CN210068353U

CN210068353U - Integrated oil transfer pump of heavy diesel engine

Info

Publication number: CN210068353U
Application number: CN201920453295.6U
Authority: CN
Inventors: 林浩; 严波; 李智; 陈功军; 向辉
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-02-14
Anticipated expiration: 2029-04-04

Abstract

An integrated oil transfer pump of a heavy diesel engine comprises a driving gear flange, a pump body, a pump cover and an oil liquid driving structure arranged in the pump body, wherein an oil inlet and an oil outlet are formed in one side of the pump body; an engine main oil return pipe is arranged on the other side of the pump body, the outer end of the engine main oil return pipe is communicated with an oil tank through a pipeline, the inner end of the engine main oil return pipe is communicated with a cavity where an oil liquid driving structure in the pump body is located through an overflow valve, a whole vehicle oil return branch pipe with a throttling hole is arranged on the pipe wall outside the overflow valve in the engine main oil return pipe, and the whole vehicle can be communicated with the outer end of the branch pipe and the oil tank through a pipeline. The fuel delivery pump can realize the efficient utilization of fuel of an engine fuel system, can effectively reduce the oil return amount of the whole vehicle while ensuring the exhaust smoothness and the reliability of the system, avoids the delivery of all return oil by accessories of the whole vehicle, and reduces the energy consumption; meanwhile, the oil inlet vacuum degree at the front end of the oil transfer pump can be effectively reduced, and the reliability and the durability of the oil transfer pump are improved.

Description

Integrated oil transfer pump of heavy diesel engine

Technical Field

The utility model relates to an integrated form fuel delivery pump of heavy diesel engine belongs to diesel engine fuel delivery system technical field.

Background

The fuel delivery pump is an important component of a fuel system of a diesel engine, and has the function of ensuring that sufficient diesel oil is delivered from a fuel tank to a fuel injection pump and maintaining a certain fuel supply pressure to overcome the resistance of a pipeline and a fuel filter so as to circulate the diesel oil in a low-pressure pipeline. At present, the mainstream design of a fuel system of a domestic heavy diesel engine is that excessive diesel oil is conveyed to a fuel injection pump through a fuel delivery pump, the injection requirement of a fuel injector is met, meanwhile, fuel oil is directly returned to a fuel tank through a fuel return pipeline, and the fuel system does not have the function of oil return redistribution. The prior scheme has the following problems: 1. the repeated delivery of diesel oil leads to the increase of the power consumption of accessories of the whole machine; 2. because the oil mass of the front end of the oil delivery pump is large, the on-way resistance loss is increased, the vacuum degree of the inlet of the oil delivery pump is directly increased, and the risk of cavitation inside the oil delivery pump is increased.

Disclosure of Invention

The utility model aims at the above defects of the prior art, and provides a novel integrated oil transfer pump of a heavy diesel engine, the oil return structure in the oil transfer pump can realize the high-efficiency utilization of fuel oil of an engine fuel system, the oil return quantity of the whole engine can be effectively reduced while the system exhaust smoothness and the system reliability are ensured, the transmission of all oil returns by complete machine accessories is avoided, and the energy consumption is reduced; meanwhile, the oil inlet vacuum degree at the front end of the oil transfer pump can be effectively reduced, and the reliability and the durability of the oil transfer pump are improved.

In order to achieve the above object, the technical solution of the present invention is:

an integrated oil transfer pump of a heavy diesel engine comprises a driving gear flange, a pump body, a pump cover and an oil liquid driving structure arranged in the pump body, wherein an oil inlet and an oil outlet are formed in one side of the pump body, an outer port of the oil inlet is sequentially communicated with a rough filter and an oil tank through a pipeline, and an outer port of the oil outlet is communicated with an oil injection pump through a pipeline; the other side of the pump body is provided with an engine main oil return pipe, the outer end of the engine main oil return pipe is communicated with the fine filter and the fuel injection pump in sequence through a pipeline, the inner end of the engine main oil return pipe is communicated with a cavity where the oil liquid driving structure in the pump body is located through an overflow valve, a whole vehicle oil return branch pipe is arranged on the pipe wall outside the overflow valve in the engine main oil return pipe, a throttling hole is formed in the inner end of the whole vehicle oil return branch pipe, and the whole vehicle can be communicated with the outer end of the.

Preferably, the engine main oil return pipe and the whole engine, the branch pipe and the pump body are integrally cast.

Preferably, a reinforcing rib is arranged between the whole vehicle and the outer wall of the branch pipe and the outer wall of the engine main oil return pipe.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the novel oil transfer pump is provided with an oil return structure with an oil return redistribution function (the oil return structure is an engine main oil return pipe with an overflow valve and a whole vehicle oil return branch pipe with a throttling hole, which is arranged on the wall of the engine main oil return pipe), so that the whole vehicle oil return amount can be effectively reduced while the system exhaust smoothness and the system reliability are ensured, the whole vehicle accessories are prevented from conveying all return oil, and the energy consumption is reduced.

