Shell structure for balancing starting pressure of gear pump, gear pump and vehicle

Abstract

The utility model relates to the technical field of hydraulic gear pumps, in particular to a shell structure for balancing starting pressure of a gear pump, the gear pump and a vehicle. The shell structure is installed on the outer end face, perpendicular to the hydraulic oil flowing direction, of the shaft sleeve, and a balance groove is formed in the shell structure. The balance grooves are formed in the inner end face of the shell structure, the inner end face is attached to the shaft sleeve, the inner end face is divided into a high-pressure area and a low-pressure area in the flowing direction of hydraulic oil, the high-pressure area and the low-pressure area are each provided with one balance groove, the areas of the two balance grooves are equal, and each balance groove is communicated with one oil channel. And partial area of the balance groove covers the outer end face of the shaft sleeve. According to the utility model, the problem that local oil films on the inner end face of the shaft sleeve and the end face of the gear are damaged due to the fact that high-pressure oil enters too slowly at the initial stage of use of the floating shaft sleeve and cannot be timely balanced at the starting moment is solved, and the service life of the gear pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic gear pumps, in particular to a housing structure for balancing the starting pressure of a gear pump, a gear pump and a vehicle. Background Art

[0002] Gear pumps are widely used in industry and machinery. Their main function is to transport liquids through the change in working volume between the pump cylinder and the meshing gears. The working principle of a gear pump is to use the meshing of two gears to form a suction chamber and a discharge chamber, and to achieve the suction and discharge of liquids through the rotation of the gears.

[0003] In the prior art, the design of the matching end faces of the front and rear covers of the gear pump and the shaft sleeve is crucial. The two planes of the existing shaft sleeve are parallel, and the same end face (high-pressure area and low-pressure area) is in the same plane, and the two are at the same height. The high-pressure oil enters the sealing groove of the shaft sleeve by chamfering the edge of the high-pressure area or only one oil channel to balance the pressure on both sides.

[0004] However, in the initial stage of the gear pump, the pressure distribution is uneven due to the slow entry of high-pressure oil, which in turn causes the overturning moment and early wear, which greatly reduces the life of the gear pump. In addition, the existing sleeves are mostly 8-shaped structures, and the upper and lower ends of the 8 (i.e. the outer diameter of the sleeve) form radial gaps with the tooth cavity, forming a thin oil film, which reduces the wear of the sleeve. However, the oil film is sometimes too weak, which will still damage the tooth cavity and the outer circle of the sleeve, destroying the high-pressure performance of the gear pump. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a shell structure for balancing the starting pressure of the gear pump, so as to solve the problem that the high-pressure oil enters the floating sleeve too slowly in the initial use, and cannot be balanced in time at the moment of starting, resulting in local oil film destruction between the inner end face of the sleeve and the end face of the gear. At the same time, the axial floating of the sleeve during the initial operation of the gear pump is adjusted to reduce early wear, thereby increasing the service life of the gear pump.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] A housing structure for balancing the starting pressure of a gear pump, wherein a shaft sleeve for mounting a gear is arranged inside the gear pump, an oil passage is arranged on each side of the shaft sleeve along the flow direction of the hydraulic oil, the housing structure is mounted on the outer end face of the shaft sleeve perpendicular to the flow direction of the hydraulic oil, and a balancing groove is arranged on the housing structure; the balancing groove is arranged on the inner end face of the housing structure, the inner end face is an end face that fits the shaft sleeve, and the inner end face is divided into a high-pressure area and a low-pressure area along the flow direction of the hydraulic oil, the high-pressure area and the low-pressure area are each provided with a balancing groove, and the areas of the two balancing grooves are equal, each balancing groove is connected to an oil passage, and a partial area of ​​the balancing groove covers the outer end face of the shaft sleeve.

[0008] Optionally, the shaft sleeve is composed of two circular sleeves, the two circular sleeves form an 8-shape, the outer side of the connection between the two circular sleeves is concave to form the oil channel, the balancing groove is axially symmetrical, forming three covering areas, the middle of the balancing groove is connected to the oil channel, and the three covering areas are located on the periphery of the center of the balancing groove and respectively cover the two circular sleeves and the connection between the two circular sleeves.

