Continuous shaft coaxial two-stage transmission reducing mechanism provided with adjusting key and convenient to install

Abstract

A connecting shaft coaxial two-stage transmission reducing mechanism provided with an adjusting key and convenient to install comprises a box body, the box body is internally provided with an input shaft, and the end, located in the box body, of the input shaft is provided with an input connecting shaft gear; the number of the driven gears is two, the two driven gears are symmetrical along the input shaft, and the two driven gears are meshed with the input connecting shaft gear; the two transmission shafts correspond to the driven gears respectively, driving gears coaxial with the driven gears are arranged at one ends of the transmission shafts, and adjusting structures are arranged at the connecting positions of the transmission shafts and the driven gears; and the output gear is rotationally arranged in the box body and is meshed with the two driving gears at the same time. The adjusting structure is arranged between the driven gear and the transmission shaft, and an adjusting space can be defined between the driven gear and the transmission shaft in the assembling process, so that the driven gear and the input connecting shaft gear are reliably assembled.

Description

Technical Field

[0001] The present invention relates to the technical field of speed reducers, and particularly to a speed reducer structure with a two-stage reduction and an adjustment keyway for easy assembly. Background Art

[0002] In coaxial speed reducers, planetary gear speed reducers are usually adopted. Relatively speaking, the axial space of planetary gears is larger, and a planet carrier, planetary gears and a sun gear need to be arranged in terms of structure. Therefore, the planetary gear speed reducer is relatively complex in structure. At present, there is a design scheme of a two-stage reduction mechanism on the market, in which driven gears are symmetrically arranged on both sides of the input gear, so as to offset the radial force through the mutual cooperation of the two driven gears, and then achieve the functions of speed reduction, torque increase and power transmission.

[0003] During the actual assembly process of the speed reducer, it is found that when a two-axis driving gear and an output gear are meshed and installed according to the center distance of the gears, the first-stage driven gear coaxial with the two-axis driving gear can be accurately meshed by the free rotation of the input gear when it is locked by a flat key. However, when a set of first-stage driven gears and the coaxial two-axis driving gear are meshed with the input gear and the output gear, the circumferential positions of the input gear and the output gear are locked. When installing another set of two-axis driving gears and the first-stage driven gears locked with their circumferences, it is impossible to ensure that the first-stage driven gear and the input gear as well as the two-axis driving gear and the output gear are exactly tooth tip against tooth root. This kind of misalignment situation is difficult to avoid. Especially in speed reducers, helical gears are mostly used. Therefore, when one gear is fixed and the other gear is assembled, the other gear needs to be able to rotate around the axis during assembly to achieve precise assembly. Therefore, the above-mentioned misalignment is difficult to avoid, and it can only be compensated by increasing the force for assembling the gears during the assembly process to forcibly make up for the misalignment, but only the misalignment situation can be reduced, and it cannot be eliminated.

[0004] Therefore, to overcome this defect, a speed reducer structure with a two-stage reduction and an adjustment keyway for easy assembly is specifically designed to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a speed reducer structure with a two-stage reduction and an adjustment keyway for easy assembly to solve the above technical problems. The present invention adopts the following technical solutions:

[0006] A continuous shaft coaxial two-stage transmission reduction mechanism with an adjustment key for easy installation, including a box body, and the following are assembled inside the box body:

[0007] An input shaft, one end of the input shaft is rotatably connected to the box body, and an input coupling gear is arranged at the end of the input shaft inside the box body;

[0008] An output shaft, which is rotatably connected to the other side of the box body opposite to the input shaft, is coaxially arranged with the input shaft, and an output gear is arranged at the end of the output shaft located inside the box body. A bearing mounting position for rotatably connecting the end of the input shaft therein is formed on the end face of the output gear facing the input shaft;

[0009] Two driven gears, which are arranged symmetrically along the input shaft and are both meshed with the input coupling gear;

[0010] Two drive shafts, which are respectively corresponding to the driven gears, and both ends of which are respectively rotatably connected to the inner wall of the box body. A driving gear coaxial with the driven gear is arranged at one end of the drive shaft, and the two driving gears are simultaneously meshed with the output gear to drive the output shaft to output power; The other end of the drive shaft is key-connected to the driven gear, and an adjustment structure is arranged at the connection position between the drive shaft and the driven gear. The adjustment structure enables the driven gear and the drive shaft to have an adjustment space for rotating along the axis during the assembly process, and the adjustment space is filled and closed after the assembly is completed.

