CN210771391U - Lubricating pump suitable for wide rotating speed range - Google Patents

Abstract

The utility model relates to the technical field of mechanical pump bodies, in particular to a lubricating pump suitable for a wide rotating speed range, aiming at realizing the adaptability of the lubricating pump to a high rotating speed range; the gear comprises a transmission gear pair with a small tooth difference conjugate modification tooth profile, wherein the minimum curvature radius of points c and e is 1.3-1.5mm, the minimum curvature radius of point d is 5.3-5.5mm, and the rest parts are in smooth transition; two sides of the inner rotor and the outer rotor are respectively provided with an annular reinforcing rib, and one side of each reinforcing rib, which is in contact with the inner rotor and the outer rotor, is provided with a wear-resistant layer; the modified small tooth difference conjugate transmission gear pair has high strength, small flow pulsation and good sealing performance of a meshing point, reduces the phenomena of cavitation erosion and hydraulic impact, and improves the service life and the stability of an oil pump under a high-speed working condition.

Description

Lubricating pump suitable for wide rotating speed range

Technical Field

The utility model relates to a mechanical pump body manufacturing technical field, concretely relates to lubricant pump who is fit for wide rotational speed scope is applied to the cooling and lubrication system of gearbox.

Background

The new energy technology is developed vigorously, the international gearbox is continuously updated, and meanwhile, the development of the domestic gearbox enters a rapid development stage. The use condition of the transmission gear set for the gearbox has two characteristics: 1. the transmission gear set is in varying contact stress for a long period; 2. the working condition of high speed and heavy load is long-term. Due to the characteristics, the closed transmission gear set for the gearbox is easy to generate two failure modes of pitting corrosion and gluing. In order to prevent the closed gear train from losing efficacy and prolong the service life, a cooling and lubricating pump is equipped for the gearbox, so that the development direction of the gearbox in future becomes the direction of the development of the gearbox.

With the continuous improvement of the performance of the lithium battery, the scheme that the motor replaces an internal combustion engine as a power source of the gearbox becomes the trend of upgrading and updating the gearbox. New requirements are placed on the gearbox due to the characteristics of the electric motor: the main shaft has a wide rotating speed range and a rated rotating speed higher than that of the previous generation gearbox, and the new requirement of the gearbox is supported by an adaptive lubricating pump.

The main shaft rotating speed of the new energy gearbox has two common gears which are a medium-low speed and a high speed respectively, and an internal meshing gear oil pump is needed to be adopted in order to ensure that the weight and the volume of the lubricating oil pump are smaller. The traditional low pressure lubricating system at present adopts a fixed clearance cycloid rotor pump, and the fixed clearance cycloid rotor pump has two defects:

1. under the working condition of medium and low rated rotation speed, the line sealing of the gear side gap and the top gap of the inner rotor and the outer rotor is relatively unreliable, and the oil pump has low efficiency. The leakage oil liquid at the radial direction and the meshing line of the gear is more, and the leakage oil liquid forms local flow velocity rising. In the process of increasing the local flow velocity, the pressure of the gap flow is lower than the air separation pressure of the hydraulic oil, gas in the oil is separated out, and cavitation erosion and hydraulic impact are formed on an oil pump after the gas breaks in the oil, so that the potential hazards of reliability and noise of a product are caused.

2. The pump body and the pump cover are made of die-cast aluminum materials, and the iron-based powder metallurgy gear is used as the gear to form two friction pairs, and the friction pairs are lubricated by an oil film formed by the assembly clearance, so that the friction pairs are prevented from being damaged. Under the high rated rotation speed working condition, the lubricating oil film of the product is easy to be damaged, and then the aluminum alloy materials of the pump body and the pump cover are damaged, so that the service life of the product is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art exists not enough, provides a lubricant pump who is fit for wide rotational speed scope to realize that the lubricant pump can adapt to the purpose of high rotational speed scope.

The utility model discloses a realize through following technical scheme.

A lubrication pump suitable for a wide rotating speed range comprises a transmission gear pair with a small tooth difference conjugate modified tooth profile, wherein the minimum curvature radius of points c and e is 1.3-1.5mm, the minimum curvature radius of a point d is 5.3-5.5mm, and the rest parts are in smooth transition; the gear top circles c, d and e are slope catastrophe points, and the tooth root ab section is in smooth transition; the outer rotor gear of the transmission gear pair with the small tooth difference conjugate modification tooth profile is matched with the tooth profile of the inner rotor; the two sides of the inner rotor and the outer rotor are respectively provided with an annular reinforcing rib, one side of the reinforcing rib, which is contacted with the inner rotor and the outer rotor, is provided with a wear-resistant layer, and the other side of the reinforcing rib is fixedly connected with the pump body.

Furthermore, the reinforcing rib is of a metal plate-shaped structure.

Furthermore, the reinforcing ribs are connected with the pump body through positioning pins.

The utility model discloses produced beneficial effect does for prior art.

1. The lubricating pump abandons traditional cycloid rotor profile of tooth, adopts the poor conjugate modification profile of tooth's transmission gear pair less. The large pressure angle curve is used on the meshing working side of the inner rotor gear, so that the distance between a base circle and a reference circle is long, the thickness of a tooth root is increased, and the strength of the gear is improved. The gear addendum circle is trimmed by the structure because the thickness of the addendum circle arc teeth is too small due to the fact that the pressure angle is simply increased. During shape modification, the curve slope of the vertex circle is emphasized to be increased, and the rest part is in smooth transition. The point of abrupt slope improves the reliability of the sealing line when the gear runs, and the diameter of the root circle and the wall thickness formed by the inner hole of the gear are too thin, so the structure carries out smooth modification on the root of the gear.

