A coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a shaft

Abstract

A kind of adjusting key has the installation of two-stage transmission speed reduction mechanism of coaxial connection shaft, including a box, the box is equipped with: input shaft, the end of the input shaft in the box is provided with input connecting shaft gear;Passive gear, the passive gear is set to be symmetrical two along the input shaft, and is engaged with the input connecting shaft gear;Transmission shaft, it is set to correspond to two passive gears respectively, one end of the transmission shaft is provided with driving gear coaxial with the passive gear, and the transmission shaft is provided with adjusting structure at the connecting position with the passive gear;Output gear, the output gear is rotatably arranged in the box, and is engaged with two driving gears simultaneously.In the passive gear and transmission shaft between adjusting structure, it can define an adjustment space between the passive gear and transmission shaft during assembly, so that the passive gear and input connecting shaft gear complete reliable assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of speed reducer, in particular to a two-stage speed reducer structure with adjusting key groove for facilitating assembly. BACKGROUND

[0002] In the coaxial speed reducer, the planetary gear reducer is usually adopted, and the axial space of the planetary gear is relatively large, and the planetary carrier, the planetary gear and the sun gear need to be arranged in structure, so that the planetary gear reducer is relatively complex in structure. At present, there is a design scheme of two-stage speed reducer structure on the market, which is provided with passive gears on both sides of the input gear in a symmetrical manner, so as to offset the radial force through the cooperation of the two passive gears, and to realize the functions of speed reduction, torque increase and power transmission.

[0003] In 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 coaxial primary passive gear of the two-axis driving gear can be accurately meshed through the free rotation of the input gear under the condition of flat key locking. However, after a group of primary passive gears and coaxial two-axis driving gears are meshed with the input gear and the output gear, the circumferential position of the input gear and the output gear is locked. When another group of two-axis driving gears and the primary passive gears circumferentially locked therewith are installed, it is impossible to ensure that the primary passive gears and the input gears and the two-axis driving gears and the output gears are exactly tooth tip-tooth root. This misalignment is difficult to avoid, especially in the speed reducer, where most gears are helical gears. Therefore, in the case of fixing one gear and assembling another gear, the another gear needs to be rotated around the axis during assembly to achieve precise assembly. Therefore, the above misalignment is difficult to avoid, and can only be compensated by increasing the force for assembling the gears during assembly, but only the misalignment can be reduced, not eliminated.

[0004] Therefore, in order to overcome this defect, a two-stage speed reducer structure with adjusting key groove for facilitating assembly is designed to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a two-stage speed reducer structure with adjusting key groove for facilitating assembly to solve the above technical problems. The present application adopts the following technical scheme:

[0006] A two-stage transmission speed reducer mechanism with adjusting key for facilitating installation of coaxial shafts, comprising a box body, the box body is internally assembled with:

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

[0008] 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, and an output gear is arranged at the end of the output shaft inside the box body, and a bearing mounting position is formed on the end face of the output gear towards the end of the input shaft for rotatably connecting the end of the input shaft therein;

[0009] a driven gear, which is arranged symmetrically along the input shaft, and is in mesh with the input shaft gear;

[0010] a transmission shaft, which is arranged corresponding to the driven gear, and is rotatably connected to the inner wall of the box body at both ends, and a driving gear is arranged at one end of the transmission shaft coaxially with the driven gear, and the two driving gears are in mesh with the output gear at the same time to drive the output shaft to output power; the other end of the transmission shaft is keyed with the driven gear, and an adjusting structure is arranged at the connection position of the transmission shaft and the driven gear, which allows the driven gear and the transmission shaft to have an adjusting space rotating along the axis during assembly, and the adjusting space is filled and closed after assembly is completed.

[0011] Further, the adjusting structure comprises:

[0012] a key groove, which is formed on the inner wall of the transmission shaft hole of the driven gear for assembling the transmission shaft;

[0013] a main key, which is formed on the circumferential surface of the transmission shaft, and is arranged in the key groove, and the width of the main key is smaller than the width of the key groove, and the key groove defines the adjusting space on both sides of the main key to provide the space for the driven gear and the transmission shaft to rotate along the axis;

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

[0015] Further, the key groove formed on the inner wall of the transmission shaft hole is arranged with at least two symmetrically, and correspondingly, the main key formed on the transmission shaft is arranged with at least two symmetrically.

