Hydraulic high-pressure gear pump with single side plate structure

Abstract

The utility model relates to a hydraulic high-pressure gear pump with a single side plate structure, and belongs to the technical field of gear pumps. Comprising a front cover, a pump body, a rear cover, a driving shaft, a driven shaft, a driving gear, a driven gear and a single-side plate, the pump body is of a cylindrical structure with openings in the front end and the rear end, the driving shaft and the driven shaft which are vertically distributed are rotationally arranged in the pump body, the middle of the outer side of the driving shaft is fixedly sleeved with the driving gear, and the middle of the outer side of the driven shaft is fixedly sleeved with the driven gear; the driving gear and the driven gear are both located in the pump body and meshed with each other. A front cover is arranged at an opening in the front end of the pump body, a rear cover is arranged at an opening in the rear end of the pump body, a single-side plate is arranged on the inner side of the opening in the front end of the pump body and located between the front end face of the driving gear and the front end face of the driven gear and the rear end face of the front cover, and a 3-shaped sealing gasket is arranged between the single-side plate and the rear end face of the front cover; the problem that the axial size of a traditional hydraulic gear pump is large is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear pumps, and in particular relates to a hydraulic high-pressure gear pump with a single-side plate structure. Background Art

[0002] The most basic form of a gear pump is two gears of the same size meshing and rotating in a tightly fitting housing. The interior of the housing is shaped like an "8" and the two gears are installed inside. The outer diameter and both sides of the gears fit tightly with the housing. The material from the extruder enters the space between the two gears at the suction port and fills this space. As the teeth rotate, they move along the housing and are finally discharged when the two teeth mesh.

[0003] The traditional hydraulic gear pump is composed of a front cover, a pump body, a rear cover, a driving gear, a driven gear, a connecting sleeve or a transmission shaft, a shaft sleeve or a side plate, etc. This structure has a large axial dimension, many parts, and high cost, and is not suitable for installation in a compact space. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and provides a hydraulic high-pressure gear pump with a single-side plate structure, thereby solving the problem that the axial size of a traditional hydraulic gear pump is relatively large.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0006] A hydraulic high-pressure gear pump with a single-side plate structure comprises a front cover, a pump body, a rear cover, a driving shaft, a driven shaft, a driving gear, a driven gear and a single-side plate. The pump body is a cylindrical structure with openings at both ends. A driving shaft and a driven shaft are rotatably arranged inside the pump body and are distributed up and down. A driving gear is fixedly sleeved in the middle of the outer side of the driving shaft, and a driven gear is fixedly sleeved in the middle of the outer side of the driven shaft. Both the driving gear and the driven gear are located inside the pump body and mesh with each other. A front cover is arranged at the front end opening of the pump body, a rear cover is arranged at the rear end opening of the pump body, a single-side plate is arranged inside the front end opening of the pump body, the single-side plate is located between the front end faces of the driving gear and the driven gear and the rear end face of the front cover, and a "3"-shaped sealing gasket is arranged between the single-side plate and the rear end face of the front cover.

[0007] Furthermore, the front cover is fixedly connected to the pump body by a plurality of screws, and the front end opening of the pump body is closed by the front cover; the rear cover is fixedly connected to the pump body by a plurality of screws, and the rear end opening of the pump body is closed by the rear cover.

[0008] Furthermore, sealing rings are provided on the contact surface between the front cover and the pump body and on the contact surface between the rear cover and the pump body.

[0009] Furthermore, a circle of middle positioning holes is provided on the pump body, and the middle positioning holes are horizontally connected along the front-to-back direction; a circle of front positioning holes is provided on the rear end surface of the front cover, and a circle of rear positioning holes is provided on the front end surface of the rear cover, and the number of the front positioning holes, the middle positioning holes, and the rear positioning holes are equal and correspond one to one; the same positioning pin is inserted into the corresponding front positioning holes, the middle positioning holes, and the rear positioning holes, thereby playing a positioning role in the installation of the front cover, the pump body, and the rear cover.

[0010] Furthermore, a through hole is provided on the front cover, which passes through the through hole on the front cover and extends to the outside of the front cover; an external spline is provided at the front end of the extended driving shaft, and the driving shaft is driven to rotate by the external spline; a skeleton oil seal is provided at the front end opening of the through hole, and the skeleton oil seal is fixed to the front end opening of the through hole by a retaining ring; the driving shaft and the inner wall of the through hole are rotatably connected by a sliding bearing.