[0009] Optionally, the contour of the balancing groove includes a first arc, a second arc, a straight line segment, a third arc and a fourth arc connected in sequence, wherein the center of the first arc and the center of the second arc are the center of one of the circular sleeves, and the diameter of the first arc is smaller than the diameter of the second arc, the center of the third arc and the center of the fourth arc are the center of the other circular sleeve, and the diameter of the fourth arc is smaller than the diameter of the third arc.

[0010] Optionally, the housing structure is a front cover or a rear cover of a gear pump.

[0011] An embodiment of the utility model also provides a gear pump, including a pump body, a gear, a sleeve and a shell structure for balancing the starting pressure of the gear pump as described above, wherein the sleeve is installed in the pump body, the gear shaft of the gear is installed in the sleeve, and the shell structure is the front cover and rear cover of the gear pump, and the front cover and rear cover are respectively installed at both ends of the pump body.

[0012] Optionally, an oil inlet and an oil outlet are provided on both sides of the pump body, and the front cover and the rear cover are detachably connected to the pump body.

[0013] Optionally, a sealing groove is provided on the outer end surface of the shaft sleeve, the sealing groove is ear-shaped, and a sealing strip is installed in the sealing groove.

[0014] Optionally, connecting grooves are provided on both sides of the outer end surface of the sleeve, with two connecting grooves on each side, and the two connecting grooves are arranged in an eight-shaped shape, wherein the connecting groove on one side connects to the low-pressure area, and the connecting groove on the other side connects to the high-pressure area and the sealing groove.

[0015] Optionally, a chamfer is provided on the outer end surface contour of the high pressure area side of the sleeve.

[0016] An embodiment of the utility model further provides a vehicle, comprising the gear pump as described above.

[0017] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0018] 1. By opening a balance groove on the matching end surface of the pump cover structure and the sleeve, two spaces are formed inside the sleeve and the pump body gear cavity. When the gear pump starts working, the high-pressure oil will fill the sleeve and the balance groove area at the same time. The oil filled in the spaces on the left and right ends will greatly improve the balance of the sleeve, reduce the uneven pressure caused by high pressure, and enable the sleeve to reach pressure balance more quickly, reduce the wear of the sleeve in the early stage of the gear pump operation, and extend the service life of the sleeve.

[0019] 2. By opening a balancing groove in the end surface area of ​​the pump cover structure, two spaces are formed inside the shaft sleeve and the gear cavity of the pump body. After the gear pump starts working, these two areas will be filled with oil, reducing the contact area between the shaft sleeve and the gear cavity, reducing the wear of the gear pump components under high-pressure working conditions, and increasing the service life of the gear pump.

[0020] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a schematic diagram of a shaft sleeve provided by an embodiment of the utility model;

[0023] Figure 2 It is a three-dimensional schematic diagram of the front cover provided by an embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the inner end surface of the front cover provided by an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the inner end surface of the rear cover provided by an embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the coordination between the balance groove and the shaft sleeve provided in an embodiment of the utility model;

[0027] Figure 6 It is a cross-sectional view of a gear pump provided by an embodiment of the utility model;

[0028] In the figure: 1, shaft sleeve; 11, round sleeve; 12, connecting groove; 13, connection; 14, oil channel; 15, sealing strip; 16, sealing groove; 2, front cover; 21, balance groove; 211, first arc line; 212, second arc line; 213, straight line segment; 214, third arc line; 215, fourth arc line; 3, rear cover; 4, pump body;

[0029] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Terminology explanation:

[0032] Gear pump: A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. Two closed spaces are formed by two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged changes from small to large, forming a vacuum, sucking in the liquid, and the volume of the space on the side where the gears are meshing changes from large to small, squeezing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of the gear pump depends entirely on the size of the resistance at the pump outlet.

[0033] Axial floating compensation: The axial compensation device is installed inside the shaft sleeve. The high-pressure oil is sealed inside the shaft sleeve through the sealing device, and then the shaft sleeve is pushed against the gear end face to achieve axial floating compensation and ensure reliable axial sealing.

[0034] Example 1

[0035] As described in the background technology, the existing gear pumps have the following problems:

[0036] 1. The high-pressure oil enters the sealing groove of the sleeve too slowly, resulting in uneven pressure distribution at the moment of startup, causing local oil film damage between the inner end face of the sleeve and the end face of the gear.

