Gear structure and air compressor

Abstract

The invention discloses a gear structure and an air compressor. The gear structure comprises an outer gear ring made of a metal material and a base material part made of a non-metal material, and the gear structure is formed through secondary injection molding. According to the gear structure, the transmission precision can be improved and the service life can be prolonged while the manufacturing and mounting processes are simplified.

Description

Technical Field

[0001] The present application relates to the field of automobile maintenance, and in particular to a gear structure and an air compressor with such a gear structure. Background Art

[0002] During the driving process of the car, sometimes the tire will have abnormal conditions, such as tire deflation, damage, etc. In this case, it is often necessary to provide fast tire repair and inflation for the tire, and an air compressor is needed during this process.

[0003] In air compressors, there are gear structures for transmission, such as converting the rotational motion of the motor into reciprocating motion. There is an air compressor whose gears are integrally molded from a single material, and then the gear shaft, eccentric counterweight, crankshaft pin, etc. are installed on this basis. The disadvantages of such an air compressor are that there are many parts, the installation structure and process are complex, and the manufacturing cost is high. In addition, gears of a single material cannot take into account various physical properties and economic efficiency.

[0004] Therefore, it is necessary to conduct a thorough study on existing problems or drawbacks, including those mentioned above, in order to improve them. Summary of the invention

[0005] The present application proposes a gear structure, which can simplify the manufacturing and installation processes while improving transmission accuracy and service life.

[0006] A gear structure proposed according to one aspect of the present application includes an outer gear ring made of a metal material and a base material part made of a non-metallic material, and the gear structure is formed by secondary injection molding.

[0007] According to the gear structure proposed in one aspect of the present application, a shape-matching structure is constructed between the outer gear ring and the substrate portion to limit the movement of the outer gear ring and the substrate portion relative to each other.

[0008] According to a gear structure provided in one aspect of the present application, the shape-fitting structure includes a protruding portion configured on the outer gear ring and a recessed portion configured on the base material portion.

[0009] According to a gear structure proposed in one aspect of the present application, the shape-fitting structure includes a recessed portion configured on the outer gear ring and a protruding portion configured on the base material portion.

[0010] According to the gear structure proposed in one aspect of the present application, an eccentric hole eccentric to the rotation center is provided in the base material portion for mounting a crank pin.

[0011] According to the gear structure proposed in one aspect of the present application, a protruding columnar structure is provided in the base material portion, and the eccentric hole is arranged in the columnar structure.

[0012] According to the gear structure proposed in one aspect of the present application, a counterweight is provided on the inner surface of the outer gear ring.

[0013] According to the gear structure proposed in one aspect of the present application, a ray starting from the center of the eccentric hole and pointing to the rotation center of the base material portion passes through the symmetry center of the counterweight block.

[0014] In addition, the present application proposes an air compressor with such a gear structure. Since the air compressor has the gear structure according to the present application, it can have the advantages as described above.

[0015] According to an air compressor proposed in one aspect of the present application, the air compressor also includes a motor, a motor output gear, a connecting rod, a piston and a compression cylinder.

[0016] The beneficial effects of the present application include: forming a gear structure by secondary injection molding an outer gear ring made of metal material and a substrate part made of non-metal material, thereby simplifying the manufacturing and installation process while improving transmission accuracy and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present application is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present application. In the drawings, unless otherwise specified, the same reference numerals are used to refer to the same components. Among them: Figure 1 The gear structure proposed according to one embodiment of the present application is schematically shown; Figure 2 Schematically shows Figure 1 The substrate portion; Figure 3 Schematically shows Figure 1 The outer gear ring in the Figure 4 An air compressor according to one embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0018] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the present application.

[0019] According to one embodiment of the present application, the gear structure is combined Figure 1 , Figure 2 and Figure 3As shown. The gear structure 100 includes an outer gear ring 1 made of a metal material and a substrate part 2 made of a non-metallic material, and the gear structure is formed by secondary injection molding. The metal material can be steel, iron-based powder, copper-based powder, etc.; the non-metallic material can be a polymer material, a composite material, plastic, ceramic, etc. Gears are provided on the outer circumference of the outer gear ring for meshing with other adjacent gears to transmit power. A rotating shaft is provided in the center of the substrate part, and the substrate part can rotate around the rotating shaft.

[0020] An exemplary manufacturing process of the gear structure is: metal is made into an outer gear ring part through powder metallurgy. Specifically, metal powder is first placed in mold A for compaction and shaping, and then sintered at high temperature and heat treated for hardening to obtain the "outer gear ring" part; the outer gear ring part is placed in a plastic mold B, and plastic resin is injected through injection molding. After pressure maintenance and cooling and shaping, the "base material part" of the part is obtained, and finally the molding of the gear structure is completed.

[0021] In the past, the defects of using a single material gear structure are: single material plastic gears often cause tooth root fracture (tooth shaving) due to overload, overheating and other factors, which accelerates wear and causes loss of machine function; plastic gears have poor surface accuracy and produce high noise during meshing transmission, affecting the user experience of the product. Although the strength and reliability of all-metal gears are improved, they add extra material weight, and are difficult to form through molds due to complex shapes, which also increases machining costs.

[0022] In the gear structure according to the present application, the outer gear ring of metal material and the substrate part of non-metallic material are formed into a gear structure by secondary injection molding. Firstly, the manufacturing is simple, and secondly, it can overcome the defects caused by the gear structure of a single material, while simplifying the manufacturing and installation process, improving the transmission accuracy and service life, which is conducive to high-power operation.

