Split type high pressure oil supply pump oil supply assembly

Abstract

This invention relates to a split-type high-flow-rate, high-pressure oil supply pump assembly, belonging to the field of power machinery technology. The assembly includes a plunger, a plunger sleeve, and an upper body. The plunger is housed within the plunger sleeve, forming a plunger assembly. The upper body is located on the upper part of the plunger sleeve, with a positioning pin between the plunger sleeve and the upper body. An inlet valve spring seat is coaxially mounted at the connection point. An inlet valve core is coaxially mounted within the upper body, with an inlet valve spring between them. The upper body also contains an outlet valve spring seat, an outlet valve core, and an outlet valve spring. The axis of the outlet valve spring seat forms an acute angle with the axis of the plunger. The plunger reciprocates within the plunger sleeve to control the oil output. This invention employs a split-type structure, reducing the processing difficulty and cost of deep holes and tapered holes. It allows for multi-component expansion to quickly generate a series of products. It can also integrate a high-pressure chamber to replace the high-pressure common rail pipe, achieving a compact common rail system and improving system reliability.

Description

Technical Field

[0001] This invention belongs to the field of power machinery technology, specifically relating to a split-type high-flow-rate high-pressure oil supply pump oil supply assembly. Background Technology

[0002] With the continuous development of diesel engine technology, the power density of diesel engines is becoming increasingly higher, placing higher demands on the performance of the engine's "heart"—the fuel supply system. The high-pressure common rail fuel system, with its high pressure and flexible adjustable characteristics, is an effective means of achieving the desired power density for diesel engines. The high-pressure fuel pump is a crucial component of the high-pressure common rail system, and its performance directly determines a series of important parameters affecting the performance of the high-pressure common rail fuel system, including the pressure in the common rail and its pressure fluctuations.

[0003] As the core of the high-pressure fuel pump, the fuel supply assembly compresses low-pressure fuel to high pressure. The fit clearance between the plunger and the plunger sleeve is crucial. The plunger and plunger sleeve must ensure both flexibility and high-pressure sealing. Summary of the Invention

[0004] This invention provides a split-type high-flow-rate high-pressure oil supply pump assembly, which overcomes the shortcomings of existing technologies.

[0005] To solve the above technical problems, the present invention provides a split-type high-flow-rate high-pressure oil supply pump oil supply assembly, characterized in that it includes a plunger (1), a plunger sleeve (2), and an upper body (3). The plunger (1) is disposed inside the plunger sleeve (2) and the two are coaxial. The plunger (1) and the plunger sleeve (2) form a plunger assembly. The upper body (3) is positioned and assembled on the upper part of the plunger sleeve (2) by a positioning pin (4). An oil inlet valve spring seat (5) is provided at the connection between the plunger sleeve (2) and the upper body (3). The oil inlet valve spring seat (5) and the plunger (1) are connected by a spring seat (5). The upper body (3) is coaxial with the plunger (1); the upper body (3) is provided with an oil inlet valve core (6), the oil inlet valve core (6) is coaxial with the plunger (1), and an oil inlet valve spring (7) is provided between the oil inlet valve spring seat (5) and the oil inlet valve core (6); the upper body (3) is also provided with an oil outlet valve spring seat (8), an oil outlet valve core (9) and an oil outlet valve spring (10), the oil outlet valve spring (10) is provided between the oil outlet valve spring seat (8) and the oil outlet valve core (9), and the plunger (1) reciprocates in the plunger sleeve (2) to control the oil output.

[0006] Furthermore, the axis of the oil outlet valve spring seat (8) is set at an acute angle to the axis of the plunger (1).

[0007] Furthermore, the inlet valve spring (7) provides elastic restoring force to the inlet valve core (6), and the outlet valve spring (10) provides elastic restoring force to the outlet valve core (9).

[0008] Furthermore, the fitting clearance between the plunger (1) and the plunger sleeve (2) satisfies both the requirements of high-pressure sealing and flexible movement.

[0009] Furthermore, the oil supply assembly is a split structure, which decomposes the deep and long hole and the conical surface structure into simple geometric features on the independent sub-components of plunger (1), plunger sleeve (2) and upper body (3).

