Gear box for variable frequency motor and working method of gear box

Abstract

The invention belongs to the technical field of engineering elements, and particularly relates to a gearbox for a variable frequency motor and a working method thereof. The invention provides a gear box for a variable frequency motor, which comprises an input shaft, an output shaft and a transmission shaft, the transmission fluted disc is arranged on the outer wall of the input shaft in a sleeving manner, and a limiting groove matched with the limiting pin is formed in the transmission fluted disc; the two clamping pieces are arranged on the two sides of the limiting groove correspondingly, and the distance between the two clamping pieces is smaller than the diameter of the limiting pin; if the limiting pin is not inserted into the limiting groove, the transmission fluted disc is suitable for axially moving relative to the input shaft; if the limiting pin is inserted into the limiting groove, the two clamping pieces are extruded by the limiting pin to deform, and the clamping pieces are suitable for limiting the limiting pin so as to prevent the transmission fluted disc from axially moving relative to the input shaft; through cooperation of the clamping piece and the limiting pin, whether the limiting pin is fixedly inserted into the transmission fluted disc or not can be conveniently detected, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering components, and specifically relates to a transmission device, and in particular to a gear box for a variable frequency motor and a working method thereof. Background Art

[0002] The main function of the gearbox is to change the transmission direction, adjust the speed and torque. It can transfer the power of the input shaft to the output shaft as required to achieve acceleration or deceleration, and can also make the rotation direction of the output shaft different from that of the input shaft to ensure efficient and stable operation of the power system. The gearbox includes at least two sets of transmission gear sets, one of which is fixed to the input shaft and the other is fixed to the output shaft, and the two sets of transmission gear sets are meshed with each other.

[0003] In the related art, during the assembly of the gearbox, the transmission gear disc is sleeved on the outer wall of the input shaft, a pin is provided on the outer wall of the input shaft, and a groove adapted to the pin is provided on the transmission gear disc to achieve fixation. However, since the transmission gear disc needs to be meshed with another set of transmission gear discs, and it is also necessary to ensure that the groove on the transmission gear disc and the pin are fully plugged in. Therefore, after the transmission gear disc and the other set of transmission gear discs are meshed with each other, it is necessary to detect whether the pin is inserted into the groove.

[0004] The traditional assembly method is to knock on the transmission gear disc to see whether it can continue to move downward. Since the distance between the transmission gear disc and the outer wall of the gear box is small, it is impossible to directly observe with the naked eye whether the pin is inserted into the groove.

[0005] Therefore, how to solve the technical problem of poor assembly stability of the traditional transmission gear plate and the input shaft is a technical problem that needs to be solved urgently in this field.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiments of the present disclosure at least provide a gear box for a variable frequency motor and a working method thereof.

[0008] In a first aspect, an embodiment of the present disclosure provides a gearbox for a variable frequency motor, comprising: An input shaft, on which a limit pin is rotatably arranged; A transmission gear plate is sleeved on the outer wall of the input shaft and is provided with a limit groove matched with the limit pin; Two clamping members, the two clamping members are respectively arranged on both sides of the limiting groove, and the distance between the two clamping members is smaller than the diameter of the limiting pin; Wherein, if the limit pin is not inserted into the limit groove, the transmission gear disc is suitable for axial movement relative to the input shaft; If the limit pin is inserted into the limit groove, the two clamping members are squeezed and deformed by the limit pin, and the clamping members are suitable for limiting the limit pin to prevent the transmission gear disc from axially moving relative to the input shaft.

[0009] In an optional embodiment, the limiting groove is semicircular, and the inner diameter of the limiting groove is larger than the diameter of the limiting pin; Among them, after the limiting pin abuts against the top wall in the limiting groove, when the input shaft drives the transmission gear plate to rotate, the limiting pin is suitable for rotating relative to the limiting groove.

[0010] In an optional embodiment, the clamping member is in an arc shape, with its lower end arranged on the inner wall of the limiting groove and its upper end passing through the limiting groove; The transmission gear sleeve moves downward along the input shaft until the limit pin abuts against the inner top wall of the limit groove; The two clamping members are suitable for clamping and limiting the limiting pin from two sides to prevent the limiting pin from being separated from the limiting groove.

