Gear oil delivery pump

Abstract

The utility model discloses a gear oil delivery pump which comprises a pump body, and a positioning connector is arranged at one end of the pump body. An inner oil cavity is formed at the joint of the positioning interface and the high-pressure oil pump; a gear chamber is arranged at the other end of the pump body; a group of driving gear and driven gear which are meshed with each other are mounted in the gear chamber; a pump cover is mounted on the outer side of the gear chamber through a fastener, a transmission shaft is mounted in a center hole in the pump body on the positioning interface side, and a cross coupling is mounted at the other end of the transmission shaft and connected with a power shaft of the high-pressure oil pump; the pump body is provided with an oil inlet connected with an oil tank, the oil inlet extends to the gear chamber through an internal oil duct, one side of the gear chamber is provided with an oil inlet hole, and the other side of the gear chamber is internally provided with an oil outlet hole; or, an oil outlet is formed in the outer side of the pump body, and an oil outlet hole is formed in the gear chamber. Under the condition that an existing installation connector and an existing oil outlet connector are fixed, the requirement of a high-pressure pump for the gear type oil delivery pump can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fuel injection system oil pump technical field especially relates to a gear oil pump. BACKGROUND

[0002] In modern fuel injection systems, the high-pressure pump is a key component that is responsible for converting low-pressure diesel fuel into high-pressure fuel for injection. To ensure the proper functioning of the high-pressure pump, diesel fuel from the tank must first be drawn into the high-pressure pump by a low-pressure oil pump. Therefore, the oil pump, as a front-end functional module of the high-pressure pump, plays a crucial role in the entire fuel injection system.

[0003] Currently, based on existing product technology, there are multiple types of oil pumps, including vane-type oil pumps, external gear pumps, internal gear pumps, and gerotor pumps. Although these pumps have their advantages in their respective applications, they also have their limitations.

[0004] Traditional vane-type oil pumps have been widely used due to their simple structure and low manufacturing cost. However, the self-bleeding capability of vane pumps is relatively poor, especially at low speeds, which limits their application range and performance. With the changing market demands and the increasing performance requirements of customers, vane pumps have not been able to fully meet the needs of modern high-pressure pump systems.

[0005] At the same time, gear pumps exhibit higher superiority in performance and stability. However, in most cases where the high-pressure pump has already been finalized and the original installation method and oil path design have been fixed, it is difficult to replace the original vane pump with a gear pump in terms of structural design. This is mainly due to the differences in structure and size between gear pumps and vane pumps, and simple replacement may result in incompatibility or performance degradation.

[0006] Therefore, in order to solve the above problems and meet the market demand for high-performance and high-stability oil pumps, the utility model provides a new type of gear oil pump design scheme. This scheme aims to use a unified oil pump body blank, which can be flexibly matched with different types of high-pressure pumps through different structural designs. At the same time, through the switching design of the oil path, the selection of left and right rotation modes is realized, thereby greatly improving the applicability and flexibility of the oil pump. This innovative design aims to overcome the shortcomings of existing technology and provide a more efficient and stable fuel supply solution for high-pressure pump systems. SUMMARY

[0007] In view of the problems existing in the prior art, the utility model provides a gear oil pump.

[0008] The utility model discloses a gear oil pump which is characterized in that: a positioning interface is arranged at one end of the pump body, and an oil groove matched with the high-pressure oil pump is arranged in the positioning interface; the positioning interface is connected with the high-pressure oil pump, and an inner oil cavity is formed at the connection position of the positioning interface and the high-pressure oil pump; a gear chamber is arranged at the other end of the pump body, and a set of driving gears and driven gears are arranged in the gear chamber; a pump cover is arranged on the outer side of the gear chamber through fasteners; a driving shaft is arranged in the central hole of the pump body on the side of the positioning interface; the driving shaft is arranged with the driving gears on the gear chamber; a cross-coupling is arranged at the other end of the driving shaft and is connected with the power shaft of the high-pressure oil pump.

[0009] An oil inlet connected with an oil tank is arranged on the pump body, and the oil inlet extends to the gear chamber through an internal oil channel; an oil inlet hole is arranged on one side of the gear chamber, and an oil outlet hole is arranged on the other side of the gear chamber; or, an oil outlet is arranged on the outer side of the pump body, and an oil outlet hole is arranged in the gear chamber.

[0010] Preferably, an exhaust port communicated with the gear chamber is arranged in the pump body, and an exhaust valve is arranged on the exhaust port.

[0011] Preferably, an overload protection valve is arranged between the oil inlet and the oil outlet in the pump body.

[0012] The gear oil pump has the following advantages and technical effects:

[0013] Strong structure design and compatibility: the oil pump has a unique design and can be flexibly matched with high-pressure pumps of different models; through unified pump body blanks and different oil channel structure designs, high compatibility is achieved, and diversified market demands are met.

