CN219242195U

CN219242195U - Double-driving arc gear shaft high-pressure oil pump

Info

Publication number: CN219242195U
Application number: CN202321274386.6U
Authority: CN
Inventors: 许飞鹏; 王淑坤; 于萍; 刘伟; 林新英; 童慧芬
Original assignee: Quanzhou Meida Machinery Design Co ltd
Current assignee: Quanzhou Meida Machinery Design Co ltd
Priority date: 2023-05-24
Filing date: 2023-05-24
Publication date: 2023-06-23
Anticipated expiration: 2033-05-24

Abstract

The utility model relates to the field of gear pumps, in particular to a double-driving circular arc gear shaft high-pressure oil pump. The technical problem to be solved by the utility model is to provide the double-driving circular arc gear shaft high-pressure oil pump which can eliminate the phenomenon of oil trapping, ensure the working stability, reduce the abrasion caused by the meshing friction between gear teeth, prolong the service life and improve the service efficiency, and is convenient to repair and maintain. A double-driving circular arc gear shaft high-pressure oil pump comprises a pump body, a driving shaft, a driven shaft, a first circular arc gear, a second circular arc gear, a rotating piece, a transmission gear set, an oil seal and a side plate. The utility model achieves the effects of eliminating the phenomenon of oil trapping, ensuring the working stability, reducing the abrasion caused by the meshing friction between gear teeth, prolonging the service life and facilitating the maintenance.

Description

Double-driving arc gear shaft high-pressure oil pump

Technical Field

The utility model relates to the field of gear pumps, in particular to a double-driving circular arc gear shaft high-pressure oil pump.

Background

Gear pumps are rotary pumps that rely on the change and movement of working volume created between a pump cylinder and an intermeshing gear to deliver or pressurize a liquid. When the gears rotate, the volume of the space at the disengaging side of the gears is changed from small to large, vacuum is formed, liquid is sucked in, the volume of the space at the engaging side of the gears is changed from large to small, and the liquid is extruded into the pipeline. The suction chamber is separated from the discharge chamber by the meshing line of the two gears. The pressure at the discharge of the gear pump is entirely dependent on the amount of resistance at the pump outlet; in the related art, the gear assembly of the gear pump adopts a pair of mutually meshed involute gears, and in order to ensure meshing stability and meshing continuity, the involute gears require that the overlapping coefficient of gear meshing is greater than 1, that is, when the front gear teeth are not yet meshed, the rear gear teeth enter meshing, so that the moment that the front gear teeth and the rear gear teeth are meshed simultaneously can occur, a meshing closed volume can be formed between the meshing lines, a part of liquid can be trapped in the meshing closed volume, and the phenomenon of oil trapping occurs, so that the gear pump has the defects of large noise, large vibration, reduced volumetric efficiency, increased power loss, lower working pressure and the like along with the continued rotation of the gear assembly.

In order to solve the technical problems, in the related art, the gear pump internal gear assembly adopts a pair of mutually meshed circular arc gears to pump liquid, and in the meshing rotation process of the circular arc gears, the tooth tops and tooth roots are in gapless meshing, so that the phenomenon of oil trapping can be reduced, the working stability of the gear pump is improved, and the working noise is reduced; however, the circular arc gear drives the point meshing gear with the circular arc profile, so that the gear is easy to wear, after a period of use, the gear teeth are worn in, and in fact, the profile of the gear can be contacted along a section of line with a quite long profile along the tooth height, so that gaps are formed between the tooth tops and the tooth roots, liquid in the pump body is easy to generate circumferential play, the pump body vibrates, and the working stability and the service life of the gear pump body are affected; therefore, development of a double-driving circular arc gear shaft high-pressure oil pump capable of eliminating the oil trapping phenomenon, guaranteeing the working stability, reducing abrasion caused by meshing friction between gear teeth, prolonging the service life and facilitating maintenance is needed.

Disclosure of Invention

The utility model aims to overcome the defects that the circular arc gear is easy to wear, gaps are formed between tooth tops and tooth roots after the circular arc gear is used for a period of time, so that liquid in a pump body is easy to circumferentially float, pump body vibration is caused, and the working stability of a gear pump is influenced.

The utility model is achieved by the following specific technical means:

the utility model provides a dual-drive circular arc gear shaft high-pressure oil pump, includes the pump body, through rotatable driving shaft that sets up in the pump body of rotating the piece and rotatable driven shaft that sets up in the pump body through rotating the piece, driving shaft and driven shaft are parallel to each other; the driving shaft and the driven shaft are respectively provided with a first circular arc gear and a second circular arc gear, and the structural shapes of the first circular arc gear and the second circular arc gear are equal; the tooth tops and tooth grooves of the first arc gear and the second arc gear are arc-shaped with the same radius, and the tooth tops and the tooth grooves are connected smoothly; one end of the driving shaft and one end of the driven shaft are also provided with a transmission gear set for transmission connection between the driving shaft and the driven shaft, the transmission gear set comprises a driving gear and a driven gear which are connected in a meshed manner, and the driving gear and the driven gear are respectively connected and fixed with the driving shaft and the driven shaft through key grooves or special-shaped holes;

the pump body comprises a front end cover, a first shell, a second shell and a rear end cover; the center of the first shell is provided with a water delivery cavity for installing a first circular arc gear and a second circular arc gear; the end face, close to one side of the second shell, of the rear end cover is provided with a mounting groove for mounting the transmission gear set, and the end face, close to one side of the second shell, of the rear end cover is also provided with a mounting groove for mounting the transmission gear set; the front end cover, the first shell and the second shell are sequentially and fixedly connected into a whole through studs; the rear end cover is fixedly connected with the second shell through bolts.

