Crank gear assembly suitable for transmission system of liquid adding pump

Abstract

The utility model relates to the technical field of drainage equipment, in particular to a crank gear assembly suitable for a transmission system of a liquid adding pump, which comprises a crank gear used for outputting power; the crank gear comprises a gear disc, a supporting part which is arranged at one shaft side end of the gear disc and is used for supporting the gear disc from the bottom, and a connecting part which is arranged at the other shaft side end of the gear disc and is used for limiting and supporting the gear disc along the radial surface; the connecting part comprises a lower connecting part and an upper guide part, the lower connecting part is arranged in a lower shell of the liquid adding pump and used for being connected with the supporting part to support the gear disc, and the upper guide part is arranged in an upper shell of the liquid adding pump and used for being connected with the joining part; and the connecting part is in sliding fit with the upper guide part.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage equipment, in particular to a crank gear assembly suitable for a transmission system of a liquid adding pump. Background Art

[0002] Liquid pumps are widely used in household appliances such as, but not limited to, dishwashers and washing machines. Liquid pumps generally include a cavity, a motor, a transmission system, etc. The cavity is used to pump and output liquid, the motor is used to generate power, and the transmission system is used to transmit the power generated by the motor to the cavity.

[0003] The transmission system is usually implemented by a gear assembly. Regarding the final transmission gear in the gear assembly, that is, the transmission gear at the end of the power transmission, for example, the announcement number is CN

[0004] The liquid filling pump proposed in the patent 209733895U is composed of a crank slider mechanism consisting of a final-stage transmission gear, a pull rod and a bellows, so the final-stage transmission gear is defined as a crank gear.

[0005] The crank gear in the above-mentioned public technology is connected to the housing of the liquid filling pump by a single cantilever shaft, that is, during the operation of the crank gear, the single cantilever shaft realizes the rotation support of the crank gear. The following problems are found in the actual use of this structure:

[0006] Firstly, since the crank gear is subject to a large load, and the single cantilever shaft has poor strength and no supporting structure at the protruding end, the single cantilever shaft is prone to overload fracture or fatigue fracture.

[0007] Furthermore, the single cantilever shaft has poor anti-bending performance. The periodic change of load during the rotation of the crank gear will cause the cantilever shaft to bend periodically, which will cause the crank gear to run unsteadily, reduce the flow accuracy, and in severe cases cause the crank gear to come off the shaft and fail to work normally.

[0008] Therefore, for the crank gear used in the above technology, its relevant structure needs to be newly optimized in terms of its stability during long-term use. Utility Model Content

[0009] The utility model aims to provide a crank gear assembly suitable for a transmission system of a liquid filling pump, so as to solve the technical problem of improving the stability of the crank gear during long-term use.

[0010] The crank gear assembly of the transmission system of the liquid filling pump of the utility model is realized as follows:

[0011] A crank gear assembly suitable for a transmission system of a liquid charging pump, comprising:

[0012] A crank gear, which is used to output power; the crank gear includes a gear plate, a support portion provided at one axial side end of the gear plate for supporting the gear plate from the bottom, and a connecting portion provided at the other axial side end of the gear plate for limiting and supporting the gear plate along a radial surface;

[0013] The connecting part comprises a lower connecting part arranged in the lower shell of the liquid adding pump and used to be connected with the supporting part to form support for the gear plate, and an upper guiding part arranged in the upper shell of the liquid adding pump and used to be connected with the connecting part; the connecting part and the upper guiding part are in sliding fit.

[0014] In an optional embodiment of the present invention, the support portion and the gear plate are coaxially distributed, and the connecting portion is eccentrically arranged relative to the axis of the gear plate; and

[0015] The upper guide portion is formed with a circular guide rail adapted to the engagement portion;

[0016] The axis of the annular guide rail coincides with the axis of the gear plate.