[0023] A shape-matching structure is configured between the outer gear ring and the substrate portion to limit the relative movement of the outer gear ring and the substrate portion. For example, the shape-matching structure is used to limit the relative movement of the outer gear ring and the substrate portion in the axial direction, and / or the shape-matching structure is used to limit the relative movement of the outer gear ring and the substrate portion in the rotation direction around the axial direction.

[0024] The form-fitting structure comprises, for example, a projection formed on the outer toothed ring and a depression formed on the base material part.

[0025] On the one hand, in the embodiment shown in the figure, a protrusion 19 extending in the circumferential direction is constructed in the axial middle of the inner surface of the outer gear ring 1, and a recess 29 extending in the circumferential direction is constructed in the axial middle of the outer surface of the substrate part 2. Taking the plane passing through the axis as the cross section, the substrate part looks like an I-shaped. At this time, the protrusion of the outer gear ring is located between the two axial ends of the substrate part, and the axial movement of the outer gear ring relative to the substrate part is restricted.

[0026] On the other hand, in the embodiment shown in the figure, a block 18 is constructed on the inner surface of the outer gear ring 1, and a slot 28 is constructed on the outer surface of the substrate part 2. The block can be embedded in the slot, so that the movement of the outer gear ring relative to the substrate part in the rotation direction around the axial direction is restricted. In other words, the outer gear ring cannot rotate relative to the substrate part, which is used to prevent the gear from slipping when it is subjected to torque. The matching pair of the block and the slot can be one or more; in the case where there are multiple blocks and slots in a matching state, they can be arranged uniformly or non-uniformly around the circumferential direction.

[0027] In addition, the form-fitting structure may further include a recessed portion configured on the outer gear ring and a protruding portion configured on the base material portion.

[0028] An eccentric hole eccentric to the rotation center is provided in the base material part for mounting a crank pin. The crank pin is used to drive the connecting rod to make a circular motion, and the input end of the connecting rod can swing around the crank pin. In the embodiment shown in the figure, a protruding columnar structure 22 is provided in the base material part 2, and an eccentric hole 21 is provided in the columnar structure. In this case, the protruding cylinder is formed by molding, which simplifies the manufacturing and installation process and reduces the cost.

[0029] A counterweight 11 is provided on the inner surface of the outer gear ring 1. The counterweight is, for example, integrally formed with the outer gear ring. The counterweight may extend over a portion of the axial direction of the outer gear ring, for example, the counterweight is disposed at one end or the middle of the axial direction of the outer gear ring. The counterweight may also extend over the entire axial direction of the outer gear ring.

[0030] The ray from the center of the eccentric hole to the rotation center of the substrate portion passes through the symmetry center of the counterweight. In other words, the counterweight is arranged at a position relative to the rotation center of the eccentric hole or the protruding columnar structure with respect to the gear structure, and is used to offset the inertial force of the connecting rod and the piston swinging around the eccentric hole. The distance between the center of the eccentric hole and the rotation center of the substrate portion is the eccentric distance e, by which the stroke L of the reciprocating motion of the piston is adjusted, L=2*e. The weight of the counterweight is configured to balance the weight of the connecting rod piston and the inertial centrifugal force generated by the eccentric distance e.

[0031] The present application also includes an air compressor having a gear structure of any one or more of the aforementioned embodiments. The technical features and technical effects thereof correspond to the previous description, so they will not be repeated here.

[0032] According to an embodiment of the present application, an air compressor is combined Figure 4 The air compressor further comprises a motor 3, a motor output gear 31, a connecting rod 4, a piston and a compression cylinder 5. The motor 3 outputs torque through the motor output gear 31, the motor output gear 31 drives the outer gear ring and the base material part to rotate, the base material part drives the crankshaft pin and the input end of the connecting rod 4 to make a circular motion, the piston is fixed at the output end of the connecting rod 4, and the output end of the connecting rod 4 drives the piston to reciprocate in the compression cylinder 5.

[0033] The technical scope of the present application is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present application, and these deformations and modifications should all fall within the protection scope of the present application.

Claims

1. A gear structure for an air compressor, characterized in that: The gear structure (100) comprises an outer gear ring (1) made of a metal material and a base material portion (2) made of a non-metallic material, and the gear structure is formed by secondary injection molding.

2. The gear structure according to claim 1, characterized in that: A shape-matching structure is configured between the outer gear ring and the substrate portion for limiting the relative movement of the outer gear ring and the substrate portion.

3. The gear structure according to claim 2, characterized in that: The form-fitting structure includes a protrusion configured on the outer gear ring and a recessed portion configured on the base material portion.

4. The gear structure according to claim 2, characterized in that: The form-fitting structure includes a recessed portion configured on the outer gear ring and a protruding portion configured on the base material portion.

5. The gear structure according to claim 1, characterized in that: An eccentric hole (21) eccentric to the rotation center is provided in the base material portion (2) for mounting a crankshaft pin.

6. The gear structure according to claim 5, characterized in that: A protruding columnar structure (22) is provided in the base material portion (2), and the eccentric hole is arranged in the columnar structure.

7. The gear structure according to claim 5, characterized in that: A counterweight (11) is provided on the inner surface of the outer gear ring (1).

8. The gear structure according to claim 7, characterized in that: A ray starting from the center of the eccentric hole (21) and pointing to the rotation center of the base material portion (2) passes through the symmetry center of the counterweight (11).

9. An air compressor, characterized in that: It comprises a gear structure according to any one of claims 1 to 8.

10. The air compressor according to claim 9, characterized in that: The air compressor also includes a motor, a motor output gear, a connecting rod, a piston and a compression cylinder.

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