Gear and gear shaft preassembling structure and assembling tool

Abstract

The utility model relates to a preassembling structure of a gear and a gear shaft, which comprises the gear and the gear shaft, the gear is provided with an assembling groove, the assembling groove sequentially comprises a first vertical section, a first inclined section, a second vertical section and a second inclined section from top to bottom, and the first inclined section and the second inclined section are arranged in an inclined mode from inside to outside. A first assembling section and a second assembling section are arranged at the upper end of the gear shaft, the second assembling section is located below the first assembling section, the upper end face of the second assembling section is obliquely arranged to form a step face, and the small opening end of the step face and the lower end of the first assembling section are matched to form a whole. A gap is formed between the first vertical section and the first assembling section, and a gap is formed between the second vertical section and the second assembling section. By the adoption of the technical scheme, the gear and gear shaft preassembling structure and the assembling tool are provided, the preassembling structure is additionally arranged on the gear and the gear shaft in advance, the gear and the gear shaft can be conveniently placed on the tool to be assembled subsequently, the tool is simplified, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a pre-installed structure of a gear and a gear shaft and an assembly tool. Background Art

[0002] Gear transmission is the most widely used form of transmission in mechanical transmission. Gear transmission can be used to transfer the transmission of one shaft to another shaft to achieve the purpose of speed change, reversing, etc.

[0003] There are generally two types of fit between gears and shafts: there is a gap and an interference fit between them. When assembling the former, you only need to align the shaft and gear and gently insert them at the right position and angle, while the latter is more complicated and has hot-installation and cold-installation methods. The hot-installation method uses the principle of thermal expansion and contraction to heat the inner hole of the gear to enlarge it and then assemble it with the shaft and cool it down. The cold-installation method is to assemble directly at room temperature. When the interference is small, it can be hit with a heavy hammer, and when the interference is large, tools are required. Generally, an assembly tool is used, including a base, an alignment platform for installing the gear shaft, and a floating platform for installing the gear. A guide column is provided on the base, and a pressure rod is slid on the guide seat. The positioning platform is fixed on the base, and the floating platform is detachably set on the base through a connecting rod and is located above the positioning platform. When assembling, the gear and the gear shaft are placed on the bass platform respectively, and then the driving member drives the pressure rod to slide downward, presses the floating platform downward, and sets a reset spring on the gear shaft of the gear device and the connecting rod to drive the floating platform to reset upward.

[0004] The above-mentioned assembly tooling needs to adjust the position of the floating platform first when assembling gears and gear shafts so that its position is accurate with the fixed platform and the assembled workpiece is not skewed. In addition, when assembling gears and gear shafts of different sizes, the platform needs to be replaced, resulting in low assembly efficiency, high labor intensity for workers, and time-consuming and labor-intensive operation, which cannot meet the requirements of mass production. Summary of the invention

[0005] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a pre-installed structure and assembly tooling for gears and gear shafts, and pre-adds a pre-installed structure to the gears and gear shafts to facilitate subsequent placement on the tooling for assembly, thereby simplifying the tooling and improving assembly efficiency.

[0006] The technical solution of the utility model: a pre-installed structure of a gear and a gear shaft, comprising a gear and a gear shaft, wherein an assembly groove is provided on the gear, and the assembly groove comprises a first vertical section, a first inclined section, a second vertical section and a second inclined section from top to bottom, wherein the first inclined section and the second inclined section are both inclined from the inside to the outside, and the upper end portion of the gear shaft is provided with a first assembly section and a second assembly section, wherein the second assembly section is located below the first assembly section, and the upper end face of the second assembly section is inclined to form a step surface, wherein the small end of the step surface cooperates with the lower end of the first assembly section to form a whole, and during pre-installation, the upper end of the gear shaft is located in the assembly groove, and a gap is provided between the first vertical section and the first assembly section, and a gap is provided between the second vertical section and the second assembly section.

[0007] By adopting the above technical solution, the gear sleeve is arranged outside the gear shaft to form a pre-installed structure. The first assembly section and the second assembly section of the gear shaft are located in the assembly groove, and the first assembly section is located on the inner side of the first vertical section and forms a gap with the first vertical section. The second assembly section is located on the inner side of the second vertical section and forms a gap with the second vertical section. The two parts are optimized to reduce subsequent tooling positioning and have a high assembly effect.

[0008] A further configuration of the utility model is that a through hole is provided at the center of the gear shaft along its vertical direction.

[0009] It is further provided that a positioning boss is provided on the outer periphery of the gear shaft, and the positioning boss is located below the second assembly section.

[0010] The above further configuration is adopted to facilitate the subsequent installation and positioning of the gear shaft.

[0011] An assembly tool comprises a base and a guide rod vertically arranged on the base, wherein the base is provided with a positioning platform for installing a gear shaft, and a pressure piece is slidably provided on the guide rod. Under the action of external force, the pressure piece slides downward on the guide rod and drives the gear to slide downward to achieve assembly with the gear shaft. At this time, the first vertical section and the second assembly section are interference fit.