2. This novel oil transfer pump's oil return structure can effectively reduce the oil feed vacuum of oil transfer pump front end through the redistribution to the oil return, improves oil transfer pump's reliability and durability.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a rear view of the present invention;

fig. 3 is a right side view of the present invention;

fig. 4 is a sectional view taken along line a-a in fig. 3.

In the figure: the engine oil return device comprises a driving gear flange 1, an oil outlet 2, an oil inlet 3, an engine main oil return pipe 4, a whole vehicle oil return branch pipe 5, a pump cover 6, a pump body 7, an overflow valve 8 and a throttling hole 9.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Referring to fig. 1 to 4, an integrated oil transfer pump of a heavy diesel engine comprises a driving gear flange 1, a pump body 7, a pump cover 6 and an oil liquid driving structure arranged in the pump body 7, wherein an oil inlet 3 and an oil outlet 3 are arranged on one side of the pump body 7, an outer port of the oil inlet 3 is sequentially communicated with a coarse filter and an oil tank through a pipeline, and an outer port of the oil outlet 3 is communicated with an oil injection pump through a pipeline; the other side of the pump body 7 is provided with an engine main oil return pipe 4, the outer end of the engine main oil return pipe 4 is communicated with a fine filter and an oil injection pump in sequence through a pipeline, the inner end of the engine main oil return pipe 4 is communicated with a cavity where an oil driving structure in the pump body 7 is located through an overflow valve 8 (the oil driving structure is an oil driving gear arranged in the pump body), a whole vehicle oil return branch pipe 5 is arranged on the pipe wall outside the overflow valve 8 in the engine main oil return pipe 4, the inner end of the whole vehicle oil return branch pipe 5 is provided with a throttling hole 9, and the whole vehicle can be communicated with the outer end of.

As a preferred technical scheme, the engine main oil return pipe 4 and the whole engine, the branch pipe 5 and the pump body 7 are integrally cast.

As the preferred technical scheme, a reinforcing rib is arranged between the whole vehicle and the outer wall of the branch pipe 5 and the outer wall of the engine main oil return pipe 4.

The principle of the utility model is as follows: the return oil is subjected to matched flow division in a cavity of a main oil return pipe 4 of the engine through an overflow valve 8 and a throttling hole 9, about 80% of the return oil directly enters a cavity where an oil liquid driving structure in a pump body 7 is located after passing through the overflow valve 8, is mixed with the oil inlet at the pre-filtering end, and is pressurized and conveyed to an oil injection pump through an oil conveying pump; the other return oil is returned directly to the tank via the throttle 9 and then participates in the fuel supply cycle of the fuel system. The overflow valve 8 and the throttling hole 9 are used in a matched mode, so that the oil return can be redistributed, and the advantages are as follows: 1. the oil return quantity of the whole vehicle can be effectively reduced while the system exhaust smoothness and the system reliability are ensured, the transmission of all return oil by accessories of the whole vehicle is avoided, and the energy consumption is reduced; 2. the oil inlet vacuum degree at the front end of the oil transfer pump can be effectively reduced, and the reliability and the durability of the oil transfer pump are improved.

The above description is made for further details of the present invention with reference to the specific embodiments, and it should not be considered that the embodiments of the present invention are limited to these descriptions, and for those skilled in the art to which the present invention pertains, the simple replacement made without departing from the concept of the present invention should be considered as belonging to the protection scope of the present invention.

Claims

1. An integrated oil transfer pump of a heavy diesel engine comprises a driving gear flange (1), a pump body (7), a pump cover (6) and an oil liquid driving structure arranged in the pump body (7), wherein an oil inlet (3) and an oil outlet (2) are formed in one side of the pump body (7), an outer port of the oil inlet (3) is sequentially communicated with a rough filter and an oil tank through a pipeline, and an outer port of the oil outlet (2) is communicated with an oil injection pump through a pipeline; the method is characterized in that: the opposite side of the pump body (7) is provided with the engine and always returns oil pipe (4), the outer end that the engine always returns oil pipe (4) is strained with the essence through the pipeline in order and is put through with the injection pump, the inner of engine always returns oil pipe (4) is through overflow valve (8) and the cavity switch-on at pump body (7) interior fluid drive structure place, in engine always returns oil pipe (4), be provided with whole car oil return branch pipe (5) on the pipe wall in overflow valve (8) outside, the inner of whole car oil return branch pipe (5) is provided with orifice (9), whole car can pass through pipeline and oil tank switch-on with the outer end of branch pipe (5).

2. The integrated fuel delivery pump of a heavy duty diesel engine as set forth in claim 1, wherein: the engine main oil return pipe (4) and the whole vehicle, the branch pipe (5) and the pump body (7) are integrally cast and formed.

3. The integrated fuel delivery pump of a heavy duty diesel engine as set forth in claim 1, wherein: and a reinforcing rib is arranged between the whole vehicle and the outer wall of the branch pipe (5) and the outer wall of the engine main oil return pipe (4).