[0011] In an optional embodiment, an oil storage groove is respectively provided on the inner walls on both sides of the limiting groove, and one oil storage groove corresponds to one clamping member; Wherein, when the clamping piece is squeezed and deformed by the limiting pin, it is suitable to be inserted into the oil storage tank, so that the grease in the oil storage tank flows to the outer wall of the limiting pin.

[0012] In an optional embodiment, the outer wall of the clamping member is provided with a plurality of long strip openings along the length direction, and an inclined angle is formed between the long strip openings and the axis of the limiting pin; When the limiting pin rotates relative to the clamping member, the elongated opening is suitable for scraping off excess grease on the outer wall of the limiting pin.

[0013] In an optional embodiment, the input shaft passes through the gear box housing, and a linkage gear plate is rotatably arranged in the housing, and the linkage gear plate is meshed with the transmission gear plate.

[0014] In an optional embodiment, the housing has a linkage gear disc rotatably disposed therein, and the linkage gear disc is sleeved on the outer wall of the output shaft; An input shaft passes through the housing and a limit pin is rotatably provided on the input shaft; A transmission gear plate is sleeved on the outer wall of the input shaft and is provided with a limit groove matched with the limit pin; Two clamping members, the two clamping members are respectively arranged on both sides of the limiting groove, and the distance between the two clamping members is smaller than the diameter of the limiting pin; The clamping member is in an arc shape, with its lower end arranged on the inner wall of the limiting groove and its upper end passing through the limiting groove; Wherein, if the limit pin is inserted into the limit groove, the two clamping members are squeezed and deformed by the limit pin, and the clamping members are suitable for limiting the limit pin to prevent the transmission gear disc from axially moving relative to the input shaft.

[0015] In an optional embodiment, the limiting groove is semicircular, and the inner diameter of the limiting groove is larger than the diameter of the limiting pin; Among them, after the limiting pin abuts against the top wall in the limiting groove, when the input shaft drives the transmission gear plate to rotate, the limiting pin is suitable for rotating relative to the limiting groove.

[0016] In an optional embodiment, an oil storage groove is respectively provided on the inner walls on both sides of the limiting groove, and one oil storage groove corresponds to one clamping member; Wherein, when the clamping piece is squeezed and deformed by the limiting pin, it is suitable to be inserted into the oil storage tank, so that the grease in the oil storage tank flows to the outer wall of the limiting pin.

[0017] In an optional embodiment, the outer wall of the clamping member is provided with a plurality of long strip openings along the length direction, and an inclined angle is formed between the long strip openings and the axis of the limiting pin; When the limiting pin rotates relative to the clamping member, the elongated opening is suitable for scraping off excess grease on the outer wall of the limiting pin.

[0018] In a second aspect, an embodiment of the present disclosure further provides a working method of a gearbox, the working method comprising: When assembling the gearbox, place the transmission gear disc on the outer wall of the input shaft so that the limit groove is aligned with the limit pin; If the limit pin is not inserted into the limit groove, the transmission gear plate is suitable for axial movement relative to the input shaft. At this time, when the transmission gear plate is pulled upward, it is suitable for upward movement relative to the input shaft. If the limit pin is inserted into the limit groove, the two clamping members are squeezed and deformed by the limit pin, and the clamping members are suitable for limiting the limit pin to prevent the transmission gear disc from axially moving relative to the input shaft.

[0019] The beneficial effect of the present invention is that a gearbox for a variable frequency motor and a working method thereof of the present invention, through the mutual cooperation between the clamping part and the limit pin, after the limit pin is inserted into the limit groove, the clamping part is suitable for limiting the limit pin to prevent it from escaping from the limit groove; by pulling the transmission gear disc, it is judged whether the limit pin is inserted into the limit groove according to whether it can move upward relative to the input shaft, thereby improving the detection efficiency after assembly.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A three-dimensional diagram of a gearbox for a variable frequency motor provided in an embodiment of the present disclosure; Figure 2 A three-dimensional diagram of a transmission gear disk and a clamping member provided in an embodiment of the present disclosure; Figure 3 A sectional front view of a limit groove and a clamping member provided in an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the state where the limit pin provided in the embodiment of the present disclosure is inserted into the limit groove.

