CN217976576U

CN217976576U - Cycloidal internal gear oil pump

Info

Publication number: CN217976576U
Application number: CN202222159321.9U
Authority: CN
Inventors: 候兰凯
Original assignee: Qingzhou Xinrun Machinery Co ltd
Current assignee: Qingzhou Xinrun Machinery Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-12-06
Anticipated expiration: 2032-08-17

Abstract

The utility model relates to a gear oil pump technical field, a cycloid internal engagement gear oil pump, including shell and transmission shaft, still include initiative rotor, driven rotor and axle sleeve, initiative rotor, driven rotor and axle sleeve are located the shell, driven rotor with the meshing of initiative rotor, be equipped with the eccentric shaft hole of vertical direction on the axle sleeve, driven rotor overlaps and establishes inside the eccentric shaft hole, and the center pin coincidence of eccentric shaft hole and driven rotor, axle sleeve and the center pin coincidence of initiative rotor, the shell includes upper end cover and lower end cover, the transmission shaft passes the axis department of upper end cover is connected with the initiative rotor. The utility model is provided with the shaft sleeve, so as to prevent direct friction between the outer ring of the driven rotor and the inner wall of the shell, and in addition, the eccentric shaft hole increases the transverse bearing capacity of the shaft sleeve, thereby increasing the service life of the device; the device has compact structure size, small occupied size, large displacement under the same size and strong wear resistance.

Description

Cycloidal internal gear oil pump

Technical Field

The utility model relates to a gear oil pump technical field specifically is a cycloid internal gear oil pump.

Background

The gear pump is a commonly used pump in a hydraulic system and is divided into an external meshing pump and an internal meshing pump, the external meshing gear pump mainly comprises a pair of gears supported by bearings, a shell, a front cover, a rear cover and the like, and the rotation directions of rotors are opposite. The drive shaft extends out of the front cover and is sealed by a shaft seal, and the external engagement can ensure good abrasion resistance, particularly at low speeds. With a pressing force proportional to the oil pressure, an internal seal can be achieved, ensuring optimum efficiency. The internal gear pump is divided into an involute tooth form and a cycloid tooth form (rotor pump), the working principle of the internal gear pump is basically the same as that of the external gear pump, oil absorption and oil pressing are realized by means of volume change, however, in order to ensure that the oil absorption and oil pressing ports are separated, a crescent partition plate needs to be added in the middle of the involute gear pump, two gears in the cycloid gear pump only differ by one tooth, the fact that the oil absorption and oil pressing are not communicated can be guaranteed all the time during meshing, and the crescent partition plate is not needed.

Because the inner gear and the pump body of the conventional pump both use iron as basic materials, although the materials are processed by various methods, the material composition difference is small, the intersolubility is high, and particularly under the condition of severe high-pressure working environment, the phenomenon of lubricating oil film breakage can occur, and the seizure abrasion is easy. The higher the pressure of the oil discharge area of the pump is, the larger the eccentric force acting on the internal gear is, so that the internal gear can be tightly pressed in the inner cavity of the pump body to operate, when the pressure is high to a certain degree, an oil film between the outer ring of the internal gear and the inner cavity wall of the pump body is broken, direct friction is generated, and strain occlusion damage is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cycloid internal gear oil pump aims at solving and can keep the intensity of oil film in high pressure and fast-speed adverse work environment, avoids producing direct friction, increases substantially the life of device. The specific implementation mode is as follows:

the utility model provides a cycloid internal gear oil pump, includes shell and transmission shaft, still includes initiative rotor, driven rotor and axle sleeve, initiative rotor, driven rotor and axle sleeve are located the shell, driven rotor with the meshing of initiative rotor, be equipped with the eccentric shaft hole of vertical direction on the axle sleeve, driven rotor cover is established inside the eccentric shaft hole, and the center pin coincidence of eccentric shaft hole and driven rotor, axle sleeve and initiative rotor, the shell includes upper end cover and lower end cover, the transmission shaft passes the axis department of upper end cover is connected with initiative rotor, be equipped with bilateral symmetry's inlet port and oil outlet on the upper end cover, inlet port and oil outlet communicate with oil absorption tank and pressure oil tank respectively, the cavity of inhaling the oil tank is greater than the cavity of pressure oil tank, the axle sleeve can prevent the direct friction between the outer lane of internal gear and the pump body wall, and the horizontal bearing capacity that eccentric shaft hole has increased the axle sleeve, has increased the service life of pump.

