阅读说明：本技术 一种能优化气蚀的齿轮式机油泵 (Gear type oil pump capable of optimizing cavitation ) 是由 李维顺 许仲秋 刘光明 佘笑梅 于 2021-08-06 设计创作，主要内容包括：本发明提供了一种能优化气蚀的齿轮式机油泵,包括泵体、泵盖、主动齿轮、从动齿轮,所述泵体上设有用于容纳主动齿轮和从动齿轮的齿轮腔,主动齿轮和从动齿轮的轮齿分别与齿轮腔两侧的侧壁形成若干个齿间槽；泵体或泵盖上设有进油口和出油口,泵体和泵盖对应进油口的位置设有低压油槽,对应出油口的位置设有高压油槽,泵体和泵盖上均设有两个轴孔；泵体或泵盖的两个轴孔周围各设有一个环形油槽,每个环形油槽均向外设有第一油槽和第二油槽,第一油槽连通至高压油槽,第二油槽延伸至与齿间槽相对应的位置,第二油槽与高压油槽和低压油槽之间都具有间距。上述技术方案可以优化油泵气蚀,同时降低其产生的局部高压造成的压力波动。(The invention provides a gear type oil pump capable of optimizing cavitation, which comprises a pump body, a pump cover, a driving gear and a driven gear, wherein a gear cavity for accommodating the driving gear and the driven gear is arranged on the pump body, and gear teeth of the driving gear and the driven gear respectively form a plurality of inter-gear grooves with side walls on two sides of the gear cavity; an oil inlet and an oil outlet are formed in the pump body or the pump cover, low-pressure oil grooves are formed in the positions, corresponding to the oil inlet, of the pump body and the pump cover, high-pressure oil grooves are formed in the positions, corresponding to the oil outlet, of the pump body and the pump cover, and two shaft holes are formed in the pump body and the pump cover; the pump body or the pump cover are respectively provided with an annular oil groove around two shaft holes, each annular oil groove is outwards provided with a first oil groove and a second oil groove, the first oil groove is communicated with the high-pressure oil groove, the second oil groove extends to the position corresponding to the inter-tooth groove, and an interval is formed between the second oil groove and the high-pressure oil groove as well as between the second oil groove and the low-pressure oil groove. According to the technical scheme, the cavitation erosion of the oil pump can be optimized, and the pressure fluctuation caused by the local high pressure generated by the oil pump is reduced.)

1. A gear type oil pump capable of optimizing cavitation erosion comprises a pump body (1), a pump cover (2), a driving gear (3), a driven gear (4), a driving shaft and a driven shaft, wherein a gear cavity for accommodating the driving gear (3) and the driven gear (4) is formed in the pump body (1), the driving gear (3) and the driven gear (4) are mutually meshed in the gear cavity, and gear teeth of the driving gear (3) and the driven gear (4) and side walls on two sides of the gear cavity form a plurality of inter-gear grooves (5) respectively; an oil inlet and an oil outlet are formed in the pump body (1) or the pump cover (2), low-pressure oil grooves are formed in the positions, corresponding to the oil inlet, of the pump body (1) and the pump cover (2), high-pressure oil grooves are formed in the positions, corresponding to the oil outlet, of the pump body (1), and two shaft holes are formed in the pump body (1) and the pump cover (2); the method is characterized in that: the pump body (1) or the pump cover (2) are respectively provided with an annular oil groove (6) around two shaft holes, each annular oil groove (6) is outwards provided with a first oil groove (7) and a second oil groove (8), the first oil grooves (7) are communicated to a high-pressure oil groove, the second oil grooves (8) extend to the positions corresponding to the inter-tooth grooves (5), and the second oil grooves (8) are spaced from the high-pressure oil grooves and the low-pressure oil grooves.

2. The gear-type oil pump capable of optimizing cavitation according to claim 1, characterized in that: the first oil groove (7) is a straight groove.

3. The gear-type oil pump capable of optimizing cavitation according to claim 1 or 2, characterized in that: the second oil groove (8) is fan-shaped or L-shaped.

4. The gear-type oil pump capable of optimizing cavitation according to claim 3, characterized in that: the distance between the second oil groove (8) and the low-pressure oil groove is H1, the distance between the second oil groove (8) and the high-pressure oil groove is H2, the width of the single inter-tooth groove (5) is e, H1 is more than e, and H2 is more than or equal to e.

5. The gear-type oil pump capable of optimizing cavitation according to claim 3, characterized in that: the oil introduction inlet of the second oil groove (8) is close to the low-pressure oil groove.

Technical Field

The invention relates to a lubricating system of an internal combustion engine, in particular to a gear type oil pump.

Background

In the oil pump, because some reason can produce the low-pressure region, when pressure is less than air separation pressure, the air that dissolves in the fluid just dissociates, exists in the fluid with the form of bubble, and the bubble gets into high-pressure region along with fluid flow, is compressed or sharply dwindles promptly, and the space that original bubble occupied has formed the vacuum, and the oil liquid matter point all around will be with very big speed towards the center of compressing the bubble, and this process is very violent to produce local hydraulic shock phenomenon. If the impact of the local oil occurs on the metal wall surface, the metal oxidation corrosion is aggravated, so that pits are formed on the surface of the metal part gradually, and the surface falls off to form small pits in serious cases. This phenomenon, in which the corrosion of the metal surface is accelerated by the cavitation action, is called a cavitation phenomenon. In addition, during the transition period of the high-pressure and low-pressure areas of the oil pump, local high pressure cannot be well transited, inevitable pressure fluctuation is caused, and the pressure fluctuation is increased due to the cavitation phenomenon.