[0016] Further, the output gear is formed with an output shaft hole penetrating the output gear for keying with the output shaft, and the bearing mounting position is formed at the end of the output shaft hole towards the input shaft.

[0017] Further, the box body comprises:

[0018] A casing, which is internally provided with a containing space,

[0019] End covers, which are sealingly arranged at both ends of the casing and close the containing space;

[0020] The inner wall of the casing is further provided with a flow collecting structure, which is used to collect the gear oil splashed to the top of the containing space by the meshing movement and flow to the driving gear on the upper side.

[0021] Further, the flow collecting structure comprises a flow collecting plate shaped on the inner wall of the casing, which is located on the upper side of the driving gear, one end of which is shaped on the inner wall of the casing and the other end extends towards the driving gear, and a plurality of flow collecting grooves are shaped on the flow collecting plate.

[0022] Further, the flow collecting plate is obliquely arranged away from the driven gear.

[0023] Further, the plurality of flow collecting grooves extend from the root to the end of the flow collecting plate, and the plurality of flow collecting grooves extend radially from the end of the flow collecting plate towards the root of the flow collecting plate.

[0024] Further, the width of each flow collecting groove gradually decreases from the root to the end of the flow collecting plate.

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

[0026] The coaxial two-stage transmission speed reduction mechanism with the adjusting key convenient to install provided by the embodiment of the application comprises a driving motor, an input shaft, an input shaft gear, two passive gears, a transmission shaft, two active gears and an output gear, and the input shaft is in transmission connection with the driving motor, the input shaft gear is formed on the end of the input shaft in the box body, the two passive gears are symmetrically arranged on the two sides of the input shaft gear and are in meshing connection with the input shaft gear, the transmission shaft is in key connection with the two passive gears, the two active gears are symmetrically arranged on the two sides of the output gear and are in meshing connection with the output gear, and the input shaft gear, the two passive gears, the transmission shaft and the two active gears constitute a speed reduction gear set.

[0027] In the process of power transmission, the input shaft is in transmission connection with the driving motor, so that the power of the driving motor is input to the speed reducer, and it can be known that a section of the input shaft is connected to the box body through gear rotation, and the input shaft gear is formed on the end in the box body, the two passive gears are symmetrically arranged on the two sides of the input shaft gear and are in meshing connection with the input shaft gear, at the same time, the two active gears are symmetrically arranged on the two sides of the output gear and are in meshing connection with the output gear, and then in the process of power transmission of the input shaft rotation, the input shaft gear and the two passive gears are in meshing connection to realize the function of speed reduction and torque increase, and in this process, the two groups of speed reduction gear sets composed of the passive gears, the transmission shaft and the active gears are symmetrically arranged on the two sides of the input shaft gear and the output gear, so as to offset the radial force borne by the bearing, so that the bearing load is smaller, the efficiency loss is reduced, and the power output efficiency is ensured.

[0028] Compared with the prior art, the coaxial two-stage transmission speed reduction mechanism has the following advantages:

[0029] 1. In the secondary speed reduction of the present application, power is transmitted to two passive gears through an input shaft gear, so that the tooth surfaces on both sides of the input shaft gear are simultaneously engaged with the passive gears. In the case of the same modulus and rotational speed, the power transmitted is twice as much as that of a conventional one-to-one gear pair, and smaller modulus gears can be used to transmit greater torque, and the stability is improved, the noise is reduced, and the efficiency is improved.

[0030] 2. The present application uses two passive gears to clamp an input shaft gear, so that the radial force that cannot be avoided in gear transmission is completely offset, reducing friction, temperature rise and noise, and improving transmission efficiency and reliability.

[0031] 3. The output gear is clamped and driven by two driving gears, which also allows small modulus gears to output twice the torque, and also completely offsets the radial force that cannot be avoided in gear transmission, reducing friction, temperature rise and noise, and improving transmission efficiency and reliability.

