CN111188768A

CN111188768A - Oil pump

Info

Publication number: CN111188768A
Application number: CN202010157022.4A
Authority: CN
Inventors: 杨鲁川
Original assignee: Changzhou Grand Pump Co Ltd
Current assignee: Changzhou Grand Pump Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-05-22

Abstract

The invention relates to an oil pump comprising: the end cover, the base, the driving gear and the driven gear; the end cover is connected with the base to form an inner cavity, and the driving gear and the driven gear are meshed with each other and are arranged in the inner cavity; the end cover and the base are formed by connecting a plurality of stamping plates in a stacking mode. According to the oil pump, an integrated structure of the base and the end cover is divided into a structure formed by laminating and connecting a plurality of layers of stamping plates, and furthermore, avoidance grooves for avoiding protruding structures such as burrs and the like are manufactured on the corresponding side surfaces of the stamping plates. Based on the structural arrangement of the engine oil pump, the structural shapes and the dimensional accuracies of the base and the end cover in the engine oil pump are ensured, the matching accuracy of the engine oil pump and other components is higher, the surface smoothness requirement is met, the engine oil pump is easy to manufacture, the product cost is obviously reduced, the production efficiency is high, the economic performance of the product is improved, and the product has higher competitiveness in the aspect of price.

Description

Oil pump

Technical Field

The present invention relates to an oil pump.

Background

The gear-type oil pump generally includes an end cap and a base, which are assembled to form a cavity therein for receiving a driving gear of the oil pump and a driven gear engaged therewith. In addition, the end cover and the base are generally provided with hydraulic oil paths with complex shapes.

Since the drive gear and the driven gear are in a state of rotating at a high speed in the internal cavity during operation, relatively high requirements are placed on the dimensional accuracy and the surface finish of the internal cavity, and also on the dimensional accuracy and the surface finish of the mounting surface for mounting the end cover and the base and the mounting surface for mounting the base and the engine, the transmission case, and the like.

In addition, in order to meet some special performance requirements, structures for providing passages, oil passages and other functions on the base and the end cover of the oil pump are sometimes needed.

In the prior art, in order to take account of the dimensional accuracy, the surface finish and the manufacturing cost of the product, the end cover and the base of the oil pump are manufactured by die casting and then machining. The specific manufacturing process comprises the following steps: firstly, manufacturing blanks of the end cover and the base by using an aluminum alloy material through a casting process; secondly, machining the mounting surfaces of the end cover and the base through a milling machine; turning the inner hole of the end cover, the side walls of the high-pressure chamber and the low-pressure chamber and the side walls of the oil inlet and the oil outlet of the base through a lathe, turning or hinging the shaft hole, and positioning the workpiece by using an eccentric tool at the moment. And fourthly, processing special structures such as passages, oil passages and the like, such as drilling holes, which are limited by various conditions, and sometimes needing to be inclined or even turned in the middle.

In the manufacturing and machining process, machining equipment such as a milling machine, a lathe and the like needs to be used, special fixtures for machining each machining part are needed, parts need to be rolled between different machine tools, a workpiece needs to be turned over when two mounting surfaces of a base are machined on the milling machine, and different fixtures need to be replaced on different machine tools.

Besides time-consuming turning and milling, the rejection rate is high.

When a special structure, such as an inclined hole and a path turning halfway, is processed, a special tool clamp needs to be arranged and manufactured, and even the structure and the shape of a part are limited, a hole for processing needs to be made first, the path is processed, and then the hole for processing needs to be plugged.

Therefore, the manufacturing process has the defects of multiple links, long flow time, low production efficiency and high cost, so that the price of parts of the oil pump is high, and the price competitiveness of the final oil pump product is low.

Disclosure of Invention

The invention aims to solve the problems and provide an oil pump which can meet the requirements of dimensional accuracy and surface smoothness, is easy to manufacture and has low cost.