[0011] Further, the adjustment structure includes:

[0012] A keyway, which is formed on the inner wall of the drive shaft hole of the driven gear for assembling the drive shaft;

[0013] A main key, which is formed on the circumferential surface of the drive shaft and is used to pass through the keyway. The width dimension of the main key is smaller than the width dimension of the keyway. When the drive shaft is installed on the driven gear, the keyway defines the adjustment space on both sides of the main key to provide a space for the driven gear and the drive shaft to rotate around the axis;

[0014] A secondary key, which is used to fill and close the adjustment space.

[0015] Further, at least two symmetrically arranged keyways are formed on the inner wall of the drive shaft hole, and correspondingly, at least two symmetrically arranged main keys are formed on the drive shaft.

[0016] Further, an output shaft hole penetrating the output gear for key-connecting with the output shaft is formed on the output gear, and the bearing mounting position is formed at the end of the output shaft hole facing the input shaft.

[0017] Further, the box body includes:

[0018] A housing, inside which there is a containing space.

[0019] End caps, which are hermetically installed at both ends of the housing to enclose the containing space.

[0020] On the inner wall of the housing, there is also a current collecting structure for collecting the gear oil splashed to the top of the containing space due to meshing movement and flowing it to the driving gear located on the upper side.

[0021] Furthermore, the current collecting structure includes a current collecting plate formed on the inner wall of the housing. The current collecting plate is located above the driving gear, one end of which is formed on the inner wall of the housing and the other end extends towards the driving gear. And a number of current collecting grooves are formed on the current collecting plate.

[0022] Furthermore, the current collecting plate is inclined towards the direction away from the driven gear.

[0023] Furthermore, a number of the current collecting grooves extend from the root to the end of the current collecting plate, and a number of the current collecting grooves extend radially from the end of the current collecting plate towards the root of the current collecting plate.

[0024] Furthermore, the width dimension of each current collecting groove gradually decreases from the root to the end of the current collecting plate.

[0025] The beneficial effects produced by the present invention are as follows:

[0026] The embodiment of the present invention provides a connecting shaft coaxial two-stage transmission reduction mechanism with an adjustment key for easy installation. During the assembly process, the passive gear, the transmission shaft and the driving gear located on the same side constitute a group of reduction gear sets. The two groups of reduction gear sets simultaneously complete the reduction and power transmission. First, the assembly of one group of reduction gear sets with the input coupling gear and the output gear is completed. When completing the assembly of the passive gear, the driving gear, the input coupling gear and the output gear on one side, there is a movable assembly space and a degree of freedom of rotation between the various components. Therefore, the assembly on one side can be easily completed and can be assembled accurately, so that the tooth tips and tooth roots on the two meshing gears correspond to each other, so as to ensure the reliability in the meshing transmission process. At this time, due to the input coupling The gear and the output gear are meshed and connected via a set of reduction gear sets. The circumferential positions of the input coupling gear and the output gear have been locked. During the process of assembling another set of passive gears, the transmission shaft and the active gear, the passive gear and the transmission shaft are key-connected and an adjustment structure is provided. Through the adjustment structure, a space for the transmission shaft and / or the passive gear to rotate can be generated between the key-connected transmission shaft and the passive gear. During the process of assembling with the output gear and the input coupling gear, the transmission shaft or the passive gear can be rotated, thereby completing the precise assembly of the reduction gear set with the output gear and the input coupling gear, ensuring that the tooth tips and tooth roots in the two meshing gears correspond to each other, and ensuring reliability during the transmission process.

[0027] During the power transmission process, the input shaft is connected to the drive motor, so that the power of the drive motor is input to the reducer. It can be known that a section of the input shaft is connected to the housing through gear rotation, and an input coupling gear is formed on the end located inside the housing. The two passive gears are symmetrically located on both sides of the input coupling gear and mesh with the input coupling gear. At the same time, the two active gears are symmetrically located on both sides of the output gear and mesh with the output gear at the same time. In the process of power transmission by the rotation of the input shaft, the input coupling gear and the two passive gears are meshed with each other to achieve the effect of speed reduction and torque increase. In this process, two groups of reduction gear groups composed of passive gears, transmission shafts and active gears are symmetrically arranged on both sides of the input coupling gear and the output gear, so that the radial force borne by the bearings can be offset against each other, so that the bearing load is smaller, the efficiency loss is reduced, and the efficiency of power output is ensured.