[0024] In the figure: 1. Input shaft; 10. Limit pin; 2. Transmission gear disc; 20. Limit groove; 21. Oil storage tank; 3. Clamping piece; 30. Long strip mouth; 4. Housing; 5. Linkage gear disc. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component may be directly formed on the second component, or the third component may be interposed between the first component and the second component. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0027] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0029] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0030] After research, it is found that the disadvantages of the prior art are that in the related art, during the assembly process of the gearbox, the transmission gear disc is sleeved on the outer wall of the input shaft, a pin is set on the outer wall of the input shaft, and a groove adapted to the pin is provided on the transmission gear disc to achieve fixation. However, since the transmission gear disc needs to be meshed with another set of transmission gear discs, and it is also necessary to ensure that the groove on the transmission gear disc and the pin are fully plugged in. Therefore, after the transmission gear disc and the other set of transmission gear discs are meshed with each other, it is necessary to detect whether the pin is inserted into the groove.

[0031] Traditional detection methods are mostly to knock on the transmission gear disc to see whether it can continue to move downward; due to the small distance between the transmission gear disc and the outer wall of the gear box, it is impossible to directly observe with the naked eye whether the pin is inserted into the groove.

[0032] Therefore, how to solve the technical problem that the traditional transmission gear plate and the input shaft are difficult to fix and thus difficult to detect is a technical problem that urgently needs to be solved in this field.

[0033] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present invention in this article for the above problems should be the contributions made by the inventor to the present invention during the disclosure process.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] like Figures 1 to 4 As shown, some embodiments provide a gearbox for a variable frequency motor, comprising: an input shaft 1, on which a limit pin 10 is rotatably provided; one end of the input shaft 1 is inserted into the interior of the gearbox, and both ends of the limit pin 10 protrude from the outer wall of the input shaft 1; a transmission gear disc 2, which is sleeved on the outer wall of the input shaft 1 and is provided with a limit groove 20 adapted to the limit pin 10; two clamping members 3, the two clamping members 3 are respectively arranged on both sides of the limit groove 20, and the distance between the two clamping members 3 is smaller than the diameter of the limit pin 10; the clamping members 3 are elastic; wherein, if the limit pin 10 is not inserted into the limit groove 20, the transmission gear disc 2 is suitable for axial movement relative to the input shaft 1; when the limit pin 10 is not limited by the two clamping members 3, the transmission gear disc 2 is pulled upward, and the transmission gear disc 2 is suitable for upward movement relative to the input shaft 1. If the limit pin 10 is inserted into the limit groove 20, the two clamping members 3 are squeezed and deformed by the limit pin 10, and the clamping member 3 is suitable for limiting the limit pin 10 to prevent the transmission gear disc 2 from axially moving relative to the input shaft 1. After the limit pin 10 is limited by the clamping member 3, a positioning ring is sleeved on the outer wall of the input shaft 1 above the transmission gear disc 2 to further limit the transmission gear disc 2 to prevent the transmission gear disc 2 from colliding upwardly with the gear box end cover; through the mutual cooperation between the clamping member 3 and the limit pin 10, after the limit pin 10 is inserted into the limit groove 20, the clamping member 3 is suitable for limiting the limit pin 10 to prevent it from being separated from the limit groove 20; by pulling the transmission gear disc 2, it is judged whether the limit pin 10 is inserted into the limit groove 20 according to whether it can move upward relative to the input shaft 1, thereby improving the inspection efficiency after assembly.

[0037] Reference Figure 2The limiting groove 20 is semicircular, and the inner diameter of the limiting groove 20 is larger than the diameter of the limiting pin 10; wherein, after the limiting pin 10 abuts against the inner top wall of the limiting groove 20, when the input shaft 1 drives the transmission gear plate 2 to rotate, the limiting pin 10 is suitable for rotating relative to the limiting groove 20. After the limiting pin 10 is inserted into the limiting groove 20, the input shaft 1 is suitable for driving the transmission gear plate 2 to rotate.

