CN-118128747-B - Efficient oil-absorbing external gear pump

CN118128747BCN 118128747 BCN118128747 BCN 118128747BCN-118128747-B

Abstract

The utility model provides a high-efficient external gear pump that absorbs oil, realize the location through locating pin (2) between front end housing (1) and the pump body (3), connect through bolt (13), and realize end face seal through sealing washer (11), be equipped with slide bearing (8) in the axle sleeve and the floating axle sleeve mounting hole of pump body (3), support driving gear axle (9) jointly, driven gear axle (10), the sealed face (7-5) of floating curb plate (7) are laminated with the gear terminal surface, upper fan-shaped groove (4-1) and lower fan-shaped groove (12-2) intercommunication and with the axial distributing groove (7-2) of floating curb plate (7) align, radial oil distributing groove (16) are constituteed to axial oil absorption resistance plate (7-1) in the floating curb plate (7) and radial oil absorption resistance plate (3-2) in the pump body (3), radial oil distributing groove (16) are out of mesh region alignment with the gear, driving shaft sleeve (4), driven shaft sleeve (12) and oil guide plane (3-3) of pump body (3) form oil guide chamber (17), communicate oil absorption chamber (3-1) in the pump body (3) with the circular arc (1-1) of front end housing (1).

Inventors

JI HONG
TANG RONGFU
CHEN JIQING
SUN FEI
YANG SHENGQING
WANG SUYAN
DAI PENGYUN
LI QINGHUA
LI YANZE

Assignees

兰州理工大学
广西柳工机械股份有限公司

Dates

Publication Date: 20260508
Application Date: 20240506

Claims (6)

