Transmission mechanism and gear motor

Abstract

The utility model discloses a transmission mechanism and a speed reduction motor, and relates to the technical field of transmission devices, the transmission mechanism comprises a casing and a coupling assembly, the casing is internally provided with a first cavity and a second cavity which are separated by a partition plate, and the partition plate is also provided with a through hole communicated with the first cavity and the second cavity. The coupling assembly is rotatably arranged in the through hole through the first supporting component, and the coupling assembly extends outwards to form an oil retainer which shields at least part of the first supporting component in the circumferential direction. The oil retainer can block grease flowing from the first cavity to the second cavity, so that the transmission mechanism is more reliable in grease sealing performance, and the problem that the grease flows into the power unit to cause faults and damage of mechanical or electrical parts of the gear motor is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of transmission device especially relates to a transmission mechanism and speed reducer motor. BACKGROUND

[0002] The electric wheelchair is formed through upgrading and reconstruction of power driving device, control device, battery and other components on the basis of the traditional manual wheelchair, and the overall movement of the electric wheelchair is realized through the power provided by the battery and the control device controlling the power driving device to drive the chair wheel to rotate.

[0003] One of the core technologies of the electric wheelchair is the driving device, and the driving device is connected with the chair wheel through the transmission mechanism (such as the speed reducer) to realize speed reduction and torque increase.

[0004] However, the flow direction of the oil in the transmission mechanism is irregular, and the oil is easily rolled into the power unit with the operation of the mechanical system, thereby entering the internal power unit to cause faults, abnormalities and even damage, etc. INVENTION CONTENTS

[0005] The purpose of the embodiment of the utility model is to provide a transmission mechanism and speed reducer motor, which can solve the above problems existing in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] In the first aspect, a transmission mechanism is provided, comprising:

[0008] A housing is formed with a hollow mounting cavity inside, and a partition plate is arranged in the mounting cavity, which divides the mounting cavity into a first cavity and a second cavity, and a through hole is further formed in the partition plate to communicate the first cavity and the second cavity;

[0009] A shaft coupling assembly is rotatably connected with the through hole through a first supporting part, wherein the shaft coupling assembly extends outward at one end close to the first cavity and has an oil blocking ring which blocks at least part of the first supporting part in the circumferential direction.

[0010] The transmission mechanism utilizes a split structure to set the power unit and the input component as two independent parts, after being connected through the shaft coupling assembly, the two parts can effectively reduce the assembly precision requirement of the transmission mechanism on the input component side, thereby reducing the manufacturing and assembly cost of the transmission mechanism, and further setting the oil baffle ring on the shaft coupling assembly, so that the oil baffle ring can block the oil flowing from the first cavity to the second cavity, and the sealing performance of the transmission mechanism to the oil is more reliable, avoiding the problem that the oil flows into the power unit and causes mechanical or electrical component failure and damage of the speed reducer.

[0011] As an optional implementation, the transmission mechanism further comprises:

[0012] a power unit, at least partially arranged in the second cavity;

[0013] an input component, at least partially arranged in the first cavity;

[0014] one end of the shaft coupling assembly is connected with the power unit, and the other end is connected with the input component.

[0015] As an optional implementation, the shaft coupling assembly comprises:

[0016] an adapter arranged at one end of the through hole close to the first cavity and connected with the input component, and the oil baffle ring is arranged in the adapter;

[0017] a flexible component arranged between the power unit and the adapter and connected with the power unit and the adapter respectively.

[0018] As an optional implementation, the shaft coupling assembly further comprises a transition connector, and the transition connector is arranged between the adapter and the flexible component;

[0019] one end of the adapter is provided with a first limiting groove, the flexible component is provided with a second limiting groove opposite to the first limiting groove, the transition connector is interference-fitted with the second limiting groove, and the adapter is inserted into the second limiting groove and interference-fitted with the transition connector through the first limiting groove.

[0020] As an optional implementation, the first supporting component comprises:

[0021] a first fixed part fixedly arranged on the hole wall of the through hole in the circumferential direction;

[0022] a first movable part rotatably arranged in the first fixed part and fixedly connected with the adapter, and a first rotation gap is formed between the first fixed part and the first movable part;

[0023] The oil blocking ring shields the first rotation gap near one end of the first cavity.