[0037] 2. Although the 8-shaped structure of the sleeve reduces wear through the oil film, the oil film is sometimes too weak to effectively protect the gear cavity and the outer circle of the sleeve, affecting the high-pressure performance of the gear pump.

[0038] This embodiment aims at the problems existing in the shaft sleeve structure of the existing hydraulic gear pump. By designing the pump body structure (front cover or rear cover), a balancing groove is added to reduce the uneven pressure caused by high-pressure oil, improve the balancing ability and wear resistance of the shaft sleeve, and thus significantly improve the overall service life of the gear pump. By opening a mirror-symmetrical balancing groove on the mating end surface of the front cover and the rear cover, uniform filling and pressure balance of the oil are achieved, the contact area between the shaft sleeve and the gear cavity is reduced, wear is reduced, and the service life is extended.

[0039] The gear pump is provided with a shaft sleeve 1 for mounting the gear. Figure 1 As shown, an oil channel 14 is provided on each side of the shaft sleeve 1 along the flow direction of the hydraulic oil.

[0040] The housing structure is mounted on the outer end surface of the sleeve 1 perpendicular to the flow direction of the hydraulic oil, and a balancing groove 21 is provided on the housing structure. Figure 2 , Figure 3 , Figure 4 As shown, the balancing groove 21 is arranged on the inner end face of the shell structure, and the inner end face is the end face that fits with the shaft sleeve 1. The inner end face is divided into a high-pressure area and a low-pressure area along the flow direction of the hydraulic oil. The high-pressure area and the low-pressure area are each provided with a balancing groove 21, and the areas of the two balancing grooves 21 are equal. Each balancing groove 21 is connected to an oil channel 14, and a partial area of ​​the balancing groove 21 covers the outer end face of the shaft sleeve 1.

[0041] Two mirror-symmetrical balancing grooves 21 are respectively provided on the mating end surfaces of the front cover 2 and the rear cover 3. The balancing grooves 21 face the oil passages 14 on both sides of the shaft sleeve 1 and cover part of the mating surface of the shaft sleeve 1, so that the oil fills the covered area, reduces the influence of high pressure, and adjusts the pressure balance.

[0042] By designing grooves in the matching areas of the front cover 2 and the rear cover 3, two spaces are formed inside the shaft sleeve 1 and the gear cavity of the pump body. When the gear pump starts working, the high-pressure oil will fill the shaft sleeve 1 and the balance groove 21 area at the same time, reducing the uneven pressure caused by the high pressure, and forming a pressure balance at both ends of the shaft sleeve 1, so that the shaft sleeve 1 quickly reaches a balanced state, reducing the contact area between the shaft sleeve 1 and the gear cavity, reducing the wear of the gear pump components under high-pressure working conditions, and increasing the service life of the gear pump.

[0043] like Figure 1 As shown, the shaft sleeve 1 is composed of two round sleeves 11, the two round sleeves 11 form an 8-shape, and the outer side of the connection 13 of the two round sleeves 11 is concave to form the oil passage 14. Figure 2 As shown, the balancing groove 21 is an axisymmetric triangular shape, forming three coverage areas. Figure 5As shown, the middle of the balancing groove 21 is connected to the oil channel 14 , and the three covering areas are located on the periphery of the center of the balancing groove 21 and cover the two circular sleeves 11 and the connection 13 of the two circular sleeves 11 respectively.

[0044] In this embodiment, the sleeve 1 is composed of two circular sleeves 11, which are connected to form an 8-shaped structure. The joint 13 of the circular sleeves 11 is concave to form an oil channel 14 for the circulation of hydraulic oil. In order to further optimize the pressure balance, the balance groove 21 is designed to be axially symmetrical to form three covering areas.