[0028] Compared with the existing technology, it has the following advantages:

[0029] 1. In the secondary deceleration of the present invention, power is transmitted to two driven gears through an input coupling gear, enabling the tooth surfaces on both sides of the input coupling gear to mesh with the driven gears simultaneously. Under the same modulus and rotational speed, the transmitted power is twice that of the conventional one-to-one gear matching. Gears with a smaller modulus can be used to transmit a larger torque, and the stability is improved, the noise is reduced, and the efficiency is increased.

[0030] 2. The present invention uses two driven gears to clamp an input coupling gear, completely canceling out the inevitable radial forces in gear transmission, reducing friction, temperature rise, and noise, and improving the transmission efficiency and reliability simultaneously.

[0031] 3. Two driving gears are used to clamp and drive the output gear, also enabling a smaller modulus to achieve a torque output twice as large. Similarly, the inevitable radial forces in gear transmission are completely canceled out, reducing friction, temperature rise, and noise, and improving the transmission efficiency and reliability simultaneously.

[0032] 4. The present invention can achieve coaxial transmission, which has four major advantages compared to the coaxial transmission of planetary speed reducers: ① Fewer components, a more compact structure, and lower manufacturing costs. ② The maximum reduction and torque increase achievable by a single-stage reduction of a planetary speed reducer should not exceed 5 times, while the speed reducer of the present invention can achieve a reduction and torque increase of 8 times in a single-stage reduction. ③ When a reduction and torque increase of more than 10 times are required, a planetary speed reducer needs two-stage reduction, resulting in the axial length of the speed reducer being close to 1:1 to its diameter size. In the case of the same two-stage reduction and the same reduction ratio, the axial length of the speed reducer of the present invention is only about 30% of its radial size. When the axial size of the speed reducer is limited, the axial length of the two-stage reduction of this speed reducer is shorter than that of the single-stage reduction of the planetary speed reducer, having the advantage of a smaller axial size. ④ In a planetary speed reducer, the power is output by the bracket driven by the planetary gears, but one end of the bracket for installing the planetary gears is in an open state, resulting in insufficient structural rigidity, which is an important source of efficiency loss for this type of speed reducer. In the speed reducer of the present invention, all transmission parts are firmly fixed in position by bearings, and there is no open situation on one side, greatly improving the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the present invention.

[0034] Figure 2 is an exploded structural diagram of the present invention.

[0035] Figure 3 is an exploded structural diagram of the driven gear and the transmission shaft in the present invention.

[0036] Figure 4 is a schematic structural diagram of the driven gear and the transmission shaft in the assembled state in the present invention.

[0037] Figure 5 is Figure 4 a sectional view taken along the A-A direction in

[0038] Figure 6 a side view of the present invention.

[0039] Figure 7 is Figure 6 a sectional view taken along the B-B direction in

[0040] Figure 8 a schematic structural view of the housing in the present invention.

[0041] In the figure: 100 - box body; 200 - input shaft; 210 - input coupling gear; 300 - driven gear; 310 - transmission shaft; 320 - driving gear; 301 - adjustment space; 400 - output gear; 302 - keyway; 303 - main key; 304 - secondary key; 305 - transmission shaft hole; 110 - housing; 120 - end cover; 130 - busbar plate; 131 - busbar groove; 411 - output shaft hole; 201 - mounting part;. Specific Embodiments