1. An efficient oil-absorbing external gear pump comprises a front end cover (1), a locating pin (2), a pump body (3), a driving shaft sleeve (4), a polytetrafluoroethylene seal (5), a rubber seal (6), a floating side plate (7), a sliding bearing (8), a driving gear shaft (9), a driven gear shaft (10), a sealing ring (11), a driven shaft sleeve (12), a bolt (13), a lip-shaped sealing ring (14) and a hole circlip (15), and is characterized in that an oil-absorbing cavity (3-1) and a radial oil-absorbing baffle (3-2) are arranged on the pump body (3), the radial oil-absorbing baffle (3-2) is arc-shaped, the radial oil-absorbing baffle (3-2) has a width equal to or larger than the tooth width of a gear, is integrated with the pump cavity (3-10), the middle of the radial oil-absorbing baffle is separated by a rectangular section and is in an eight shape and symmetrical about a central plane, and an upper arc-shaped surface (3-2-1) and a lower arc-shaped surface (3-2-2) are arranged, wherein the radius of the upper arc-shaped surface (3-1) is larger than or equal to the tooth top radius of the gear; the floating side plate (7) is provided with an axial oil absorption baffle plate (7-1), an axial distributing groove (7-2), an oil absorption unloading groove (7-3), an oil discharge unloading groove (7-4) and a sealing surface (7-5); the driving shaft sleeve (4) is provided with a main fan-shaped groove (4-1), and the main fan-shaped groove (4-1) is communicated with the axial distributing groove (7-2); the driven shaft sleeve (12) is provided with a slave fan-shaped groove (12-2); The front end cover (1) is positioned with the pump body (3) through a positioning pin (2), the front end cover is connected with the pump body (3) through a bolt (13) and is sealed through a sealing ring (11), sliding bearings (8) are arranged in the shaft sleeve and a floating shaft sleeve mounting hole of the pump body (3) and jointly support a driving gear shaft (9) and a driven gear shaft (10), a sealing surface (7-5) of a floating side plate (7) is attached to the end face of the gear, a rubber seal (6) and a polytetrafluoroethylene seal (5) are arranged on the back, an axial distributing groove (7-2) is aligned with an irregular polygon (3-1A) of the oil absorbing cavity (3-1), a main positioning plane (4-2) of the driving shaft sleeve (4) is installed opposite to a slave positioning plane (12-1) of the driven shaft sleeve (12), the main fan-shaped groove (4-1) is mutually communicated with the slave fan-shaped groove (12-2) and aligned with an axial distributing groove (7-2) of the floating side plate (7), the axial distributing groove (7-1) of the floating side plate (7) is aligned with the radial distributing groove, the axial distributing groove (3-2) of the floating side plate (7) is aligned with the oil absorbing groove (3-2), the axial distributing groove (16) of the pump body (3-1) in the pump body (3) is aligned with the radial distributing groove (16), and the oil groove (16) is separated from the radial distributing groove (16) of the driving shaft sleeve (4) from the driving shaft sleeve (4) The driven shaft sleeve (12) and the oil guide plane (3-3) of the pump body (3) form an oil guide cavity (17), and the oil suction cavity (3-1) in the pump body (3) is communicated with the right circular arc groove (1-3) of the front end cover (1).
2. The efficient oil-absorbing external gear pump according to claim 1 is characterized in that an oil guide plane (3-3), an axial positioning surface (3-4), a sealing groove (3-5), an oil discharging cavity (3-6), a communicating groove (3-7), a pump body oil storage hole (3-8), a bearing mounting hole (3-9) and a pump cavity (3-10) are arranged on a pump body (3), wherein the oil absorbing cavity (3-1) is parallel to the axis of a gear shaft, the inlet is circular, and the position from the inlet to the axial positioning surface (3-4) is an irregular polygon (3-1A); The irregular polygon (3-1A) is provided with a transverse line (3-1A-1), two axisymmetric distribution circular arcs (3-1A-2), two axisymmetric distribution vertical lines (3-1A-3) and a distribution semicircular line (3-1A-4), the radius of the distribution circular arc (3-1A-2) is the radius of a gear tooth root circle and is intersected with the transverse line (3-1A-1), the distribution vertical line (3-1A-3) is intersected with the distribution circular arc (3-1A-2), and the distribution semicircular line (3-1A-4) is tangent with the distribution vertical line (3-1A-3).
3. The external gear pump with high-efficiency oil absorption according to claim 1, wherein the axial oil absorption baffle (7-1) is provided with two axisymmetric lower distribution circular arc surfaces (7-1-1), a lower distribution transverse surface (7-1-2), a transverse surface (7-1-3), two axisymmetric lower circular arc surfaces (7-1-4), an outer positioning surface (7-1-5) and two axisymmetric installation circular arc surfaces (7-1-6), wherein the radius of the lower distribution circular arc surface (7-1-1) is the radius of a gear base circular arc and is aligned with a distribution circular arc line (3-1A-2), the lower distribution transverse surface (7-1-2) is positioned outside an oil absorption unloading groove (7-3), the radius of the lower circular arc surface (7-1-4) is equal to the radius of the lower circular arc surface (3-2-2) of the radial oil absorption baffle (3-2) and is aligned with the lower circular arc surface, the outer positioning surface (7-1-5) is flush with a sealing surface (7-5) or is in a concentric circular arc surface (7-1-6) and is in a same installation distance from the installation circular arc surface (7-1-6-1) and is in a same form as the installation circular arc surface (6-1-2); The axial flow distribution groove (7-2) consists of an upper flow distribution transverse surface (7-2-1), two upper flow distribution circular arc surfaces (7-2-2) which are axisymmetric, two upper flow distribution vertical surfaces (7-2-3) which are axisymmetric, two lower flow distribution circular arc surfaces (7-1-1) which are axisymmetric and an axial oil absorption resistance plate (7-1) and a lower flow distribution transverse surface (7-1-2), wherein the upper flow distribution transverse surface (7-2-1) is arranged in the oil absorption unloading groove and is aligned with a flow distribution transverse line (3-1A-1), the upper flow distribution circular arc surfaces (7-2-2) are equal in radius with the root circle of the gear teeth and are aligned with the flow distribution circular arc lines (3-1A-2), and the upper flow distribution vertical surfaces (7-2-3) are aligned with the flow distribution vertical lines (3-1A-3); the axial oil absorption baffle (7-1) and the axial distributing groove (7-2) are both pi-shaped; The surface of the sealing surface (7-5) is plated with a wear-resistant coating.
4. The external gear pump for efficiently absorbing oil according to claim 1, which is characterized in that a main positioning plane (4-2), a main bearing mounting hole (4-3) and a main boss (4-4) are arranged on a main driving shaft sleeve (4); The main fan-shaped groove (4-1) is provided with a main vertical surface (4-1-1), a main circular arc surface (4-1-2) and a main transverse surface (4-1-3), the main vertical surface (4-1-1) is aligned with the upper flow distribution vertical surface (7-2-3), the main circular arc surface (4-1-2) is equal to the radius of the tooth root and is aligned with the upper flow distribution circular arc surface (7-2-2), and the main transverse surface (4-1-3) is aligned with the upper flow distribution transverse surface (7-2-1).
5. The external gear pump for efficiently absorbing oil according to claim 1, wherein the driven shaft sleeve (12) is provided with a slave positioning plane (12-1), a slave bearing mounting hole (12-3) and a slave boss (12-4); The secondary fan-shaped groove (12-2) is communicated with the axial distributing groove (7-2), and is provided with a secondary transverse surface (12-2-1), a secondary circular arc surface (12-2-2) and a secondary vertical surface (12-2-3), wherein the secondary transverse surface (12-2-1) is aligned with the upper distributing transverse surface (7-2-1), the secondary circular arc surface (12-2-2) is equal to the root circular radius and is aligned with the upper distributing circular arc surface (7-2-2), and the secondary vertical surface (12-2-3) is aligned with the upper distributing vertical surface (7-2-3).
6. The external gear pump for efficiently absorbing oil according to claim 1, wherein the front end cover (1) is provided with an upper transition hole (1-1), a left circular arc groove (1-2), a right circular arc groove (1-3), a lower transition hole (1-4) and an end cover oil storage hole (1-5), and the left circular arc groove (1-2) and the right circular arc groove (1-3) are communicated with the upper transition hole (1-1) and the lower transition hole (1-4).

