Large-displacement and high-pressure duplex hydraulic pump for air cooling machine

Abstract

The utility model relates to the technical field of hydraulic pumps, in particular to a large-displacement and high-pressure duplex hydraulic pump for an air cooler, which comprises a pump body, the pump body comprises a sliding bearing, a bearing seat and a sealing cover plate, a pump inner cavity is arranged in the pump body, and the pump inner cavity comprises an upper sealing cavity, a lower sealing cavity, a left sealing cavity and a right sealing cavity. A driving gear, an upper driven gear and a lower driven gear are arranged in the pump inner cavity; the axial clearance of the driving gear, the upper driven gear and the lower driven gear is # imgabs 0 #, the radial clearance of the upper driven gear and the lower driven gear is # imgabs 1 #, and the radial size of an inner cavity of the pump is # imgabs 2 #. The double hydraulic pump solves the technical problem that the internal leakage problem of the double hydraulic pump affects the volume efficiency and the working performance of the gear pump; and compared with the prior art, the volumetric efficiency of the hydraulic pump is not reduced, the requirement of an equipment hydraulic system is met, and the practicability is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to a large-displacement, high-pressure double hydraulic pump for an air-cooling machine. Background Art

[0002] The twin hydraulic pump is installed at the output gearbox connection of the air-cooled diesel engine. It relies on the output torque of the diesel engine as the driving source, sucks oil from the hydraulic oil tank, and outputs high-pressure hydraulic oil to the actuator, which can meet the performance requirements of large displacement, continuous and stable high pressure (volume efficiency will not be reduced) of the chassis hydraulic system.

[0003] The duplex hydraulic pump is mainly composed of two pairs of gears, a casing, an intermediate body, a pump cover, a shaft and bearings, and a sealing cover plate. There are two pairs of external meshing gears inside the pump body, and the two end faces of the gears are sealed by the cover plates. In this way, the pump body, the cover plate, and the tooth grooves of the gears form multiple sealed chambers. The gear tooth meshing line separates the left and right sealed chambers to form suction and pressure oil chambers. The early trial production and development of the duplex hydraulic pump was verified by tests to have internal leakage problems, which affected the volumetric efficiency and working performance of the gear pump, especially in low-speed tests, the volumetric efficiency did not meet the index requirements (≥70%), and the actual measured value was below 60%.

[0004] Therefore, in order to solve the above problems, we propose a large-displacement, high-pressure double hydraulic pump for air-cooled machines. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the utility model provides a large-displacement, high-pressure duplex hydraulic pump for an air-cooled machine, which solves the problem of internal leakage in the duplex hydraulic pump, affecting the volumetric efficiency and working performance of the gear pump, especially the technical problem that the volumetric efficiency does not meet the index requirement (≥70%) during low-speed tests and the actual measured value is below 60%.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A large displacement, high pressure double hydraulic pump for air cooling machine comprises a pump body, the pump body comprises a sliding bearing, a bearing seat and a sealing cover plate, a pump inner cavity is arranged in the pump body, the pump inner cavity comprises an upper sealing cavity, a lower sealing cavity, a left sealing cavity and a right sealing cavity, a driving gear is arranged in the pump inner cavity, an upper driven gear is arranged in the pump inner cavity, a lower driven gear is arranged in the pump inner cavity, the upper driven gear is meshed and installed with the driving gear, the upper driven gear is located at one side of the upper sealing cavity, the lower driven gear is meshed and installed with the driving gear, the lower driven gear is located at one side of the lower sealing cavity, and the axial clearance between the driving gear, the upper driven gear and the lower driven gear is The radial clearance of the driving gear, the upper driven gear and the lower driven gear is The radial dimension of the pump cavity is

[0010] Preferably, the width of the driving gear and the upper driven gear and the lower driven gear is the same as the thickness of the pump cavity, the bearing seat is fixedly installed on the left and right sides of the pump body, and three through holes are opened in the middle of the bearing seat corresponding to the axis of the driving gear, the upper driven gear and the lower driven gear, and sliding bearings are placed in the through holes.