[0042] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the embodiments does not limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0043] The present invention patent provides a speed reducer structure with a secondary deceleration that has an adjustment keyway 302 for easy assembly. It has an input shaft 200 that is connected to the motor drive to input power. An input coupling gear 210 is formed at one end of the input shaft 200 located inside the housing 100. The output shaft (not shown in the figure) is coaxially arranged with the input shaft inside the housing and is rotatably connected to another side of the housing at one end. At the same time, an output gear is provided at one end of the output shaft located inside the housing. A bearing mounting position for the rotation connection of the end of the input shaft located inside the housing is provided on the end face of the output gear facing the input shaft, so that the input shaft can be rotatably connected to the end face of the output gear, and then the input shaft and the output shaft form a continuous shaft structure that can rotate at different speeds respectively. Two driven gears 300 are arranged on both sides of the input coupling gear 210 and are simultaneously meshed with the input coupling gear 210. At the same time, one end of a transmission shaft 310 is coaxially connected to the driven gear 300 and an output gear 400 meshed with it is provided at the other end. The output gear 400 is used to drive the output shaft to output power, so as to play a role in transmitting power after decelerating and increasing torque.At this time, the driven gear 300, the transmission shaft 310, and the driving gear 320 located on the same side form a set of reduction gear sets. At this time, an adjustment structure is provided between the driven gear 300 and the transmission shaft 310, which can define an adjustment space 301 between the driven gear 300 and the transmission shaft during the assembly process, so that the driven gear 300 and the transmission shaft 310 can rotate around the axis; during assembly, when a set of reduction gear sets, the output gear 400, and the input coupling gear 210 are assembled, the circumferential positions of the output gear 400 and the input coupling gear 210 are locked at this time. At this time, the four gears have formed an accurate gear meshing structure. As long as the input gear rotates, the other three gears will linearly follow, so it is very difficult to move. At this time, during the assembly of another set of reduction gear sets with the output gear 400 and the input coupling gear 210 whose circumferential positions are locked, the driven gear 300 and the transmission shaft 310 can rotate through the adjustment structure. Furthermore, by respectively rotating the driven gear 300 or the transmission shaft 310 (the end of the transmission shaft 310 is formed with a driving gear 320, and rotating the transmission shaft 310 can drive the driving shaft to rotate), the driven gear 300 and the input coupling gear 210 can be reliably assembled, that is, the tip part of the driven gear 300 can penetrate into the root part of the input coupling gear 210. Similarly, the driving gear 320 can also achieve reliable assembly with the output gear 400. After the assembly is completed, the adjustment space 301 of the adjustment structure is filled, thus eliminating the rotation space, and accurate power transmission can be achieved. Through the adjustment structure, during the assembly process of the speed reducer, the gears that mesh with each other in each group of the speed reducer can continue to mesh accurately, and the situation of mutual misalignment can be eliminated, that is, it can be ensured that the tips and roots of the gears that mesh with each other can correspond to each other, and further, it can be ensured that the meshing gears can reliably transmit power.

[0044] Specifically, as Figures 1-5 shown, the present invention provides a speed reducer structure with two-stage reduction that has an adjustment keyway 302 for easy assembly, including a housing 100. An input shaft 200, an output shaft (not shown in the figure), a driven gear 300, a transmission shaft 310, and an output gear 400 are assembled within the housing 100.

[0045] Wherein, one end of the input shaft is rotatably connected to the housing 100, and an input coupling gear 210 is provided at the end of the input shaft 200 within the housing 100; the output shaft is rotatably connected to the other side of the housing corresponding to the input shaft and is coaxially arranged with the input shaft. An output gear is provided on the part of the output shaft within the housing, and a bearing mounting position for the end of the input shaft to rotatably connect therein is provided on the end face of the output gear facing the input shaft.

[0046] The driven gears 300 are provided in two and are symmetrically arranged along the input shaft 200, and both are meshed with the input coupling gear 210; the transmission shafts are provided in two corresponding to the driven gears 300 respectively. Both ends of the two transmission shafts are rotatably connected to the inner wall of the box body. One end of the transmission shaft 310 is provided with a driving gear 320 coaxial with the driven gear 300. The two driving gears are arranged on both sides of the output gear and are simultaneously meshed with the output gear to drive the power output of the output shaft. The other end of the transmission shaft is key-connected to the driven gear 300, and an adjustment structure is provided at the connection position between the transmission shaft 310 and the driven gear 300. The adjustment structure enables the driven gear 300 and the transmission shaft 310 to have an adjustment space 301 for axial rotation during the assembly process, and the adjustment space 301 is filled and closed after the assembly is completed; it can be known that the diameter sizes of the driven gear 300 and the driving gear 320 are one large and one small, so as to achieve the purpose of secondary deceleration.