[0024] The first supporting component is arranged between the casing and the adapter through two relatively rotatable parts, which can improve the smoothness of the adapter during movement relative to the casing, make the transmission of the power unit and the input component more efficient, and ensure that the oil blocking ring shields the first rotation gap between the first fixed part and the first movable part to avoid the situation that the first supporting component causes the oil leakage probability to increase due to the above structure.

[0025] As an optional implementation, the first supporting component is arranged as a first bearing, the first fixed part is arranged as an outer ring of the first bearing, and the first movable part is arranged as an inner ring of the first bearing.

[0026] The first bearing is further provided with a first bearing cover on one side near the first cavity, and the oil blocking ring is shielded by the first bearing cover.

[0027] In the case where the first supporting component is arranged as a first bearing, the first bearing can block the first rotation gap by arranging a first bearing cover, so as to improve the anti-leakage performance of the first supporting component in cooperation with the first bearing cover.

[0028] As an optional implementation, the power unit is rotatably arranged in the through hole at least partially through a second supporting component.

[0029] The first supporting component and the second supporting component are arranged in the through hole in a spaced manner, so as to form an oil storage cavity between the first supporting component and the second supporting component.

[0030] By arranging the oil storage cavity in the through hole, the leaked oil from the first supporting component can be stored, which plays a certain buffering role, avoids the situation that the oil immediately enters the second cavity after leakage, and the oil storage cavity is formed in cooperation with the first supporting component and the second supporting component, which also ensures that the formation of the oil storage cavity has high structural compactness.

[0031] As an optional implementation, the power unit is rotatably arranged in the through hole at least partially through a second supporting component, and the second supporting component comprises:

[0032] A second fixed part is in interference fit with the hole wall of the through hole in the circumferential direction.

[0033] A second movable part is rotatably arranged in the second fixed part and in interference fit with the power unit.

[0034] The second fixed part and the second movable part are assembled with the hole wall of the through hole and the power unit by interference fit, which can effectively improve the anti-leakage performance of the second supporting part and improve the buffering and blocking effect of the oil storage cavity to a certain extent.

[0035] As an optional implementation, the second supporting part is a second bearing, the second fixed part is an outer ring of the second bearing, and the second movable part is an inner ring of the second bearing.

[0036] The second bearing is provided with a second bearing cover on both sides.

[0037] Similarly, in the case where the second supporting part is a second bearing, the second bearing can also improve the sealing performance of the internal gap by being provided with a second bearing cover, further reducing the possibility of oil and internal oil in the oil storage cavity seeping into the second cavity.

[0038] As an optional implementation, the adapter is provided with a counterbore on the side close to the first cavity, and one end of the input part is inserted into the counterbore.

[0039] The input part and the adapter are inserted and matched through the counterbore, which can effectively improve the assembly stability between them, avoid excessive movement gap between the input part and the adapter during transmission with the power unit, and make the transmission of the mechanical system more efficient and stable, and also to a certain extent, avoid the problem of carbon deposition between the input part and the adapter.

[0040] As an optional implementation, the inner wall of the through hole is provided with a limiting table protruding in the circumferential direction, and the side of the first supporting part away from the oil baffle ring abuts against the limiting table.

[0041] The first supporting part determines its installation position in the through hole through the limiting table, which can ensure that the first supporting part and the adapter maintain the correct relative position, further reducing the possibility of oil leakage of the first supporting part.

[0042] As an optional implementation, the input part has a first end and a second end, and the input part is fixedly connected to the adapter by the first end.

[0043] The second end of the input part is rotatably connected to the shell by the third supporting part.

[0044] The two ends of the input part are respectively supported by the adapter and the third supporting part, which can effectively improve the stability during operation and reduce the possibility of oil leakage due to excessive position shift of parts during operation of the transmission mechanism.

[0045] In a second aspect, a speed reduction motor is provided, comprising:

[0046] The transmission mechanism as claimed in the first aspect;

[0047] The power unit is fixedly installed in the second cavity through the fixing part, and the driving part of the power unit is connected with the shaft coupling assembly.