[0038] Continue to refer to the attached Figure 2 The clamping member 3 is in an arc shape, with its lower end arranged on the inner wall of the limiting groove 20 and its upper end passing through the limiting groove 20; Figure 2 The transmission gear disc 2 is in a bottom wall upward state. When the transmission gear disc 2 is sleeved on the outer wall of the input shaft 1, the limit groove 20 is set downward so that the limit pin 10 can be inserted into the corresponding limit groove 20. The transmission gear disc 2 is sleeved and moved downward along the input shaft 1 until the limit pin 10 abuts against the inner top wall of the limit groove 20; the limit pin 10 is suitable for squeezing the clamping member 3 to deform; the two clamping members 3 are suitable for clamping and limiting the limit pin 10 from both sides to prevent the limit pin 10 from escaping from the limit groove 20. After assembly is completed, by pulling the transmission gear disc 2 upward, it is judged whether the limit pin 10 is inserted into the limit groove 20 according to whether it can move upward.

[0039] Reference Figure 3 and Figure 4 The inner walls of both sides of the limit groove 20 are respectively provided with an oil storage groove 21, and one oil storage groove 21 corresponds to one clamping member 3; each oil storage groove 21 stores grease, and the grease is suitable for reducing the friction between the limit pin 10 and the limit groove 20. Figure 4 When the limit pin 10 is inserted into the limit groove 20, the limit pin 10 exerts an extrusion force F on the clamping member 3, such as Figure 4 As shown in the figure, the clamping member 3 is suitable for being inserted into the oil storage groove 21 when it is squeezed and deformed by the limit pin 10, so that the grease in the oil storage groove 21 flows to the outer wall of the limit pin 10. When the input shaft 1 drives the transmission gear plate 2 to rotate, the limit pin 10 squeezes the clamping member 3, so that the grease in the oil storage groove 21 flows outward, further reducing the friction between the limit pin 10 and the limit groove 20. Continue to refer to the attached Figure 2, the outer wall of the clamping member 3 is provided with a plurality of long strip openings 30 along the length direction, and the long strip openings 30 and the axis of the limit pin 10 form an inclined angle; wherein, when the limit pin 10 rotates relative to the clamping member 3, the long strip openings 30 are suitable for scraping off the excess grease on the outer wall of the limit pin 10. When the limit pin 10 rotates relative to the input shaft 1, the excess grease on the outer wall of the limit pin 10 will be scraped off by the long strip openings 30 because the clamping frame is squeezed and deformed by the limit pin 10, and part of the scraped grease will flow into the chamber between the clamping member 3 and the limit groove 20; the excess grease on the outer wall of the limit pin 10 solidifies due to oxidation, which will affect the clamping and limiting effect of the clamping member 3 on the limit pin 10, and reduce the stability of the clamping member 3 fixing the limit pin 10. The excess grease is scraped off by the long strip openings 30, which can improve the stability of the fixation between the limit pin 10 and the clamping member 3.

[0040] Reference Figure 1 , the input shaft 1 passes through the gearbox housing 4, a linkage gear plate 5 is rotatably arranged in the housing 4, and the linkage gear plate 5 is meshed with the transmission gear plate 2. When assembling the gearbox, the transmission gear plate 2 must not only be meshed with the linkage gear plate 5, but also ensure that the limit pin 10 is inserted into the limit groove 20; therefore, the poor assembly stability of the traditional transmission gear plate 2 and the input shaft 1 makes it difficult to detect whether the limit pin 10 is inserted into the limit groove 20.