To achieve the above object, the present invention provides an oil pump including: the end cover, the base, the driving gear and the driven gear;

the end cover is connected with the base to form an inner cavity, and the driving gear and the driven gear are meshed with each other and are arranged in the inner cavity;

the end cover and/or the base are formed by laminating and connecting a plurality of stamping plates.

According to one aspect of the invention, one side of the punching plate is provided with an avoiding groove for avoiding the protruding structure on the other punching plate connected with the avoiding groove.

According to an aspect of the present invention, a protrusion is provided on a side of the punched plate material opposite to the escape groove;

the size of the protrusion is smaller than that of the avoidance groove.

According to one aspect of the invention, the depth of the avoidance groove is 9% to 85% of the thickness of the punched sheet material.

According to an aspect of the invention, the depth of the avoidance groove is 15% to 60% of the thickness of the punched sheet material.

According to an aspect of the invention, the evasion groove and/or the protrusion are stamped and formed.

According to an aspect of the invention, the avoidance groove is similar in shape to the projection.

According to one aspect of the present invention, the protruding structure is a burr generated when the punched plate is subjected to press forming.

According to the invention, the end cover and the base are formed by laminating and connecting multiple layers of punching plates, so that the technical problems in the prior art can be solved. Furthermore, when the punched plates are stacked, protruding structures such as burrs and the like are inevitably generated on the punched plates, and aiming at the problem, the invention manufactures the avoiding groove for avoiding the protruding structures such as the burrs and the like on the corresponding side surface of the punched plates, so that the influence of the structures such as the burrs and the like on the stacking precision is further solved.

By adopting the scheme of the invention, the plate is cut, formed and then laminated and connected only by the stamping process, and the parts meeting the requirements of dimensional accuracy and surface smoothness can be manufactured without casting a blank in the early stage and turning and milling after stamping forming, so that the casting, turning and milling processes are reduced, the process links are few, required equipment, sites and personnel are greatly reduced, and the manufacturing process is extremely simple.

Because the casting link is omitted, a large amount of power consumption inevitably generated in the traditional manufacturing process due to casting and the problem of waste gas treatment generated by melting of aluminum ingots can be avoided in the production process of the oil pump product.

Because the workpiece does not need to be rolled between different machine tools and stations, the reduction of the positioning precision and the reduction of the part machining precision caused by the reduction of the positioning precision can be avoided, the manufacturing process flow of a single part can be reduced, and the process time is shortened.

Because the parts do not need to be carried for many times, the space for intermediate storage can be saved, and the risk of workpiece damage caused by carrying can be reduced.

And the turning and milling are not needed after the punch forming, so that the rejection rate of the workpiece can be reduced.

According to the scheme of the invention, due to the stamping processing adopted by the product manufacturing, compared with a series of processing of casting, turning and milling required by the product manufacturing process in the prior art, the processing time of the parts can be greatly shortened, and therefore, the production efficiency of the parts can be greatly improved.

Therefore, compared with the prior art, the scheme of the invention can greatly improve the production efficiency and greatly reduce the manufacturing cost.

By adopting the scheme of the invention, the end cover and the base can be manufactured by using the steel plate as the raw material, and compared with the aluminum alloy material used in the prior art, the raw material cost of the oil pump product can be greatly reduced.

Therefore, according to the scheme of the invention, the cost of the parts can be greatly reduced, and the production efficiency of the parts is improved, so that the economic performance of the product is improved, and the product has higher competitiveness in the aspect of price.

In addition, by adopting the scheme of the invention, extremely complex product appearance and internal structure can be combined by changing the structure and the shape of the punching sheets on different heights in the axial direction, and the performance of the product is improved. For example, complex shaped passages and flow channels can be constructed, which can give new functionality to the product.

