Clamping jaw structure of air compressor driving fuel pump

Abstract

The utility model relates to a clamping jaw structure for driving a fuel pump by an air compressor. The clamping jaw structure comprises the air compressor and the fuel pump, a pump shaft of the fuel pump is connected to a crankshaft of the air compressor; the pump shaft is driven to rotate through the crankshaft. A two-jaw chuck and a cross block are arranged at the end part of the pump shaft; a key matched with the cross block is arranged on the end face of the crankshaft. According to the utility model, the overall structure of the engine assembly is more compact, and the occupied space is reduced; the reliability and the performance stability of the engine assembly structure are improved, and the failure rate is reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and specifically to a chuck structure for an air compressor-driven fuel pump. Background Technology

[0002] Car engines are generally equipped with an air compressor and a fuel pump. The function of the air compressor is to generate compressed air to provide power for the car's pneumatic system; the function of the fuel pump is to deliver fuel from the fuel tank to the fuel line of the fuel injector, and then provide fuel to the engine's combustion chamber.

[0003] In the prior art, the air compressor and fuel pump are generally driven by the engine through gears or sprockets. That is, gears (or sprockets) that drive the crankshaft of the air compressor and gears (or sprockets) that drive the pump shaft of the fuel pump are respectively set on the crankshaft of the engine. The crankshaft of the air compressor and the pump shaft of the fuel pump are driven to rotate through the engine's gear (or sprocket) system. However, this driving method makes the arrangement of the air compressor and fuel pump occupy a lot of space, and the structure of the engine assembly is not compact.

[0004] The shortcomings of existing technology are:

[0005] 1. Due to the large space occupied by the air compressor and fuel pump in the existing technology, the structure of the engine assembly is not compact.

[0006] 2. Due to the fact that the existing air compressor driving fuel pump transmission structure mostly adopts a welding and bolt connection method, this connection method requires extremely high wear resistance and machining accuracy of the sub-parts. At the same time, as the vehicle's running time increases and the vehicle vibrates, the stress concentration in the bolt holes and weak points of the welding in this transmission structure is aggravated, resulting in extremely high failure rates such as bolt stripping or weld breakage. Summary of the Invention

[0007] This utility model addresses the above-mentioned problems by providing a claw structure for an air compressor-driven fuel pump. Its purpose is to make the overall structure of the engine assembly more compact, reduce the space occupied, improve the reliability and performance stability of the engine assembly structure, and reduce the failure rate.

[0008] To solve the above problems, the technical solution provided by this utility model is as follows:

[0009] The collet structure for driving a fuel pump with an air compressor includes an air compressor and a fuel pump, wherein:

[0010] The pump shaft of the fuel pump is connected to the crankshaft of the air compressor; the crankshaft drives the pump shaft to rotate.

[0011] Preferably, the pump shaft end is provided with a two-jaw chuck and a cross block; the crankshaft end face is provided with a key that cooperates with the cross block.

[0012] Preferably, the cross block is a block structure with a cross shape and four keyways; the front end of the two-jaw chuck is provided with two jaws; the shape of the keyway matches the shape of the key and the jaws; the key and the jaws are detachably inserted into the keyway to realize the connection between the pump shaft and the crankshaft.

[0013] Preferably, the key and the claw are respectively fitted with the keyway with a small clearance, so that the key and the claw are respectively firmly inserted into the keyway.

[0014] Preferably, the keyway, the key, and the claw have a dovetail joint structure.

[0015] Preferably, the bottom of the keyway is provided with an arc-shaped clearance structure.

[0016] Preferably, after the cross block is fitted onto the jaw, the two-jaw chuck is fixed and locked by a hexagonal nut; the cross block can slide along the length direction of the jaw.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] 1. Since the air compressor and fuel pump of this utility model are fixed on the engine as a whole, the arrangement of the air compressor and fuel pump in the prior art is more compact, thereby making the overall structure of the engine assembly more compact and reducing the space occupied.

[0019] 2. Due to the highly integrated structure of this utility model, the number of engine parts is reduced.

[0020] 3. Since the components of the claw mating structure of this utility model are all integrally forged, the reliability and performance stability of the engine assembly structure are improved, and the failure rate is reduced.

[0021] 4. Because the jaw engagement structure of this utility model has a complete streamline, it avoids the performance weaknesses caused by welding or bolt connection.

[0022] 5. Due to the good uniformity of the claw engagement structure of this utility model, the seamless overall structure, and the more uniform stress distribution, it has obvious advantages in the high-load and high-vibration vehicle operating environment.

[0023] 6. Due to the higher strength and toughness of the jaw fit structure of this utility model, and the refinement of grains during the forging process, fatigue resistance and impact resistance are improved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the arrangement of the air compressor and fuel pump on the engine according to a specific embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the connection between the crankshaft of the air compressor and the pump shaft of the fuel pump in a specific embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the pump shaft end of a fuel pump according to a specific embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the key structure provided at the crankshaft end of an air compressor, which is a specific embodiment of this utility model.