[0012] With the above arrangement, during assembly, the gear shaft is placed on the positioning platform and the gear is placed on the gear shaft. Due to the pre-installed structure of the gear and the gear shaft, the gear and the gear shaft are pre-positioned, and the pressing piece only needs to perform a downward pressing action to complete the installation of the gear and the gear shaft. The first vertical section and the second assembly section have an interference fit, which simplifies the tooling structure, improves assembly efficiency, eliminates the need for repeated adjustments, and has a small assembly error.

[0013] The utility model is further configured as follows: a positioning groove is provided at the center of the positioning platform, a positioning shaft is provided in the positioning groove, the lower end of the gear shaft is placed in the positioning groove, the positioning shaft is inserted in the through hole, and the positioning boss is set on the upper end surface of the positioning platform.

[0014] By adopting the above further arrangement, the gear shaft structure is stable and is easy to assemble with the gear.

[0015] The utility model is further configured that: a baffle is provided at the upper end of the guide rod.

[0016] The above further configuration is adopted to prevent the pressing member from being separated from the guide rod when sliding upward, thereby affecting the next assembly.

[0017] The utility model is further configured as follows: a guide sleeve is provided on the outer periphery of the guide rod, and the guide sleeve is connected to the pressing member and slides synchronously.

[0018] By further adopting the above-mentioned arrangement, the guide rod and the pressure piece are subject to wear and tear, and a guide sleeve is added. After long-term use, only the guide sleeve needs to be replaced. At the same time, since the shaft hole is directly processed on the pressure piece, the precision is low. By adding a guide sleeve, the processing precision can be improved, so that the sliding effect between the pressure piece and the guide rod is good. The guide sleeve is installed on the pressure piece by screws, which is convenient for disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the gear and gear shaft of a specific embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of a gear and a gear shaft of a specific embodiment of the utility model;

[0021] Figure 3 for Figure 2 A magnified view of part A;

[0022] Figure 4 It is a schematic diagram of a gear shaft of a specific embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of an assembly tool for a specific embodiment of the utility model;

[0024] Figure 6 It is a cross-sectional view of an assembly tool for a specific embodiment of the utility model;

[0025] Figure 7 for Figure 6 Magnified view of part B.

[0026] In the figure, 1, gear; 11, assembly groove; 111, first vertical section; 112, first inclined section; 113, second vertical section; 114, second inclined section; 2, gear shaft; 21, first assembly section; 22, second assembly section; 221, step surface; 23, through hole; 24, positioning boss; 3, base; 4, guide rod; 41, baffle; 42, guide sleeve; 5, positioning platform; 51, positioning groove; 52, positioning shaft; 6, pressure piece; 61, sliding plate; 62, pressure rod. DETAILED DESCRIPTION

[0027] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] like Figure 1-7As shown, a pre-assembled structure of a gear and a gear shaft comprises a gear 1 and a gear shaft 2, wherein the gear 1 is provided with an assembly groove 11, wherein the assembly groove 11 comprises, from top to bottom, a first vertical section 111, a first inclined section 112, a second vertical section 113 and a second inclined section 114, wherein the first inclined section 112 and the second inclined section 114 are both arranged to be inclined from the inside to the outside, wherein the upper end portion of the gear shaft 2 is provided with a first assembly section 21 and a second assembly section 22, wherein the second assembly section 22 is located below the first assembly section 21, wherein the upper end surface of the second assembly section 22 is arranged to be inclined to form a step surface 221, wherein the small end of the step surface 221 cooperates with the lower end of the first assembly section 21 It forms an integral body. During pre-installation, the upper end of the gear shaft 2 is located in the assembly groove 11, a gap is provided between the first vertical section 111 and the first assembly section 21, and a gap is provided between the second vertical section 113 and the second assembly section 22. The gear 1 is sleeved on the outside of the gear shaft 2 to form a pre-installed structure. The first assembly section 21 and the second assembly section 22 of the gear shaft 2 are located in the assembly groove 11, and the first assembly section 21 is located on the inner side of the first vertical section 111 and forms a gap with the first vertical section 111. The second assembly section 22 is located on the inner side of the second vertical section 113 and forms a gap with the second vertical section 113. The two parts are optimized to reduce subsequent tooling positioning and have a high assembly effect.

[0032] A through hole 23 is provided at the center of the gear shaft 2 along its vertical direction, and a positioning boss 24 is provided on the periphery of the gear shaft 2. The positioning boss 24 is located below the second assembly section to facilitate the subsequent installation and positioning of the gear shaft 2.

