CN217976574U - Split type gear oil transfer pump - Google Patents

Abstract

A split type gear oil transfer pump is composed of a cover plate, a cavity component, a cavity bottom component, a gear and a gear shaft, wherein the cover plate is connected with the cavity component through a screw and sealed through a first rubber sealing ring; the cavity body part and the cavity bottom part are assembled together through a pin and sealed through a second rubber sealing ring; the gear shaft is pressed on the cavity bottom part in an interference press-fitting mode; the gear is in clearance fit with the gear shaft. The utility model discloses can be applicable to multiple high-efficient processing technology, on concrete plane, precision such as cylindricity, plane degree, roughness all has higher promotion, therefore has stronger low-speed oil absorption ability.

Description

Split type gear oil transfer pump

Technical Field

The utility model relates to a diesel engine fuel oil system technical field, concretely relates to split type gear fuel delivery pump.

Background

In the face of increasingly severe energy and environmental pressures, high pressure common rail pumps are already standard for current diesel fuel systems. In the high-pressure common rail pump, a fuel delivery pump is a necessary device, and the fuel delivery pump is used for delivering fuel from a fuel tank to the high-pressure pump and ensuring that the delivery amount and the delivery pressure of the fuel meet the requirements of the high-pressure pump.

The oil transfer pump has various forms, the most common forms are gear type, cycloid rotor type and blade type, wherein the gear type is divided into inner gear type and outer gear type. The gear type oil transfer pump has the advantages of simple structure, uniform flow, reliable work and the like, and occupies more space in the use of the diesel engine.

The biggest difficulty in the gear type oil transfer pump is in the aspect of low-speed oil absorption capacity, and the low-speed oil absorption capacity is closely related to the precision of parts. To achieve a strong low-speed oil absorption capacity, the precision of the parts is required to be high, so that a small leakage amount is achieved. Particularly, the precision requirement of relevant parts forming the gear chamber is very high, and the strong low-speed oil absorption capacity can be realized. For example, the upper and bottom surfaces of the gear chamber, which are engaged with the upper and lower end surfaces of the gear, require high flatness, roughness, etc.; the wall surface of the gear chamber that engages with the addendum circle of the gear is also required to have high cylindricity, roughness, and the like. However, in the prior art, the internal space of the gear chamber is narrow, so that the process selection is limited more, and thus many efficient machining processes cannot be applied. The common turning process is difficult to meet the requirements of roughness and flatness, so that the processing efficiency is low, the reject ratio is high, and the cost is high.

To the problem that above-mentioned integral type gear fuel delivery pump exists, the utility model discloses a split type gear fuel delivery pump.

Disclosure of Invention

A split type gear oil transfer pump comprises a cover plate, a cavity part, a cavity bottom part, a gear shaft and a gear, wherein the cover plate, the cavity part and the cavity bottom part form a gear chamber for gear motion; the cover plate is connected with the cavity body component through a screw, and the cavity body component and the cavity bottom component are assembled together through a pin; the gear shaft is pressed on the cavity bottom piece in an interference press-fitting mode; the gear is in clearance fit with the gear shaft, and the gear rotates around the gear shaft; the gear rotation is driven by the power device through the connecting piece.

Further, the cover plate and the cavity component are sealed through a first rubber sealing ring; the cavity body component and the cavity bottom component are sealed through a second rubber sealing ring.

The utility model discloses applicable multiple high-efficient processing technology, on concrete planes such as wall, precision such as cylindricity, plane degree, roughness all have higher promotion, therefore have stronger low-speed oil absorption ability, consequently, compare in current integral type fuel delivery pump, the utility model discloses a machining precision is showing improvement, the processing degree of difficulty reduces, machining efficiency promotes, whole cost descends, has stronger economic nature.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-a cover plate; 2-a first rubber sealing ring; 3-a connector; 4-a gear; 5-a cavity member; 6-gear shaft; 7-a second rubber sealing ring; 8-pins; 9-a chamber bottom part; 10-gear chamber bottom surface; 11-gear chamber wall.

Detailed Description

Referring to fig. 1, a split type gear oil transfer pump is composed of a cover plate 1, a cavity component 5, a cavity bottom component 9, a gear 4 and a gear shaft 6. Wherein the cover plate 1, the cavity part 5 and the cavity bottom part 9 form a gear chamber for the movement of the gear 4. The cover plate 1 and the cavity component 5 are connected through screws and sealed through the first rubber sealing ring 2. The chamber bottom part 9 and the chamber body part 5 are assembled together by a pin 8 and sealed by a second rubber sealing ring 7. The gear shaft 6 is press-fitted on the cavity bottom part 9 in an interference press-fitting manner. The gear 4 is in clearance fit with a gear shaft 6, and the gear shaft 6 carries the motion of the gear 4. The connecting piece 3 is in clearance fit with the gear 4, and the driving device drives the gear 4 to rotate through the connecting piece 3.

The utility model discloses a structure, the realization of the technology of being convenient for, the required precision such as the flatness of two terminal surfaces of gear room bottom surface 10 and cavity part 5 and roughness can use terminal surface to grind technology or two terminal surfaces and grind the technology and reach, precision and efficiency and obtain the promotion that is showing. The gear chamber wall surface 11 of the cavity component 5 can adopt more reasonable process and cutter due to the expansion of the internal space, and the precision requirements of the planeness and the roughness of the gear chamber wall surface are met. The gear shaft 6 can adopt the technology such as centerless grinding to realize the precision requirements on the roughness and the cylindricity.

The utility model discloses have obvious advantage on spare part processing technology, finished product assembly process, can convenient efficient realize the processing of spare part and off-the-shelf equipment, the economic nature is considerable.

The utility model discloses in can be through the thickness that changes cavity part 5 and gear 4, just can change the output oil mass of finished product petroleum pump, realize the serialization of product very easily, match the engine of different discharge capacities demands.

The utility model provides a split type scheme can be suitable for on the fuel delivery pump of other types such as intermeshing gear formula fuel delivery pump and cycloid rotor formula fuel delivery pump equally, all can reduce the technology degree of difficulty and the cost of gear room casing.

Claims (2)

1. The utility model provides a split type gear oil transfer pump which characterized in that: the gear chamber for gear motion is formed by the cover plate, the cavity part and the cavity bottom part; the cover plate is connected with the cavity body component through a screw, and the cavity body component is assembled with the cavity bottom component through a pin; the gear shaft is pressed on the cavity bottom part in an interference press-fitting mode; the gear is in clearance fit with the gear shaft and rotates around the gear shaft; the gear rotation is driven by the power device through the connecting piece.

2. The split gear fuel delivery pump according to claim 1, wherein: the cover plate and the cavity component are sealed through a first rubber sealing ring; the cavity body part and the cavity bottom part are sealed through a second rubber sealing ring.

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