Furthermore, connecting bolt holes are formed in four end points of the upper end cover, through holes are formed in four end points of the lower end cover, and the through holes are in bolt connection with the connecting bolt holes.

Furthermore, the oil suction groove and the oil pressing groove are of arc structures which are symmetrical left and right.

Further, the driving rotor and the driven rotor have a number ratio of teeth of 4:5, the number of teeth is few, and the structure size is compact, and its gear pump of relative equal discharge capacity occupies smallly.

Further, the driving rotor is provided with circular arc surface teeth, the driven rotor is provided with composite teeth, and the design increases the strength and rigidity of the driving rotor and the driven rotor.

Furthermore, the lateral wall of the shaft sleeve is provided with mounting grooves which are bilaterally symmetrical, so that the shaft sleeve can be mounted and dismounted conveniently.

Furthermore, one side of the upper end cover is provided with a plurality of mounting bolt holes, so that the pump body can be conveniently mounted.

Furthermore, the lower terminal surface of upper end cover is equipped with first axle sleeve groove, and the up end of lower end cover is equipped with second axle sleeve groove, the top and the bottom of axle sleeve respectively with first axle sleeve groove and second axle sleeve groove interference fit, guarantee the leakproofness of the pump body, and reduced the friction.

Furthermore, a transmission shaft groove is formed below the second shaft sleeve groove, and the bottom of the transmission shaft groove is wider than the transmission shaft, so that friction between the transmission shaft and the shell is reduced.

Owing to adopted above technical scheme, the beneficial technical effect of the utility model is that:

1. the utility model discloses in set up the axle sleeve, the axle sleeve can prevent the direct friction between driven rotor's outer lane and the shell inner wall, simultaneously, the top and the bottom of axle sleeve respectively with first axle sleeve groove and second axle sleeve groove interference fit, guarantee the leakproofness of the pump body, and reduced the friction, the eccentric shaft hole has increased the horizontal bearing capacity of axle sleeve in addition, has increased the life of device;

2. the utility model discloses structure size is compact, occupies smallly, and discharge capacity is big under the equal size, and the wearability of the flank of tooth of initiative rotor and follower rotor is strong.

Drawings

Fig. 1 is an exploded view of a cycloidal internal gear oil pump according to the present invention;

fig. 2 is a schematic structural diagram of a cycloid internal gear oil pump of the present invention;

fig. 3 is a bottom view of the upper end cap of the present invention;

fig. 4 is a cross-sectional view of the middle lower end cap of the present invention;

fig. 5 is a schematic view of a partial structure of a cycloid internal gear oil pump according to the present invention;

fig. 6 is a schematic structural view of the middle shaft sleeve of the present invention.

Description of reference numerals:

1. a shell, 2, a transmission shaft, 3, a driving rotor, 4, a driven rotor, 5 and a shaft sleeve,

11. an upper end cover 12, a lower end cover,

111. oil inlet holes 112, oil outlet holes 113, oil suction grooves 114, oil pressing grooves 115, connecting bolt holes 116, mounting bolt holes 117, first shaft sleeve grooves 121, through holes 122, second shaft sleeve grooves 123 and transmission shaft grooves,

51. eccentric shaft hole 52 and mounting groove.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples:

it should be noted that the structure, proportion, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any modification of the structure, change of the proportion relation or adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function and the achievable purpose of the present invention.

Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

The present invention is described with reference to fig. 1 to 6, in which:

the utility model provides a cycloid internal gear oil pump, includes shell 1 and transmission shaft 2, still includes initiative rotor 3, driven rotor 4 and axle sleeve 5, initiative rotor 3, driven rotor 4 and axle sleeve 5 are located shell 1, driven rotor 4 with the meshing of initiative rotor 3, be equipped with the eccentric shaft hole 51 of vertical direction on the axle sleeve 5, driven rotor 4 cover is established inside eccentric shaft hole 51, and eccentric shaft hole 51 and driven rotor 4's center pin coincidence, axle sleeve 5 and the center pin coincidence of initiative rotor 3, shell 1 includes upper end cover 11 and lower end cover 12, transmission shaft 2 passes the axis department of upper end cover 11 is connected with initiative rotor 3, be equipped with bilateral symmetry's inlet port 111 and oil outlet 112 on the upper end cover 11, inlet port 111 and oil outlet 112 communicate with oil absorption groove 113 and pressure oil tank 114 respectively, the cavity of oil absorption groove 113 is greater than the cavity of pressure oil tank 114, axle sleeve 5 can prevent the outer lane of driven rotor 4 and the direct friction between the shell 1 inner chamber wall, and eccentric shaft hole 51 has increased the horizontal bearing force of axle sleeve 5, has increased the service life limit of pump, and oil absorption groove 113's cavity is greater than the steady cavity has been favorable to the discharge when oil discharge, the steady pressure has been favorable to discharge oil discharge.

Connecting bolt holes 115 are arranged at four end points of the upper end cover 11, through holes 121 are arranged at four end points of the lower end cover 12, and the through holes 121 are in bolt connection with the connecting bolt holes 115.

The oil suction groove 113 and the oil pressing groove 114 are in bilaterally symmetrical arc structures, and the arc oil suction groove 113 and the oil pressing groove 114 can be better matched with the teeth of the driving rotor 3.

The number ratio of the teeth of the driving rotor 3 to the driven rotor 4 is 4:5, the number of teeth is few, and the structure size is compact, and its gear pump of relative equal discharge capacity occupies smallly.

The driving rotor 3 is provided with arc-surface teeth, the driven rotor 4 is provided with plane teeth, and the design increases the strength and rigidity of the driving rotor 3 and the driven rotor 4, so that the driving rotor 3 and the driven rotor 4 have better wear resistance, and the service life is prolonged.

The lateral wall of the shaft sleeve 5 is provided with mounting grooves 52 which are bilaterally symmetrical, so that the shaft sleeve 5 can be conveniently mounted and dismounted.

One side of the upper end cover 11 is provided with a plurality of mounting bolt holes 116, which is convenient for mounting the pump body.

The lower terminal surface of upper end cover 11 is equipped with first axle sleeve groove 117, and the up end of lower extreme cover 12 is equipped with second axle sleeve groove 122, the top and the bottom of axle sleeve 5 respectively with first axle sleeve groove 117 and second axle sleeve groove 122 interference fit, guarantee the leakproofness of the pump body, and reduced the friction, increased the life of device.

The transmission shaft groove 123 is formed below the second shaft sleeve groove 122, the bottom of the transmission shaft groove 123 is wider than the transmission shaft 2, friction between the transmission shaft 2 and the shell 1 is reduced, and noise generated when the device works is reduced.