[0014] Oil channel switching and left-right rotation selection: the oil channel switching design enables the oil pump to meet the selection of left-right rotation modes, which greatly improves the applicability and flexibility of the oil pump and facilitates the adjustment of users according to actual needs.

[0015] High efficiency and stability: the external meshing gear pump structure makes the oil pump more efficient and stable during operation; the design of the meshing driving gears and driven gears ensures the smooth flow of oil, reduces pulsation and noise, and improves the reliability of the overall system.

[0016] Improved self-exhausting capacity: the arrangement of the exhaust port and the exhaust valve effectively improves the self-exhausting capacity of the oil pump, avoiding the influence of gas residues on the working efficiency and stability of the pump.

[0017] Overload protection function: the design of overload protection oil channel and overload protection valve provides additional safety for the oil pump. In the case of overload, the overload protection valve will automatically open to release pressure and prevent damage to the pump body.

[0018] Easy maintenance and repair: the pump cover is installed outside the gear chamber through fasteners, making it easier and faster to repair and maintain the pump. At the same time, the modular design of the components also reduces maintenance costs and time.

[0019] High cost performance: the utility model keeps high performance while considering manufacturing cost. Through unified pump body blank and modular design, it realizes large-scale production, reduces the cost of individual products, and improves market competitiveness.

[0020] In summary, the gear oil pump of the utility model has obvious advantages and technical effects in structure design, oil path switching, self-venting capacity, overload protection and cost performance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 and Figure 2 is a three-dimensional structure schematic diagram of the left-handed internal oil outlet gear oil pump of example 1;

[0022] Figure 3 is a three-dimensional exploded view of the left-handed internal oil outlet gear oil pump of example 1;

[0023] Figure 4 is an internal oil path diagram of the oil inlet of the left-handed internal oil outlet gear oil pump of example 1;

[0024] Figure 5 is a distribution diagram of the oil inlet and oil outlet hole positions of the left-handed internal oil outlet gear oil pump of example 1;

[0025] Figure 6 and Figure 7 is a three-dimensional structure schematic diagram of the right-handed internal oil outlet gear oil pump of example 2;

[0026] Figure 8 is a distribution diagram of the oil inlet and oil outlet hole positions of the right-handed internal oil outlet gear oil pump of example 2;

[0027] Figure 9 and Figure 10 is a three-dimensional structure schematic diagram of the left-handed external oil outlet gear oil pump of example 3;

[0028] Figure 11 is a three-dimensional exploded view of the left-handed external oil outlet gear oil pump of example 3;

[0029] Figure 12 is a distribution diagram of the oil inlet and oil outlet hole positions of the left-handed external oil outlet gear oil pump of example 3;

[0030] Figure 13 is a top view of the left-handed outward oil-out gear oil pump of example 3;

[0031] Figure 14 is Figure 13 is a middle A-A cross-sectional view;

[0032] Figure 15 is a structural schematic view of the right-handed outward oil-out gear oil pump of example 4;

[0033] Figure 16 is an exploded view of the right-handed outward oil-out gear oil pump of example 4;

[0034] Figure 17 is a distribution view of the oil inlet and oil outlet hole positions of the right-handed outward oil-out gear oil pump of example 4;

[0035] Figure 18 is a working principle view of the right-handed outward oil-out gear oil pump.

[0036] Fig., 1, pump body; 1-1, connecting lug; 1-2, positioning interface; 1-3, oil groove; 2-1, driving gear; 2-2, driven gear; 3, sealing ring; 4, pump cover; 5, fastener; 6, transmission shaft; 7, cross coupling; 8, exhaust valve; 9, overload protection valve; 11, oil inlet hole; 12, oil inlet; 13, hole; 14, oil inlet cavity; 15, oil outlet cavity; 16, oil outlet hole; 17, oil outlet. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0038] The utility model provides two kinds of specifications gear oil pump, and is divided into internal oil-out gear oil pump and outward oil-out gear oil pump according to the position of oil outlet.

[0039] According to the rotating direction, each kind of gear oil pump is divided into left-handed internal oil-out gear oil pump and right-handed internal oil-out gear oil pump, left-handed outward oil-out gear oil pump and right-handed outward oil-out gear oil pump. The following will be described in detail by combining with relevant drawings.

[0040] Example 1: a kind of gear oil pump, the gear oil pump is left-handed internal oil-out gear oil pump, please refer to Figures 1 to 5, including pump body 1, the outer wall of the pump body is provided with connecting lug 1-1 connected with high pressure oil pump, connecting lug is provided with four along the circumferential direction, through unified pump body blank and different oil way structure design, realizes the high compatibility, satisfies the diversified market demand. One end of the pump body is provided with positioning interface 1-2;Positioning interface is provided with oil groove 1-3 matched with high pressure oil pump in;Positioning interface is connected with high pressure oil pump, and the connecting place of positioning interface and high pressure oil pump forms inner oil chamber;The other end of the pump body is provided with gear chamber, a set of driving gear 2-1 and driven gear 2-2 are installed in the gear chamber;The outer side of the gear chamber is provided with pump cover 4 through fastener 5, and sealing ring 3 is arranged between the pump cover and the pump body, the transmission shaft 6 is installed in the central hole on the pump body on the side of the positioning interface, the driving gear is installed on the transmission shaft in the gear chamber, and the other end of the transmission shaft is provided with cross coupling 7 connected with the power shaft of the high pressure oil pump;

[0041] The pump body is provided with oil inlet 12 connected with oil tank, the oil inlet extends to the gear chamber through the internal oil channel, the gear chamber is provided with oil inlet hole 11 on one side, and the oil inlet 12 is communicated with the oil inlet hole 11, and the other side of the gear chamber is provided with oil outlet hole 16.

