CN217273467U

CN217273467U - Two-stage press oil pump

Info

Publication number: CN217273467U
Application number: CN202221093381.9U
Authority: CN
Inventors: 安铭; 张林川; 刘建卫; 崔永
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-08-23
Anticipated expiration: 2032-05-09

Abstract

The utility model discloses a two-stage pressure engine oil pump, which comprises an engine oil pump body, wherein a first-stage pump oil gear set driven by an engine oil pump shaft is arranged in the engine oil pump body, one end of the engine oil pump body is provided with a pump cover, the engine oil pump body is provided with an oil suction port and a first-stage pump oil outlet, the other end of the engine oil pump body relative to the pump cover is provided with a second-stage pump body, a second-stage pump oil gear set driven by the engine oil pump shaft is arranged in the second-stage pump body, the second-stage pump oil outlet and a second-stage pump oil inlet are arranged on the second-stage pump body, and an oil passing port communicated with the second-stage pump oil inlet is arranged on the engine oil pump body; the axial outer side of the secondary pump body is provided with a pressure-limiting valve shell, the axial outer side wall of the secondary pump body is correspondingly provided with a secondary pump residual oil outlet and a secondary pump residual oil return opening which are communicated with the inner cavity of the pressure-limiting valve shell at intervals, and the inner cavity of the pressure-limiting valve shell is provided with a pressure-limiting valve for opening and closing the secondary pump residual oil outlet and the secondary pump residual oil return opening. The utility model discloses compact structure satisfies the lubrication pressure demand of different spare parts, and need not to increase extra oil pump.

Description

Two-stage press oil pump

Technical Field

The utility model relates to a two-stage press oil pump.

Background

The diesel engine oil pump provides lubricating oil with sufficient flow and pressure for each friction pair and parts of the diesel engine, but when the oil pressure required by a certain part of the engine is greater than the main oil duct pressure at the rotating speed, the flow of the oil pump needs to be increased to improve the pressure of the main oil duct of the engine, so that the oil pressure requirement of the high-pressure oil pump is met, and in order to avoid overlarge design of one oil pump, the oil pressure of the certain part needs to be improved by connecting another oil pump in series. In the prior art, the pressure of a main oil gallery is increased by increasing the flow of an engine oil pump, so that the leakage flow of the engine oil pump is large under a rated working condition, and the waste of the flow of the engine oil and the loss of the power of an engine are caused. And the mode of serially connecting two or more oil pumps for pressurization causes excessive parts, reduced reliability, insufficient space and difficult arrangement. The internal combustion engine is compact, optimized and improved while improving performance, the oil pump is used as a key component of a lubricating system of the internal combustion engine and determines the circulating lubricating oil quantity, the oil pump is mostly driven by engine transmission in the actual use process, and a built-in mounting form is adopted and is built in an oil pan or a front end cover, so the size of a mounting space in the axial direction is very limited, however, for the oil pump with a gear structure, the axial size of a pump oil gear is in direct proportion to the pump flow, and in order to supply enough circulating lubricating oil quantity, the axial size cannot be increased due to the limited space of the built-in oil pump.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a compact structure, satisfy the two-stage pressure machine oil pump of different spare parts to machine oil pressure demand simultaneously.

For solving the technical problem, the utility model discloses a pump body is equipped with the one-level pump oil gear train by pump shaft driven in the pump body, and pump body one of them end is equipped with the pump cover, is equipped with oil absorption mouth and one-level pump oil export on the pump body, and its structural feature is the pump body is equipped with the second grade pump body for the other end of pump cover, is equipped with in the second grade pump body by pump shaft driven second grade pump oil gear train, is equipped with second grade pump oil export and second grade pump oil entry on the second grade pump body, be equipped with the hydraulic fluid port of crossing that communicates second grade pump oil entry on the pump body.