[0032] 4. The present application can realize coaxial transmission, which has four advantages over the coaxial transmission of planetary reducers: ① Fewer parts, more compact structure, lower manufacturing cost. ② The maximum speed reduction and torque increase of a single stage of planetary reducer should not exceed 5 times, while the speed reduction and torque increase of a single stage of the present application can be 8 times. ③ In the case of a requirement for speed reduction and torque increase of more than 10 times, a planetary reducer requires two-stage reduction, resulting in a ratio of the axial length to the diameter of the reducer of about 1:1, while the axial length of the reducer of the present application is only about 30% of the radial size in the case of the same two-stage reduction and the same reduction ratio. In the case of limited axial size of the reducer, the two-stage reduction of the present application is shorter than the axial size of the one-stage reduction of the planetary reducer, and has the advantage of smaller axial size. ④ In the planetary reducer, the support driven by the planetary gear outputs power, but the end of the support where the planetary gear is installed is open, resulting in insufficient structural rigidity, which is an important source of efficiency loss of this type of reducer. In the reducer of the present application, all transmission parts are firmly fixed in position by bearings, and there is no single-sided opening, which greatly improves the transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0035] Figure 3 is an exploded structural schematic diagram of the passive gear and the transmission shaft in the present application.

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

[0037] Figure 5 is Figure 4 is a sectional view in A-A direction.

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

[0039] Figure 7 is Figure 6 is a sectional view in B-B direction.

[0040] Figure 8 is a structural schematic view of the casing in the present application.

[0041] In the figure: 100 - box; 200 - input shaft; 210 - input shaft gear; 300 - driven gear; 310 - transmission shaft; 320 - driving gear; 301 - adjustment space; 400 - output gear; 302 - key groove; 303 - main key; 304 - secondary key; 305 - transmission shaft hole; 110 - casing; 120 - end cover; 130 - bus plate; 131 - bus groove; 411 - output shaft hole; 201 - mounting portion. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of those skilled in the art, the present application is further described below in conjunction with the embodiments and the accompanying drawings. The content mentioned in the embodiments is not a limitation of the present application. The present application is described in detail below in conjunction with the accompanying drawings.

[0043] The application provides a two-stage speed reducer structure with an adjusting key groove 302 for facilitating assembly, which comprises an input shaft 200 for receiving power from a motor, an input connecting gear 210 formed on one end of the input shaft 200 in a box 100, an output shaft (not shown in the figure) coaxial with the input shaft and arranged in the box, and rotatably connected to another side of the box at one end, and an output gear arranged at one end of the output shaft in the box, wherein the end face of the output gear facing the end face of the input shaft is provided with a bearing mounting position for rotatably connecting the input shaft at one end of the box, so that the input shaft can be rotatably connected to the end face of the output gear, and the input shaft and the output shaft are connected to form a continuous shaft structure which can rotate at different speeds, respectively, two driven gears 300 are arranged on both sides of the input connecting gear 210 and are in mesh with the input connecting gear 210, and a driving shaft 310 is coaxially connected to one end of the driven gear 300 and is provided with a driving gear 320 at one end, two driving gears 320 are provided with an output gear 400 in mesh with each other, for driving the output shaft to output power, so as to transmit power after speed reduction and torque increase.At this time, the passive gear 300, the transmission shaft 310 and the driving gear 320 located at the same side form a set of reduction gear groups, at this time, the adjusting structure is arranged between the passive gear 300 and the transmission shaft 310, an adjusting space 301 can be defined between the passive gear 300 and the transmission shaft during assembly, so that the passive gear 300 and the transmission shaft 310 can rotate around the axis; during assembly, after the set of reduction gear groups and the output gear 400 and the input shaft gear 210 are assembled, at this time, the circumferential position of the output gear 400 and the input shaft gear 210 is locked, 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 difficult to move, at this time, during the assembly of the other set of reduction gear groups and the output gear 400 and the input shaft gear 210 whose circumferential position is locked, the passive gear 300 and the transmission shaft 310 can rotate through the adjusting structure, and then the passive gear 300 or the transmission shaft 310 (the end of the transmission shaft 310 is formed with the driving gear 320, and rotating the transmission shaft 310 can drive the driving shaft to rotate) can be rotated to reliably assemble the passive gear 300 and the input shaft gear 210, that is, the tooth tip part of the passive gear 300 can be deeply inserted into the tooth root part of the input shaft gear 210, and the same, the driving gear 320 can also be reliably assembled with the output gear 400, after assembly, the adjusting space 301 of the adjusting structure is supplemented, so as to eliminate the rotating space, accurate power transmission can be realized, through the adjusting structure, the gears of each set of reduction gear groups can continue to accurately mesh during the assembly of the reduction machine, and the misalignment of the gears is eliminated, that is, the tooth tip and the tooth root of each set of meshing gears can be corresponded, so as to reliably transmit power between the meshing gears.