[0011] Furthermore, a front lower side fixing groove is provided on the lower side of the rear end surface of the front cover, the front end of the driven shaft is inserted into the interior of the front lower side fixing groove, and the driven shaft and the inner wall of the front lower side fixing groove are rotationally connected via a sliding bearing; a rear upper side fixing groove is provided on the upper side of the front end surface of the rear cover, the rear end of the driving shaft is inserted into the interior of the rear upper side fixing groove, and the driving shaft and the inner wall of the rear upper side fixing groove are rotationally connected via a sliding bearing; a rear lower side fixing groove is provided on the lower side of the front end surface of the rear cover, the rear end of the driven shaft is inserted into the interior of the rear lower side fixing groove, and the driven shaft and the inner wall of the rear lower side fixing groove are rotationally connected via a sliding bearing.

[0012] Furthermore, the rear end faces of the driving gear and the driven gear are in contact with the front end face of the rear cover.

[0013] Furthermore, the single-side plate is sleeved on the outer sides of the driving shaft and the driven shaft, the front end surface of the single-side plate contacts the rear end surface of the front cover, and the rear end surface of the single-side plate contacts the driving gear and the driven gear.

[0014] Furthermore, a "3"-shaped sealing groove is arranged on one end surface of the single-side plate close to the front cover, and the sealing gasket is arranged inside the sealing groove, and the sealing gasket is tightly pressed between the single-side plate and the rear end surface of the front cover.

[0015] Furthermore, an oil suction port and an oil discharge port are respectively arranged in the middle of the left and right sides of the pump body, and the oil suction port and the oil discharge port are both connected with the interior of the pump body. The oil suction port is connected with the oil suction chamber inside the pump body, and the oil discharge port is connected with the oil discharge chamber inside the pump body; an oil passing groove is arranged on the left side of the rear end face of the front cover and the front end face of the rear cover, the oil passing groove on the front cover is connected with the through hole on the front cover and the interior of the front lower side fixed groove through an inclined hole, and the oil passing groove on the rear cover is connected with the rear upper side fixed groove and the interior of the rear lower side fixed groove on the rear cover through an inclined hole; an avoidance groove is arranged in the middle of the left side of the single-side plate, the avoidance groove is located at the left side opening of the "3"-shaped sealing gasket, and the avoidance groove is located between the oil passing grooves on the front cover and the rear cover.

[0016] The beneficial effects of the utility model compared with the prior art are:

[0017] The utility model provides a hydraulic high-pressure gear pump with a single-side plate structure, which adopts a single-side plate unidirectional floating structure, and the other side plate is integrated with the rear cover, eliminating the rear side plate and corresponding seals, thereby reducing production costs; the optimization of the unloading groove structure not only improves efficiency, but also maintains smooth oil flow, reduces noise, and improves the life and reliability of the pump; the lubrication system of the sliding bearing lubricates with low-pressure oil instead of high-pressure oil, thereby improving the volumetric efficiency of the gear pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings:

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

[0020] Figure 2 yes Figure 1 AA section view in;

[0021] Figure 3 It is the front view of the back cover;

[0022] Figure 4 It is the rear view of the front cover;

[0023] Figure 5 yes Figure 4 BB section view in;

[0024] Figure 6 yes Figure 4 CC section view in;

[0025] Figure 7 It is the front view of a single side panel;

[0026] Among them, 1 is the pump body, 2 is the front cover, 3 is the rear cover, 4 is the driving shaft, 5 is the driven shaft, 6 is the driving gear, 7 is the driven gear, 8 is the sealing ring, 9 is the positioning pin, 10 is the external spline, 11 is the skeleton oil seal, 12 is the retaining ring, 13 is the sliding bearing, 14 is the single side plate, 15 is the sealing gasket, 16 is the oil groove, 17 is the inclined hole, and 18 is the avoidance groove. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0028] like Figure 1 As shown in FIG. 7 , the utility model provides a hydraulic high-pressure gear pump with a single-side plate structure, comprising a front cover 2, a pump body 1, a rear cover 3, a driving shaft 4, a driven shaft 5, a driving gear 6, a driven gear 7, and a single-side plate 14.

