Electric pre-oil-supply oil pump assembly for diesel engine

Abstract

The utility model discloses an electric pre-oil-supply oil pump assembly for a diesel engine. The electric pre-oil-supply oil pump assembly comprises a connecting support, a motor body, a connecting flange and an oil pump body. The connecting support comprises a support base and a connecting disc, the connecting disc is arranged on the support base, and the connecting disc comprises a mounting boss and a plurality of connecting threaded holes; the mounting boss is arranged on one side of the connecting disc; the multiple connecting threaded holes are evenly distributed and annularly formed in the edge of the connecting disc. The motor body is connected with the connecting disc through the mounting boss; the connecting flange is arranged on the other side of the connecting disc through a plurality of connecting threaded holes; one end of the oil pump body is fixedly connected with the connecting disc through the connecting flange; a motor shaft of the motor body is coaxially connected with an oil pump shaft of the oil pump body; the motor shaft drives the oil pump body to pump oil outwards through the oil pump shaft. Therefore, the motor power can be saved, the overall axial size is smaller, and the defects that threads are prone to loosening and oil leakage is caused are overcome.

Description

Technical Field

[0001] The utility model relates to the design and manufacturing field of diesel engines, in particular to an electric pre-fuel supply oil pump assembly for diesel engines. Background Art

[0002] The lubrication system of a diesel engine group provides sufficient lubricating oil to the friction surfaces of the engine to reduce wear and ensure its normal operation. The pre-supply oil pump of a diesel engine group is a very important part of the lubrication system. Generally, the pre-supply oil pump is divided into an electric pre-supply oil pump and a manual pre-supply oil pump. The function of the pre-supply oil pump of a diesel engine group is to pre-supply oil to the system before the engine starts to ensure that the friction surfaces are lubricated as necessary during the starting process.

[0003] The original structure of the electric pre-supply oil pump assembly for diesel engines in the prior art: First, the motor power matched with the pump of the same flow and pressure is generally 6 kW, which is obviously too large now. If a 2.2 kW motor is used, it can fully meet the use; second, the connecting shafts of the motor and the pump are extended and connected by a coupling (such as Figure 1 As shown, the motor body 1, the coupling 2, the oil pump body 3 and the threaded connection port 4) have too long dimensions; thirdly, the oil pump and the oil pipe of the original structure are threadedly connected, the diesel engine will vibrate when working, and the threaded connection is easy to loosen.

[0004] As engines become increasingly sophisticated, the contradiction between the increasing demand for engine power and the compact requirements for engine space volume layout is becoming increasingly fierce. Therefore, it is urgent to design a new electric pre-fuel pump assembly for diesel engines to overcome the above-mentioned problems existing in the prior art.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The purpose of the utility model is to provide an electric pre-fuel pump assembly for a diesel engine, which adopts a smaller power motor to drive the oil pump, and adopts a connecting flange instead of a coupling to achieve the connection between the motor and the oil pump, and replaces the thread with a flange to connect the oil pump and the oil pipe, so that the axial dimension is smaller, and the defects of easy loosening and oil leakage of the thread are overcome, and the motor power is saved.

[0007] To achieve the above-mentioned purpose, the utility model provides an electric pre-fuel pump assembly for a diesel engine, comprising a connecting bracket, a motor body, a connecting flange and an oil pump body; the connecting bracket comprises a bracket base and a connecting disc, the connecting disc is arranged on the bracket base, and the connecting disc comprises a mounting boss and a plurality of connecting threaded holes; the mounting boss is arranged on one side of the connecting disc; a plurality of connecting threaded holes are evenly distributed and arranged around the edge of the connecting disc; the motor body is connected to the connecting disc through the mounting boss; the connecting flange is arranged on the other side of the connecting disc through a plurality of connecting threaded holes; one end of the oil pump body is fixedly connected to the connecting disc through the connecting flange, and the motor shaft of the motor body is coaxially connected to the oil pump shaft of the oil pump body; wherein the motor shaft drives the oil pump body to pump oil outward through the oil pump shaft.

[0008] In a preferred embodiment, a center line connecting the plurality of connecting threaded holes forms a circle, and the center of the circle is not concentric with the center of the mounting boss.