[0044] Specifically, as shown in Figures 1-5 The application provides a two-stage reduction reduction machine structure with an adjusting key groove 302 for easy assembly, which comprises a box body 100, an input shaft 200, an output shaft (not shown in the figure), a passive gear 300, a transmission shaft 310 and an output gear 400 are assembled in the box body 100,

[0045] The input shaft is rotatably connected to the box body 100 at one end, and the end of the input shaft 200 located in the box body 100 is provided with an input shaft gear 210; the output shaft is rotatably connected to the other side of the box body corresponding to the input shaft, and is coaxially arranged with the input shaft, and the part of the output shaft located in the box body is provided with an output gear, and a bearing mounting position for rotatably connecting the end of the input shaft in it is arranged on the end face of the output gear facing the input shaft;

[0046] The passive gear 300 is arranged symmetrically along the input shaft 200, and is in mesh with the input shaft gear 210; the transmission shaft is arranged correspondingly to the passive gear 300, and the two ends of the transmission shaft are rotatably connected to the inner wall of the box body; the transmission shaft 310 is provided with a driving gear 320 coaxial with the passive gear 300 at one end, and the two driving gears are arranged on the two sides of the output gear and are in mesh with the output gear, for driving the output shaft to output power; the other end of the transmission shaft is in key connection with the passive gear 300, and the connection position of the transmission shaft 310 and the passive gear 300 is provided with an adjusting structure, which provides an adjustment space 301 for the rotation of the passive gear 300 and the transmission shaft 310 during assembly, and the adjustment space 301 is filled and closed after assembly is completed; as can be known, the diameters of the passive gear 300 and the driving gear 320 are one large and one small, so that the purpose of two-stage speed reduction can be achieved.

[0047] During assembly, the passive gear 300, the transmission shaft 310 and the driving gear 320 on the same side form a set of speed reduction gear sets, and two sets of speed reduction gear sets simultaneously complete speed reduction and power transmission; first, the assembly of one set of speed reduction gear sets, the input shaft gear 210 and the output gear 400 is completed; since the assembly of the passive gear 300, the driving gear 320, the input shaft gear 210 and the output gear 400 on one side is completed, there is a moving assembly space and a rotating degree of freedom between each component, so that the assembly on one side can be easily completed and can be accurately assembled, so that the tooth tips and tooth roots of the two meshing gears correspond to each other to ensure the reliability during meshing transmission; at this time, since the input shaft gear 210 and the output gear 400 are connected in mesh by one set of speed reduction gear sets, the circumferential positions of the input shaft gear 210 and the output gear 400 have been locked, and the four gears have formed an accurate gear meshing relationship; as long as the input gear rotates, the other three gears will follow linearly; during assembly of the other set of passive gear 300, transmission shaft 310 and driving gear 320, the passive gear 300 and the transmission shaft 310 are in key connection and provided with an adjusting structure; the adjusting structure can make the transmission shaft 310 and the passive gear 300 connected by the key connection have a space for rotation; during assembly with the output gear 400 and the input shaft gear 210, the transmission shaft 310 or the passive gear 300 can be rotated, so that accurate assembly of the speed reduction gear set, the output gear 400 and the input shaft gear 210 can be completed, the tooth tips and tooth roots of the two meshing gears correspond to each other, and the reliability during transmission is ensured.