[0042] Example 2, for right-handed internal oil-out type gear oil pump, please refer to Figures 6 to 8 The right-handed internal oil-out type gear oil pump is the same as the left-handed internal oil-out type gear oil pump, except that the position of the oil inlet hole and the oil outlet hole is exchanged by radial machining of the oil channel of the pump body to meet the same rotational direction requirement.

[0043] Example 3: this embodiment is a left-handed external oil-out type gear oil pump, please refer to Figures 9 to 14 , and the difference between example 1 and example 2 is that the oil outlet 17 is arranged on the outer side of the pump body, and the oil outlet hole 16 communicated with the oil outlet 17 is arranged in the gear chamber. The oil inlet 12 and the oil outlet 17 are symmetrically arranged.

[0044] An overload protection valve 9 is arranged between the oil inlet 12 and the oil outlet 17 to prevent the pressure of the oil outlet from being overloaded, and the oil inlet and the oil outlet are provided with an exhaust valve 8 (a reverse one-way valve), which can be opened by positive pressure to be emptied.

[0045] Example 4: this embodiment is a right-handed external oil-out type gear oil pump, please refer to Figures 15 to 17 , and the difference between example 3 is that the oil inlet hole 11, the oil inlet 12 and the oil outlet hole 16 in the internal oil channel of the pump body and the oil outlet 17 are exchanged to change the rotational direction of the gear oil pump.

[0046] The right-handed external oil-out type gear oil pump is taken as an example to illustrate its working principle:

[0047] Please refer toFigure 18 The transmission shaft 6 is driven to rotate by the cross shaft 7, and the transmission shaft 6 rotates synchronously with the driving gear 2-1, and the driven gear 2-2 is driven to rotate reversely through gear engagement, and the adjacent two tooth profiles of the driving gear and the driven gear form closed chambers 21 and 22 with the inner cavity of the oil pump body 1 and the oil pump cover 4, and oil is continuously conveyed from one side (defined as the oil inlet chamber 14) to the other side (defined as the oil outlet chamber), so that oil supply is realized. The oil pump cover 4 and the oil pump body 1 are provided with a sealing ring 3 to prevent external leakage. The oil pump cover 4 is fixed on the oil pump body 1 by the fastening screw 5. If the rotation direction of the driving gear 2-1 is changed, the oil supply direction of the gear oil pump is also changed. The fuel enters the oil pump through the oil inlet 12, enters the oil inlet chamber 14 of the oil pump through the hole 13 and the oil inlet hole 11, is conveyed to the oil outlet chamber 15 through the driving gear and the driven gear, and reaches the oil outlet 17 through the oil outlet hole 16.

[0048] In summary, the gear oil pump of the utility model has obvious advantages and technical effects in aspects of structure design, oil path switching, self-exhausting capacity, overload protection and cost performance.

[0049] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gear oil pump characterized by: The pump body is provided with connecting ears around the outer wall for connecting with the high-pressure oil pump; one end of the pump body is provided with a positioning interface, and an oil groove is arranged in the positioning interface for connecting with the high-pressure oil pump; the positioning interface is connected with the high-pressure oil pump, and an inner oil cavity is formed at the connecting position of the positioning interface and the high-pressure oil pump; the other end of the pump body is provided with a gear chamber, and a set of driving gears and driven gears are installed in the gear chamber; a pump cover is installed on the outer side of the gear chamber through fasteners, a transmission shaft is installed in the central hole on the pump body at the positioning interface side, a driving gear is installed on the transmission shaft in the gear chamber, and a cross-coupling is installed on the other end of the transmission shaft for connecting with the power shaft of the high-pressure oil pump; An oil inlet is arranged on the pump body for connecting with the oil tank, the oil inlet extends to the gear chamber through an internal oil channel, an oil inlet hole is arranged on one side of the gear chamber, and an oil outlet hole is arranged on the other side of the gear chamber; or, an oil outlet is arranged on the outer side of the pump body, and an oil outlet hole is arranged in the gear chamber.

2. The gear oil pump of claim 1, wherein: An exhaust port is arranged in the pump body for communicating with the gear chamber, and an exhaust valve is installed on the exhaust port.

3. The gear oil pump of claim 1, wherein: An overload protection valve is installed between the oil inlet and the oil outlet in the pump body.

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