[0017] In an optional embodiment of the present utility model, the crank gear further includes a matching portion provided between the limiting portion and the gear plate for matching with a pull rod of a liquid filling pump; and

[0018] The matching portion is a cylindrical structure.

[0019] In an optional embodiment of the utility model, the upper guide portion includes concentrically distributed inner guide pillars and an outer guide ring located on the outer layer of the inner guide pillars;

[0020] The annular guide rail is formed between the outer guide ring and the inner guide column.

[0021] In an optional embodiment of the utility model, the connecting portion is a cylindrical structure integrally formed with the matching portion; the cylindrical structure is suitable for being inserted into the annular guide rail;

[0022] As the gear plate rotates, the cylindrical structure is suitable for moving along the annular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the cylindrical structure.

[0023] In an optional embodiment of the present invention, the connecting portion is an arc-shaped structure integrally formed on the connecting portion; the outer wall surface of the arc-shaped structure is coplanar with the outer wall surface of the connecting portion; and

[0024] The arc-shaped structure is suitable for being inserted into the circular guide rail; as the gear plate rotates, the arc-shaped structure is suitable for moving along the circular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the arc-shaped structure.

[0025] In an optional embodiment of the present invention, the connecting portion is an arc-shaped sheet integrally formed on the connecting portion; the inner arc wall surface and the outer arc wall surface of the arc-shaped sheet are not coplanar with the outer side wall of the connecting portion; and

[0026] The arc-shaped sheet is suitable for being inserted into the circular guide rail; as the gear plate rotates, the arc-shaped sheet is suitable for moving along the circular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the arc-shaped sheet.

[0027] In an optional embodiment of the utility model, the connecting portion includes a cylindrical connecting head integrally formed on the connecting portion, and an arc-shaped notch provided on the cylindrical connecting head; and the corresponding upper guide portion is an arc-shaped limiting ring for forming an annular guide rail;

[0028] The limiting ring is suitable for plugging and fitting with the arc-shaped groove; as the gear plate rotates, the arc-shaped groove is suitable for moving along the limiting ring, and the outer wall surface and the inner wall surface of the limiting ring are suitable for sliding fitting with the arc-shaped groove.

[0029] In an optional embodiment of the present invention, a projection of the connecting portion in the axial direction is located on the end surface of the fitting portion facing the connecting portion.

[0030] In an optional embodiment of the present invention, there are at least two radial matching surfaces between the connecting portion and the annular guide rail, which are suitable for forming resistance forces in opposite directions on the crank gear.

[0031] In an optional embodiment of the present invention, at least two contact points are formed on at least one of the radial mating surfaces along the circumferential direction of the connecting portion.

[0032] By adopting the above technical scheme, the utility model has the following beneficial effects: the utility model is suitable for the crank gear assembly of the transmission system of the liquid filling pump. For the crank gear, firstly, the supporting part and the connecting part respectively located at the two axial sides of the gear plate cooperate with the connecting part of the liquid filling pump to strengthen the supporting effect of the crank gear during operation, thereby avoiding the problem in the prior art that relying on a separate cantilever shaft to support the crank gear may cause deformation or even breakage of the cantilever shaft.

[0033] Secondly, for the upper guide part in the connecting part, on the basis of realizing the radial support effect for the crank gear, it can also limit the position of the crank gear during operation, so as to avoid the crank gear from running off, thereby improving the operation accuracy of the crank gear during the use of the liquid filling pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the crank gear assembly of the transmission system of the liquid adding pump of the utility model applied in the liquid adding pump;

[0035] Figure 2 1 is a schematic structural diagram of a crank gear of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a first implementation situation;

[0036] Figure 3 1 is a schematic structural diagram of an upper guide portion of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a first implementation situation;

[0037] Figure 4 It is a schematic diagram of the matching structure of the upper guide part and the crank gear of the crank gear assembly of the transmission system of the liquid filling pump in the first implementation case of the embodiment 1 of the utility model;