[0047] During the assembly process, the driven gear 300, the transmission shaft 310 and the driving gear 320 on the same side form a set of reduction gear sets. The two sets of reduction gear sets complete deceleration and power transmission at the same time. First, complete the assembly work of a set of reduction gear sets with the input coupling gear 210 and the output gear 400. Since there is an assembly space for movement and a degree of freedom for rotation between each component when completing the assembly of the driven gear 300, the driving gear 320 on one side with the input coupling gear 210 and the output gear 400, the assembly on one side can be easily completed and can be assembled accurately, so that the tooth tips and tooth roots on the two meshing gears correspond to each other to ensure the reliability during the meshing transmission process. At this time, since the input coupling gear 210 and the output gear 400 are meshed and connected through a set of reduction gear sets, the circumferential positions of the input coupling gear 210 and the output gear 400 have been locked, and an accurate gear meshing and matching relationship has been formed among the four gears. As long as the input gear rotates, the other three gears linearly follow. During the assembly process of the other set of driven gear 300, transmission shaft 310 and driving gear 320, a key connection is made between the transmission shaft 310 and the driven gear 300 and an adjustment structure is provided. Through this adjustment structure, a space for the transmission shaft 310 and / or the driven gear 300 to rotate can be generated between the key-connected transmission shaft 310 and the driven gear 300. During the assembly process with the output gear 400 and the input coupling gear 210, the transmission shaft 310 or the driven gear 300 can be rotated, so as to complete the accurate assembly of the reduction gear set with the output gear 400 and the input coupling gear 210, ensure that the tooth tips and tooth roots of the two meshing gears correspond to each other, and ensure the reliability during the transmission process.

[0048] During the power transmission process, the input shaft 200 is drivingly connected to the driving motor, thereby inputting the power of the driving motor into the reduction gear. It can be known that one end of the input shaft 200 is rotatably connected to the housing 100 through a bearing, and an input coupling gear 210 is formed on the end portion located inside the housing 100. Two driven gears 300 are respectively symmetrically located on both sides of the input coupling gear 210 and mesh with the input coupling gear 210. At the same time, two driving gears 320 are respectively symmetrically located on both sides of the output gear 400 and mesh with the output gear 400 simultaneously. Therefore, during the process of the input shaft 200 rotating for power transmission, the function of reducing speed and increasing torque is achieved through the meshing of the input coupling gear 210 with the two driven gears 300. During this process, two reduction gear sets composed of the driven gear 300, the transmission shaft 310, and the driving gear 320 are symmetrically arranged on both sides of the input coupling gear 210 and the output gear 400, so that the radial force borne by the bearing can be offset from each other, making the bearing load smaller, reducing efficiency loss, and ensuring the efficiency of power output. At the same time, during the power transmission process, the input shaft and the output shaft are coaxially arranged, and the end portion of the input shaft is rotatably connected within the bearing mounting position of the output gear through a bearing, so that the input shaft and the output shaft form a continuous shaft structure that can rotate at different speeds. The bearing mounting position at the end of the output gear can not only constitute the positioning support of the output shaft but also the positioning support of the input shaft, ensuring that the input shaft and the output shaft can rotate at different speeds in a completely concentric state, thereby achieving the purpose of reducing speed and increasing torque. At the same time, setting the input shaft and the output shaft coaxially and forming a continuous shaft structure that can rotate at different speeds respectively can achieve higher reduction efficiency when transmitting power coaxially compared with a coaxial planetary gear reducer. It is worth noting that during the power transmission process, the two reduction gear sets are symmetrically arranged on both sides of the input shaft 200, so that during the power transmission process, the generated radial force can be offset. Therefore, when the radial forces on the input shaft 200 and the output gear 400 are offset, the rotatably connected input shaft 200 and output gear 400 can remain stable and the efficiency loss can be reduced.

[0049] During the transmission process, the input coupling gear on the input shaft meshes with two driven gears on both radial sides. Since the number of teeth of the driven gear is N times that of the input coupling gear, a primary reduction is formed. The advantages of this structure are as follows: ① Since the driven gears on both radial sides of the input coupling gear clamp it, the radial force generated during the operation of the input coupling gear is completely offset, thereby reducing friction, lowering temperature rise, and improving reliability. ② Under normal circumstances, the input coupling gear only outputs power through one radial side, while in this structure, it outputs power through both sides, resulting in a doubling of the output power and torque of gears with the same module. Moreover, due to better stability, the actual output power and torque are increased by more than 1 time.