2. In order to reduce the tooth backlash leakage of the inner rotor and the outer rotor in the meshing process and reduce the influence of the tooth backlash on an oil pump, the inner rotor and the outer rotor adopt conjugate meshing transmission with small tooth difference and modified tooth profile. Performing conjugate modification on the outer rotor according to the tooth profile parameters of the inner rotor; the modified small tooth difference conjugate transmission gear pair has the advantages of compact structure, high strength, stable and reliable transmission, small flow pulsation and good sealing performance of a meshing point, reduces the phenomena of cavitation and hydraulic impact, and improves the performance index of the oil pump at medium and low rotating speeds.

3. The annular reinforcing ribs can not only play a supporting role for the rotor of the rotation, so that the inner rotor and the outer rotor are more stable, but also the deformation of the rotor bending moment caused by the assembly is reduced, and the early wear of the oil pump is prevented. After the two sides of the inner rotor and the outer rotor are simultaneously provided with the double-metal side plates with the annular ribs, the oil pump cannot be severely abraded or scratched under the condition of high rotating speed, and the service life and the stability of the oil pump under the high-speed working condition are improved.

Drawings

Fig. 1 is a schematic structural diagram of an inner rotor according to the present invention.

Fig. 2 is a schematic structural diagram of the outer rotor of the present invention.

Fig. 3 is a schematic structural view of the small tooth difference conjugate transmission gear pair of the present invention.

Fig. 4 is a schematic structural diagram of the annular reinforcing rib of the present invention.

Fig. 5 is a side view of the lubrication pump of the present invention.

In the figure, 1 is the pump body, 2 is the pump cover, 3 is the inner rotor, 4 is the outer rotor, 5 is the left side strengthening rib, 6 is the right side strengthening rib, 7 is the wearing layer.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

As shown in fig. 5, the lubricating pump is suitable for a wide rotating speed range, the lubricating pump comprises an external pump cover 2, a pump body 1 is arranged in the pump cover, a transmission gear pair is arranged in the pump body 1, as shown in fig. 3, the transmission gear pair is a transmission gear pair with a small tooth difference conjugate profile, as shown in fig. 1, a bc section and an ef section of a gear meshing working side of an inner rotor 3 use large pressure angle curves, so that the distance between a base circle and a reference circle is long, the thickness of a tooth root is increased, and the strength of the gear can be improved. Because the addendum circle arc tooth thickness is too small due to the simple increase of the pressure angle, the gear addendum circle (cde section) is modified, the minimum curvature radius of the points c and e is set between 1.3mm and 1.5mm, the minimum curvature radius of the point d is set between 5.3mm and 5.5mm, and the rest part is in smooth transition. The points c, d and e of the gear top circles are slope catastrophe points, and the reliability of the sealing line during gear operation can be improved at the points c, d and e of the curvature radius extreme values. The diameter of the root circle and the wall thickness formed by the inner hole of the gear are too thin, so the gear root of the ab section is smoothly modified. The rest part is in smooth transition; as shown in fig. 2, the outer rotor 4 gear of the transmission gear pair with the small tooth difference conjugate modification tooth profile is adapted to the tooth profile of the inner rotor 3; two sides of the inner rotor and the outer rotor are respectively provided with an annular left reinforcing rib 5 and an annular right reinforcing rib 6, and the left reinforcing rib 5 and the right reinforcing rib 6 are respectively connected with the pump body through positioning pins. As shown in fig. 4, a wear-resistant layer 7 is attached to one side of the left reinforcing rib 5 and the right reinforcing rib 6, which is in contact with the inner rotor and the outer rotor, and the left reinforcing rib 5 and the right reinforcing rib 6 adopt a 20+ QPb10-10 bimetal powder metallurgy forming process, wherein an iron-based part ensures the rigidity of the reinforcing ribs, and the copper-based part is in direct contact with the inner rotor and the outer rotor due to high wear resistance to serve as a wear-resistant material of a friction pair of the oil pump.

The annular reinforcing rib not only can play a supporting role for the rotor of rotation, so that the inner rotor and the outer rotor are more stable, but also reduces the deformation of the rotor bending moment caused by assembly, and prevents the early abrasion of an oil pump.

After the double-metal side plate with the annular ribs is used on the two sides of the inner rotor and the outer rotor at the same time (as shown in fig. 5), the oil pump cannot be severely abraded or scratched under the condition of high rotating speed, and the service life and the stability of the oil pump under the high-speed working condition are improved.

The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.

Claims (3)

1. The lubricating pump is characterized by comprising a transmission gear pair with a small tooth difference conjugate modification tooth profile, wherein the minimum curvature radius of points c and e is 1.3-1.5mm, the minimum curvature radius of the point d is 5.3-5.5mm, and the rest parts are in smooth transition; the gear top circles c, d and e are slope catastrophe points, and the tooth root ab section is in smooth transition; the outer rotor gear of the transmission gear pair with the small tooth difference conjugate modification tooth profile is matched with the tooth profile of the inner rotor; the two sides of the inner rotor and the outer rotor are respectively provided with an annular reinforcing rib, one side of the reinforcing rib, which is contacted with the inner rotor and the outer rotor, is provided with a wear-resistant layer, and the other side of the reinforcing rib is fixedly connected with the pump body.

2. The lubricant pump as recited in claim 1, adapted for a wide range of rotational speeds, wherein the ribs are of a metal plate-like construction.

3. The lubrication pump for a wide range of speeds as recited in claim 1, wherein said ribs are attached to the pump body by locating pins.

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