[0038] Figure 5 1 is a schematic structural diagram of a crank gear from a first perspective of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a second implementation situation;

[0039] Figure 6 1 is a second perspective structural schematic diagram of a crank gear of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a second implementation situation;

[0040] Figure 7 It is a structural schematic diagram of an upper guide portion of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the utility model in a second implementation situation;

[0041] Figure 8 It is a schematic diagram of the matching structure of the upper guide part and the crank gear of the crank gear assembly of the transmission system of the liquid filling pump in the second implementation situation of the embodiment 1 of the utility model;

[0042] Fig. 9 It is a schematic structural diagram of a crank gear of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a third implementation situation;

[0043] Fig.10 1 is a schematic structural diagram of an upper guide portion of a crank gear assembly of a transmission system of a liquid filling pump according to Embodiment 1 of the present utility model in a third implementation situation;

[0044] Fig.11 It is a schematic diagram of the matching structure of the upper guide part and the crank gear of the crank gear assembly of the transmission system of the liquid filling pump in the third implementation situation of the embodiment 1 of the utility model;

[0045] Fig.12 It is a structural schematic diagram of a crank gear of a crank gear assembly of a transmission system of a liquid adding pump according to Embodiment 2 of the present utility model;

[0046] Fig.13 It is a structural schematic diagram of an upper guide portion of a crank gear assembly of a transmission system suitable for a liquid filling pump according to Embodiment 2 of the present utility model;

[0047] Fig.14 It is a schematic diagram of the matching structure of the upper guide part and the crank gear of the crank gear assembly of the transmission system suitable for the liquid filling pump in Example 2 of the utility model.

[0048] In the figure: upper shell 11, lower shell 12, lower connecting part 13, gear plate 21, supporting part 22, matching part 23, cylindrical structure 24, arc structure 25, arc sheet 26, arc groove 27, inner guide column 31, outer guide ring 32, annular guide rail 33, limit ring 34, pull rod 4. DETAILED DESCRIPTION

[0049] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0050] Embodiment 1:

[0051] See also Figures 1 to 11 As shown, this embodiment provides a crank gear assembly suitable for a transmission system of a liquid adding pump, including: a crank gear and a connecting portion for use. The connecting portion itself is designed in the upper shell 11 and the lower shell 12 of the liquid adding pump, and the upper shell 11 and the lower shell 12 cooperate to form an integral use cavity of the liquid adding pump, and the crank gear can be assembled in the use cavity to form a match between the connecting portion and the crank gear. Regarding the liquid adding pump here, in addition to the crank gear assembly, it also includes, for example, a pull rod 4 connected to the crank gear in the liquid adding pump disclosed in the patent with announcement number CN 209733895 U, a bellows connected to the pull rod 4, and a driving structure for driving the crank gear to operate. This embodiment does not make any improvements to this part of the structure, so its specific structure is not limited.

[0052] Next, specifically, first, the crank gear used in the liquid filling pump for outputting power in this embodiment includes a gear plate 21, a support portion 22 provided at one axial side end of the gear plate 21 for supporting the gear plate 21 from the bottom, and a connecting portion provided at the other axial side end of the gear plate 21 for limiting and supporting the gear plate 21 along a radial surface.

[0053] It should be noted that, in order to meet the use requirements of the pull rod 4 in the liquid filling pump, the crank gear of this embodiment also includes a matching portion 23 arranged between the limit portion and the gear plate 21 for matching the pull rod 4 of the liquid filling pump; and the general matching portion 23 is a cylindrical structure 24.