[0048] In the process of power transmission, the input shaft 200 is in transmission connection with the driving motor, so that the power of the driving motor is input to the speed reducer. It can be known that one end of the input shaft 200 is rotatably connected to the box body 100 through a bearing, and an input shaft gear 210 is formed on the end portion located inside the box body 100. Two driven gears 300 are symmetrically located on both sides of the input shaft gear 210 and are in meshing connection with the input shaft gear 210. Meanwhile, two driving gears 320 are symmetrically located on both sides of the output gear 400 and are in meshing connection with the output gear 400. Thus, in the process of rotation of the input shaft 200 for power transmission, the input shaft gear 210 and the two driven gears 300 are in meshing connection, so as to realize the function of speed reduction and torque increase. In this process, the two groups of speed reduction gear sets composed of the driven gears 300, the transmission shafts 310 and the driving gears 320 are symmetrically arranged on both sides of the input shaft gear 210 and the output gear 400, so as to offset the radial force borne by the bearings, so that the bearing load is smaller, the efficiency loss is reduced, and the power output efficiency is ensured. Meanwhile, in the process of power transmission, the input shaft and the output shaft are coaxially arranged, and the end portion of the input shaft is rotatably connected to the bearing mounting position of the output gear, so that the input shaft and the output shaft form a continuous shaft structure which can rotate at different speeds. The bearing mounting position at the end portion of the output gear can not only serve as the positioning support of the output shaft, but also serve as the positioning support of the input shaft, so that the input shaft and the output shaft can rotate at different speeds in the condition of complete concentricity, so as to achieve the purpose of speed reduction and torque increase. Meanwhile, the coaxial arrangement of the input shaft and the output shaft and the formation of the continuous shaft structure which can rotate at different speeds can achieve higher speed reduction efficiency in the process of coaxial power transmission compared with the coaxial planetary gear speed reducer. It is worth noting that in the process of power transmission, the two groups of speed reduction gear sets are symmetrically arranged on both sides of the input shaft 200, so that the radial force generated in the process of power transmission can be offset. Therefore, in the case that the radial force of the input shaft 200 and the output gear 400 is offset, the input shaft 200 and the output gear 400 which are in rotational connection can remain stable and reduce the efficiency loss.

[0049] In the process of transmission, the input shaft gear on the input shaft is in meshing connection with two driven gears on the radial two sides. Since the number of teeth of the driven gear is N times that of the input shaft gear, a first-stage speed reduction is formed. The advantages of this structure are: ① Since the driven gears on the radial two sides of the input shaft gear clamp it, the radial force generated by the input shaft gear during operation is completely offset, so that friction is reduced, temperature rise is lowered, and reliability is improved. ② The input shaft gear only outputs power through the radial single side under normal circumstances, but outputs power through both sides under this structure, so that the output power and torque of the gear with the same modulus are increased by 1 times. Since the stability is better, the actual output power and torque are improved by more than 1 times.

[0050] Two passive gears are respectively installed on the transmission shaft, and are locked through the key groove and key of the passive gear and the transmission shaft, and power is transmitted to the driving gear coaxial with the transmission shaft, and the driving gear is engaged with the output gear from both sides of the output gear, and the radial force of the output gear is also offset, and the power and torque output by the modulus gear are also more than twice the effect of the conventional single gear engagement structure, and two-stage reduction can be achieved in a very short axial size (only equivalent to the axial length of the first-stage reduction of the planetary gear reducer).

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

[0052] In the process of assembling, the passive gear 300 and the transmission shaft 310 are limited by the hole diameter of the passive shaft hole 305 and the shaft diameter of the transmission shaft 310, so as to realize the coaxiality. At this time, the two sides of the key groove 302 and the main key 303 define two adjustment spaces 301, which can provide space for the rotation of the passive gear 300 and the transmission shaft 310, so as to meet the requirement of rotating the passive gear 300 or the transmission shaft 310 in the process of assembling with the input shaft gear 210 or the output gear 400. In the case of rotating the passive gear 300 and the transmission shaft 310, the more precise assembly requirement can be met, so that the tooth tip between the two meshing gears is located at the tooth root position of the other gear, thereby eliminating the misalignment in the background art, ensuring the assembly precision and the reliability in the transmission process. After completing the assembly, the secondary key is embedded into the adjustment space to fill the adjustment space, thereby eliminating the space and avoiding the shaking space, and ensuring the stability of the transmission power. It is worth noting that the width of the secondary key is determined, and at the same time, the size of the adjustment space on both sides of the main key is more determined. In the process of designing, the angle of rotation of the passive gear and the driving gear during assembly can be determined according to the parameters of the tooth profile and the rotation direction. On this basis, a certain allowance is set, so as to constitute the size data of the adjustment space, and further set the related data of the key groove, the main key and the secondary key according to the rotation angle and the reserved allowance.

[0053] In the embodiment, in order to ensure the reliability of the adjustment structure, as shown in Figure 5 The key groove 302 formed on the inner wall of the transmission shaft hole 310 is provided with at least two symmetrical ones, and correspondingly, the main key 303 formed on the transmission shaft 310 is provided with at least two symmetrical ones.