The pressure limiting valve is arranged on the outer axial side of the secondary pump body, a secondary pump residual oil outlet and a secondary pump residual oil return port which are communicated with the inner cavity of the pressure limiting valve shell are correspondingly arranged on the outer axial side wall of the secondary pump body at intervals, and a pressure limiting valve for opening and closing the secondary pump residual oil outlet and the secondary pump residual oil return port is arranged in the inner cavity of the pressure limiting valve shell.

The pressure limiting valve comprises a plunger which is slidably arranged in an inner cavity of the pressure limiting valve shell, the shape of the plunger is matched with that of the inner cavity of the pressure limiting valve shell, a compression spring is arranged at one end, close to a residual oil return port of the secondary pump, of the plunger, and the other end of the compression spring is arranged on a spring seat which is connected to the outer portion of the pressure limiting valve shell in a sealing mode.

The secondary pump residual oil outlet and the secondary pump residual oil return port are arranged at an interval from top to bottom, and are respectively positioned on the upper side and the lower side of the shaft of the engine oil pump.

The pressure limiting valve shell is characterized in that an inner cavity of the pressure limiting valve shell is arranged up and down, the plunger is hollow with an opening at the lower end, the upper end of the compression spring extends into the inner cavity of the plunger, and the spring seat is located at the lower end of the pressure limiting valve shell.

The primary pump oil gear set comprises a driving gear and a driven gear, the driving gear is mounted on a pump shaft of the engine oil pump, the driven gear is meshed with the driving gear, and the driving gear and the driven gear are arranged in parallel front and back relative to each other; the secondary pump oil gear set comprises a secondary driving gear and a secondary driven gear, the secondary driving gear is mounted on the shaft of the engine oil pump, the secondary driven gear is meshed with the secondary driving gear, and the secondary driving gear and the secondary driven gear are arranged in parallel in the front and back directions relatively.

The oil suction port is positioned at the upper end of the oil pump body, and the primary pump oil outlet is positioned at the lower end of the oil pump body.

The secondary pump oil outlet is positioned at the upper end of the secondary pump body, and the secondary pump oil inlet is positioned at the lower end of the secondary pump body; the oil passing port is positioned at the lower end of the oil pump body.

After the structure is adopted, the secondary pump body is connected in series on the oil pump body, the secondary pump oil gear set driven by the oil pump shaft is arranged in the secondary pump body, the two pump oil gear sets form an oil pump assembly, the oil pump assembly and the oil suction port are formed, and the two oil outlets can pump the engine oil with different pressures.

Drawings

The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic axial view of the pump cover of FIG. 1 with the pump cover removed;

FIG. 3 is a schematic structural view of a two-stage pump body;

fig. 4 is a schematic left view of fig. 3.

Detailed Description

Referring to the attached drawings, the two-stage press oil pump comprises an oil pump body 1, a first-stage pump oil gear set 6 driven by an oil pump shaft 5 is arranged in the oil pump body 1, a pump cover 3 is arranged at one end of the oil pump body 1, a driving gear 4 is mounted on the oil pump shaft 5 on the outer side of the pump cover 3, an oil suction opening 7 and a first-stage pump oil outlet 11 are arranged on the oil pump body 1, a second-stage pump body 2 is arranged at the other end, opposite to the pump cover 3, of the oil pump body 1, a second-stage pump oil gear set 12 driven by the oil pump shaft 5 is arranged in the second-stage pump body 2, a second-stage pump oil outlet 9 and a second-stage pump oil inlet 8 are arranged on the second-stage pump body 2, an oil passing opening 10 communicated with the second-stage pump oil inlet 8 is arranged on the oil pump body 1, the oil pump body 1 and the second-stage pump body 2 are connected in series, and the oil pump shaft 5 extends into the second-stage pump body 2 from the oil pump body 1.