[0050] Two driven gears are respectively mounted on the transmission shaft, locked through the key grooves and keys of the driven gears and the transmission shaft, and transmit power to the coaxial driving gear. Then, the driving gear meshes with the output gear from both radial sides of the output gear, which also cancels out the radial force of the output gear. The power and torque output by the gears with the same module are more than twice that of the conventional single-gear meshing structure, and two-stage reduction can be achieved under the condition that the axial dimension is very short (only equivalent to the axial length of one-stage reduction of the planetary gear reducer).

[0051] In this embodiment, the adjustment structure includes a key groove 302 formed on the driven gear 300, a main key 303 formed on the transmission shaft 310, and a secondary key 304. Specifically, as Figures 4-5 shown, the key groove 302 is formed on the inner wall of the transmission shaft hole of the driven gear 300 for assembling the transmission shaft 310; the main key 303 is formed on the circumferential surface of the transmission shaft 310 for passing through the key groove 302, and the width dimension of the main key 303 is smaller than the width dimension of the key groove 302. When the transmission shaft 310 is mounted on the driven gear 300, the key groove 302 defines an adjustment space 301 on both sides of the main key 303 for providing a space for the driven gear 300 and the transmission shaft 310 to rotate around the axis; the secondary key 304 is used to fill and seal the adjustment space 301.

[0052] During the assembly process, the coaxiality between the driven gear 300 and the transmission shaft 310 is limited by the aperture of the driven shaft hole 305 and the shaft diameter of the transmission shaft 310. At this time, two adjustment spaces 301 are defined on both sides of the keyway 302 and the main key 303. The adjustment space 301 can provide a space for the driven gear 300 and the transmission shaft 310 to rotate, so as to meet the requirement of rotating the driven gear 300 or the transmission shaft 310 during the assembly with the input coupling gear 210 or the output gear 400. When the driven gear 300 and the transmission shaft 310 are rotated, a higher-precision assembly requirement can be met, so that the tooth tips between two meshing gears are located at the tooth root positions of the other gear, thereby eliminating the misalignment in the background art and ensuring the assembly precision and reliability during the transmission process. After the assembly is completed, the auxiliary key is inserted into the adjustment space to fill the adjustment space, thereby eliminating the space and avoiding the shaking space to ensure the stability of the transmission power. It should be noted that the width dimension of the auxiliary key is determined. At the same time, the dimensions of the adjustment spaces on both sides of the main key are more determined. During the design process, according to the tooth profile parameters and the helix direction, the rotation angles of the driven gear and the driving gear during assembly can be determined. On this basis, a certain margin is set to form the dimension data of the adjustment space, and then the relevant data of the keyway, the main key and the auxiliary key are set according to the rotation angle and the reserved margin.

[0053] In this embodiment, to ensure the reliability of the adjustment structure, as Figure 5 shown, at least two symmetrically arranged keyways 302 are formed on the inner wall of the hole of the transmission shaft 310. Correspondingly, at least two symmetrically arranged main keys 303 are formed on the transmission shaft 310.

[0054] In this embodiment, the input shaft 200 and the output gear 400 are coaxially arranged. Specifically, as Figure 2 shown, an output shaft hole 411 penetrating the output gear 400 for key connection with the output shaft is formed on the end face of the output gear 400; a bearing mounting position is formed at the end of the output shaft hole facing the input shaft. At the same time, an installation portion 201 is further formed at the end of the input shaft 200 where the input coupling gear 210 is formed. The installation portion 201 is rotatably connected to the bearing mounting position through a bearing.

[0055] During the assembly process, one end of the input shaft 200 is rotatably connected to an end cover 120 of the housing 100. The mounting portion 201 of the input shaft 200 is rotatably connected to the bearing mounting position through a bearing, thereby forming a coaxial whole with the output shaft. It should be noted that during the power transmission process, two sets of reduction gear sets are symmetrically arranged on both sides of the input shaft 200, so that during the power transmission process, the generated radial force can be offset. Therefore, when the radial forces on the input shaft 200 and the output gear 400 are offset, the mutually rotatably connected input shaft 200 and output gear 400 can remain stable and reduce the efficiency loss.