[0009] In a preferred embodiment, the connecting bracket also includes a positioning bearing hole, which is arranged at the center of the mounting boss, and the output end of the motor shaft is arranged at the positioning bearing hole through a support bearing, and the input end of the oil pump shaft is coaxially connected to the output end of the motor shaft at the positioning bearing hole.

[0010] In a preferred embodiment, the connecting flange includes a central shaft hole, a positioning boss and a plurality of connecting through holes; the central shaft hole is arranged on the connecting flange, and the input end of the oil pump shaft passes through the central shaft hole and is coaxially connected to the output end of the motor shaft; the positioning boss is arranged on one side of the connecting flange, and concentric rings are arranged around the central shaft hole, and the positioning boss is used to insert one end of the positioning bearing hole and support the support bearing; the plurality of connecting through holes are evenly distributed and arranged around the edge of the connecting flange, and the positions and numbers of the plurality of connecting through holes match the positions and numbers of the plurality of connecting threaded holes.

[0011] In a preferred embodiment, a center line connecting the plurality of connecting through holes forms a circle, and the center of the circle is not concentric with the center axis hole and the center of the positioning boss.

[0012] In a preferred embodiment, the connecting flange further comprises a sealing groove, which is arranged on the inner wall of the central axis hole, and the sealing groove is used for installing a sealing ring.

[0013] In a preferred embodiment, the connecting bracket also includes at least two motor fixing holes and a weight-reducing ring groove; at least two motor fixing holes are symmetrically arranged at the edge of the mounting boss, and the centers of at least two motor fixing holes are arranged on the same circumference, and the center of the circle is concentric with the connecting disc; the weight-reducing ring groove is arranged on the side of the connecting disc facing the motor body, and is arranged around the periphery of the mounting boss.

[0014] In a preferred embodiment, the bracket base includes a bottom plate, a support plate, a reinforcing rib and a plurality of base mounting holes; the support plate is vertically arranged on the bottom plate, and the upper end of the support plate is fixedly connected to the outer circumference of the connecting disk; the reinforcing rib is arranged between one side surface of the support plate and the upper surface of the bottom plate, and is located on the side of the support plate facing the motor body; and the plurality of base mounting holes are arranged at the outer edge of the bottom plate.

[0015] In a preferred embodiment, the oil pump body includes an oil pump housing, a sealing gasket, an inner rotor and an outer rotor; one end of the oil pump housing is sealed and connected to a side of a connecting flange facing away from the motor body by connecting bolts through multiple connecting through holes and multiple connecting threaded holes; the sealing gasket is arranged between an end face of one end of the oil pump housing and a side of the connecting flange facing away from the motor body; the inner rotor is arranged inside the oil pump housing and is sleeved on the oil pump shaft, and the oil pump shaft drives the inner rotor to rotate through a semicircular key; the outer rotor is arranged inside the oil pump housing and is coupled to the inner rotor.

[0016] In a preferred embodiment, the oil pump body further includes an oil pump flange, which is disposed at the other end of the oil pump housing and is used to be connected to a lubrication system of the engine.

[0017] Compared with the prior art, the electric pre-oil pump assembly for diesel engines of the utility model has the following beneficial effects: the solution adopts a smaller power motor to drive the oil pump, saving manufacturing cost and operating cost; and adopts a connecting flange instead of a coupling to realize the connection between the motor and the oil pump, and only one bearing is used to support the output end of the motor shaft and the input end of the oil pump shaft at the same time, so that the overall length dimension of the whole assembly is shortened by 220 mm and the structure is more compact; and the connection between the oil pump and the oil pipe is connected with a flange instead of a thread, which overcomes the defects of easy loosening and oil leakage of the thread, and makes the structure and operation of the whole electric pre-oil pump assembly more stable, which deserves wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the planar structure of an electric pre-supply oil pump assembly according to an embodiment of the prior art;

[0019] Figure 2 It is a schematic diagram of the planar connection structure of the electric pre-fuel supply oil pump assembly according to one embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the front structure of an oil pump flange according to an embodiment of the utility model;

[0021] Figure 4 It is a bottom view structural schematic diagram of a bracket base according to an embodiment of the utility model;

[0022] Figure 5It is a schematic diagram of the planar structure of an electric pre-fuel supply oil pump assembly according to an embodiment of the utility model;

[0023] Figures 6 to 8 It is a schematic diagram of the planar structure of a connecting bracket according to an embodiment of the utility model;

[0024] Figures 9 and 10 It is a schematic diagram of the planar structure of a connecting flange according to an embodiment of the utility model.