[0048] The input part of the transmission mechanism can be connected with the driving part of the power unit through the shaft coupling assembly, and the split structure is used to reduce the manufacturing and assembly cost of the transmission mechanism, and the centering cooperation of the power unit and the input part is compensated, so that the noise and vibration problems of the transmission mechanism are improved, the cooperation precision of the input part and other parts such as the first supporting part in the installation cavity is ensured, and the possibility of oil leakage is effectively reduced.

[0049] By providing the oil baffle ring on the shaft coupling assembly, the oil flowing from the first cavity to the second cavity is blocked, the sealing performance of the transmission mechanism for oil is more reliable, and the problem that the oil flows into the power unit to cause mechanical or electrical component failure and damage of the speed reduction motor is avoided. Moreover, in the application of the speed reduction motor, since the oil baffle ring blocks the oil in the first cavity, the driving part of the power unit in the second cavity also does not need to be further installed with an oil seal or a sealing ring, so that the power unit is not blocked, the output efficiency of the power unit is ensured, and the energy consumption of the speed reduction motor is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0050] The utility model will be further explained in detail below according to the drawings and examples.

[0051] Figure 1 The speed reduction motor cross-sectional view described in the utility model example is shown in the figure.

[0052] Figure 2 The Figure 1 The A part of the middle enlarged view is shown in the figure.

[0053] Figure 3 The shaft coupling assembly explosion view of the utility model is shown in the figure.

[0054] In the figure: 10, the shell; 11, the partition; 111, the through hole; 112, the limiting table; 12, the first cavity; 13, the second cavity; 14, the oil storage cavity; 20, the shaft coupling assembly; 21, the flexible part; 211, the second limiting groove; 22, the transition connecting piece; 30, the adapter; 31, the oil retaining ring; 32, the counterbore; 33, the first limiting groove; 40, the first supporting part; 41, the first fixed part; 42, the first movable part; 43, the first rotation gap; 44, the first bearing cover; 50, the second supporting part; 51, the second fixed part; 52, the second movable part; 53, the second rotation gap; 54, the second bearing cover; 60, the third supporting part; 70, the input part; 80, the output part; 90, the power unit; 91, the fixed part; 92, the driving part. DETAILED DESCRIPTION

[0055] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model embodiment is further described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0056] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0057] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0058] The electric wheelchair is an auxiliary moving device designed for people with difficulty in moving, which is upgraded and modified on the basis of the traditional manual wheelchair by adding power driving device (power unit), control device, battery and other components. The electric wheelchair is mainly moved by the power provided by the battery and the control device controlling the power driving device to drive the chair wheels to rotate.

[0059] One of the core technologies of the electric wheelchair is the driving device. The main function of the reducer is to convert the high-speed low-torque output of the driving device into low-speed high-torque to meet the driving requirements of the electric wheelchair. At present, various types of gear reducers have appeared on different electric wheelchairs, such as parallel shaft gear reducer, intersecting shaft gear reducer, planetary structure reducer, etc.

[0060] During the operation of any type of reducer, the relative movement between the components will generate friction, which will cause energy loss, component wear and temperature rise. Therefore, grease is usually added for lubrication in the reducer. As a lubricant, grease can significantly reduce the friction coefficient in the equipment, thereby reducing wear and heat generation, prolonging the service life of the reducer and improving the operating efficiency of the equipment, and to a certain extent, reducing the noise generated during operation.

[0061] In addition, grease can absorb and disperse the heat generated during the operation of the reducer, reduce the operating temperature of the equipment, and remove some impurities and dirt accumulated inside the reducer, ensuring the cleanliness of the equipment interior, thereby preventing corrosion and rust of the internal components of the reducer.

[0062] However, the flow direction of the grease in the reducer is irregular. This irregularity of flow may cause some areas inside the reducer to form high or low pressure areas during operation. This pressure difference will accelerate the flow of grease from high pressure areas to low pressure areas, especially in places where the seal is not tight or there are small gaps, grease is more likely to leak out of these areas. At the same time, irregular flow of grease may also cause the temperature of some areas inside the reducer to rise. After the temperature of the grease rises in some areas with rising temperature, the viscosity of the grease will decrease and the flowability will increase, so it is also more likely to occur in the reducer. Leakage. Of course, there are many possibilities for grease to cause irregular flow and leakage inside the reducer, such as the impact of irregular flow of grease on the seal, causing the seal to wear or damage, etc. This embodiment will not be described again.