[0056] During the process of the reducer transmitting power, the meshing gears engage at a high speed. Therefore, during operation, the reducer needs to be lubricated to ensure low loss, low noise, and long life during the meshing transmission process. In this embodiment, in order to achieve sufficient lubrication, as Figures 6-8 shown, the housing 100 includes a housing body 110 and two end covers 120. Among them, a containing space is provided inside the housing body 110, and the end covers 120 are hermetically installed at both ends of the housing body 110 to enclose the containing space; a confluence structure is also provided on the inner wall of the housing body 110 to collect the gear oil splashed to the top of the containing space due to the meshing movement and confluence it to the driving gear 320 located on the upper side.

[0057] Among them, multiple gears used to achieve speed reduction are assembled inside the containing space, and gear oil is contained inside the containing space. The filling amount of the gear oil is one-third to one-half of the containing space. At this time, the mutually engaged gears are lubricated by the splash lubrication method. In this embodiment, the passive gear 300 and the driving gear 320 located above can only be lubricated by the gear oil splashed out and splashing on the inner wall of the containing space. Since the splashed gear oil is chaotic and aimless, only a relatively large part fails to splash onto the driving gear 320 or the passive gear 300 located on the upper side. Relatively speaking, the amount of gear oil on the passive gear 300 and the driving gear 320 located on the upper side is less than that on the driving gear 320 and the passive gear 300 located on the lower side. In this embodiment, a confluence structure is provided on the inner wall of the housing body 110, which can collect the splashed gear oil and direct it onto the driving gear 320 on the upper side, thereby increasing the oil carrying capacity of the driving gear 320 and ensuring its lubrication performance.

[0058] Specifically, as Figures 6-8As shown, the current collecting structure includes a current collecting plate 130 formed on the inner wall of the housing 110. The current collecting plate 130 is located above the driving gear 320. One end of the current collecting plate 130 is formed on the inner wall of the housing 110, and the other end extends towards the driving gear 320. A plurality of current collecting grooves 131 are formed on the current collecting plate 130. By providing a current collecting plate 130, the splashed gear oil can be collected and guided through the current collecting grooves 131 to flow onto the driving gear 320 located above. It should be noted here that since the diameter of the driving gear 320 is relatively small, and at the same time, after deceleration, the rotational speed of the output gear 400 is also relatively low. Therefore, the amount of gear oil thrown out by centrifugal force due to the rotation of the output gear 400 is reduced, and thus the amount of gear oil splashed onto the driving gear 320 located above is also less. It should be noted that although a part of the output gear 400 is immersed in the gear oil during the transmission process and the gear oil can be smeared onto the driving gear 320 above through the meshing method, its main lubrication method still needs to be achieved through the splashing of gear oil. The splashed gear oil is collected by the current collecting plate 130, and the collected gear oil is guided through the current collecting grooves 131 to the driving gear 320 located above, thereby improving the lubrication effect of the driving gear 320.

[0059] In this embodiment, the current collecting plate 130 is inclined towards the direction away from the driven gear 300. By arranging the current collecting plate 130 in an inclined manner, the area of the current collecting plate 130 facing the gear oil can be increased, and thus more lubricating oil can be collected.

[0060] At the same time, a plurality of current collecting grooves 131 extend from the root of the current collecting plate 130 to the end, and a plurality of current collecting grooves 131 extend radially from the end of the current collecting plate 130 towards the root of the current collecting plate 130. Moreover, the width dimension of each current collecting groove 131 gradually decreases from the root to the end of the current collecting plate 130. By arranging the current collecting grooves 131 in a radial pattern, the gear oil flowing out along the current collecting grooves 131 can be converged into a single stream, thereby forming a continuously flowing oil line, so as to ensure that the gear oil can accurately flow onto the driving gear 320 above. At the same time, due to the structure of the current collecting groove 131 with a large width dimension at the root of the current collecting plate 130 and a small dimension at the end, during the process of the gear oil flowing downward along the current collecting groove 131, since the width dimension of the current collecting groove 131 gradually decreases, the gear oil in the current collecting groove 131 can be gradually converged into a stream, and thus can continuously flow out along the current collecting groove 131 and fall onto the driving gear 320 above in a linear manner. It should be noted that the way of falling onto the driving gear 320 above in a continuous linear manner is more stable and continuous in lubricating the driving gear 320 compared to the way of the gear oil dripping. The dripping method has a certain interval time and cannot continuously inject gear oil to lubricate the gears during transmission.