[0054] In the embodiment, the input shaft 200 and the output gear 400 are coaxially arranged. Specifically, as shown in Figure 2 The end surface of the output gear 400 is formed with an output shaft hole 411 penetrating the output gear 400 and used for connecting with the output shaft key; the bearing mounting position is formed on the end of the output shaft hole facing the input shaft, and the end of the input shaft 200 formed with the input shaft gear 210 is also formed with a mounting portion 201, which is connected to the bearing mounting position through the bearing rotation.

[0055] In the process of assembling, one end of the input shaft 200 is rotatably connected to one end cover 120 of the box body 100, and the mounting portion 201 of the input shaft 200 is rotatably connected to the bearing mounting position through a bearing, so as to form a coaxial whole with the output shaft. It is worth noting that in the process of power transmission, the two groups of speed reduction gear sets are symmetrically arranged on both sides of the input shaft 200, so that the radial force generated during power transmission can be offset. Therefore, the input shaft 200 and the output gear 400 are rotatably connected, and the radial force between the input shaft 200 and the output gear 400 is offset, so that the input shaft 200 and the output gear 400 can be kept stable and the efficiency loss is reduced.

[0056] In the process of power transmission of the speed reducer, high-speed meshing occurs between the gears that mesh with each other. Therefore, in the process of operation, the speed reducer needs to increase lubrication to ensure that the meshing transmission process has the performance of small loss, small noise and long service life. In the embodiment, in order to be able to fully lubricate, as shown in Figures 6-8 The box body 100 includes a casing 110 and two end covers 120. The casing 110 is internally provided with a containing space, and the end covers 120 are sealingly arranged at both ends of the casing 110 and are closed by the containing space. A flow collecting structure is further arranged on the inner wall of the casing 110, which is used to collect the gear oil splashed to the top of the containing space by meshing movement and flow to the driving gear 320 on the upper side.

[0057] The gears for realizing speed reduction are assembled in the containing space, and the containing space is filled with gear oil. The filling amount of the gear oil is one-third to one-half of the containing space. At this time, the gears combined with each other are lubricated by splashing lubrication. In the embodiment, the driven gear 300 and the driving gear 320 on the upper side can only be lubricated by the gear oil splashed out and splashed on the inner wall of the containing space. Since the splashed gear oil is chaotic and has no purpose, only a large part fails to splash to the driving gear 320 or the driven gear 300 on the upper side. Relatively, the amount of gear oil of the driven gear 300 and the driving gear 320 on the upper side is less than that of the driving gear 320 and the driven gear 300 on the lower side. In the embodiment, a flow collecting structure is arranged on the inner wall of the casing 110, which can collect the splashed gear oil and flow to the driving gear 320 on the upper side, thereby increasing the oil carrying capacity of the driving gear 320 and ensuring the lubrication performance.

[0058] Specifically, as shown in Figures 6-8As shown, the current collecting structure comprises a current collecting plate 130 formed on the inner wall of the casing 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 casing 110, the other end extends towards the driving gear 320, and a plurality of current collecting grooves 131 are formed on the current collecting plate 130. By arranging a current collecting plate 130, the splashed gear oil can be collected and guided to the driving gear 320 on the upper side through the current collecting grooves 131. It is worth noting that, since the diameter of the driving gear 320 is small, and the output gear 400 rotates at a low speed after being decelerated, the amount of gear oil splashed by the centrifugal force of the output gear 400 is reduced, and thus the amount of gear oil splashed on the driving gear 320 on the upper side is also reduced. It is worth noting that, although a part of the output gear 400 is immersed in the gear oil during transmission, the gear oil can be applied to the driving gear 320 on the upper side through the meshing of the gears, but the main lubrication mode is still achieved by splashing of the gear oil. The splashed gear oil is collected by the current collecting plate 130, and the collected gear oil is guided to the driving gear 320 on the upper side through the current collecting grooves 131, thereby improving the lubrication effect of the driving gear 320.

[0059] In the present embodiment, the current collecting plate 130 is arranged to be inclined away from the driven gear 300. By arranging the current collecting plate 130 to be inclined, the area of the current collecting plate 130 facing the gear oil can be increased, and more lubricating oil can be collected.