[0063] In some cases, oil and fat will be gradually rolled into the power unit along the output end of the power unit due to the irregularity of its flow in the reducer, causing consequences such as failure, abnormality and even damage of the power unit, and reducing the reliability and durability of the product equipment. It may also pose a threat to the safety of the user and affect the user's experience. There are currently three main design schemes to prevent oil and fat from being rolled into the power unit due to the above reasons:

[0064] I. Directly use the sealing property of the bearing provided on the power unit to isolate the oil and fat. This isolation method has poor effect and short service life, and the risk of oil and fat leakage gradually increases with the running time of the reducer;

[0065] II. Increase the oil seal or sealing ring at the output end of the power unit. Although this method can achieve good oil prevention effect, the resistance at the output end of the power unit will also increase, thereby reducing the output efficiency of the power unit;

[0066] III. Directly apply sealing glue at the bearing hole of the output end of the power unit. However, this method cannot prevent oil and fat from seeping into the power unit from the bearing cover, and cannot actually solve the related problems.

[0067] Therefore, the present embodiment provides a transmission mechanism which can be applied to not only the above-mentioned mainstream gear reducer but also other types of reducers (such as worm reducer, harmonic reducer, etc.). The transmission mechanism uses a split design to improve the error problem caused by the related components in the transmission process, and to reduce the possibility of oil leakage in the transmission mechanism to a certain extent. Furthermore, an oil baffle is arranged inside the transmission mechanism to block the oil in the transmission mechanism, thereby solving the problem of mechanical and electrical failure of the transmission mechanism and the applied reducer motor in the use of electric wheelchair.

[0068] Please refer to the attached drawings Figure 1 The transmission mechanism mainly includes a machine shell 10. The machine shell 10 serves as the support base of the transmission mechanism and the applied reducer motor, and is used to ensure the stable operation of the entire transmission system. The machine shell 10 has a hollow installation cavity inside, and a partition plate 11 is arranged in the installation cavity to divide it into a first cavity 12 and a second cavity 13 located on both sides of the machine shell 10. In the specific scenario where the transmission mechanism is applied to the reducer motor, the first cavity 12 is used to provide corresponding installation space and position for the mechanical system (such as transmission shaft, reduction gear, etc.) in the transmission mechanism, and the second cavity 13 is used to provide corresponding installation space and position for the power unit 90 of the reducer motor, so that the transmission between the power unit 90 and the mechanical system can be performed through the machine shell 10, and the overall structure of the transmission mechanism is more compact and regular.

[0069] It can be understood that the first cavity 12 and the second cavity 13 provide a relatively closed environment for the entire transmission system, thereby preliminarily preventing external impurities, moisture, dust and the like from entering the inside of the casing 10, and avoiding the situation that oil in the transmission system leaks to the outside environment. In addition, the casing 10 also has a certain sound insulation and shock absorption effect, which can reduce the noise and vibration generated by the transmission system during operation, thereby improving the stability of the overall reduction motor in the application of the electric wheelchair, and improving the performance of the equipment product and the riding experience of the user.

[0070] In order to enable the casing 10 to meet the requirements of related performance, the casing 10 is generally made of materials with high strength and wear resistance, such as cast iron, cast steel or aluminum alloy, and the present embodiment does not make strict limitations and requirements thereon.

[0071] In the present example, the output component 80 is rotatably arranged in the first cavity 12, and the output component 80 at least partially penetrates the casing 10 from the outside of the first cavity 12 to provide a position for connecting the transmission mechanism with other component devices, so that the power output by the power unit 90 can be transmitted to the component devices connected thereto through the output component 80.

[0072] Further, the partition plate 11 is also provided with a through hole 111 communicating the first cavity 12 and the second cavity 13. In the case that the power unit 90 is arranged in the second cavity 13 of the casing 10, the through hole 111 is used to provide a corresponding space for the connection between the driving part 92 of the power unit 90 and the mechanical system of the transmission mechanism, so as to establish a transmission relationship between the power unit 90 and the above-mentioned output component 80, thereby realizing the functions of speed reduction and power output.