[0041] Continue to refer to the attached Figure 1 Some embodiments provide a gearbox for a variable frequency motor, comprising: a housing 4, in which a linkage gear disc 5 is rotatably arranged, and the linkage gear disc 5 is sleeved on the outer wall of the output shaft; an input shaft 1, which passes through the housing 4, and a limit pin 10 is rotatably arranged on the input shaft 1; a transmission gear disc 2, which is sleeved on the outer wall of the input shaft 1 and is provided with a limit groove 20 adapted to the limit pin 10; two clamping members 3, the two clamping members 3 are respectively arranged on both sides of the limit groove 20, and the distance between the two clamping members 3 is smaller than the diameter of the limit pin 10; the clamping member 3 is in an arc shape, the lower end of which is arranged on the inner wall of the limit groove 20, and the upper end passes through the limit groove 20; wherein, if the limit pin 10 is inserted into the limit groove 20, the two clamping members 3 are squeezed and deformed by the limit pin 10, and the clamping member 3 is suitable for limiting the limit pin 10 to prevent the transmission gear disc 2 from axially moving relative to the input shaft 1.

[0042] Some embodiments provide a working method of a gearbox, the working method comprising: When assembling the gearbox, the transmission gear disc 2 is sleeved on the outer wall of the input shaft 1 so that the limit groove 20 is aligned with the limit pin 10; if the limit pin 10 is not inserted into the limit groove 20, the transmission gear disc 2 is suitable for axial movement relative to the input shaft 1. At this time, when the transmission gear disc 2 is pulled upward, it is suitable for moving upward relative to the input shaft 1; if the limit pin 10 is inserted into the limit groove 20, the two clamping members 3 are squeezed and deformed by the limit pin 10, and the clamping members 3 are suitable for limiting the limit pin 10 to prevent the transmission gear disc 2 from axial movement relative to the input shaft 1.

[0043] To sum up, when assembling the gearbox, the transmission gear disc 2 is sleeved on the outer wall of the input shaft 1 so that the limit groove 20 is aligned with the limit pin 10; after the limit pin 10 is inserted into the limit groove 20, the two clamping parts 3 are squeezed to deform outward, and the clamping parts 3 are suitable for clamping and limiting the limit pin 10; after the assembly is completed, the transmission gear disc 2 is pulled upward to determine whether the limit pin 10 is inserted into the limit groove 20, thereby improving the efficiency of detection.

[0044] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is 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 of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0046] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gearbox for a variable frequency motor, characterized in that: include: An input shaft (1) having a limit pin (10) rotatably disposed thereon; A transmission gear disc (2) is sleeved on the outer wall of the input shaft (1) and is provided with a limit groove (20) adapted to the limit pin (10); Two clamping members (3), the two clamping members (3) being respectively arranged on two sides of the limiting groove (20), and the distance between the two clamping members (3) being smaller than the diameter of the limiting pin (10); Wherein, if the limiting pin (10) is not inserted into the limiting groove (20), the transmission gear plate (2) is suitable for axial movement relative to the input shaft (1); If the limit pin (10) is inserted into the limit groove (20), the two clamping members (3) are squeezed and deformed by the limit pin (10), and the clamping members (3) are suitable for limiting the limit pin (10) to prevent the transmission gear disc (2) from axially moving relative to the input shaft (1).

2. The gearbox for a variable frequency motor according to claim 1, characterized in that: The limiting groove (20) is semicircular, and the inner diameter of the limiting groove (20) is greater than the diameter of the limiting pin (10); After the limiting pin (10) abuts against the inner top wall of the limiting groove (20), when the input shaft (1) drives the transmission gear disc (2) to rotate, the limiting pin (10) is adapted to rotate relative to the limiting groove (20).

3. The gearbox for a variable frequency motor according to claim 2, characterized in that: The clamping member (3) is in an arc shape, with its lower end being arranged on the inner wall of the limiting groove (20) and its upper end passing through the limiting groove (20); The transmission gear plate (2) sleeve moves downward along the input shaft (1) until the limit pin (10) abuts against the inner top wall of the limit groove (20); The two clamping members (3) are suitable for clamping and limiting the limit pin (10) from two sides to prevent the limit pin (10) from being separated from the limit groove (20); An oil storage groove (21) is respectively formed on the inner walls of both sides of the limiting groove (20), and one oil storage groove (21) corresponds to one clamping member (3); The clamping member (3) is adapted to be inserted into the oil storage groove (21) when it is squeezed and deformed by the limiting pin (10), so that the grease in the oil storage groove (21) flows toward the outer wall of the limiting pin (10).