The utility model discloses the theory of operation: oil absorption and pressure oil are realized by utilizing the change of the sealing volume between the teeth. The driven rotor 4 has one more tooth than the driving rotor 3 and is engaged by a plurality of teeth, thus forming a plurality of sealed volumes. When the transmission shaft 2 drives the driving rotor 3 to rotate around the shaft, the driving rotor 3 drives the driven rotor 4 to rotate in the same direction. At this time, the sealed volume formed between the tooth crest of the driving rotor 3 and the tooth trough of the driven rotor 4 is gradually enlarged along with the rotation of the driving rotor 3 and the driven rotor 4, so that a partial vacuum is formed, oil enters from the oil inlet 111 through the oil suction groove 113 and is sucked into the sealed volume, when the oil reaches the tooth crest of the driving rotor 3 and the tooth trough of the driven rotor 4, the sealed volume is maximum, and at this time, the oil suction is finished; when the driving rotor 3 and the driven rotor 4 continue to rotate, the sealing volume filled with oil is gradually reduced, the oil is extruded, then the oil is discharged through the oil outlet 112, when the other tooth of the driving rotor 3 is completely meshed with the tooth recess of the driven rotor 4, the oil pressing is completed, the driving rotor 3 only has 4 teeth, the driven rotor 4 only has 5 teeth, the number of teeth is small, the structure size is compact, the gear pump has the same relative displacement, the occupied size is small, the shaft sleeve 5 can prevent the direct friction between the outer ring of the driving rotor 3 and the inner wall of the shell 1, the shaft sleeve 5 is in interference fit with the shell 1, the sealing performance of the device is improved, the friction is reduced, the transverse bearing capacity of the shaft sleeve 5 is increased through the eccentric shaft hole 51, and the service life of the device is prolonged.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.

Claims

1. A cycloid internal gear oil pump, includes shell (1) and transmission shaft (2), its characterized in that: still include initiative rotor (3), driven rotor (4) and axle sleeve (5), initiative rotor (3), driven rotor (4) and axle sleeve (5) are located shell (1), driven rotor (4) with initiative rotor (3) meshing, be equipped with eccentric shaft hole (51) of vertical direction on axle sleeve (5), driven rotor (4) cover is established inside eccentric shaft hole (51), and eccentric shaft hole (51) coincide with the center pin of driven rotor (4), and axle sleeve (5) coincide with the center pin of initiative rotor (3), shell (1) includes upper end cover (11) and lower end cover (12), transmission shaft (2) pass the axis department of upper end cover (11) is connected with initiative rotor (3), be equipped with bilateral symmetry's inlet port (111) and oil outlet (112) on upper end cover (11), inlet port (111) and oil outlet (112) communicate with oil absorption groove (113) and pressure oil tank (114) respectively, the cavity that inhales oil tank (113) is greater than the cavity that presses oil tank (114).

2. The gerotor ring gear oil pump of claim 1, characterized in that connection bolt holes (115) are provided at four end points of the upper end cover (11), and through holes (121) are provided at four end points of the lower end cover (12), the through holes (121) being bolted to the connection bolt holes (115).

3. The gerotor ring gear oil pump of claim 1, characterized in that the oil suction groove (113) and the oil pressing groove (114) are of a bilaterally symmetrical arc structure.

4. The gerotor ring gear oil pump of claim 1, characterized in that the number ratio of teeth of the driving rotor (3) to the driven rotor (4) is 4:5.

5. the gerotor ring gear oil pump of claim 1, characterized in that the driving rotor (3) has circular arc face teeth and the driven rotor (4) has flat face teeth.

6. The gerotor ring gear oil pump of claim 1, characterized in that the side wall of the sleeve (5) is provided with bilaterally symmetrical mounting slots (52).

7. The gerotor oil pump of claim 1, wherein the upper end cap (11) has mounting bolt holes (116) in one side thereof.

8. The gerotor oil pump of claim 1, wherein the lower end surface of the upper end cover (11) is provided with a first bushing groove (117), the upper end surface of the lower end cover (12) is provided with a second bushing groove (122), and the top and the bottom of the bushing (5) are in interference fit with the first bushing groove (117) and the second bushing groove (122), respectively.

9. The gerotor ring gear oil pump of claim 8, characterized in that a drive shaft groove (123) is provided below the second bushing groove (122), the bottom of the drive shaft groove (123) being wider than the drive shaft (2).