[0025] Description of main reference numerals:

[0026] 1-motor body, 101-motor shaft, 2-connecting bracket, 201-bracket base, 2011-bottom plate, 2012-support plate, 2013-reinforcement rib, 2014-base mounting hole, 202-connecting disc, 203-mounting boss, 204-connecting threaded hole, 205-positioning bearing hole, 206-motor fixing hole, 207-weight reduction ring groove, 3-connecting flange, 301-center shaft hole, 302-positioning boss, 303-connecting through hole, 304-sealing groove, 4-connecting bolt, 5-oil pump body, 501-oil pump shaft, 502-semicircle key, 503-inner rotor, 504-outer rotor, 505-sealing pad, 506-oil pump flange, 6-sealing ring. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0028] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0029] like Figures 2 to 5As shown, according to a preferred embodiment of the utility model, an electric pre-fuel pump assembly for a diesel engine includes a connecting bracket 2, a motor body 1, a connecting flange 3 and an oil pump body 5; the connecting bracket 2 includes a bracket base 201 and a connecting disc 202, the connecting disc 202 is arranged on the bracket base 201, and the connecting disc 202 includes a mounting boss 203 and a plurality of connecting threaded holes 204; the mounting boss 203 is arranged on one side of the connecting disc 202; a plurality of connecting threaded holes 204 are evenly distributed and annularly arranged at the edge of the connecting disc 202; the motor body 1 is connected to the connecting disc 202 through the mounting boss 203; the connecting flange 3 is arranged on the other side of the connecting disc 202 through a plurality of connecting threaded holes 204; one end of the oil pump body 5 is fixedly connected to the connecting disc 202 through the connecting flange 3, and the motor shaft 101 of the motor body 1 is coaxially connected with the oil pump shaft 501 of the oil pump body 5; wherein the motor shaft 101 drives the oil pump body 5 to pump oil outward through the oil pump shaft 501. The connecting disc 202 and the mounting boss of this embodiment both adopt a disc structure, but the present invention is not limited thereto, and other shapes such as polygonal or elliptical structures may also be adopted.

[0030] like Figures 6 to 8 As shown, in some embodiments, a tight clearance fit or interference fit may be adopted between the mounting boss 203 of this embodiment and the mounting hole of the motor, for example Figure 7 The outer diameter of the mounting boss 203 is shown as The surface finish is 1.6 to ensure the coaxiality between the motor and the connecting bracket 2.

[0031] like Figures 9 and 10 As shown, in some embodiments, the size of the positioning boss 302 of the connecting flange 3 can also be The surface finish is 3.2 to ensure the coaxial positioning between the positioning boss 302 and the positioning bearing hole 205 of the connecting bracket 2.

[0032] In some embodiments, the center line of the plurality of connecting threaded holes 204 forms a circle, the center of the circle is not concentric with the center of the mounting boss 203, and the center deviation is 4.75±0.015. The center deviation is only for illustration and the present invention is not limited thereto.

[0033] See also Figures 6 to 8 In some embodiments, the connecting bracket 2 also includes a positioning bearing hole 205, and the positioning bearing hole 205 is arranged at the center of the mounting boss 203. The output end of the motor shaft 101 is arranged at the positioning bearing hole 205 through a support bearing, and the input end of the oil pump shaft 501 is coaxially connected to the output end of the motor shaft 101 at the positioning bearing hole 205. Here, the input end of the oil pump shaft 501 and the output end of the motor shaft 101 are supported by only one support bearing, which can greatly reduce the cost and axial dimension control.

[0034] See also Figures 9 and 10 In some embodiments, the connecting flange 3 includes a central axis hole 301, a positioning boss 302 and a plurality of connecting through holes 303; the central axis hole 301 is arranged on the connecting flange 3, and the input end of the oil pump shaft 501 passes through the central axis hole 301 and is coaxially connected to the output end of the motor shaft 101; the positioning boss 302 is arranged on one side of the connecting flange 3, and concentric rings are arranged around the central axis hole 301, and the positioning boss 302 is used to insert one end of the positioning bearing hole 205 and support the supporting bearing; a plurality of connecting through holes 303 are evenly distributed and arranged at the edge of the connecting flange 3, and the positions and numbers of the plurality of connecting through holes 303 match the positions and numbers of the plurality of connecting threaded holes 204.