4. The gearbox for a variable frequency motor according to claim 3, characterized in that: The outer wall of the clamping member (3) is provided with a plurality of long openings (30) along the length direction, and an inclined angle is formed between the long openings (30) and the axis of the limiting pin (10); When the limiting pin (10) rotates relative to the clamping member (3), the elongated opening (30) is suitable for scraping off excess grease on the outer wall of the limiting pin (10).

5. The gearbox for a variable frequency motor according to claim 1, characterized in that: The input shaft (1) passes through the gear box housing (4), and a linkage gear plate (5) is rotatably arranged in the housing (4), and the linkage gear plate (5) and the transmission gear plate (2) are meshed with each other.

6. A gearbox for a variable frequency motor, characterized in that: include: An outer shell (4) having a linkage gear plate (5) rotatably disposed therein, wherein the linkage gear plate (5) is sleeved on the outer wall of the output shaft; An input shaft (1) passes through the housing (4), and a limit pin (10) is rotatably provided on the input shaft (1); A transmission gear disc (2) is sleeved on the outer wall of the input shaft (1) and is provided with a limit groove (20) adapted to the limit pin (10); Two clamping members (3), the two clamping members (3) being respectively arranged on two sides of the limiting groove (20), and the distance between the two clamping members (3) being smaller than the diameter of the limiting pin (10); The clamping member (3) is in an arc shape, with its lower end being arranged on the inner wall of the limiting groove (20) and its upper end passing through the limiting groove (20); Wherein, if the limit pin (10) is inserted into the limit groove (20), the two clamping members (3) are squeezed and deformed by the limit pin (10), and the clamping members (3) are suitable for limiting the limit pin (10) to prevent the transmission gear disc (2) from axially moving relative to the input shaft (1).

7. The gearbox for a variable frequency motor according to claim 6, characterized in that: The limiting groove (20) is semicircular, and the inner diameter of the limiting groove (20) is greater than the diameter of the limiting pin (10); After the limiting pin (10) abuts against the inner top wall of the limiting groove (20), when the input shaft (1) drives the transmission gear disc (2) to rotate, the limiting pin (10) is adapted to rotate relative to the limiting groove (20).

8. The gearbox for a variable frequency motor according to claim 7, characterized in that: An oil storage groove (21) is respectively formed on the inner walls of both sides of the limiting groove (20), and one oil storage groove (21) corresponds to one clamping member (3); The clamping member (3) is adapted to be inserted into the oil storage groove (21) when it is squeezed and deformed by the limiting pin (10), so that the grease in the oil storage groove (21) flows toward the outer wall of the limiting pin (10).

9. The gearbox for a variable frequency motor according to claim 8, characterized in that: The outer wall of the clamping member (3) is provided with a plurality of long openings (30) along the length direction, and an inclined angle is formed between the long openings (30) and the axis of the limiting pin (10); When the limiting pin (10) rotates relative to the clamping member (3), the elongated opening (30) is suitable for scraping off excess grease on the outer wall of the limiting pin (10).

10. A method for operating a gearbox, characterized in that: Using the variable frequency motor gearbox according to any one of claims 1 to 9, the working method comprises: When assembling the gearbox, the transmission gear plate (2) is sleeved on the outer wall of the input shaft (1) so that the limiting groove (20) is aligned with the limiting pin (10); If the limiting pin (10) is not inserted into the limiting groove (20), the transmission gear plate (2) is adapted to move axially relative to the input shaft (1). At this time, when the transmission gear plate (2) is pulled upward, it is adapted to move upward relative to the input shaft (1); If the limit pin (10) is inserted into the limit groove (20), the two clamping members (3) are squeezed and deformed by the limit pin (10), and the clamping members (3) are suitable for limiting the limit pin (10) to prevent the transmission gear disc (2) from axially moving relative to the input shaft (1).

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