[0033] An assembly tool includes a base 3 and a guide rod 4 vertically arranged on the base 3, wherein the base 3 is provided with a positioning platform 5 for installing a gear shaft 2, and a pressing piece 6 is slidably provided on the guide rod 4. The pressing piece 6 slides downward on the guide rod 4 under the action of an external force, and drives the gear 1 to slide downward to achieve assembly with the gear shaft 2. At this time, the first vertical section 111 and the second assembly section 22 are interference-fitted. During assembly, the pressing piece 6 includes a sliding plate 61 and a pressing rod 62 that are integrally arranged or fixedly connected. The sliding plate 61 slides on the guide rod 4. The upper end surface of the sliding plate 61 is provided with a connecting portion 611 connected to an external driving member. The external driving member can be a cylinder or a motor. The gear shaft 2 is placed on the positioning platform 5, and the gear 1 is placed on the gear shaft 2. Due to the pre-installed structure of the gear 1 and the gear shaft 2, the gear 1 and the gear shaft 2 are pre-positioned. The pressing member 6 only needs to perform a downward pressing action to complete the installation of the gear 1 and the gear shaft 2. The first vertical section 111 and the second assembly section have an interference fit, which simplifies the tooling structure, improves assembly efficiency, does not require repeated adjustments, and has a small assembly error.

[0034] A positioning groove 51 is provided at the center of the positioning platform 5, and a positioning shaft 52 is provided in the positioning groove 51. The lower end of the gear shaft 2 is placed in the positioning groove 51, and the positioning shaft 52 is inserted in the through hole 23. The positioning boss 24 is built on the upper end surface of the positioning platform 5. The gear shaft 2 has a stable structure and is easy to assemble with the gear 1.

[0035] The upper end of the guide rod 4 is provided with a baffle 41 to prevent the pressing member 6 from being separated from the guide rod 4 when sliding upward, which would affect the next assembly. The outer periphery of the guide rod 4 is provided with a guide sleeve 41, which is connected to the pressing member 6 and slides synchronously. The guide rod 4 and the pressing member 6 are worn, and the guide sleeve 41 is added. After long-term use, only the guide sleeve 41 needs to be replaced. At the same time, because the shaft hole is directly processed on the pressing member 6, the precision is low. By adding the guide sleeve 41, the processing precision can be improved, so that the sliding effect between the pressing member 6 and the guide rod 4 is good. The guide sleeve is installed on the pressing member 6 by screws, which is easy to disassemble and replace.

Claims

1. A pre-assembled structure of a gear and a gear shaft, comprising a gear (1) and a gear shaft (2), characterized in that: The gear (1) is provided with an assembly groove (11), and the assembly groove (11) includes, from top to bottom, a first vertical section (111), a first inclined section (112), a second vertical section (113), and a second inclined section (114), the first inclined section (112) and the second inclined section (114) being arranged to be inclined from the inside to the outside. The upper end of the gear shaft (2) is provided with a first assembly section (21) and a second assembly section (22), the second assembly section (22) being located below the first assembly section (21), the upper end surface of the second assembly section (22) being arranged to be inclined to form a step surface (221), the small end of the step surface (221) being matched with the lower end of the first assembly section (21) to form a whole, and when pre-assembled, the upper end of the gear shaft (2) is located in the assembly groove (11), a gap is provided between the first vertical section (111) and the first assembly section (21), and a gap is provided between the second vertical section (113) and the second assembly section (22).

2. The pre-assembled structure of gears and gear shafts according to claim 1, characterized in that: A through hole (23) is provided at the center of the gear shaft (2) along its vertical direction.

3. The pre-assembled structure of gears and gear shafts according to claim 1 or 2, characterized in that: A positioning boss (24) is provided on the outer periphery of the gear shaft (2), and the positioning boss (24) is located below the second assembly section (22).

4. An assembly tool for assembling the pre-assembled structure of the gear and the gear shaft according to any one of claims 1 to 3, characterized in that: The invention comprises a base (3) and a guide rod (4) vertically arranged on the base (3); a positioning platform (5) for mounting a gear shaft (2) is provided on the base (3); a pressing member (6) is slidably provided on the guide rod (4); the pressing member (6) slides downward on the guide rod (4) under the action of an external force and drives the gear (1) to slide downward to achieve assembly with the gear shaft (2); at this time, the first vertical section (111) and the second assembly section (22) are in interference fit.

5. The assembly tool according to claim 4, characterized in that: A positioning groove (51) is provided at the center of the positioning platform (5), a positioning shaft (52) is provided in the positioning groove (51), the lower end of the gear shaft (2) is placed in the positioning groove (51), the positioning shaft (52) is inserted in the through hole (23), and the positioning boss (24) is arranged on the upper end surface of the positioning platform (5).

6. The assembly tool according to claim 4, characterized in that: A baffle (41) is provided at the upper end of the guide rod (4).

7. The assembly tool according to claim 5 or 6, characterized in that: A guide sleeve (42) is provided on the outer periphery of the guide rod (4), and the guide sleeve (42) is connected to the pressing member (6) and slides synchronously.

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