Referring to fig. 1 and 3, a pressure limiting valve housing 15 is arranged on the outer axial side of the secondary pump body 2, a secondary pump residual oil outlet 13 and a secondary pump residual oil return port 14 which are communicated with the inner cavity of the pressure limiting valve housing 15 are correspondingly arranged on the outer axial side wall of the secondary pump body 2 at intervals, a pressure limiting valve for opening and closing the secondary pump residual oil outlet 13 and the secondary pump residual oil return port 14 is arranged in the inner cavity of the pressure limiting valve housing 15, the secondary pump residual oil outlet 13 and the secondary pump residual oil return port 14 are arranged at intervals up and down, and the secondary pump residual oil outlet 13 and the secondary pump residual oil return port 14 are respectively positioned on the upper side and the lower side of the engine oil pump shaft 5. The pressure limiting valve comprises a plunger 16 which is slidably installed in an inner cavity of a pressure limiting valve shell 15, the shape of the plunger 16 is matched with that of the inner cavity of the pressure limiting valve shell 15, a compression spring 17 is arranged at one end, close to a residual oil return port 14, of the plunger 16, the other end of the compression spring 17 is installed on a spring seat 18 which is connected from the outside of the pressure limiting valve shell 15 in a sealing mode, the inner cavity of the pressure limiting valve shell 15 is arranged from top to bottom, a threaded hole for installing the spring seat 18 is formed in the lower end of the pressure limiting valve shell 15, the plunger 16 is in a hollow shape with an open lower end, the upper end of the compression spring 17 extends into the inner cavity of the plunger 16, and the spring seat 18 is installed in the threaded hole in the lower end of the pressure limiting valve shell 15.

Referring to fig. 1, 2 and 4, the primary oil pumping gear set 6 includes a driving gear mounted on the engine oil pump shaft 5 and a driven gear engaged with the driving gear, the driving gear and the driven gear are arranged in parallel front and back relative to each other, and the driven gear is supported and mounted on the pump wall of the engine oil pump body 1 through a driven gear shaft; the secondary pump oil gear group 12 comprises a secondary driving gear mounted on the engine oil pump shaft 5 and a secondary driven gear meshed with the secondary driving gear, the secondary driven gear is supported and mounted on the pump walls of the engine oil pump body 1 and the secondary pump body 2 through a driven gear shaft, and the secondary driving gear and the secondary driven gear are arranged in parallel in the front and at the back relatively. The oil suction opening 7 is positioned at the upper end of the oil pump body 1, and the primary pump oil outlet 11 is positioned at the lower end of the oil pump body 1; the secondary pump oil outlet 9 is positioned at the upper end of the secondary pump body 2, the secondary pump oil inlet 8 is positioned at the lower end of the secondary pump body 2, the secondary pump residual oil return port 14 is close to the secondary pump oil inlet 8, and the oil passing port 10 is correspondingly positioned at the lower end of the oil pump body 1 and communicated with the secondary pump oil inlet 8.

When the engine oil pump works, the engine gear drives a driving gear of the engine oil pump, and the driving gear simultaneously drives the first-stage pump oil gear set and the second-stage pump oil gear set to work through the engine oil pump shaft; the engine oil enters the primary pump oil gear set through the oil suction port to be subjected to primary pressurization, part of the engine oil enters the engine through the primary pump oil outlet, the other part of the engine oil enters the secondary pump oil gear set through the oil passing port after being pressurized by the primary pump oil gear set to be subjected to secondary pressurization, and then enters the other oil duct of the engine from the secondary pump oil outlet to lubricate parts requiring high engine oil pressure. When the pressure of the oil outlet of the secondary pump is too high, the engine oil pushes the pressure limiting valve to move, the residual oil outlet of the secondary pump is communicated with the residual oil return port of the secondary pump, and part of the engine oil at the oil outlet of the secondary pump returns to the oil inlet of the secondary pump, so that the situation that the oil pressure of the oil outlet of the secondary pump is too high is prevented, and meanwhile, the situation that the flow of the engine oil of the secondary pump is too large, and the flow of the oil outlet of the primary pump is too small is prevented.

The utility model discloses owing to have concatenated the second grade pump body on the oil pump body, be equipped with the second grade pump oil gear group by oil pump shaft driven in the second grade pump body, an oil pump assembly is constituteed to the two, an oil absorption mouth, and two oil-outs can pump the machine oil of different pressures, and its compact structure satisfies the lubricating pressure demand of different spare parts, and need not to increase extra oil pump to the loss of engine power has been reduced.