[0011] Preferably, two left oil holes and two right oil holes are respectively opened on both sides of the pump body corresponding to the meshing points of the driving gear, the upper driven gear and the lower driven gear, and a sealing cover plate is fixedly installed on the outer surface of the bearing seat.

[0012] (III) Beneficial effects

[0013] 1. The utility model solves the problem of internal leakage in a double hydraulic pump, which affects the volumetric efficiency and working performance of a gear pump. Compared with the prior art, the utility model ensures that the volumetric efficiency of the hydraulic pump will not be reduced, meets the requirements of equipping a hydraulic system, and effectively improves practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0015] Figure 1 This is a structural diagram of the pump body of the utility model;

[0016] Figure 2 This is a structural diagram of the installation of the sealing cover plate of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of a double hydraulic pump of the utility model.

[0018] Legend: 1. Pump body; 11. Pump inner cavity; 12. Upper sealing cavity; 13. Lower sealing cavity; 14. Left sealing cavity; 15. Right sealing cavity; 16. Left oil hole; 17. Driving gear; 18. Upper driven gear; 19. Lower driven gear; 2. Sliding bearing; 21. Bearing seat; 22. Sealing cover plate; 24. Right oil hole. DETAILED DESCRIPTION

[0019] The embodiment of the present application provides a large-displacement, high-pressure duplex hydraulic pump for an air-cooled machine, which effectively solves the problem of internal leakage in the duplex hydraulic pump, affecting the volumetric efficiency and working performance of the gear pump, especially the technical problem that the volumetric efficiency does not meet the index requirement (≥70%) during low-speed tests and the actual measured value is less than 60%.

[0020] Example

[0021] according to Figure 1 , Figure 2 ,and Figure 3 As shown, the technical solution in the embodiment of the present application effectively solves the problem of internal leakage in the duplex hydraulic pump, which affects the volumetric efficiency and working performance of the gear pump, especially the volumetric efficiency does not meet the index requirement (≥70%) during the low-speed test, and the measured value is less than 60%. The overall idea is as follows:

[0022] In view of the problems existing in the prior art, the utility model provides a large-displacement, high-pressure double hydraulic pump for an air-cooled machine, comprising a pump body 1, the pump body 1 comprising a sliding bearing 2, a bearing seat 21 and a sealing cover plate 22, a pump inner cavity 11 is arranged in the pump body 1, the pump inner cavity 11 comprises an upper sealing cavity 12, a lower sealing cavity 13, a left sealing cavity 14 and a right sealing cavity 15, a driving gear 17 is arranged in the pump inner cavity 11, an upper driven gear 18 is arranged in the pump inner cavity 11, and a lower driven gear 19 is arranged in the pump inner cavity 11, wherein the upper driven gear 18 is meshed and installed with the driving gear 17, the upper driven gear 18 is located on one side of the upper sealing cavity 12, the lower driven gear 19 is meshed and installed with the driving gear 17, the lower driven gear 19 is located on one side of the lower sealing cavity 13, and the axial clearance between the driving gear 17, the upper driven gear 18 and the lower driven gear 19 is The radial clearance between the driving gear 17, the upper driven gear 18 and the lower driven gear 19 is The radial dimension of the pump cavity 11 is The design uses a reasonable axial clearance (the axial dimensions of the front and rear pump master and slave gears are changed from the original Adjust to ), and the parts processing adopts advanced equipment in the machining center to ensure the dimensional accuracy and consistency of the parts. In addition, the advanced axial clearance automatic compensation mechanism technology is selected to strictly control the axial leakage.

[0023] The width of the driving gear 17 and the upper driven gear 18 and the lower driven gear 19 is the same as the thickness of the pump cavity 11. The bearing seat 21 is fixedly installed on the left and right sides of the pump body 1. Three through holes are opened in the middle of the bearing seat 21 corresponding to the axis of the driving gear 17, the upper driven gear 18 and the lower driven gear 19, and sliding bearings 2 are placed in the through holes. Two left oil holes 16 and two right oil holes 24 are respectively opened on both sides of the pump body 1 corresponding to the meshing points of the driving gear 17, the upper driven gear 18 and the lower driven gear 19. A sealing cover plate 22 is fixedly installed on the outer surface of the bearing seat 21.