[0010] Furthermore, the oil supply assembly integrates a high-pressure chamber, which is a built-in structure used to replace the high-pressure common rail to achieve high-pressure accumulation.

[0011] Furthermore, the fuel supply assembly can be expanded to include multiple components. By mounting different numbers of the fuel supply assemblies on the high-pressure fuel supply pump, a series of high-pressure fuel supply pump products adapted to different engine power requirements can be derived.

[0012] Furthermore, the fuel supply assembly is also provided with an oil inlet channel, which is connected to the high-pressure chamber to provide a delivery channel for low-pressure fuel.

[0013] Furthermore, the high-pressure chamber is connected to the inlet and outlet channels of the fuel supply assembly to realize the storage and transportation of high-pressure fuel.

[0014] Furthermore, multiple oil supply components share a single high-pressure chamber.

[0015] Beneficial Effects: The split-type oil supply assembly of this invention has good manufacturability, and the machining difficulty of deep holes and tapered holes is low. Traditional integrated oil supply assemblies require the direct machining of a series of deep and long holes or high-precision mating holes on the entire assembly, which places extremely high demands on the precision of the machining tools. The split-type oil supply assembly, through modular decomposition, breaks down the deep and long holes and tapered surfaces that were originally integrated into a single complex component into relatively simple aggregate features on multiple independent sub-components. This design significantly reduces the structural complexity of individual parts, thereby reducing machining costs.

[0016] The split-type fuel supply assembly allows for the expansion of multiple components. By flexibly equipping different numbers of fuel supply components, a series of products that meet the power requirements of different engines can be quickly developed, which can significantly shorten the development cycle of high-pressure fuel pumps.

[0017] It can integrate a high-pressure chamber to replace the high-pressure common rail. Through a clever flow channel design, the high-pressure accumulator chamber is directly built into the high-pressure fuel pump, which can realize the compactness of the high-pressure common rail system, simplify the pipeline connection in the engine, thereby reducing the risk of fuel leakage due to loose joints and improving the reliability of the system. Attached Figure Description

[0018] Figure 1 A structural diagram of the oil supply assembly for a split-type high-pressure oil supply pump; Figure 2This is a schematic diagram of a multi-component expansion of a split-type oil supply system; Figure 3 Schematic diagram of the integrated high-pressure chamber of the split-type oil supply assembly; In the figure, 1-plunger, 2-plunger sleeve, 3-upper body, 4-positioning pin, 5-inlet valve spring seat, 6-inlet valve core, 7-inlet valve spring, 8-outlet valve spring seat, 9-outlet valve core, 10-outlet valve spring. Detailed Implementation

[0019] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0020] The present invention proposes a split-type high-flow-rate high-pressure oil supply pump oil supply assembly, including a plunger 1, a plunger sleeve 2, and an upper body 3. The plunger is coaxially assembled in the plunger sleeve 2 to form a plunger pair, ensuring the flexibility of the two parts and high-pressure sealing. The upper body 3 is located on the upper part of the plunger sleeve, and the positioning pin is located between the plunger sleeve and the upper body to realize a reliable connection of the split-type components. At the connection between the plunger sleeve 2 and the upper body 3, an inlet valve spring seat 5 is coaxially arranged. The inlet valve core is located inside the upper body and is coaxial with the plunger. The inlet valve spring is located between the inlet valve spring seat and the inlet valve core. The outlet valve spring seat is located inside the upper body, and its axis forms an acute angle with the plunger axis. The outlet valve core is located inside the upper body. The outlet valve spring is located between the outlet valve spring seat and the outlet valve core. The outlet valve spring 10 provides a restoring force for the outlet valve core 9. The oil output is controlled by the reciprocating motion of the plunger within the plunger sleeve.

[0021] During processing, the deep holes and conical surfaces of the original integrated oil supply assembly are machined into independent sub-components such as plunger 1, plunger sleeve 2, and upper body 3. The machining features of each component are simple and do not require ultra-high precision machining tools. After machining, the complete oil supply assembly is formed by assembly, which greatly reduces the machining difficulty and cost.