[0029] The pump body 1 is a cylindrical structure with openings at both ends. A driving shaft 4 and a driven shaft 5 are rotatably arranged inside the pump body 1 and are distributed vertically. The driving shaft 4 and the driven shaft 5 are both arranged horizontally along the front-to-back direction. A driving gear 6 is fixedly sleeved in the middle of the outer side of the driving shaft 4, and a driven gear 7 is fixedly sleeved in the middle of the outer side of the driven shaft 5. The driving gear 6 and the driven gear 7 are both located inside the pump body 1 and mesh with each other.

[0030] A front cover 2 is provided at the front opening of the pump body 1, and the front cover 2 is fixedly connected to the pump body 1 by a plurality of screws, and the front opening of the pump body 1 is closed by the front cover 2. A rear cover 3 is provided at the rear opening of the pump body 1, and the rear cover 3 is fixedly connected to the pump body 1 by a plurality of screws, and the rear opening of the pump body 1 is closed by the rear cover 3.

[0031] A sealing ring 8 is provided on the contact surface between the front cover 2 and the pump body 1 and on the contact surface between the rear cover 3 and the pump body 1 , and the sealing ring 8 is used to ensure the sealing performance at the contact surface.

[0032] A circle of middle positioning holes is provided on the pump body 1, and the middle positioning holes are horizontally penetrated along the front-to-back direction. A circle of front positioning holes is provided on the rear end face of the front cover 2, and a circle of rear positioning holes is provided on the front end face of the rear cover 3. The number of front positioning holes, middle positioning holes, and rear positioning holes is equal and one-to-one corresponding. The same positioning pin 9 is inserted into the corresponding front positioning holes, middle positioning holes, and rear positioning holes, so as to play a positioning role in the installation of the front cover 2, the pump body 1, and the rear cover 3.

[0033] A through hole is provided on the front cover 2, and the front end of the driving shaft 4 passes through the through hole on the front cover 2 and extends to the outside of the front cover 2. An external spline 10 is provided at the front end of the driving shaft 4, and the driving shaft 4 is driven to rotate by the external spline 10. A skeleton oil seal 11 is provided at the front end opening of the through hole, and the skeleton oil seal 11 is fixed to the front end opening of the through hole by a retaining ring 12. The driving shaft 4 is rotatably connected to the inner wall of the through hole by a sliding bearing 13.

[0034] A front lower side fixing groove is provided at the lower side of the rear end face of the front cover 2, the front end of the driven shaft 5 is inserted into the interior of the front lower side fixing groove, and the driven shaft 5 is rotationally connected to the inner wall of the front lower side fixing groove via a sliding bearing 13. A rear upper side fixing groove is provided at the upper side of the front end face of the rear cover 3, the rear end of the driving shaft 4 is inserted into the interior of the rear upper side fixing groove, and the driving shaft 4 is rotationally connected to the inner wall of the rear upper side fixing groove via a sliding bearing 13. A rear lower side fixing groove is provided at the lower side of the front end face of the rear cover 3, the rear end of the driven shaft 5 is inserted into the interior of the rear lower side fixing groove, and the driven shaft 5 is rotationally connected to the inner wall of the rear lower side fixing groove via a sliding bearing 13.

[0035] The rear end faces of the driving gear 6 and the driven gear 7 are in contact with the front end face of the rear cover 3 .

[0036] A single-side plate 14 is provided on the inner side of the front end opening of the pump body 1. The single-side plate 14 is located between the front end faces of the driving gear 6 and the driven gear 7 and the rear end face of the front cover 2. The single-side plate 14 is sleeved on the outer side of the driving shaft 4 and the driven shaft 5. The front end face of the single-side plate 14 contacts the rear end face of the front cover 2, and the rear end face of the single-side plate 14 contacts the driving gear 6 and the driven gear 7.

[0037] A "3"-shaped sealing groove is provided on one end face of the single-side plate 14 close to the front cover 2 , and a "3"-shaped sealing gasket 15 is provided inside the sealing groove. The sealing gasket 15 is tightly crimped between the single-side plate 14 and the rear end face of the front cover 2 .