[0073] It can also be learned from the above that the output component 80 is part of the mechanical system of the transmission mechanism, and in order to ensure that the mechanical system of the transmission mechanism can smoothly transmit the power from the power unit 90, the transmission mechanism further comprises a shaft coupling assembly 20 which is rotatably arranged in the through hole 111 through the first supporting component 40 and connected with the hole wall of the through hole 111, so as to connect the driving part 92 of the power unit 90 with the mechanical system of the transmission mechanism. It should be explained that the shaft coupling assembly 20 can be a flexible coupling in an embodiment, which means that part of the coupling is flexible and deformable, and allows a certain amount of misalignment to occur between the two shafts when they are connected, that is, the coupling is deformable under dynamic conditions. There are many types of flexible couplings, including common rubber couplings (such as polygonal rubber couplings, rubber block couplings, etc.), diaphragm couplings, bellows couplings, and strong magnetic flexible couplings, etc. In the case where the shaft coupling assembly 20 connects the power unit 90 with the mechanical system of the transmission mechanism, the shaft coupling assembly 20 as a flexible coupling can realize the connection and buffering between the two mechanical components through the elastic elements (such as rubber, spring, diaphragm, bellows, etc.) inside it. When there is a speed difference, angular deviation or axial displacement between the driving part 92 of the power unit 90 and the mechanical system of the transmission mechanism (such as the input component 70 mentioned later), the shaft coupling assembly 20 can absorb these differences to make the transmission system more stable. At the same time, it can also effectively reduce the impact of vibration and impact caused by the above errors on the mechanical equipment, and improve the service life of the equipment.

[0074] It is worth mentioning that in order to ensure that the shaft coupling assembly 20 can rotatably transmit the power output by the power unit 90 in the through hole 111, and establish a matching relationship between the shaft coupling assembly 20 and the hole wall of the through hole 111, thereby improving the stability of the shaft coupling assembly 20, the shaft coupling assembly 20 and the hole wall of the through hole 111 can adopt, but not limited to, some common rotating matching relationships in the current mechanical field. Such as clearance fit, bearing fit, gear fit, etc.

[0075] It should be understood that since there is a gap relationship between the first supporting component 40 and the casing 10 (the through hole 111), and even between the adapter 30 and the first supporting component 40 due to machining errors and assembly errors, etc., grease may seep from the first cavity 12 to the second cavity 13 through the above gap. In some embodiments, the first supporting component 40 is composed of two components that can rotate relative to each other, one of which is fixedly connected with the hole wall of the through hole 111, and the other is connected with the shaft coupling assembly 20. The two components form a rotating, sliding or other form of connection, so that the shaft coupling assembly 20 can move in the through hole 111. Therefore, there will be a certain clearance between the two components, and there is a risk of grease leakage from the clearance.

[0076] In order to avoid the above problems, the shaft coupling assembly 20 extends outwardly with an oil blocking ring 31 which blocks at least part of the first supporting member 40 in the circumferential direction, so that the oil blocking ring 31 and the first supporting member 40 jointly block the through hole 111. The oil blocking ring 31 should block as much of the first supporting member 40 as possible to maximally prevent the oil from contacting the first supporting member 40, thereby avoiding the oil from leaking from the first cavity 12 to the second cavity 13 through the clearance of the first supporting member 40 itself and the assembly clearance between the shaft coupling assembly 20 and the first supporting member 40.

[0077] In combination with the input member 70 included in the mechanical system of the transmission mechanism, the input member 70 is arranged in the first cavity 12 and fixedly connected to one end of the shaft coupling assembly 20, and is used for transmission connection with the output member 80. It can be understood that in the mechanical system of the transmission mechanism, the input member 70 is the power inlet of the transmission mechanism, responsible for introducing the power of the power unit 90 into the inside of the transmission mechanism, while the output member 80 is the power outlet of the transmission mechanism, responsible for outputting the decelerated power to the required position. In order to facilitate the understanding of the scheme, the input member 70 and the output member 80 of the present embodiment can be arranged as an input shaft and an output shaft, and the input shaft and the output shaft are connected through a set of reduction gears, thereby achieving the effect of speed reduction and torque increase.