[0045] The middle part of the balance groove 21 is connected to the oil channel 14, ensuring that the hydraulic oil can smoothly enter the balance groove 21 and be distributed on the end face of the sleeve 1. The three covering areas are respectively located at the two round sleeves 11 and the connection 13 of the round sleeves 11, ensuring that when the gear pump is started, the high-pressure oil can quickly fill these areas to form a uniform pressure distribution. This design effectively reduces the uneven pressure phenomenon when the gear pump is started, and improves the balance performance and wear resistance of the sleeve 1. Through mirror grooving, dynamic balancing, expanding the oil circulation space, and reducing the impact of high pressure, this structure can be applied to gear pumps of different rotation directions, and the versatility is guaranteed.

[0046] like Figure 3 , Figure 5 As shown, the outline of the balancing groove 21 is composed of multiple parts, specifically including a first arc 211, a second arc 212, a straight line segment 213, a third arc 214 and a fourth arc 215 connected in sequence, wherein the center of the first arc 211 and the center of the second arc 212 are the center of one of the circular sleeves 11, and the diameter of the first arc 211 is smaller than the diameter of the second arc 212, the center of the third arc 214 and the center of the fourth arc 215 are the center of the other circular sleeve 11, and the diameter of the fourth arc 215 is smaller than the diameter of the third arc 214.

[0047] Such a design facilitates processing and positioning on the one hand, and on the other hand, the balancing groove 21 can more accurately adapt to the shape of the shaft sleeve 1, so as to better adapt to the 8-shaped structure of the two round sleeves 11, so that the hydraulic oil can be quickly and evenly distributed on the end face of the shaft sleeve 1 during startup, thereby effectively reducing the uneven pressure during the startup phase and improving the performance and service life of the gear pump.

[0048] In this embodiment, the housing structure can be the front cover 2 or the rear cover 3 of the gear pump. This design provides flexible installation options. Whether it is the front cover 2 or the rear cover 3, it is necessary to ensure that its inner end surface can fit the outer end surface of the sleeve 1, and a balance groove 21 is provided to achieve pressure balance. This design enables the gear pump to achieve efficient pressure balance under different installation conditions, thereby ensuring the stable operation and long-term use of the gear pump.

[0049] In this embodiment, a balancing groove 21 is opened in the matching end surface area of ​​the front cover 2 and the rear cover 3, so that two spaces are formed inside the shaft sleeve 1 and the gear cavity of the pump body. After the oil fills the space, a balance is formed, and at the same time, the wear of the gear cavity during operation is reduced. Compared with the original oil film balance, it is more stable; the shaft sleeve 1 itself has limited design space. In this embodiment, the matching space is expanded by rationally utilizing matching parts, so that the oil pressure can be more evenly distributed, and the pressure will not gather at a fixed point to produce pressure imbalance, thereby causing early gear pump operation wear, thereby improving the service life of the shaft sleeve 1.

[0050] Example 2

[0051] Based on the housing structure of Example 1, this embodiment proposes a gear pump, such as Figure 6 As shown, it includes a pump body 4, a gear, a sleeve 1 and a housing structure. The sleeve 1 is installed in the pump body 4, and the gear shaft of the gear is installed in the sleeve 1. The housing structure is a front cover 2 and a rear cover 3 of the gear pump. The front cover 2 and the rear cover 3 are respectively installed at both ends of the pump body 4.

[0052] The pump body 4, as the main body of the entire gear pump, accommodates the gear and the shaft sleeve 1. The pump body 4 is provided with an oil inlet and an oil outlet on both sides to facilitate the inflow and outflow of hydraulic oil. The gear is installed in the shaft sleeve 1, fixed by the gear shaft, and is responsible for the delivery of hydraulic oil. The shaft sleeve 1 is installed in the pump body 4 to fix the gear. The front cover 2 and the rear cover 3 are respectively installed at the front and rear ends of the pump body 4, and are detachably connected to the pump body 4 by screws, which is convenient for maintenance and replacement, and reduces the difficulty and cost of maintenance. The balance groove 21 on the inner end surface of the front cover 2 and the rear cover 3 realizes pressure balance. This design not only improves the starting performance of the gear pump, but also ensures its stability and durability in long-term operation, reduces wear and prolongs its service life.