[0061] The above are only the preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Although the present invention is disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content to equivalent embodiments of equivalent changes, but as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A coaxial two-stage transmission reduction mechanism for a connecting shaft with an adjustment key for easy installation, comprising a box body, characterized in that, Inside the box body are assembled: An input shaft, one end of which is rotatably connected to the box body, and an input coupling gear is provided at the end of the input shaft inside the box body; An output shaft, which is rotatably connected to the other side of the box body opposite to the input shaft and is coaxially arranged with the input shaft. An output gear is provided at the end of the output shaft inside the box body, and a bearing mounting position for rotatably connecting the end of the input shaft therein is formed on the end face of the output gear facing the input shaft; Two driven gears, which are arranged symmetrically along the input shaft and are both meshed with the input coupling gear; Two drive shafts, which are respectively corresponding to the driven gears, and both ends of which are rotatably connected to the inner wall of the box body. One end of the drive shaft is provided with a driving gear coaxial with the driven gear, and the two driving gears are simultaneously meshed with the output gear to drive the output shaft to output power; the other end of the drive shaft is key-connected to the driven gear, and an adjustment structure is provided at the connection position between the drive shaft and the driven gear. The adjustment structure enables the driven gear and the drive shaft to have an adjustment space for rotating along the axis during the assembly process, and the adjustment space is filled and sealed after the assembly is completed.

2. The coaxial two-stage transmission reduction mechanism of a connecting shaft with an adjustment key for easy installation according to claim 1, characterized in that The adjustment structure includes: A keyway, which is formed on the inner wall of the drive shaft hole of the driven gear for assembling the drive shaft; A main key, which is formed on the circumferential surface of the drive shaft and is used to pass through the keyway. The width dimension of the main key is smaller than the width dimension of the keyway. When the drive shaft is installed on the driven gear, the keyway defines the adjustment space on both sides of the main key to provide a space for the driven gear and the drive shaft to rotate around the axis; A secondary key, which is used to fill and seal the adjustment space.

3. The coaxial two-stage transmission reduction mechanism of a connection shaft with an adjustment key for easy installation according to claim 2, characterized in that, There are at least two symmetrically arranged keyways formed on the inner wall of the drive shaft hole, and correspondingly, there are at least two symmetrically arranged main keys formed on the drive shaft.

4. A coaxial two-stage transmission reduction mechanism for a connecting shaft with an adjustment key for easy installation according to claim 1, characterized in that, The output gear is formed with an output shaft hole that penetrates the output gear for key-connecting with the output shaft, and the bearing mounting position is formed at the end of the output shaft hole facing the input shaft.

5. A coaxial two-stage transmission reduction mechanism for a connecting shaft with an adjustment key for easy installation according to claim 1, characterized in that, The box body includes: A housing, inside which there is a containing space; End covers, which are hermetically installed at both ends of the housing to seal the containing space; A confluence structure is further provided on the inner wall of the housing to collect the gear oil splashed to the top of the containing space due to meshing movement and confluence it to the driving gear located on the upper side.

6. The coaxial two-stage transmission reduction mechanism of a connecting shaft with an adjustment key for easy installation according to claim 5, characterized in that, The confluence structure includes a confluence plate formed on the inner wall of the housing. The confluence plate is located above the driving gear, one end of which is formed on the inner wall of the housing, and the other end extends towards the direction of the driving gear. A plurality of confluence grooves are formed on the confluence plate.

7. A coaxial two-stage transmission reduction mechanism for a connecting shaft with an adjustment key for easy installation according to claim 6, characterized in that, The confluence plate is inclined towards the direction away from the driven gear.

8. A coaxial two-stage transmission reduction mechanism for a connecting shaft with an adjustment key for easy installation, as described in claim 7, characterized in that A plurality of the busbars extend from the root to the end of the busbar plate, and a plurality of the busbars extend radially from the end of the busbar plate toward the root of the busbar plate.

9. The coaxial two-stage transmission reduction mechanism with an adjustment key for easy installation according to claim 8, characterized in that, The width dimension of each of the busbars gradually decreases from the root to the end of the busbar plate.

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