[0078] Specifically, in the application scenario of the transmission mechanism as a reduction motor, under the action of the power unit 90, the shaft coupling assembly 20 rotates to drive the input member 70 to move. In this process, the oil blocking ring 31 around the outer periphery of the adapter 30 also moves synchronously with the driving part 92 of the power unit 90, and uses the centrifugal force generated by rotation to throw the oil in the circumferential direction. In this way, not only the utilization rate of lubricating oil can be improved, but also an oil film barrier can be formed between the oil blocking ring 31 and the first supporting member 40. Even if the oil blocking ring 31 does not completely block the first supporting member 40 in order to ensure the rotation cooperation between the shaft coupling assembly 20 and the through hole 111 (there is still a certain gap between the hole wall and the through hole 111), the oil film formed by centrifugation can also block the oil before the first supporting member 40, effectively preventing the oil from leaking out, avoiding the problem that the oil flows into the power unit 90 and causes mechanical or electrical component failure and damage of the reduction motor, and maintaining the normal operation of the mechanical system. In addition, it can also reduce the oiling period and the frequency of maintenance.

[0079] Due to the relationship that the oil blocking ring 31 blocks the oil in the first cavity 12, the driving part 92 of the power unit 90 located in the second cavity 13 does not need to be further installed with an oil seal or a sealing ring, so as not to form resistance to the power unit 90. The output efficiency of the power unit 90 is guaranteed, and the energy consumption of the reduction motor is also reduced.

[0080] From the above, it can be seen that when the coupling assembly 20 is set as a flexible coupling, the coupling assembly will have a large compensation capacity, capable of compensating for the misalignment, axial displacement and angular displacement between the two shafts and effectively reducing vibration and noise, improving the running stability of the equipment. The utility model also utilizes the split structure, separates the input component 70 from the power unit 90, connects the input component 70 and the driving part 92 of the power unit 90 through the coupling assembly 20, thereby reducing the assembly precision requirement of the input component 70 in the mechanical system of the transmission mechanism, thereby realizing the reduction of the manufacturing and assembly cost of the transmission mechanism. In addition, the centering cooperation between the power unit 90 and the input component 70 is compensated by the coupling assembly 20, so that the cooperation precision of the input component 70 and other components such as the first supporting component 40 in the installation cavity is ensured, and the possibility of oil leakage is effectively reduced.

[0081] It is worth mentioning that due to the fact that the oil baffle ring 31 cannot completely shield the first supporting component 40, in some embodiments, the gap between the first supporting component 40 and the hole wall of the through hole 111 can also be filled by applying sealant, thereby forming a stable sealing structure between the two, and improving the sealing performance between the first supporting component 40 and the casing 10 in addition to blocking the oil by the oil baffle ring 31.

[0082] As shown in Figure 3 In the case of setting the coupling assembly 20 as a flexible coupling, in order to adapt the connection between the coupling assembly 20 and the mechanical system of the speed reducer, the transmission mechanism further comprises an adapter 30, which is arranged at one end of the through hole 111 close to the first cavity 12 and connected with the input component 70. The main function of the adapter 30 is to adapt to different specifications of the coupling assembly 20 and the mechanical system of the transmission mechanism, thereby playing a transition role, making the internal structure of the transmission mechanism more closely and stably cooperate. Moreover, in the actual assembly process, the adapter 30 can allow a certain axial and radial deviation and deflection, so that the presence of the adapter 30 also provides higher flexibility for the connection between the coupling assembly 20 and the mechanical system, to a certain extent, reduces the energy loss in the transmission process, and improves the transmission efficiency.

[0083] In an embodiment, the adapter 30 can be provided as a shaft sleeve, one end of the adapter 30 can be connected with the flexible component 21 in the coupling assembly 20 by different connection methods such as interference fit, key connection, etc., and the other end of the adapter 30 can form a fixed connection relationship with the input component 70 in the mechanical system to realize stable transmission between the coupling assembly 20 and the input component 70.

[0084] In order to enable the adapter 30 to stably transmit the power output by the power unit 90, the adapter 30 is rotatably arranged in the through hole 111 by a first supporting member 40, which is a member for supporting the adapter 30 in the through hole 111, and can be, but is not limited to, a bearing, a bushing or other forms of supporting structure. In actual application scenarios, the main function of the supporting member is to bear the radial and axial loads of the shaft, while allowing the adapter 30 to rotate in the through hole 111.