Furthermore, the driving gear and the driven gear are straight-tooth involute gears, and the tooth numbers, the modulus, the pressure angle, the tooth top coefficient and the top clearance coefficient of the driving gear and the driven gear are all equal; the torque transmitted by the involute gear is constant, so that the pressure between the transmission shaft and the rotating piece is balanced, and the bag ensures the working stability of the transmission shaft.

Furthermore, oil seals are arranged at the rotary connection positions of the two ends of the driving shaft and the driven shaft and the pump body; preventing axial leakage of the liquid medium.

Further, side plates are arranged between the end surfaces of the two sides of the first circular arc gear and the second circular arc gear and the inner wall of the water delivery cavity arranged on the first shell; the sealing performance of the water conveying cavity is improved, the movement of liquid among the sealing cavities is reduced, the hydraulic axial force is reduced, and the pressurizing conveying stability is improved.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the points of the circular arc gears are in continuous contact with the gear teeth, namely double circular arcs and sinusoidal curves are compounded into tooth shapes, so that the involute gear is replaced, the tooth tops and tooth roots of the circular arc gears are in gapless point contact engagement, the phenomenon of oil trapping can be eliminated, the vibration of the gear pump is reduced, the noise is reduced, and the working stability is ensured; meanwhile, the transmission gear set is arranged to transmit torque to drive the circular gears to rotate in a meshed manner, so that abrasion caused by meshing friction between the circular gears is reduced, and the service life and the service efficiency are improved; the pump body that multistage formula set up is convenient for maintenance.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic view of a partially cut-away perspective structure of the present utility model.

Fig. 3 is a schematic view of a semi-sectional perspective structure of the present utility model.

FIG. 4 is a schematic diagram of the mounting structure of the drive gear set of the present utility model.

Fig. 5 is a schematic view of the engagement structure of the present utility model.

The marks in the drawings are: the device comprises a pump body, a 2-driving shaft, a 3-driven shaft, a 4-first circular gear, a 5-second circular gear, a 6-rotating piece, a 7-transmission gear set, an 8-oil seal, a 9-side plate, an 11-front end cover, a 12-first shell, a 13-second shell, a 14-rear end cover, a 71-driving gear and a 72-driven gear.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

1-5, the dual-driving circular arc gear shaft high-pressure oil pump comprises a pump body 1, a driving shaft 2 rotatably arranged in the pump body 1 through a rotating piece 6 and a driven shaft 3 rotatably arranged in the pump body 1 through the rotating piece 6, wherein the driving shaft 2 and the driven shaft 3 are parallel to each other; the driving shaft 2 and the driven shaft 3 are respectively provided with a first circular arc gear 4 and a second circular arc gear 5, and the structural shapes of the first circular arc gear 4 and the second circular arc gear 5 are equal; the tooth tops and tooth grooves of the first arc gear 4 and the second arc gear 5 are arc-shaped with the same radius, and the tooth tops and the tooth grooves are connected smoothly; one end of the driving shaft 2 and one end of the driven shaft 3 are also provided with a transmission gear set 7 used for transmission connection between the driving shaft 2 and the driven shaft 3, the transmission gear set 7 comprises a driving gear 71 and a driven gear 72 which are in meshed connection with each other, and the driving gear 71 and the driven gear 72 are respectively connected and fixed with the driving shaft 2 and the driven shaft 3 through key grooves;

the pump body 1 comprises a front end cover 11, a first shell 12, a second shell 13 and a rear end cover 14; the center of the first shell 12 is provided with a water delivery cavity for installing the first circular arc gear 4 and the second circular arc gear 5; the end face of the side, close to the rear end cover 14, of the second shell 13 is provided with a mounting groove for mounting the transmission gear set 7, and the end face of the side, close to the second shell 13, of the rear end cover 14 is also provided with a mounting groove for mounting the transmission gear set 7; the front end cover 11, the first shell 12 and the second shell 13 are sequentially and fixedly connected into a whole through studs; the rear end cap 14 is fixedly connected with the second housing 13 by bolts.

Working principle:

according to the gear pump, the medium is pressurized and conveyed through the engagement of the first circular arc gear 4 and the second circular arc gear 5 arranged on the driving shaft 2 and the driven shaft 3, the first circular arc gear 4 and the second circular arc gear 5 adopt the structures of the circular arc tooth tops and the circular arc tooth groove bottoms, and when the first circular arc gear 4 and the second circular arc gear 5 are engaged, the gear teeth can be engaged without gaps, the phenomenon of oil trapping in the engagement process of the first circular arc gear 4 and the second circular arc gear 5 is eliminated, so that the circumferential movement of the first circular arc gear 4 and the second circular arc gear 5 is prevented, and the working stability of the gear pump and the service life of the rotating piece 6 are ensured.