[0035] In some embodiments, the center line of the plurality of connecting through holes 303 forms a circle, the center of the circle is not concentric with the center of the central shaft hole 301 and the positioning boss 302 , and the center deviation matches the eccentricity difference between the connecting disk 202 and the mounting boss 203 .

[0036] In some embodiments, the connecting flange 3 further includes a sealing groove 304, which is arranged on the inner wall of the central shaft hole 301. The sealing groove 304 is used to install a sealing ring 6, which prevents the lubricating oil in the oil pump from leaking to the supporting bearing side.

[0037] See also Figures 6 to 8 In some embodiments, the connecting bracket 2 also includes at least two motor fixing holes 206 and a weight-reducing annular groove 207; at least two motor fixing holes 206 are symmetrically arranged at the edge of the mounting boss 203, and the centers of at least two motor fixing holes 206 are arranged on the same circumference, the center of the circle is concentric with the connecting disc 202, and the motor fixing holes 206 are used for fixed connection between the motor body and the connecting bracket to limit the axial movement of the motor body; the weight-reducing annular groove 207 is arranged on the side of the connecting disc 202 facing the motor body 1, and is arranged on the periphery of the mounting boss 203, and the weight-reducing annular groove 207 is used to reduce the overall weight of the connecting bracket 2, and the connecting bracket 2 can adopt metal casting, forging or welding and other manufacturing processes.

[0038] In some embodiments, the bracket base 201 includes a base plate 2011, a support plate 2012, a reinforcing rib 2013 and a plurality of base mounting holes 2014; the support plate 2012 and the base plate 2011 are vertically arranged on the base plate 2011, and the upper end of the support plate 2012 is fixedly connected to the outer circumference of the connecting disk 202; the reinforcing rib 2013 is arranged between one side surface of the support plate 2012 and the upper surface of the base plate 2011, and is located on the side of the support plate 2012 facing the motor body 1; a plurality of base mounting holes 2014 are arranged at the outer edge of the base plate 2011, and the base mounting holes 2014 are used for the installation of the entire electric pre-oil pump assembly.

[0039] See also Figure 5 In some embodiments, the oil pump body 5 includes an oil pump housing, a sealing gasket 505, an inner rotor 503 and an outer rotor 504; one end of the oil pump housing is sealed and connected to a side of the connecting flange 3 facing away from the motor body 1 by a connecting bolt 4 through a plurality of connecting through holes 303 and a plurality of connecting threaded holes 204; the sealing gasket 505 is arranged between an end face of the oil pump housing and a side of the connecting flange 3 facing away from the motor body 1, and the sealing gasket 505 is used to prevent the lubricating oil in the oil pump from leaking out of the oil pump housing; the inner rotor 503 is arranged inside the oil pump housing and sleeved on the oil pump shaft 501, and the oil pump shaft 501 drives the inner rotor 503 to rotate through a semicircular key 502; the outer rotor 504 is arranged inside the oil pump housing and coupled with the inner rotor 503. This embodiment takes a rotor pump as an example, but the utility model is not limited thereto.

[0040] In some embodiments, the oil pump body 5 also includes an oil pump flange 506, which is arranged at the other end of the oil pump housing. The oil pump flange 506 is used to connect to the oil pipe of the engine's lubrication system. The use of flange connection can overcome the defect that the threaded connection is easy to loosen and cause oil leakage.

[0041] In summary, the electric pre-oil pump assembly for diesel engines of the utility model has the following advantages: this solution uses a smaller power motor to drive the oil pump to save manufacturing cost and operating cost; and adopts a connecting flange instead of a coupling to realize the connection between the motor and the oil pump, and only one bearing is used to support the output end of the motor shaft and the input end of the oil pump shaft at the same time, so that the overall length of the entire assembly is shortened by 220 mm and the structure is more compact; and the connection between the oil pump and the oil pipe is connected with a flange instead of a thread, which overcomes the defects of easy loosening and oil leakage of the thread, and makes the structure and operation of the entire electric pre-oil pump assembly more stable, which deserves wide promotion.