Drawings

Fig. 1 is a sectional view schematically showing the structure of a conventional motor oil pump;

fig. 2 schematically shows a construction of an oil pump according to an embodiment of the invention;

fig. 3 schematically shows a configuration diagram of an oil pump according to another embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Fig. 1 schematically shows a structural cross-sectional view of a conventional motor oil pump. As shown in fig. 1, a base a, which functions to support the entire oil pump, and an end cover X, which supports a rotating shaft C thereon, are integrally formed in a conventional motor oil pump, i.e., are each a single member. The base A and the end cover X are connected to form an inner cavity for accommodating a driving gear of the oil pump and a driven gear meshed with the driving gear. Since the two gears rotate at high speed when the oil pump works, the internal cavity for accommodating the two gears is required to have higher dimensional accuracy and surface smoothness in order to ensure the product performance, reduce the abrasion and prolong the service life of the product. Therefore, the conventional manufacturing process usually includes manufacturing the blank by a die casting process, and then performing machining processes such as turning, milling, reaming, etc. on the blank. The product manufactured by the process has long manufacturing period and low production efficiency, so the manufacturing cost is high and the product price is high. In addition, as can be seen from fig. 1, the base a and the end cover X generally have relatively complicated internal structures, because the base and the end cover in the oil pump generally have structures such as passages, oil inlets and oil outlets therein, and structures with special shapes or positions, such as inclined holes (inclined portions in the oil inlets and the oil outlets in the drawing) on the end cover and the base in fig. 1, besides the supporting function, it is difficult to see that these structures are difficult to be formed by the previous casting process, and both need to be machined at the later stage, and the machining process not only needs a special tooling fixture, but also has low production efficiency, large investment and long time consumption.

The above is merely an example of one motor oil pump in the prior art, and the general oil pump has the above-described problems in that the end cover and the base constituting the oil pump portion are manufactured by casting and machining processes, which are complicated in process, low in production efficiency, and therefore high in manufacturing cost, in addition to the motor oil pump.

In order to solve the above-mentioned defects of the conventional oil pump shown in fig. 1, the base and the end cover of the oil pump are redesigned, and the base and the end cover of the oil pump are formed by laminating and connecting a plurality of sheet material structures, so that the raw material cost and the die cost can be reduced, the production efficiency can be greatly improved, and the processing cost can be greatly reduced. Meanwhile, the structural surface finish and the dimensional accuracy of the base and the end cover, particularly the inner cavity of the base and the end cover, can be effectively ensured. Because the base and the end cover are formed by stacking a plurality of layers of plate structures, the adopted raw material is a steel plate, the surface finish of the connecting surface is from the raw material per se, and further milling is not needed; the adopted processing technology is stamping, the hole wall processed by stamping can completely meet the requirements of the high-speed rotation of the gear accommodated in the hole wall on the size precision and the surface finish of the processed surface, the processing procedures of turning, milling, reaming and the like are not needed, after the single-piece component is punched, the required stamped pieces are directly laminated and connected in the modes of bonding, riveting, welding and the like, and the parts meeting the requirements can be obtained. By adopting the laminated structure, in addition to the improvement of the productivity and the reduction of the cost, under the condition that the installation size and the shape are limited, the extremely complex product appearance can be combined by changing the structure and the shape of the punching sheets on different heights in the axial direction, and the installation performance of the product is improved. When a passage and a flow channel which are complex in shape and even cannot be machined by other means need to be constructed, any internal structure is freely combined, the design freedom degree is improved, and even new functions are given to the product.

Further, in the invention, the base and the end cover are formed by laminating a plurality of layers of plates, and each plate structure is formed by stamping, so that the cost can be effectively saved. However, burrs are generated on the respective plate materials during the punching process, and the burrs extend in the punching direction. When the structural burr that appears of panel, will influence the cooperation precision between each panel structure when range upon range of each panel structure certainly for the shape size of base receives the influence. In order to further solve the technical problem, the burr avoiding structure is arranged on the corresponding plate structure, so that the deburring process can be omitted, for example, the stamping direction of the plate is from bottom to top, the direction of the burrs on the upper surface of the plate extends upwards, and the burr avoiding structure is arranged on the lower surface of the plate above the burr avoiding structure, so that the burrs can be contained in the burr avoiding groove, and the influence on the laminated connection between the two plate structures is avoided.