Meanwhile, one end of the driving shaft 2 and one end of the driven shaft 3 are also provided with a transmission gear set 7, and the driven gear 72 fixedly arranged on the driven shaft 3 is driven to rotate through the meshing of the driving gear 71 fixedly arranged on the driving shaft 2, so that the driving shaft 2 and the driven shaft 3 transmit torque through the transmission gear set 7 arranged on the rear side, and the first circular arc gear 4 and the second circular arc gear 5 arranged on the driving shaft 2 and the driven shaft 3 are meshed with each other in a rotating way along with the driving shaft 2 and the driven shaft 3; the meshing friction force between the gear teeth is reduced in the process of meshing the first circular arc gear 4 and the second circular arc gear 5 with the pressurizing conveying medium, so that the abrasion of the first circular arc gear 4 and the second circular arc gear 5 is reduced, the service life is prolonged, and the medium in the water conveying cavity is prevented from circumferential movement after the gear teeth are abraded; and the driving gear 71 and the driven gear 72 are straight-tooth involute gears, the torque transmitted by the involute gears is constant, the pressure between gear teeth and between the shaft and the rotating piece 6 is unchanged in magnitude and direction, and the working stability of the driving shaft 2 and the driven shaft 3 is ensured.

Meanwhile, the pump body 1 is arranged in a multi-section mode and comprises a front end cover 11, a first shell 12, a second shell 13 and a rear end cover 14; the front end cover 11, the first shell 12 and the second shell 13 are integrally and fixedly connected through studs, the rear end cover 14 is fixedly connected with the second shell 13 through bolts, and the transmission gear set 7 is arranged in a mounting groove arranged between the second shell 13 and the rear end cover 14 to protect the transmission gear set 7; meanwhile, when the transmission gear set 7 fails or needs to be maintained, the rear end cover 14 can be detached from the second shell 13 independently through a tool, so that the transmission gear set 7 can be maintained and maintained conveniently without being detached integrally, the gear pump can be used conveniently, and the service life of the gear pump is prolonged.

While the present disclosure has been described in detail with reference to exemplary embodiments, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the present disclosure.

Claims

1. The double-driving circular arc gear shaft high-pressure oil pump is characterized by comprising a pump body (1), a driving shaft (2) rotatably arranged in the pump body (1) through a rotating piece (6) and a driven shaft (3) rotatably arranged in the pump body (1) through the rotating piece (6), wherein the driving shaft (2) and the driven shaft (3) are parallel to each other; a first circular arc gear (4) and a second circular arc gear (5) are respectively arranged on the driving shaft (2) and the driven shaft (3), and the structural shapes of the first circular arc gear (4) and the second circular arc gear (5) are equal; the tooth tops and tooth grooves of the first arc gear (4) and the second arc gear (5) are arc-shaped with the same radius, and the tooth tops and the tooth grooves are connected smoothly; one end of the driving shaft (2) and one end of the driven shaft (3) are also provided with a transmission gear set (7) used for transmission connection between the driving shaft (2) and the driven shaft (3), the transmission gear set (7) comprises a driving gear (71) and a driven gear (72) which are connected with each other in a meshed manner, and the driving gear (71) and the driven gear (72) are respectively connected and fixed with the driving shaft (2) and the driven shaft (3) through key grooves or special-shaped holes;

the pump body (1) comprises a front end cover (11), a first shell (12), a second shell (13) and a rear end cover (14); the center of the first shell (12) is provided with a water delivery cavity for installing the first circular arc gear (4) and the second circular arc gear (5); the end face, close to the rear end cover (14), of the second shell (13) is provided with a mounting groove for mounting the transmission gear set (7), and the end face, close to the second shell (13), of the rear end cover (14) is also provided with a mounting groove for mounting the transmission gear set (7); the front end cover (11), the first shell (12) and the second shell (13) are sequentially and fixedly connected into a whole through studs; the rear end cover (14) is fixedly connected with the second shell (13) through bolts.

2. The dual-driving circular arc gear shaft high-pressure oil pump according to claim 1, wherein the driving gear (71) and the driven gear (72) are straight-tooth involute gears, and the number of teeth, modulus, pressure angle, tooth top coefficient and top clearance coefficient of the driving gear (71) and the driven gear (72) are all equal.

3. The dual-driving circular arc gear shaft high-pressure oil pump according to claim 1, wherein oil seals (8) are further arranged at the rotary connection positions of the two ends of the driving shaft (2) and the driven shaft (3) and the pump body (1).

4. The dual-drive circular arc gear shaft high-pressure oil pump according to claim 1, wherein a side plate (9) is further arranged between the end surfaces of the two sides of the first circular arc gear (4) and the second circular arc gear (5) and the inner wall of the water delivery cavity of the first shell (12).