[0038] An oil suction port and an oil discharge port are respectively provided in the middle of the left and right sides of the pump body 1. The oil suction port is connected to the oil suction chamber inside the pump body 1, and the oil discharge port is connected to the oil discharge chamber inside the pump body 1. An oil passage groove 16 is provided on the left side of the rear end face of the front cover 2 and the front end face of the rear cover 3. The oil passage groove 16 on the front cover 2 is connected to the through hole on the front cover 2 and the inside of the front lower side fixing groove through the inclined hole 17. The oil passage groove 16 on the rear cover 3 is connected to the rear upper side fixing groove and the inside of the rear lower side fixing groove on the rear cover 3 through the inclined hole 17. An avoidance groove 18 is provided in the middle of the left side of the single-side plate 14. The avoidance groove 18 is located at the left opening of the "3"-shaped sealing gasket 15, and the avoidance groove 18 is located between the oil passage grooves 16 on the front cover 2 and the rear cover 3.

[0039] The working principle of the utility model is:

[0040] The driving shaft 4 is driven to rotate through the external spline 10, and the driving shaft 4 drives the driving gear 6 to rotate, and the driving gear 6 drives the driven gear 7 to rotate. When the driving gear 6 and the driven gear 7 rotate, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum, sucking the liquid from the pipeline at the oil suction port, and the volume of the space on the gear meshing side changes from large to small, squeezing the liquid into the pipeline at the oil discharge port. The suction chamber and the discharge chamber are separated by the meshing line of the driving gear 6 and the driven gear 7.

[0041] A part of the low-pressure oil in the oil suction chamber inside the pump body 1 directly enters the oil groove 16 on the rear cover 3, and the other part enters the oil groove 16 of the front cover 2 through the avoidance groove 18 on the single side plate 14. The low-pressure oil inside the oil groove 16 of the front cover 2 enters the through hole and the front lower side fixed groove of the front cover 2 through the inclined hole 17, thereby lubricating the sliding bearing 13 inside the through hole and the front lower side fixed groove of the front cover 2. The low-pressure oil inside the oil groove 16 of the rear cover 3 enters the rear upper side fixed groove and the rear lower side fixed groove of the rear cover 3 through the inclined hole 17, thereby lubricating the sliding bearing 13 inside the rear upper side fixed groove and the rear lower side fixed groove of the rear cover 3. The volumetric efficiency of the gear pump is improved by lubricating with low-pressure oil instead of high-pressure oil.

[0042] The gear pump proposes a single-side plate 14 structure solution, which can reduce the production cost of the gear pump as much as possible while ensuring that the external connection size of the main engine factory remains unchanged. Therefore, the single-side plate 14 unidirectional floating structure can not only save the number of parts and reduce the complexity of the structure, but also shorten the axial size of the gear element, save costs, improve the one-time qualified rate of assembly, and have high volumetric efficiency; secondly, the single-side plate 14 directly cooperates with the gear, the axial clearance is easy to control, and the radial can float, which effectively improves the assembly efficiency. The assembly structure of the sleeve and the pump body 1 is changed from double-sided sleeve floating to single-sided sleeve floating, which makes the assembly clearance also change from double-sided to single-sided, and the clearance is easier to measure and match, while reducing the cost of two sets of side plates. The driving gear 6 and the driven gear 7 are linked, and the floating effect has a good compensation for gear deformation, reduces and delays the deformation of the skeleton oil seal 11 caused by the gear coaxiality tolerance, thereby preventing oil pump leakage and improving the reliability of the oil pump.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A single-side plate structure hydraulic high-pressure gear pump, characterized in that: The pump comprises a front cover (2), a pump body (1), a rear cover (3), a driving shaft (4), a driven shaft (5), a driving gear (6), a driven gear (7), and a single side plate (14). The pump body (1) is a cylindrical structure with openings at both ends. A driving shaft (4) and a driven shaft (5) are rotatably arranged inside the pump body (1) and are distributed vertically. A driving gear (6) is fixedly sleeved on the middle part of the outer side of the driving shaft (4). A driven gear (7) is fixedly sleeved on the middle part of the outer side of the driven shaft (5). The driving gear (6) and the driven gear (7) are located inside the pump body (1) and mesh with each other; a front cover (2) is provided at the front end opening of the pump body (1), a rear cover (3) is provided at the rear end opening of the pump body (1), a single side plate (14) is provided inside the front end opening of the pump body (1), the single side plate (14) is located between the front end faces of the driving gear (6) and the driven gear (7) and the rear end face of the front cover (2), and a "3"-shaped sealing gasket (15) is provided between the single side plate (14) and the rear end face of the front cover (2).