Claims

1. The two-stage press machine oil pump comprises an oil pump body (1), wherein a first-stage pump oil gear set (6) driven by an oil pump shaft (5) is arranged in the oil pump body (1), a pump cover (3) is arranged at one end of the oil pump body (1), an oil suction port (7) and a first-stage pump oil outlet (11) are arranged on the oil pump body (1), the two-stage press machine oil pump is characterized in that a second-stage pump body (2) is arranged at the other end, opposite to the pump cover (3), of the oil pump body (1), a second-stage pump oil gear set (12) driven by the oil pump shaft (5) is arranged in the second-stage pump body (2), a second-stage pump oil outlet (9) and a second-stage pump oil inlet (8) are arranged on the oil pump body (1), and an oil passing port (10) communicated with the second-stage pump oil inlet (8) is arranged on the oil pump body (1).

2. The two-stage pressure oil pump according to claim 1, characterized in that a pressure limiting valve housing (15) is arranged on the axial outer side of the secondary pump body (2), a secondary pump residual oil outlet (13) and a secondary pump residual oil return port (14) which are communicated with the inner cavity of the pressure limiting valve housing (15) are correspondingly arranged on the axial outer side wall of the secondary pump body (2) at intervals, and a pressure limiting valve for opening and closing the secondary pump residual oil outlet (13) and the secondary pump residual oil return port (14) is arranged in the inner cavity of the pressure limiting valve housing (15).

3. The two-stage pressure oil pump according to claim 2, characterized in that the pressure limiting valve comprises a plunger (16) slidably mounted in an inner cavity of the pressure limiting valve housing (15), the shape of the plunger (16) is adapted to the shape of the inner cavity of the pressure limiting valve housing (15), one end of the plunger (16) close to the residual oil return port (14) of the secondary pump is provided with a compression spring (17), and the other end of the compression spring (17) is mounted on a spring seat (18) externally sealed and connected into the pressure limiting valve housing (15).

4. The two-stage pressure oil pump according to claim 2, characterized in that the secondary pump residual oil outlet (13) and the secondary pump residual oil return port (14) are arranged at an interval from top to bottom, and the secondary pump residual oil outlet (13) and the secondary pump residual oil return port (14) are respectively positioned on the upper side and the lower side of the pump shaft (5) of the engine oil pump.

5. A two-stage pressure oil pump according to claim 3, characterized in that the pressure limiting valve housing (15) is arranged with its inner cavity arranged up and down, the plunger (16) is hollow with its lower end open, the upper end of the compression spring (17) extends into the inner cavity of the plunger (16), and the spring seat (18) is located at the lower end of the pressure limiting valve housing (15).

6. A two-stage pressure oil pump according to any of the claims 1-5, characterized in that the primary pump oil gear set (6) comprises a driving gear mounted on the pump shaft (5) of the engine oil and a driven gear engaged with the driving gear, the driving gear and the driven gear being arranged in parallel front and back opposite to each other; the secondary pump oil gear set (12) comprises a secondary driving gear and a secondary driven gear, the secondary driving gear is mounted on the engine oil pump shaft (5), the secondary driven gear is meshed with the secondary driving gear, and the secondary driving gear and the secondary driven gear are arranged in parallel in a front-back mode relatively.

7. A two-stage pressure oil pump according to any of claims 1 to 5, characterized in that the oil suction opening (7) is located at the upper end of the oil pump body (1) and the one-stage pump oil outlet (11) is located at the lower end of the oil pump body (1).

8. A two-stage pressure pump according to any of claims 1 to 5, characterized in that the secondary pump oil outlet (9) is located at the upper end of the secondary pump body (2) and the secondary pump oil inlet (8) is located at the lower end of the secondary pump body (2); the oil passing opening (10) is positioned at the lower end of the oil pump body (1).