[0053] like Figure 1 As shown, the outer end surface of the sleeve 1 is provided with a sealing groove 16, the sealing groove 16 is ear-shaped, and a sealing strip 15 is installed in the sealing groove 16. The outer end surface of the sleeve 1 is provided with connecting grooves 12 on both sides, and two connecting grooves 12 are provided on each side. The two connecting grooves 12 are arranged in an eight-shaped shape, wherein the connecting groove 12 on one side is connected to the low-pressure area, and the connecting groove 12 on the other side is connected to the high-pressure area and the sealing groove 16. A chamfer is provided on the outer end surface profile of the high-pressure area side of the sleeve 1. Through the cooperation of the connecting groove 12, the sealing groove 16 and the chamfer, the pressure difference is reduced, ensuring that the hydraulic oil can be evenly distributed to form a good pressure balance.

[0054] Example 3

[0055] Based on the gear pump of Example 2, this embodiment provides a vehicle, in which the gear pump described in the above embodiment is provided. Since the above gear pump has the above technical effects, the technical effects of the vehicle using the gear pump please refer to the above embodiment.

[0056] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the protection scope of the utility model.

Claims

1. A housing structure for balancing the starting pressure of a gear pump, wherein a shaft sleeve for mounting a gear is provided inside the gear pump, and an oil channel is provided on each side of the shaft sleeve along the flow direction of the hydraulic oil, characterized in that: The housing structure is mounted on the outer end surface of the sleeve perpendicular to the flow direction of the hydraulic oil, and a balancing groove is provided on the housing structure; The balancing groove is arranged on the inner end surface of the shell structure, and the inner end surface is the end surface that fits with the sleeve. The inner end surface is divided into a high-pressure area and a low-pressure area along the flow direction of the hydraulic oil. The high-pressure area and the low-pressure area are each provided with a balancing groove, and the areas of the two balancing grooves are equal. Each balancing groove is connected to an oil channel, and a partial area of ​​the balancing groove covers the outer end surface of the sleeve.

2. The housing structure for balancing the starting pressure of a gear pump according to claim 1, characterized in that: The shaft sleeve is composed of two circular sleeves, and the two circular sleeves form an 8 shape. The outer side of the connection between the two circular sleeves is concave to form the oil channel. The balancing groove is axially symmetrical and forms three covering areas. The middle of the balancing groove is connected to the oil channel. The three covering areas are located on the periphery of the center of the balancing groove and respectively cover the two circular sleeves and the connection between the two circular sleeves.

3. The housing structure for balancing the starting pressure of a gear pump as claimed in claim 2, characterized in that: The profile of the balancing groove includes a first arc, a second arc, a straight line segment, a third arc and a fourth arc connected in sequence, wherein the center of the first arc and the center of the second arc are the center of one of the circular sleeves, and the diameter of the first arc is smaller than the diameter of the second arc, the center of the third arc and the center of the fourth arc are the center of the other circular sleeve, and the diameter of the fourth arc is smaller than the diameter of the third arc.

4. The housing structure for balancing the starting pressure of a gear pump according to claim 1, characterized in that: The housing structure is a front cover or a rear cover of the gear pump.

5. A gear pump, characterized in that: It includes a pump body, a gear, a sleeve and a shell structure for balancing the starting pressure of a gear pump as described in any one of claims 1 to 3, wherein the sleeve is installed in the pump body, the gear shaft of the gear is installed in the sleeve, and the shell structure is the front cover and rear cover of the gear pump, and the front cover and rear cover are respectively installed at both ends of the pump body.

6. The gear pump according to claim 5, characterized in that An oil inlet and an oil outlet are arranged on both sides of the pump body, and the front cover and the rear cover are both detachably connected to the pump body.

7. The gear pump according to claim 5, characterized in that The outer end surface of the shaft sleeve is provided with a sealing groove, the sealing groove is ear-shaped, and a sealing strip is installed in the sealing groove.

8. The gear pump according to claim 7, characterized in that The outer end surface of the sleeve is provided with connecting grooves on both sides, with two connecting grooves on each side, and the two connecting grooves are arranged in an eight-shaped shape, wherein the connecting groove on one side connects the low-pressure area, and the connecting groove on the other side connects the high-pressure area and the sealing groove.

9. The gear pump according to claim 5, characterized in that A chamfer is arranged on the outer end surface profile of the shaft sleeve at the high pressure area side.

10. A vehicle, characterized in that: Comprising a gear pump as described in any one of claims 5-9.

Images