CN212985523U

CN212985523U - Gear pump

Info

Publication number: CN212985523U
Application number: CN202021394213.4U
Authority: CN
Inventors: 许�鹏; 刘金伟; 宋玉良; 范瑞楠
Original assignee: Weichai Power Qingzhou Transmission Control Technology Co ltd; Weichai Power Co Ltd
Current assignee: Weichai Power Qingzhou Transmission Control Technology Co ltd; Weichai Power Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-04-16
Anticipated expiration: 2030-07-15

Abstract

The utility model provides a gear pump, this gear pump includes: the oil inlet channel is communicated with the oil cavity, and the cross section area of the oil inlet channel is gradually increased in the direction close to the oil cavity; and the transmission assembly is arranged in the oil cavity. Through the technical scheme that this application provided, the problem of noise easily appears in the gear pump among the prior art can be solved.

Description

Gear pump

Technical Field

The utility model relates to a hydraulic transmission technical field particularly, relates to a gear pump.

Background

At present, kinetic energy of an engine or a motor can be converted into hydraulic energy by using a gear pump. Wherein, be provided with oil feed passageway on the casing of gear pump.

However, in the prior art, the structural design of oil feed passageway is unreasonable, causes easily when the rotational speed of gear pump is too high to inhale the sky to lead to the gear pump noise to appear, influence the use of product.

Therefore, the problem that noise is easy to generate in the gear pump exists in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gear pump to solve the problem that the noise easily appears in gear pump among the prior art.

The utility model provides a gear pump, gear pump includes: the oil inlet channel is communicated with the oil cavity, and the cross section area of the oil inlet channel is gradually increased in the direction close to the oil cavity; and the transmission assembly is arranged in the oil cavity.

Further, the gear pump still includes the water conservancy diversion structure, and transmission assembly includes the gear structure, and the gear structure is last to be provided with the water conservancy diversion structure.

Further, gear structure includes intermeshing's driving gear axle and driven gear axle, and the driving gear axle includes first axis body and a plurality of first teeth of setting on the first axis body, and the driven gear axle includes the second axis body and sets up a plurality of second teeth on the second axis body, and the junction of first tooth and first axis body and the junction of second tooth and second axis body all are provided with the water conservancy diversion structure.

Further, the diversion structure comprises a first diversion trench and a second diversion trench, the first diversion trench is arranged at the joint of the first tooth and the first shaft body and is located at the end part of the first tooth in the axial direction, the first diversion trench extends along the circumferential direction of the first shaft body, the second diversion trench is arranged at the joint of the second tooth and the second shaft body and is located at the end part of the second tooth in the axial direction, and the second diversion trench extends along the circumferential direction of the second shaft body.

Further, the cross section of the first diversion trench is arc-shaped and/or the cross section of the second diversion trench is arc-shaped.

Further, the casing includes end cover and pump body, and the oil feed passageway sets up on the pump body.

Further, the cross section of the oil inlet channel is circular.

Further, the end cover is detachably connected with the pump body, and a first sealing element is arranged between the end cover and the pump body.

Further, the axis of the oil inlet channel is perpendicular to the axis of the transmission assembly.

Further, the gear pump further includes: bearings are sleeved on the driving gear shaft and the driven gear shaft; and the side plate is arranged between the bearing and the driving gear shaft or the driven gear shaft, and a second sealing element is arranged on the side plate.

Use the technical scheme of the utility model, this gear pump includes casing and drive assembly, and the casing has the oil pocket, and drive assembly sets up in the oil pocket. Through set up the oil feed passageway with the oil pocket intercommunication on the casing to make the cross sectional area of oil feed passageway increase gradually in the direction that is close to the oil pocket, can optimize the structure of oil feed passageway, thereby can increase the oil input volume of oil feed passageway, make the gear pump can not appear inhaling empty condition under the high rotational speed's the condition, and then the gear pump can not appear the noise because of inhaling empty.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a cross-sectional view of a gear pump provided by an embodiment of the present invention;

fig. 2 shows another position cross-sectional view of a gear pump provided by an embodiment of the present invention;

FIG. 3 shows a schematic structural view of the drive gear shaft of FIG. 1;

fig. 4 shows an enlarged view in partial section at a in fig. 3.