Disclosure of Invention

The invention aims to provide a gear type oil pump capable of optimizing cavitation.

In order to solve the technical problems, the technical scheme of the invention is as follows: a gear type oil pump capable of optimizing cavitation erosion comprises a pump body, a pump cover, a driving gear, a driven gear, a driving shaft and a driven shaft, wherein a gear cavity for accommodating the driving gear and the driven gear is formed in the pump body, the driving gear and the driven gear are mutually meshed in the gear cavity, and gear teeth of the driving gear and the driven gear respectively form a plurality of inter-tooth grooves with side walls on two sides of the gear cavity; an oil inlet and an oil outlet are formed in the pump body or the pump cover, low-pressure oil grooves are formed in the positions, corresponding to the oil inlet, of the pump body and the pump cover, high-pressure oil grooves are formed in the positions, corresponding to the oil outlet, of the pump body and the pump cover, and two shaft holes are formed in the pump body and the pump cover; the pump body or the pump cover are respectively provided with an annular oil groove around two shaft holes, each annular oil groove is outwards provided with a first oil groove and a second oil groove, the first oil groove is communicated with the high-pressure oil groove, the second oil groove extends to the position corresponding to the inter-tooth groove, and an interval is formed between the second oil groove and the high-pressure oil groove as well as between the second oil groove and the low-pressure oil groove.

In the technical scheme, high-pressure oil in the high-pressure oil groove can enter the second oil groove sequentially through the first oil groove and the annular oil groove, so that the pressure of an inter-tooth groove area can be increased; because the solubility of the air is in direct proportion to the pressure, the oil pressure of the inter-tooth grooves is increased, so that the solubility of the air can be improved, and meanwhile, the air dissociated from the oil is reduced, so that the cavitation erosion of the oil pump can be optimized, and the pressure fluctuation caused by local high pressure generated by the oil pump is reduced.

Preferably, the first oil groove is a straight groove.

Preferably, the second oil groove is fan-shaped or L-shaped.

Preferably, the distance between the second oil groove and the low-pressure oil groove is H1, the distance between the second oil groove and the high-pressure oil groove is H2, the width of the single inter-tooth groove is e, H1 is more than e, and H2 is more than or equal to e.

Preferably, the oil introduction inlet of the second oil sump is adjacent to the low pressure oil sump. The oil inlet of the second oil groove is designed to be close to the low-pressure oil groove, so that the bearing capacity of the bushing can be improved, and partial heat can be taken away, because the maximum bearing position of the bushing is also close to the low-pressure oil groove.

Drawings

Fig. 1 is a schematic diagram of an oil pump structure in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a pump cover structure according to an embodiment of the present invention;

the reference signs are:

1-pump body 2-pump cover 3-driving gear

4-driven gear 5-inter-tooth groove 6-annular oil groove

7-first oil sump 8-second oil sump.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

As shown in fig. 1 and 2, a gear type oil pump capable of optimizing cavitation erosion comprises a pump body 1, a pump cover 2, a driving gear 3, a driven gear 4, a driving shaft and a driven shaft, wherein a gear cavity for accommodating the driving gear 3 and the driven gear 4 is arranged on the pump body 1, the driving gear 3 and the driven gear 4 are mutually meshed in the gear cavity, and the gear teeth of the driving gear 3 and the driven gear 4 respectively form a plurality of inter-gear grooves 5 with the side walls of the two sides of the gear cavity; an oil inlet and an oil outlet are formed in the pump body 1 or the pump cover 2, low-pressure oil grooves are formed in the positions, corresponding to the oil inlet, of the pump body 1 and the pump cover 2, high-pressure oil grooves are formed in the positions, corresponding to the oil outlet, of the pump body 1 and the pump cover 2, and two shaft holes are formed in the pump body 1 and the pump cover 2; the pump body 1 or the pump cover 2 are respectively provided with an annular oil groove 6 around two shaft holes, each annular oil groove 6 is outwards provided with a first oil groove 7 and a second oil groove 8, the first oil groove 7 is communicated with a high-pressure oil groove, the second oil groove 8 extends to a position corresponding to an inter-tooth groove, and an interval is formed between the second oil groove 8 and the high-pressure oil groove and between the second oil groove and the low-pressure oil groove.

As shown in fig. 2, in the present embodiment, the first oil groove 7 is a straight groove, and the second oil groove 8 is a fan-shaped or L-shaped groove; the distance between the second oil groove 8 and the low-pressure oil groove is H1, and the distance between the second oil groove 8 and the high-pressure oil groove is H2; the oil introduction inlet of second oil sump 8 is close to the low pressure oil sump; as shown in FIG. 1, the width of a single inter-tooth slot 5 is e, H1 > e, H2 ≧ e.

In the embodiment, high-pressure oil in the high-pressure oil groove can enter the second oil groove 8 through the first oil groove 7 and the annular oil groove 6 in sequence, so that the pressure of the inter-tooth groove area can be increased; because the solubility of the air is in direct proportion to the pressure, the oil pressure of the inter-tooth grooves is increased, so that the solubility of the air can be improved, and meanwhile, the air dissociated from the oil is reduced, so that the cavitation erosion of the oil pump can be optimized, and the pressure fluctuation caused by local high pressure generated by the oil pump is reduced.

The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit and scope of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.