[0022] In practical applications, for low-power engines, a single fuel supply component can be installed on the high-pressure fuel supply pump; for medium and high-power engines, two or more fuel supply components can be flexibly installed to achieve multi-component expansion and quickly form a series of high-pressure fuel supply pump products that can adapt to different power requirements, without the need to redesign the overall fuel supply structure and shorten the research and development cycle.

[0023] Meanwhile, the high-pressure chamber and fuel inlet are integrated into the fuel supply assembly. The fuel inlet provides a delivery channel for low-pressure fuel. After the fuel is compressed into high pressure by the plunger assembly, it is stored in the high-pressure chamber. The high-pressure chamber directly replaces the traditional external high-pressure common rail pipe, eliminating unnecessary pipe joints, simplifying the internal pipeline layout of the engine, reducing the risk of fuel leakage, and improving the operational reliability of the high-pressure common rail system.

[0024] The fuel supply assembly of the present invention is compatible with the high-pressure common rail fuel system of various diesel engines, and is especially suitable for the high-pressure fuel supply pump of high-power density diesel engines. It can effectively improve the performance and compatibility of the high-pressure fuel supply pump, thereby improving the overall efficiency of the diesel engine fuel supply system.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A split-type high-flow-rate, high-pressure oil supply pump assembly, characterized in that, The assembly includes a plunger (1), a plunger sleeve (2), and an upper body (3). The plunger (1) is located inside the plunger sleeve (2) and the two are coaxial. The plunger (1) and the plunger sleeve (2) form a plunger assembly. The upper body (3) is positioned and assembled on the upper part of the plunger sleeve (2) by a positioning pin (4). An inlet valve spring seat (5) is provided at the connection between the plunger sleeve (2) and the upper body (3). The inlet valve spring seat (5) is coaxial with the plunger (1). An inlet valve core (6) is provided inside the upper body (3). The oil inlet valve core (6) is coaxial with the plunger (1), and an oil inlet valve spring (7) is provided between the oil inlet valve spring seat (5) and the oil inlet valve core (6); the upper body (3) is also provided with an oil outlet valve spring seat (8), an oil outlet valve core (9) and an oil outlet valve spring (10), and the oil outlet valve spring (10) is provided between the oil outlet valve spring seat (8) and the oil outlet valve core (9). The plunger (1) reciprocates in the plunger sleeve (2) to control the oil output.

2. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 1, characterized in that, The axis of the oil outlet valve spring seat (8) is set at an acute angle to the axis of the plunger (1).

3. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 1, characterized in that, The inlet valve spring (7) provides elastic restoring force to the inlet valve core (6), and the outlet valve spring (10) provides elastic restoring force to the outlet valve core (9).

4. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 1, characterized in that, The fitting clearance between the plunger (1) and the plunger sleeve (2) satisfies both the requirements of high-pressure sealing and flexible movement.

5. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 1, characterized in that, The oil supply assembly is a split structure, which decomposes the deep long hole and conical surface structure into simple geometric features on independent sub-components such as plunger (1), plunger sleeve (2), and upper body (3).

6. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to any one of claims 1-5, characterized in that, The oil supply assembly integrates a high-pressure chamber, which is a built-in structure used to replace the high-pressure common rail to achieve high-pressure accumulation.

7. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 6, characterized in that, This fuel supply assembly can be expanded to include multiple components. By mounting different numbers of these fuel supply assemblies on the high-pressure fuel supply pump, a series of high-pressure fuel supply pump products adapted to different engine power requirements can be derived.

8. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 6, characterized in that, The fuel supply assembly is also provided with an oil inlet channel, which is connected to the high-pressure chamber to provide a delivery channel for low-pressure fuel.

9. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 6, characterized in that, The high-pressure chamber is connected to the inlet and outlet channels of the fuel supply assembly to realize the storage and transportation of high-pressure fuel.

10. The split-type high-flow-rate high-pressure oil supply pump oil supply assembly according to claim 7, characterized in that, Multiple oil supply components share a single high-pressure chamber.

Images