Wherein the figures include the following reference numerals:

10. a housing; 11. an oil inlet channel; 12. an end cap; 13. a pump body; 20. a transmission assembly; 21. a driving gear shaft; 211. a first shaft body; 212. a first tooth; 22. a driven gear shaft; 30. a flow guide structure; 31. a first diversion trench; 40. a first seal member; 50. a bearing; 60. a side plate; 70. a second seal member; 71. an ear type gasket; 72. an ear-shaped baffle plate; 80. a retainer ring; 90. framework oil seal; and the groove depth of the X, the first guide groove and the second guide groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 4, the embodiment of the present invention provides a gear pump, which includes a housing 10 and a transmission assembly 20, wherein the housing 10 has an oil chamber, and the transmission assembly 20 is disposed in the oil chamber. Wherein, be provided with the oil feed passageway 11 with the oil pocket intercommunication on the casing 10, oil can get into the oil pocket through oil feed passageway 11. Specifically, the cross sectional area of the oil inlet channel 11 gradually increases in the direction close to the oil chamber, and the oil inlet amount can be increased compared with the gradually reduced oil inlet channel.

Use the gear pump that this embodiment provided, set up to increase gradually in the direction that is close to the oil pocket through the cross sectional area with oil feed passageway 11, can optimize oil feed passageway 11's structure, utilize oil feed passageway 11 to provide sufficient oil feed volume for the empty condition can not appear inhaling under the high rotational speed condition in the gear pump, and then the gear pump can not appear the noise because of inhaling, and the product can normal use.

Wherein, the cross sectional area of oil feed passageway 11 is crescent in the direction that is close to the oil pocket, including following two kinds of structures:

firstly, the channel wall of the oil inlet channel 11 is a plane or a curved surface, and the size of the oil inlet channel 11 is linearly increased in the direction close to the oil cavity;

secondly, the oil inlet passage 11 includes a plurality of stepped sections, the cross-sectional areas of which are gradually increased in a direction close to the oil chamber, and the cross-sectional area of each stepped section is kept constant.

In this embodiment, the oil inlet passage 11 adopts the first structure.

In this embodiment, the gear pump further includes a diversion structure 30, and the transmission assembly 20 includes a gear structure, and the diversion structure 30 is disposed on the gear structure. Wherein, water conservancy diversion structure 30 can guide the oil that gets into in the oil chamber, utilizes water conservancy diversion structure 30 can promote gear structure's transmission efficiency, and then promotes the transmission efficiency of gear pump. Specifically, the diversion structure includes, but is not limited to, a diversion trench, a diversion plate, and the like, as long as diversion can be achieved and transmission efficiency can be improved.

As shown in fig. 1, the gear structure includes a driving gear shaft 21 and a driven gear shaft 22 that are engaged with each other, and the driving gear shaft 21 and the driven gear shaft 22 are disposed side by side in the oil chamber and engaged with each other. Wherein, the driving gear shaft 21 includes a first shaft body 211 and a plurality of first teeth 212 disposed on the first shaft body 211, the plurality of first teeth 212 are disposed on a sidewall of the first shaft body 211 at intervals in a circumferential direction of the first shaft body 211, the driven gear shaft 22 includes a second shaft body and a plurality of second teeth disposed on the second shaft body at intervals in a circumferential direction of the second shaft body, and the first teeth 212 and the second teeth are engaged with each other. Specifically, the connection between the first tooth 212 and the first shaft 211 and the connection between the second tooth and the second shaft are provided with the diversion structure 30, so that the diversion structure 30 can be utilized to perform diversion in the rotation process of the driving gear shaft 21 and the driven gear shaft 22, and the transmission efficiency can be further improved.