[0028] Among them: 1. Air compressor, 2. Fuel pump, 3. Engine, 11. Crankshaft, 21. Pump shaft, 211. Two-jaw chuck, 212. Cross block, 111. Key, 212A. Keyway, 211A. Jaw, 213. Hex nut Detailed Implementation

[0029] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0030] like Figure 1 As shown, a chuck structure for an air compressor driving a fuel pump includes an air compressor 1 and a fuel pump 2, wherein:

[0031] The pump shaft 21 of the fuel pump 2 is connected to the crankshaft 11 of the air compressor 1; the air compressor 1 and the fuel pump 2 are connected to form a whole and then fixed on the engine 3, and the pump shaft 21 is driven to rotate by the crankshaft 11.

[0032] It should be noted that this utility model differs from the prior art in that the fuel pump 2 is driven by the timing gear or sprocket system of the engine 3. Compared with the prior art, the arrangement of the air compressor 1 and the fuel pump 2 in the engine assembly provided by this utility model makes the structure of the engine assembly more compact, occupies less space, and is beneficial to the overall vehicle layout.

[0033] It should be noted that, as Figure 1 , 2 As shown in Figures 3 and 4, the pump shaft 21 is provided with a two-jaw chuck 211 and a cross block 212 at its end; the crankshaft 11 is provided with a key 111 that cooperates with the cross block 212 on its end face.

[0034] It should be noted that the cross block 212 is a block structure with a cross shape and four keyways 212A; the front end of the two-jaw chuck 211 is provided with two jaws 211A; the shape of the keyway 212A matches the shape of the key 111 and the jaws 211A; the key 111 and the jaws 211A are detachably inserted into the keyway 212A to realize the connection between the pump shaft 21 and the crankshaft 11.

[0035] It should be noted that, in order for the fuel pump 2 to respond quickly under the drive of the air compressor 1, the machining precision requirements for the key 111, the jaws 211A, and the cross-shaped keyway 212A are relatively high. The key 111 and the jaws 211A are respectively fitted with the keyway 212A with a small clearance, thereby ensuring that the key 111 and the jaws 211A are securely inserted into the keyway 212A. When the air compressor 1 starts, the pump shaft 21 of the fuel pump 2 can start quickly with the crankshaft 11, and the impact load on the fuel pump 2 during operation is small.

[0036] It should be noted that, due to the small clearance between key 111 and jaws 211A and keyway 212A, and the potential coaxiality error that may occur during manufacturing, assembly may be difficult or impossible. To address this issue, in this embodiment, as follows... Figure 3 As shown, the keyway 212A, key 111, and claw 211A have a dovetail joint structure. The bottom of the keyway 212A has a rounded clearance structure.

[0037] It should be further explained that after the cross block 212 is fitted onto the jaw 211A, the two-jaw chuck 211 is fixed and locked by the hexagonal nut 213; the cross block 212 can be positioned along the length of the jaw 211A (e.g., ...). Figure 3 (In the direction of the middle arrow) Slide. This design can achieve connection through physical interlocking, disperse stress through concave-convex interlocking, compensate for processing errors during manufacturing, and also has the advantage of preventing detachment.

[0038] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0039] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0040] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0041] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A chuck structure for an air compressor-driven fuel pump, characterized in that: It includes an air compressor (1) and a fuel pump (2), wherein: The pump shaft (21) of the fuel pump (2) is connected to the crankshaft (11) of the air compressor (1); the pump shaft (21) is driven to rotate by the crankshaft (11).

2. The chuck structure for an air compressor-driven fuel pump according to claim 1, characterized in that: The pump shaft (21) is provided with a two-jaw chuck (211) and a cross block (212) at its end; the crankshaft (11) is provided with a key (111) that cooperates with the cross block (212) on its end face.

3. The chuck structure for an air compressor-driven fuel pump according to claim 2, characterized in that: The cross block (212) is a block structure with a cross shape and four keyways (212A); the front end of the two-jaw chuck (211) is provided with two jaws (211A); the shape of the keyway (212A) matches the shape of the key (111) and the jaws (211A); the key (111) and the jaws (211A) are detachably inserted into the keyway (212A) to realize the connection between the pump shaft (21) and the crankshaft (11).

4. The chuck structure for an air compressor-driven fuel pump according to claim 3, characterized in that: The key (111) and the claw (211A) are respectively fitted with the keyway (212A) with a small gap, so that the key (111) and the claw (211A) are respectively firmly inserted into the keyway (212A).

5. The chuck structure for an air compressor-driven fuel pump according to claim 4, characterized in that: The keyway (212A) and the key (111) and the claw (211A) have a dovetail joint structure.

6. The chuck structure for an air compressor-driven fuel pump according to claim 5, characterized in that: The bottom of the keyway (212A) is provided with an arc-shaped clearance structure.

7. The chuck structure for an air compressor-driven fuel pump according to claim 6, characterized in that: After the cross block (212) is fitted onto the jaw (211A), the two-jaw chuck (211) is fixed and locked by a hexagonal nut (213); the cross block (212) can slide along the length direction of the jaw (211A).

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