Description

Efficient oil-absorbing external gear pump Technical Field The invention relates to the technical field of external gear pumps, in particular to an external gear pump which works under the working condition of high rotation speed. Background The external gear pump is often used as a power source of a hydraulic system of a walking machine due to the simple structure and low manufacturing cost, and the use efficiency of the external gear pump is critical to the energy use efficiency of a fluid transmission system. The volumetric efficiency loss of the external gear pump can be generally attributed to leakage loss and oil absorption efficiency loss, wherein the oil absorption efficiency loss can be divided into two types, namely, the partial vortex is generated by influencing the flow of oil through the internal structure of the runner, so that the oil absorption resistance of the gear is increased, and the oil is thrown out of the tooth cavity under the action of centrifugal force when the external gear pump is disengaged, so that the liquid filling rate in the tooth cavity is reduced. At present, two methods for improving the oil absorption efficiency of the gear exist, one is to optimize the flow channel structure of the diffusion section of the oil absorption cavity of the pump body, and reduce the oil absorption flow resistance by reducing local vortex in the flow process. Its disadvantage is that it cannot solve the problem of oil absorption resistance caused by centrifugal force of gears. The other is that the oil suction supercharging device is arranged in front of the hydraulic pump, and the inlet pressure of the gear pump is increased through the oil suction supercharging device, so that the tooth cavity filling rate is increased. Its disadvantages are that the tandem structure is limited by the installation form, the manufacturing cost is increased, and the oil absorption resistance of the gear pump cannot be eliminated. Disclosure of Invention The invention aims to provide an external gear pump capable of efficiently absorbing oil. The invention relates to an efficient oil-absorbing external gear pump which comprises a front end cover 1, a positioning pin 2, a pump body 3, a driving shaft sleeve 4, a polytetrafluoroethylene seal 5, a rubber seal 6, a floating side plate 7, a sliding bearing 8, a driving gear shaft 9, a driven gear shaft 10, a sealing ring 11, a driven shaft sleeve 12, a bolt 13, a lip seal ring 14 and a hole elastic retainer 15, wherein the front end cover 1 and the pump body 3 are positioned through the positioning pin 2 and are connected through the bolt 13, end face sealing is realized through the sealing ring 11, the sliding bearing 8 is arranged in the sleeve and a floating sleeve mounting hole of the pump body 3 and jointly support the driving gear shaft 9 and the driven gear shaft 10, a sealing surface 7-5 of the floating side plate 7 is attached to the end face of a gear, the back is provided with the rubber seal 6 and the polytetrafluoroethylene seal 5, a main positioning plane 4-2 of the driving shaft sleeve 4 is arranged opposite to a slave positioning plane 12-1 of the driven shaft sleeve 12, a sector groove 4-1 is mutually communicated with a slave sector groove 12-2 and is aligned with an axial distributing groove 7-2 of the floating side plate 7, the floating side plate 7-7 is aligned with an axial distributing groove 7-2 of the slave side plate 7-2, the radial distributing groove 3-1 is formed in the pump body 3-1 and is aligned with a radial distributing groove 16 of the pump body 3-1, and the radial distributing groove 3-1 is formed in the radial direction is aligned with the radial distributing groove 3-1 and the pump body 3-1, and the radial side plate 3-1 is aligned with the radial distributing groove 3-1 is aligned with the radial groove 3-1, and the radial 3-1 is formed in the radial 3-distributing groove 3 is an annular cavity 3, and the pump 3 is an annular cavity 3 is an the radial cavity is an the pump. The axial oil suction baffle plate has the advantages that oil in the tooth cavity is prevented from being thrown out under the action of centrifugal force by the radial oil suction baffle plate 3-2 of the pump body 3 and the axial oil suction baffle plate 7-1 of the floating side plate 7, oil suction capacity of the tooth root part of the gear is enhanced by the axial distributing groove 7-2, oil thrown out of the tooth root part is supplemented, and flow resistance in the oil flowing process is greatly reduced due to the axial oil suction design of the oil suction cavity 3-1 and the scanning mixing flow passage design from a circular shape to an irregular polygon 3-1A. The invention has the advantages of convenient installation, small volume and high oil absorption efficiency. Drawings Fig. 1 is an overall cross-sectional view of the present invention, fig. 2 is an overall three-dimensional cross-sectional view, fig. 3 is a schematic view of a front end