[0054] Secondly, the connecting part includes a lower connecting part 13 provided in the lower shell 12 of the liquid filling pump and connected to the supporting part 22 to form a support for the gear plate 21, and an upper guiding part provided in the upper shell 11 of the liquid filling pump and connected to the connecting part; the connecting part and the upper guiding part are in sliding cooperation. Under this structure, when the crank gear is assembled with the upper shell 11 and the lower shell 12, the lower connecting part 13 is matched with the supporting part 22, and the connecting part is matched with the upper guiding part. In this way, for the overall crank gear, there are two shaft side end supports between the upper shell 11 and the lower shell 12, so that the supporting pressure brought by each shaft side end to the corresponding lower connecting part 13 and the upper guiding part can be reduced, thereby reducing the risk of deformation or even breakage of the lower connecting part 13 and the upper guiding part.

[0055] Based on the above structure, it needs to be explained that, in this embodiment, the support portion 22 and the gear plate 21 are coaxially distributed, and the connecting portion is eccentrically arranged relative to the axis of the gear plate 21; and a circular guide rail 33 adapted to the connecting portion is formed in the upper guide portion; the axis of the circular guide rail 33 coincides with the axis of the gear plate 21.

[0056] Next, the specific upper guide part and the connection part are described in detail with reference to the accompanying drawings:

[0057] Generally speaking, in terms of the structural shape itself, the upper guide portion includes concentrically distributed inner guide columns 31 and outer guide rings 32 located on the outer layer of the inner guide columns 31 ; a circular guide rail 33 is formed between the outer guide ring 32 and the inner guide columns 31 .

[0058] Based on the upper guide portion, in the first optional implementation, the connecting portion is a cylindrical structure 24 integrally formed with the matching portion 23; the cylindrical structure 24 is suitable for being inserted into the annular guide rail 33. In this regard, as the gear plate 21 rotates, the cylindrical structure 24 is suitable for moving along the annular guide rail 33, and the outer wall surface of the inner guide column 31 and the inner wall surface of the outer guide ring 32 are both suitable for sliding cooperation with the cylindrical structure 24.

[0059] In this regard, it should be noted that the connecting portion and the matching portion 23 here can be selected as cylindrical structures 24 with the same diameter, so that in the process of processing and production, it is equivalent to lengthening the axial length of the matching portion 23 in the prior art, and the production difficulty is low. Of course, the diameter of the connecting portion here can also be smaller than the diameter of the matching portion 23, and the connecting portion and the matching portion 23 at this time can be a coaxial distribution structure or a non-coaxial distribution structure. This embodiment does not make an absolute limitation on this. Based on this situation, in a preferred embodiment, the projection of the connecting portion in the axial direction is located on the end face of the matching portion 23 facing the connecting portion, that is, the outer boundary of the projection of the connecting portion in the axial direction will not exceed the outer boundary of the projection of the matching portion 23 in the axial direction.

[0060] Of course, in theory, the diameter of the connecting portion here can also be larger than the diameter of the matching portion 23. For the specific size and specific position of the connecting portion relative to the matching portion 23, it is only necessary to design an adaptive upper guide portion to meet the use requirements.

[0061] In the second optional implementation, the connecting portion is an arc-shaped structure 25 integrally formed on the connecting portion; preferably, the outer wall surface of the arc-shaped structure 25 is coplanar with the outer wall of the connecting portion. In addition, during the operation of the crank gear, the circular trajectories generated by the arc-shaped structure 25 and the matching portion 23 overlap or are distributed in concentric circles.

[0062] The proportion of the arc-shaped structure 25 to the radial surface of the overall matching portion 23 is not absolutely limited in this embodiment, and can be selected as one-half, that is, the arc-shaped structure 25 is a semi-cylindrical structure 24 relative to the matching portion 23. Based on this structure, the arc-shaped structure 25 is suitable for being inserted into the circular guide rail 33; as the gear plate 21 rotates, the arc-shaped structure 25 is suitable for moving along the circular guide rail 33, and the outer wall surface of the inner guide column 31 and the inner wall surface of the outer guide ring 32 are both suitable for sliding cooperation with the arc-shaped structure 25.