Fig. 2 schematically shows a configuration diagram of an oil pump according to an embodiment of the present invention. As shown in fig. 2, this oil pump is a motor oil pump, and in the present embodiment, the motor oil pump includes an oil pump portion 1 and other portions other than the oil pump. In the present embodiment, the other part includes a motor part 3 and a control part 2, and the motor part 3 includes a stator 301, a rotor 302 fitted to the stator 301, and a rotating shaft 303 connected to the rotor 302. The control portion 2 includes a wiring board 201 electrically connected to the stator 301 and an electrical connection port 202 for connecting an external power source. As shown in fig. 2, in the present embodiment, the oil pump portion 1 includes a base 101 serving as a system support, an end cover 102 supported on the base 101 and supporting a rotating shaft 303, and a driving gear 103 and a driven gear 104 disposed in an inner cavity formed by the base 101 and the end cover 102 and engaged with each other, and as can be seen from fig. 2, the end cover 102 and the base 101 are formed by laminating and connecting a plurality of punched plates 1011.

When good liquid sealing performance is required, a sealing structure, such as a film, a coating, or the like having a sealing function, may be provided between the respective punched plate materials.

Therefore, in the embodiment, the plate is cut and formed by the stamping process and then is connected in a laminated manner, and the parts meeting the requirements of dimensional accuracy and surface smoothness can be manufactured without casting a blank in the early stage and turning and milling after stamping forming, so that the casting, turning and milling processes are reduced, the process links are few, required equipment, sites and personnel are greatly reduced, and the manufacturing process is extremely simple.

Because each punching sheet can be directly stacked and connected according to a certain rule after stamping processing, and a workpiece does not need to be rolled between different machine tools and stations, the reduction of the positioning precision and the reduction of the part processing precision caused by the reduction can be avoided, the manufacturing process flow of a single part can be reduced, the processing time of the part is greatly shortened, and the production efficiency of the part is greatly improved.

In addition, in the present embodiment, the end cap and the base can be manufactured using a steel plate as a material, and the material cost of the product can be significantly reduced as compared with a component manufactured using an aluminum alloy material.

In summary, according to the present embodiment, the component cost can be greatly reduced, and the component production efficiency can be improved, so that the economic performance of the product can be improved, and the product has a competitive power in terms of price.

In addition, by adopting the invention, extremely complex product appearance and internal structure can be freely combined by changing the structure and shape of the punching sheets on different axial heights, thus not only improving the product design freedom and the product installation performance, but also endowing the product with new functions.

FIG. 3 schematically illustrates a block diagram of portions of a base, an end cap, a drive gear, and a driven gear in accordance with another embodiment of the present invention. As shown in fig. 3, in the present embodiment, the base 101 and the end cap 102 are each formed by laminating and connecting a plurality of press plates 1011. Machining burrs are inevitably generated when the punched plate 1011 is manufactured, and in some cases, in order to improve the performance of the oil pump, it is necessary to further improve the dimensional accuracy, and it is necessary to remove the burrs. The burrs may be removed by a conventional method, and for example, the burrs may be removed when the punching sheets 1011 are stacked or when the punching sheets 1011 are connected. In order to further improve the production efficiency, in the present embodiment, an avoiding groove F for avoiding a projecting structure E (e.g., a burr) that affects the fitting accuracy is provided on the lower side of each of the punched plate materials 1011. In the present embodiment, the punching direction of each punched plate is from bottom to top, and therefore the avoiding groove F is provided on the lower surface of the corresponding punched plate to avoid the burr protruding upward. Of course, when the punching direction is from top to bottom, and the burr direction stretches out downwards along with the punching direction, the avoiding groove F is arranged on the upper surface of the punching plate.