As shown in fig. 3 and 4, the flow guide structure 30 includes a first flow guide groove 31 and a second flow guide groove. Wherein, the first guide groove 31 is arranged at the connection position of the first tooth 212 and the first shaft body 211 and is located at the end of the first tooth 212 in the axial direction, and the first guide groove 31 extends along the circumferential direction of the first shaft body 211 to form an annular groove. The second diversion trench is arranged at the joint of the second tooth and the second shaft body and is positioned at the end part of the second tooth in the axial direction, and the second diversion trench extends along the circumferential direction of the second shaft body to form an annular groove. Specifically, the first guide grooves 31 are disposed at both ends of the first tooth 212 in the axial direction, and the second guide grooves are disposed at both ends of the second tooth in the axial direction, so that the transmission efficiency can be further improved. In the prior art, the tooth root positions of the driving gear shaft and the driven gear shaft are provided with bosses, so that the transmission efficiency is influenced.

The cross section of the first diversion trench 31 is arc-shaped, and the cross section of the second diversion trench is also arc-shaped, so that the diversion effect can be improved to the maximum extent. Specifically, the cross section of the first guide groove 31 refers to a section of the first guide groove 31 in the radial direction of the first shaft body, and the cross section of the second guide groove refers to a section of the second guide groove in the radial direction of the second shaft body. In other embodiments, one of the first and

second channels

31 and 31 may be provided with an arc-shaped cross section, and the other of the first and

second channels

31 and 31 may be provided with a polygon-shaped cross section. Wherein, the polygon comprises a triangle and a rectangle.

In this embodiment, the groove depth of the first guide groove and the second guide groove is X. Specifically, the distance between the tangent line of the groove wall of the first diversion groove and the outer wall of the first tooth is equal to the distance between the groove bottom of the first diversion groove and the outer wall of the first shaft body.

As shown in fig. 1, the housing 10 includes an end cover 12 and a pump body 13 that are detachably connected, and the oil inlet passage 11 is provided on the pump body 13. By adopting the structure, the gear pump is convenient to process and assemble, and the processing and assembling efficiency can be improved.

Specifically, the end cover 12 is provided with a mounting hole, and the driving gear shaft 21 is inserted into the mounting hole.

In the present embodiment, the cross-sectional shape of the oil inlet passage 11 is circular, so that the flow resistance can be reduced. In other embodiments, the cross-sectional shape of the oil intake passage 11 may be provided as a polygon, such as a rectangle.

In order to ensure the sealing performance of the gear pump, the end cover 12 is detachably connected with the pump body 13 through screws, and a first sealing element 40 is arranged between the end cover 12 and the pump body 13. In the present embodiment, the first sealing member 40 is a sealing ring.

In this embodiment, the axis of the oil inlet channel 11 is perpendicular to the axis of the transmission assembly 20, so that the transmission efficiency can be ensured.

As shown in fig. 1, the gear pump further includes a bearing 50 and a side plate 60. The bearings 50 are sleeved on the driving gear shaft 21 and the driven gear shaft 22 to reduce friction when the driving gear shaft 21 and the driven gear shaft 22 rotate. By providing the side plate 60 between the bearing 50 and the driving gear shaft 21 or the driven gear shaft 22, support can be performed by the side plate 60. Specifically, the side plate 60 is provided with a second sealing member 70 to improve sealing performance. In the present embodiment, the second seal member 70 includes an ear seal 71 and an ear flap 72. Wherein the bearing 50 is a needle bearing.

The side plate is made of a bimetal powder metallurgy material, the steel surface is a base body, the material is 20-30 # steel, the copper surface is copper-based powder metallurgy, copper powder and a steel back are sintered and bonded together, and the bonding strength is extremely high. The side plate is a core component in the gear pump, and often determines the performance and reliability of the gear pump, and influences the service life of the gear pump.