[0063] Of course, in theory, the outer wall of the arc-shaped structure 25 and the outer wall of the connecting portion may not be coplanar. For the specific size and position of the connecting portion relative to the matching portion 23, only an adaptive upper guide portion needs to be designed to meet the usage requirements.

[0064] In the third implementation, the connecting portion is an arc-shaped sheet 26 integrally formed on the connecting portion; the inner arc wall surface and the outer arc wall surface of the arc-shaped sheet 26 are not coplanar with the outer side wall of the connecting portion; in a preferred manner, the center of the arc-shaped sheet 26 passes through the axis of the matching portion 23. And during the operation of the crank gear, the circular trajectories generated by the arc-shaped sheet 26 and the matching portion 23 respectively overlap or are in a concentric circle distribution structure.

[0065] Under this structure, the arc-shaped sheet 26 is suitable for being inserted into the circular guide rail 33; as the gear plate 21 rotates, the arc-shaped sheet 26 is suitable for moving along the circular guide rail 33, and the outer wall surface of the inner guide column 31 and the inner wall surface of the outer guide ring 32 are suitable for sliding cooperation with the arc-shaped sheet 26.

[0066] For the above three different implementations, it should be noted that although the upper guide structure of the connecting part adapted to the three different implementations is roughly concentrically distributed inner guide column 31 and outer guide ring 32; however, the sizes of the inner guide column and outer guide ring 32 in each implementation are not the same, so that the size of the circular guide rail 33 formed is different to adapt to different connecting parts.

[0067] In addition, it is necessary to explain that there are at least two radial mating surfaces between the connecting portion and the annular guide rail 33, and the directions of the radial resistance forces formed by at least two radial mating surfaces on the crank gear are opposite; and at least two contact points are formed on at least one of the radial mating surfaces along the circumferential direction of the connecting portion. Based on this structure, the position of the crank gear during operation can be limited by the cooperation between the upper guide portion and the connecting portion, thereby avoiding the crank gear from running off, thereby improving the operating accuracy of the crank gear during the use of the liquid filling pump.

[0068] Finally, it is necessary to explain that, for the structure of the support portion 22 and the lower connecting portion 13 of this embodiment, mature means in the prior art may be optionally adopted, and this embodiment is not limited to this. Even if the structure of the liquid filling pump disclosed in the patent with announcement number CN 209733895 U is adopted, since this embodiment adds the cooperation of the upper guide portion and the connecting portion to reduce the supporting pressure of the crank gear on the lower connecting portion 13, the risk of deformation or even breakage of the lower connecting portion 13 can also be reduced.

[0069] Embodiment 2:

[0070] See also Figure 12 to Figure 14 As shown, based on the crank gear assembly of the transmission system of the liquid filling pump in Example 1, the crank gear assembly of the transmission system of the liquid filling pump provided in this embodiment adopts a connecting portion including a cylindrical connector integrally formed on the connecting portion, and an arc-shaped notch 27 provided on the cylindrical connector; and a corresponding upper guide portion is a limiting ring 34 in the shape of an arc for forming an annular guide rail 33. The cylindrical connector is preferably the same diameter as the matching portion 23, so it can also be understood that the axial length of the matching portion 23 of the prior art is lengthened, and the arc-shaped notch 27 is directly provided on the extended version of the matching portion 23.

[0071] Based on this structure, the limit ring 34 is suitable for plugging and fitting with the arc-shaped groove 27; as the gear plate 21 rotates, the arc-shaped groove 27 is suitable for moving along the limit ring 34, and the outer wall surface and the inner wall surface of the limit ring 34 are suitable for sliding fit with the arc-shaped groove 27.

[0072] Based on the above situation, it is necessary to explain that, in theory, the specific position of the arc-shaped groove 27 on the cylindrical connector is not absolutely limited in this embodiment. As long as the circular trajectories generated by the arc-shaped groove 27 and the mating part 23 respectively coincide with each other or are distributed in concentric circles during the operation of the crank gear, the use requirements are met. In the preferred implementation, the center of the arc-shaped groove 27 passes through the axis of the mating part 23.