2. A single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: The front cover (2) is fixedly connected to the pump body (1) by means of a plurality of screws, and the front end opening of the pump body (1) is closed by means of the front cover (2); the rear cover (3) is fixedly connected to the pump body (1) by means of a plurality of screws, and the rear end opening of the pump body (1) is closed by means of the rear cover (3).

3. A single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: A sealing ring (8) is provided on the contact surface between the front cover (2) and the pump body (1) and on the contact surface between the rear cover (3) and the pump body (1).

4. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: A circle of middle positioning holes is provided on the pump body (1), and the middle positioning holes are horizontally connected along the front-to-back direction; a circle of front positioning holes is provided on the rear end surface of the front cover (2), and a circle of rear positioning holes is provided on the front end surface of the rear cover (3); the number of the front positioning holes, the middle positioning holes, and the rear positioning holes is equal and corresponds to each other; the same positioning pin (9) is inserted into the corresponding front positioning holes, the middle positioning holes, and the rear positioning holes.

5. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: A through hole is provided on the front cover (2) and passes through the through hole on the front cover (2) to extend outward from the front cover (2); an external spline (10) is provided at the extended front end of the driving shaft (4), and the driving shaft (4) is driven to rotate by the external spline (10); a skeleton oil seal (11) is provided at the front end opening of the through hole, and the skeleton oil seal (11) is fixed to the front end opening of the through hole by a retaining ring (12); and the driving shaft (4) is rotationally connected to the inner wall of the through hole by a sliding bearing (13).

6. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: A front lower side fixing groove is provided on the lower side of the rear end surface of the front cover (2), the front end of the driven shaft (5) is inserted into the interior of the front lower side fixing groove, and the driven shaft (5) and the inner wall of the front lower side fixing groove are rotatably connected via a sliding bearing (13); a rear upper side fixing groove is provided on the upper side of the front end surface of the rear cover (3), the rear end of the driving shaft (4) is inserted into the interior of the rear upper side fixing groove, and the driving shaft (4) and the inner wall of the rear upper side fixing groove are rotatably connected via a sliding bearing (13); a rear lower side fixing groove is provided on the lower side of the front end surface of the rear cover (3), the rear end of the driven shaft (5) is inserted into the interior of the rear lower side fixing groove, and the driven shaft (5) and the inner wall of the rear lower side fixing groove are rotatably connected via a sliding bearing (13).

7. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: The rear end faces of the driving gear (6) and the driven gear (7) are in contact with the front end face of the rear cover (3).

8. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: The single-side plate (14) is sleeved on the outer sides of the driving shaft (4) and the driven shaft (5), the front end surface of the single-side plate (14) is in contact with the rear end surface of the front cover (2), and the rear end surface of the single-side plate (14) is in contact with the driving gear (6) and the driven gear (7).

9. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: A "3"-shaped sealing groove is provided on one end surface of the single-side plate (14) close to the front cover (2), and the sealing gasket (15) is provided inside the sealing groove. The sealing gasket (15) is tightly pressed between the single-side plate (14) and the rear end surface of the front cover (2).

10. The single-side plate structure hydraulic high-pressure gear pump according to claim 1, characterized in that: An oil suction port and an oil discharge port are respectively arranged in the middle of the left and right sides of the pump body (1). The oil suction port and the oil discharge port are both connected to the inside of the pump body (1). The oil suction port is connected to the oil suction chamber inside the pump body (1), and the oil discharge port is connected to the oil discharge chamber inside the pump body (1). An oil passage groove (16) is arranged on the left side of the rear end surface of the front cover (2) and the front end surface of the rear cover (3). The oil passage groove (16) on the front cover (2) is connected to the oil passage groove (16) on the front cover (2) through the inclined hole (17). The hole and the interior of the front lower fixing groove are connected, and the oil passage groove (16) on the rear cover (3) is connected with the interior of the rear upper fixing groove and the rear lower fixing groove on the rear cover (3) through the inclined hole (17); an avoidance groove (18) is provided in the middle of the left side of the single-side plate (14), the avoidance groove (18) is located at the left opening of the "3"-shaped sealing gasket (15), and the avoidance groove (18) is located between the oil passage grooves (16) on the front cover (2) and the rear cover (3).

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