[0024] Working principle:

[0025] Axial leakage is caused by a certain axial clearance between the gear end face and the end cover. If the axial clearance is increased, the leakage will increase, and the volumetric efficiency of the hydraulic pump will inevitably decrease. On the contrary, if the axial clearance is reduced, although the leakage will decrease, the mechanical wear of the internal parts of the hydraulic pump will increase, thereby reducing the mechanical efficiency of the hydraulic pump. Therefore, after repeated optimization design and experimental demonstration, the design uses a reasonable axial clearance (the axial size of the front and rear pump master and slave gears is changed from the original Adjust to ), and the parts processing adopts advanced equipment in the machining center to ensure the dimensional accuracy and consistency of the parts. In addition, the advanced axial clearance automatic compensation mechanism technology is selected to strictly control the axial leakage.

[0026] Radial leakage is caused by a certain gap between the top circle of the gear teeth inside the hydraulic pump and the inner cavity of the pump body. Because the radial gap leakage path is long, the leakage amount is small. Therefore, after repeated optimization design and test demonstration, the design selects a reasonable radial gap (the radial size of the main and slave gears of the front and rear pumps is The radial dimension of the hydraulic pump body cavity has been changed from the original Adjust to ), coupled with the use of advanced radial hydraulic balancing technology, effectively controls radial leakage.

[0027] The improved duplex hydraulic pump has been subjected to various performance tests and special environment practicality tests. It has been verified that the improved hydraulic pump has no problem of decreased volumetric efficiency and has met the technical index requirements. In particular, the measured value of the volumetric efficiency in the low-speed test has reached more than 75%, meeting the technical index requirements (≥70%).

[0028] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A large displacement, high pressure double hydraulic pump for an air-cooled machine, comprising a pump body (1), wherein the pump body (1) comprises a sliding bearing (2), a bearing seat (21) and a sealing cover plate (22), characterized in that: The pump body (1) is provided with a pump inner cavity (11), the pump inner cavity (11) comprises an upper sealing cavity (12), a lower sealing cavity (13), a left sealing cavity (14) and a right sealing cavity (15), a driving gear (17) is provided in the pump inner cavity (11), an upper driven gear (18) is provided in the pump inner cavity (11), and a lower driven gear (19) is provided in the pump inner cavity (11); The upper driven gear (18) is meshed with the driving gear (17), and the upper driven gear (18) is located on one side of the upper sealing chamber (12). The lower driven gear (19) is meshed with the driving gear (17), and the lower driven gear (19) is located on one side of the lower sealing chamber (13). The axial clearance between the driving gear (17), the upper driven gear (18) and the lower driven gear (19) is The radial clearance between the driving gear (17), the upper driven gear (18) and the lower driven gear (19) is The radial dimension of the pump inner cavity (11) is 2. A large displacement, high pressure double hydraulic pump for air cooler according to claim 1, characterized in that: The widths of the driving gear (17), the upper driven gear (18) and the lower driven gear (19) are the same as the thickness of the pump inner cavity (11).

3. A large displacement, high pressure double hydraulic pump for air cooler according to claim 2, characterized in that: The bearing seat (21) is fixedly mounted on the left and right sides of the pump body (1).

4. A large displacement, high pressure double hydraulic pump for air cooler according to claim 3, characterized in that: Three through holes are provided in the middle of the bearing seat (21) at positions corresponding to the axis centers of the driving gear (17), the upper driven gear (18) and the lower driven gear (19), and sliding bearings (2) are placed in the through holes.

5. A large displacement, high pressure double hydraulic pump for air cooler according to claim 4, characterized in that: Two left oil holes (16) and two right oil holes (24) are respectively formed on both sides of the pump body (1) at positions corresponding to meshing points of the driving gear (17), the upper driven gear (18) and the lower driven gear (19).

6. A large displacement, high pressure double hydraulic pump for air cooler according to claim 5, characterized in that: A sealing cover plate (22) is fixedly mounted on the outer surface of the bearing seat (21).

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