In the present embodiment, as shown in fig. 3, the other side of the pressed plate 1011 corresponding to the escape groove F has a protrusion G, and the shape of the protrusion G is similar to that of the escape groove F, and this structure is provided because the escape groove F in the present embodiment is similarly formed by press forming, and when the plate is pressed, since the plate is thin, one side surface has a groove structure, and the other side surface has a protrusion structure. And protruding G's size can be less than the size of dodging groove F a little, and this is because during the punching press, power is concentrated in dodging groove department for the deformation of dodging the groove is than bellied shape grow, utilizes this characteristics, and when making protruding G cooperate with dodging groove F on another punching press panel, can perfect embedding, can not influence the cooperation precision. In the embodiment, the groove F is avoided by molding, so that the process of removing burrs can be omitted, the time and cost are saved, and the precision of the product is ensured, so that the base disclosed by the invention has the advantages of convenience and rapidness in manufacturing and substantial cost saving on the basis of solving the technical problems.

Furthermore, in the embodiment, the avoiding groove can also store engine oil to ensure the lubricating effect, and meanwhile, impurities and friction scraps can be accumulated, so that the faults of the mechanism can be reduced, and the reliability of the product is improved.

In addition, when the respective punched plates 1011 are stacked and connected, the protrusions G and the escape grooves F can also play a role in assisting positioning and reinforcing connection.

The depth of the avoiding groove F is 9% -85% of the thickness of the punched plate, when the depth is lower than 9%, the effect of completely accommodating burrs is difficult to achieve, when the depth is higher than 85%, the punching processing is not facilitated, and the dimensional precision and the yield are difficult to ensure. In order to achieve both avoidance and positioning effects, the depth of the avoidance groove F is preferably 15% to 60% of the thickness of the punched plate.

In the present invention, the above-described structure of the base and the end cover in fig. 3 is equally applicable to, for example, the electric motor oil pump in fig. 2, and a corresponding technical effect is obtained.

In view of the above, the present invention can solve the above-mentioned technical problems of the prior art by dividing the integrated structure of the end cap and the base into a multi-layer punched plate structure and connecting them in a stacked manner. Furthermore, when the punched plates are stacked, protruding structures such as burrs and the like are inevitably generated on the punched plates, and in order to solve the problem, the invention manufactures the avoiding groove for avoiding the protruding structures such as the burrs and the like on the corresponding side surface of the punched plates, so that the influence of the structures such as the burrs and the like on the stacking precision is further solved, the process of removing the burrs can be omitted, the processing time is further shortened, and the production rate is improved. In addition, the avoiding structure can also have the functions of storing engine oil, guaranteeing lubrication and assisting in positioning and reinforcing connection.

Based on the arrangement, the oil pump can greatly shorten the processing period, improve the production efficiency and reduce the cost of parts, thereby improving the economic performance of products and ensuring that the products have higher competitiveness in the aspect of price.

The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be those of ordinary skill in the art and are intended to be implemented in such conventional ways.

The above description is only one 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. An oil pump comprising: the end cover, the base, the driving gear and the driven gear;

the end cover and/or the base are/is formed by laminating and connecting a plurality of stamping plates.

2. The oil pump of claim 1, wherein one side of the punching plate is provided with an avoiding groove for avoiding a protruding structure on the other punching plate connected with the one side of the punching plate.

3. The oil pump of claim 2, wherein a projection is provided on the punched plate material on a side opposite to the avoiding groove;

the size of the protrusion is smaller than that of the avoidance groove.

4. The oil pump of claim 2, wherein the depth of the relief groove is 9-85% of the thickness of the stamped sheet material.

5. The oil pump of claim 4, wherein the depth of the avoidance groove is 15% to 60% of the thickness of the stamped sheet material.

6. The oil pump according to claim 3, wherein the avoiding groove and/or the protrusion are formed by press molding.

7. The oil pump of claim 3, wherein the avoidance groove is shaped similarly to the projection.

8. The oil pump according to any one of claims 2 to 7, wherein the protruding structure is a burr generated when the stamped sheet material is subjected to press forming.