[0042] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. An electric pre-fuel pump assembly for a diesel engine, characterized in that: include: A connecting bracket, comprising a bracket base and a connecting disc, wherein the connecting disc is arranged on the bracket base, and the connecting disc comprises: A mounting boss, which is arranged on one side of the connecting disc; and A plurality of connecting threaded holes are evenly distributed around the edge of the connecting disc; A motor body connected to the connecting disc via a mounting boss; a connecting flange, which is disposed on the other side of the connecting disc through the plurality of connecting threaded holes; and An oil pump body, one end of which is fixedly connected to the connecting disc via the connecting flange, and a motor shaft of the motor body is coaxially connected to an oil pump shaft of the oil pump body; The motor shaft drives the oil pump body to pump oil outwards through the oil pump shaft.

2. The electric pre-fuel pump assembly for a diesel engine according to claim 1, characterized in that: The center lines of the plurality of connecting threaded holes form a circle, and the center of the circle is not concentric with the center of the mounting boss.

3. The electric pre-fuel pump assembly for a diesel engine according to claim 2, characterized in that: The connecting bracket also includes a positioning bearing hole, which is arranged at the center of the mounting boss. The output end of the motor shaft is arranged at the positioning bearing hole through a support bearing, and the input end of the oil pump shaft is coaxially connected to the positioning bearing hole with the output end of the motor shaft.

4. The electric pre-fuel pump assembly for a diesel engine as claimed in claim 3, characterized in that: The connecting flange comprises: A central shaft hole, which is arranged on the connecting flange, and the input end of the oil pump shaft passes through the central shaft hole and is coaxially connected with the output end of the motor shaft; A positioning boss, which is arranged on one side of the connecting flange, and a concentric ring is arranged around the central shaft hole, and the positioning boss is used to be inserted into one end of the positioning bearing hole and abut against the support bearing; and A plurality of connecting through holes are evenly distributed around the edge of the connecting flange, and the positions and numbers of the plurality of connecting through holes match the positions and numbers of the plurality of connecting threaded holes.

5. The electric pre-fuel pump assembly for a diesel engine as claimed in claim 4, characterized in that: The center lines connecting the plurality of connecting through holes form a circle, the center of which is not concentric with the center of the central shaft hole and the center of the positioning boss.

6. The electric pre-fuel pump assembly for a diesel engine as claimed in claim 4, characterized in that: The connecting flange also includes a sealing groove, which is arranged on the inner wall of the central axis hole, and the sealing groove is used for installing a sealing ring.

7. The electric pre-fuel pump assembly for a diesel engine as claimed in claim 4, characterized in that: The connecting bracket also includes: at least two motor fixing holes, which are symmetrically arranged around the edge of the mounting boss, and the centers of the at least two motor fixing holes are arranged on the same circumference, and the center of the circumference is concentric with the connecting disc; and A weight-reducing annular groove is arranged on a side of the connecting disc facing the motor body and is arranged around the periphery of the mounting boss.

8. The electric pre-fuel pump assembly for a diesel engine according to claim 4, characterized in that: The support base comprises: Base plate; A support plate, which is arranged on the bottom plate vertically, and the upper end of the support plate is fixedly connected to the outer circumference of the connecting disk; A reinforcing rib, which is disposed between a side surface of the support plate and an upper surface of the bottom plate and is located on a side of the support plate facing the motor body; and A plurality of base mounting holes are disposed at the outer edge of the base plate.

9. The electric pre-fuel pump assembly for a diesel engine according to claim 4, characterized in that: The oil pump body comprises: An oil pump housing, one end of which is sealedly connected to a side of the connecting flange facing away from the motor body by connecting bolts through the multiple connecting through holes and the multiple connecting threaded holes; A sealing gasket, which is arranged between an end surface of the oil pump housing and a surface of the connecting flange facing away from the motor body; an inner rotor, which is arranged inside the oil pump housing and sleeved on the oil pump shaft, and the oil pump shaft drives the inner rotor to rotate through a semicircular key; and The outer rotor is arranged inside the oil pump housing and is coupled with the inner rotor.

10. The electric pre-fuel pump assembly for a diesel engine according to claim 9, characterized in that: The oil pump body further comprises an oil pump flange, which is arranged at the other end of the oil pump housing, and the oil pump flange is used to be connected to the lubrication system of the engine.

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