In this embodiment, the gear pump further includes a retainer ring 80 and a skeleton oil seal 90, and both the retainer ring 80 and the skeleton oil seal 90 are sleeved on the driving gear shaft 21 and abut against the end cover 12.

In the present embodiment, the accuracy of the drive gear shaft and the driven gear shaft is increased, including pitch limit deviation, ring gear radial run-out tolerance, tooth direction tolerance, and the like.

In this embodiment, the gear pump still includes axial compensation device, and axial compensation device installs inside the curb plate, seals high-pressure oil inside the curb plate through sealing device, and then promotes the curb plate and lean on to the gear shaft terminal surface, realizes the compensation of axial float, guarantees the reliable sealed of axial.

The device provided by the embodiment has the following beneficial effects:

(1) the oil inlet quantity of the oil inlet channel is increased, and the gear pump does not have the condition of air suction at high rotating speed, so that the problem of high noise of the gear pump at high speed is solved, and decibels of the gear pump at high rotating speed are greatly reduced;

(2) through setting up the guiding gutter to promote the precision of gear shaft, increased transmission efficiency and life, satisfied the requirement of host computer factory.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear pump, characterized in that it comprises:

the oil inlet structure comprises a shell (10) and a connecting piece, wherein the shell (10) is provided with an oil inlet channel (11) communicated with the oil cavity, and the cross section area of the oil inlet channel (11) is gradually increased in the direction close to the oil cavity;

a transmission assembly (20) disposed within the oil cavity.

2. Gear pump according to claim 1, characterized in that it further comprises a flow guiding structure (30), the transmission assembly (20) comprising a gear structure on which the flow guiding structure (30) is arranged.

3. Gear pump according to claim 2, characterized in that the gear structure comprises a drive gear shaft (21) and a driven gear shaft (22) which are meshed with each other, the drive gear shaft (21) comprising a first shaft body (211) and a plurality of first teeth (212) arranged on the first shaft body (211), the driven gear shaft (22) comprising a second shaft body and a plurality of second teeth arranged on the second shaft body, the connection of the first teeth (212) with the first shaft body (211) and the connection of the second teeth with the second shaft body being provided with the flow guiding structure (30).

4. Gear pump according to claim 3, characterized in that the flow guiding structure (30) comprises a first flow guiding groove (31) and a second flow guiding groove, the first flow guiding groove (31) is arranged at the junction of the first tooth (212) and the first shaft body (211) and is located at the axial end of the first tooth (212), the first flow guiding groove (31) extends along the circumferential direction of the first shaft body (211), the second flow guiding groove is arranged at the junction of the second tooth and the second shaft body and is located at the axial end of the second tooth, and the second flow guiding groove extends along the circumferential direction of the second shaft body.

5. Gear pump according to claim 4, characterized in that the cross section of the first guide groove (31) is arc-shaped and/or the cross section of the second guide groove is arc-shaped.

6. Gear pump according to claim 1, characterized in that the housing (10) comprises an end cover (12) and a pump body (13), the oil inlet channel (11) being provided on the pump body (13).

7. Gear pump according to claim 1 or 6, characterized in that the cross-sectional shape of the oil inlet channel (11) is circular.

8. Gear pump according to claim 6, characterized in that the end cover (12) is detachably connected with the pump body (13), a first seal (40) being provided between the end cover (12) and the pump body (13).

9. Gear pump according to claim 1, characterized in that the axis of the oil inlet channel (11) is perpendicular to the axis of the transmission assembly (20).

10. The gear pump of claim 3, further comprising:

the bearings (50) are sleeved on the driving gear shaft (21) and the driven gear shaft (22);

and the side plate (60) is arranged between the bearing (50) and the driving gear shaft (21) or the driven gear shaft (22), and a second sealing piece (70) is arranged on the side plate (60).