[0060] Meanwhile, 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. The width 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 manner, the gear oil flowing out of the current collecting grooves 131 can be gathered into a stream, thereby forming a continuous oil line, thereby ensuring that the gear oil can accurately flow onto the driving gear 320 on the upper side. Meanwhile, by arranging the current collecting grooves 131 to have a large width at the root of the current collecting plate 130 and a small width at the end, during the flow of the gear oil along the current collecting grooves 131 towards the bottom, the width of the current collecting grooves 131 gradually decreases, so that the gear oil in the current collecting grooves 131 can be gradually gathered into a stream, thereby continuously flowing out along the current collecting grooves 131 and falling onto the driving gear 320 on the upper side in a linear manner. It is worth noting that, compared with the dripping manner, the continuous linear falling manner on the driving gear 320 on the upper side is more stable and continuous for lubrication of the driving gear 320. The dripping manner has a certain interval time and cannot continuously lubricate the gears in transmission.

[0061] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical scheme of the present application, can make some changes or modifications to the equivalent embodiments disclosed above, as long as the changes or modifications do not depart from the technical scheme of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the present application are within the scope of the technical scheme of the present application.

Claims

1. A coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft, comprising a box, characterized in that, The box is equipped with: an input shaft, one end of which is rotatably connected to the box, and the end of the input shaft in the box is provided with an input shaft gear; an output shaft, which is rotatably connected to the other side of the box opposite to the input shaft, and is coaxially arranged with the input shaft, and the end of the output shaft in the box is provided with an output gear, and the end face of the output gear towards the input shaft is formed with a bearing mounting position for the end of the input shaft to be rotatably connected therein; a driven gear, which is provided as two symmetrical gears along the input shaft, and each is in meshing relationship with the input shaft gear; a transmission shaft, which is provided as two corresponding to the driven gears, and the two ends are rotatably connected to the inner wall of the box, one end of the transmission shaft is provided with a driving gear coaxial with the driven gear, and the two driving gears are simultaneously in meshing relationship with the output gear to drive the output shaft to output power; the other end of the transmission shaft is connected with the driven gear by a key, and the connection position of the transmission shaft and the driven gear is provided with an adjusting structure, which allows the driven gear and the transmission shaft to have an adjusting space for rotation along the axis during assembly, and the adjusting space is filled and closed after assembly is completed; The adjusting structure comprises: a key groove formed on the inner wall of the transmission shaft hole of the driven gear; a main key formed on the circumferential surface of the transmission shaft, which is arranged in the key groove, and the width of the main key is smaller than the width of the key groove, and when the transmission shaft is arranged on the driven gear, the key groove defines the adjusting space on both sides of the main key to provide the space for the driven gear and the transmission shaft to rotate around the axis; a secondary key for filling and closing the adjusting space.

2. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 1, characterized in that, The key groove formed on the inner wall of the transmission shaft hole is provided with at least two symmetrical keys, and correspondingly, the main key formed on the transmission shaft is provided with at least two symmetrical keys.

3. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 1, characterized in that, The output gear is formed with an output shaft hole penetrating the output gear for key connection with the output shaft, and the bearing mounting position is formed on the end of the output shaft hole towards the input shaft.

4. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 1, characterized in that, The box comprises: a casing, which is internally provided with a storage space, an end cover, which is sealingly arranged at both ends of the casing to close the storage space; the inner wall of the casing is further provided with a flow collecting structure for collecting the gear oil splashed to the top of the storage space by meshing movement and flowing to the upper driving gear.

5. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 4, characterized in that, The flow collecting structure comprises a flow collecting plate formed on the inner wall of the casing, which is located above the driving gear, one end of which is formed on the inner wall of the casing, and the other end extends towards the driving gear, and the flow collecting plate is formed with a plurality of flow grooves.

6. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 5, characterized in that, The flow collecting plate is inclined away from the driven gear.

7. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 6, characterized in that, A number of said runner channels extend from the root of the runner plate to the end thereof, and a number of said runner channels extend radially from the end of the runner plate towards the root of the runner plate.

8. The coaxial two-stage transmission speed reduction mechanism with an adjusting key for facilitating installation of a terminal shaft according to claim 7, characterized in that, The width dimension of each said runner channel decreases from the root to the end of the runner plate.

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