combined connection methods, the two inlet ports 15 and two outlet ports 16 of the dual pump can be freely interchanged, meaning they can be distributed on the same side or on both sides. This allows for independent oil supply to the oil tanks on both sides in special circumstances. It also overcomes the disadvantage of traditional dual gear pumps being prone to oil leakage between the front and rear pumps, effectively isolating heat transfer and improving the service life of the oil seals. In summary, this utility model possesses the characteristics of a traditional dual pump while also incorporating the unique features of the two-sided distribution of the inlet ports 15 and the heat insulation between the front and rear pumps, thus better meeting user needs.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A gear pump with a dual-output shaft structure, characterized in that: The pump body (1) includes a front pump cover (2) and a rear pump cover (3) fixedly installed at the front and rear openings of the pump body (1). Inside the pump body (1), a first drive shaft (4) and a second drive shaft (5) are rotatably arranged vertically. A first gear (6) is fixedly sleeved on the outside of the first drive shaft (4), and a second gear (7) is fixedly sleeved on the outside of the second drive shaft (5). The first gear (6) and the second gear (7) mesh with each other. The front end of the first drive shaft (4) extends to the outside of the front pump cover (2), and the rear end of the second drive shaft (5) extends to the outside of the rear pump cover (3).

2. The dual-output shaft gear pump according to claim 1, characterized in that: Multiple screws (8) pass through the front pump cover (2) and are screwed into the pump body (1), thereby connecting the front pump cover (2) and the pump body (1); multiple screws (8) pass through the rear pump cover (3) and are screwed into the pump body (1), thereby connecting the rear pump cover (3) and the pump body (1); the front pump cover (2) and the rear pump cover (3) have the same structure.

3. The dual-output shaft gear pump according to claim 1, characterized in that: The rear end of the first drive shaft (4) is rotatably disposed on the inner side of the rear pump cover (3), and the front end of the second drive shaft (5) is rotatably disposed on the inner side of the front pump cover (2).

4. A dual-output shaft gear pump according to claim 1, characterized in that: Two bushings (10) are provided inside the pump body (1). The two bushings (10) are located on the front and rear sides of the first gear (6) and the second gear (7), respectively. The first drive shaft (4) is located at the front and rear ends of the first gear (6) and is rotatably inserted into the two bushings (10), respectively. The second drive shaft (5) is located at the front and rear ends of the second gear (7) and is rotatably inserted into the two bushings (10).

5. A dual-output shaft gear pump according to claim 4, characterized in that: Two annular grooves are provided on the end face of the front bushing (10) near the front pump cover (2). The two annular grooves are respectively fitted onto the outside of the first drive shaft (4) and the second drive shaft (5). A baffle (11) and a sealing ring (12) are respectively provided inside each annular groove.

6. A dual-output shaft gear pump according to claim 4, characterized in that: Two annular grooves are provided on the end face of the rear bushing (10) near the rear pump cover (3). The two annular grooves are respectively fitted onto the outside of the first drive shaft (4) and the second drive shaft (5). A baffle (11) and a sealing ring (12) are respectively provided inside each annular groove.

7. A dual-output shaft gear pump according to claim 1, characterized in that: A front mounting port is provided on the front pump cover (2), and the front end of the first drive shaft (4) extends through the front mounting port to the outside of the front pump cover (2); a skeleton oil seal (13) is provided on the inside of the front mounting port, and the skeleton oil seal (13) is located on the outside of the first drive shaft (4); a retaining ring (14) is provided on the outside of the front mounting port.

8. A gear pump with a dual-output shaft structure according to claim 1, characterized in that: A rear mounting port is provided on the rear pump cover (3), and the rear end of the second drive shaft (5) extends through the rear mounting port to the outside of the rear pump cover (3); a skeleton oil seal (13) is provided on the inside of the rear mounting port, and the skeleton oil seal (13) is located on the outside of the second drive shaft (5); a retaining ring (14) is provided on the outside of the rear mounting port.

9. A dual-output shaft gear pump according to claim 1, characterized in that: The first drive shaft (4) extends out of the front end of the front pump cover (2) and has a keyway on the outer side. The second drive shaft (5) extends out of the rear end of the rear pump cover (3) and has a keyway on the outer side.

10. A dual-output shaft gear pump according to claim 1, characterized in that: An oil inlet (15) is provided on the right side of the pump body (1), and an oil outlet (16) is provided on the left side of the pump body (1).

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