[0073] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0074] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A crank gear assembly suitable for a transmission system of a liquid filling pump, characterized in that: include: A crank gear, which is used to output power; the crank gear includes a gear plate, a support portion provided at one axial side end of the gear plate for supporting the gear plate from the bottom, and a connecting portion provided at the other axial side end of the gear plate for limiting and supporting the gear plate along a radial surface; The connecting part comprises a lower connecting part arranged in the lower shell of the liquid adding pump and used to be connected with the supporting part to form support for the gear plate, and an upper guiding part arranged in the upper shell of the liquid adding pump and used to be connected with the connecting part; the connecting part and the upper guiding part are in sliding fit.

2. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 1, characterized in that: The support portion and the gear plate are coaxially distributed, and the connecting portion is eccentrically arranged relative to the axis of the gear plate; and The upper guide portion is formed with a circular guide rail adapted to the engagement portion; The axis of the annular guide rail coincides with the axis of the gear plate.

3. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 2, characterized in that: The crank gear further includes a matching portion disposed between the limiting portion and the gear plate for matching with a pull rod of a liquid filling pump; and The matching portion is a cylindrical structure.

4. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 3, characterized in that: The upper guide portion includes inner guide pillars which are concentrically distributed and outer guide rings which are located on the outer layer of the inner guide pillars; The annular guide rail is formed between the outer guide ring and the inner guide column.

5. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 4, characterized in that: The connecting portion is a cylindrical structure integrally formed with the matching portion; the cylindrical structure is suitable for being inserted into the annular guide rail; As the gear plate rotates, the cylindrical structure is suitable for moving along the annular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the cylindrical structure.

6. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 4, characterized in that: The connecting portion is an arc-shaped structure integrally formed on the connecting portion; the outer wall surface of the arc-shaped structure is coplanar with the outer wall surface of the connecting portion; and The arc-shaped structure is suitable for being inserted into the circular guide rail; as the gear plate rotates, the arc-shaped structure is suitable for moving along the circular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the arc-shaped structure.

7. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 4, characterized in that: The connecting portion is an arc-shaped sheet integrally formed on the connecting portion; the inner arc wall surface and the outer arc wall surface of the arc-shaped sheet are not coplanar with the outer side wall of the connecting portion; and The arc-shaped sheet is suitable for being inserted into the circular guide rail; as the gear plate rotates, the arc-shaped sheet is suitable for moving along the circular guide rail, and the outer wall surface of the inner guide column and the inner wall surface of the outer guide ring are suitable for sliding cooperation with the arc-shaped sheet.

8. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 3, characterized in that: The connecting portion includes a cylindrical connecting head integrally formed on the connecting portion, and an arc-shaped notch provided on the cylindrical connecting head; and the corresponding upper guide portion is an arc-shaped limiting ring for forming an annular guide rail; The limiting ring is suitable for plugging and fitting with the arc-shaped groove; as the gear plate rotates, the arc-shaped groove is suitable for moving along the limiting ring, and the outer wall surface and the inner wall surface of the limiting ring are suitable for sliding fitting with the arc-shaped groove.

9. The crank gear assembly suitable for the transmission system of the liquid filling pump according to any one of claims 5 to 8, characterized in that: The projection of the connecting portion in the axial direction is located on the end surface of the matching portion facing the connecting portion.

10. The crank gear assembly suitable for the transmission system of a liquid filling pump according to any one of claims 6 to 8, characterized in that: There are at least two radial matching surfaces between the connecting portion and the annular guide rail, which are suitable for forming resistance forces in opposite directions on the crank gear.

11. The crank gear assembly suitable for the transmission system of the liquid filling pump according to claim 10, characterized in that: At least two contact points are formed on at least one of the radial matching surfaces along the circumferential direction of the engaging portion.

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