[0085] Further, the oil baffle ring 31 in the shaft coupling assembly 20 is specifically arranged on the outer circumferential portion of the adapter 30, so that when the adapter 30 is arranged on the side of the casing 10 close to the first cavity 12, the oil baffle ring 31 can be positioned to sufficiently shield the first supporting member 40.

[0086] From the above, it can be seen that the shaft coupling assembly 20 further comprises a flexible member 21, which is defined in this embodiment as a member having a certain elastic deformation capacity and being capable of providing a structural strength required for the shaft coupling assembly 20 to support. The flexible member 21 is arranged between the driving portion 92 of the power unit 90 and the adapter 30, and is connected to the driving portion 92 of the power unit 90 and the adapter 30, respectively, i.e., as a force transmission medium between the adapter 30 and the power unit 90. In the case that the flexible member 21 has a certain elastic deformation capacity, the flexible member 21 can compensate for the gap between the power unit 90 and the adapter 30 in terms of assembly error, etc., thereby improving the transmission accuracy therebetween.

[0087] And continuing to refer to the drawings Figure 3 The shaft coupling assembly 20 further comprises a transition connecting member 22 arranged between the adapter 30 and the flexible member 21, for limiting the relative freedom of the adapter 30 and the flexible member 21 in the rotation direction to a certain extent, so that they have a certain movement compensation gap in the rotation direction, and can realize transmission in the rotation direction.

[0088] Specifically, the adapter 30 has a first limiting groove 33 at one end, and the flexible component 21 has a second limiting groove 211 facing the opening of the first limiting groove 33. The transition connector 22 is inserted into the second limiting groove 211 to achieve an interference fit with the second limiting groove 211. The second limiting groove 211 also has a space for the adapter 30 to be inserted. The adapter 30 is inserted into the second limiting groove 211, and the part of the adapter 30 inserted into the second limiting groove 211 is located between the transition connector 22 and the groove wall of the second limiting groove 211. The adapter 30 is engaged with both sides of the transition connector 22 through the first limiting groove 33 to achieve an interference fit between the adapter 30 and the transition connector 22. As can be seen from the above, the flexible component 21 and the power unit 90 are also fitted together by a snap-fit ​​mechanism, so that a certain amount of movement compensation gap is reserved between them. When the flexible component 21 is driven to rotate by the drive part 92 of the power unit 90, the flexible component 21 can rotate along with it. At the same time, the transition connector 22 applies a circumferential rotational force to the adapter 30. During this force transmission process, the flexible component 21 can compensate for the assembly gap between the components through its physical characteristics, thereby making up for the coaxiality error between the power unit 90 and the adapter 30, and achieving the effect of balancing error compensation and synchronous transmission.

[0089] Please continue to refer to the appendix. Figures 1-2 As can be seen from the above embodiments, in some embodiments, the first support component 40 is composed of two mutually rotatable components. As a specific structural form of this embodiment, the first support component 40 specifically includes a first fixing member 41 and a first movable member 42. The first fixing member 41 is fixedly disposed on the wall of the through hole 111 along the circumferential direction. This arrangement forms an annular structure on the inner wall of the through hole 111, providing corresponding installation space for the first movable member 42. The first movable member 42 corresponds to the structure of the first fixing member 41, is rotatably disposed in the first fixing member 41 and is fixedly connected to the adapter 30. A first rotation gap 43 is formed between the first fixing member 41 and the first movable member 42 to ensure that the first movable member 42 can rotate smoothly in the first fixing member 41 without being subjected to excessive friction or resistance. At the same time, this gap also helps to prevent jamming or damage between components due to manufacturing tolerances or thermal expansion.

[0090] Therefore, it can be seen that the first rotation gap 43 formed between the first fixed member 41 and the first movable member 42 has a large risk of oil leakage. Therefore, the oil baffle ring 31 is set to block the end of the first rotation gap 43 near the first cavity 12, thereby isolating the leakage path between the first cavity 12 and the first rotation gap 43.

[0091] The above-mentioned arrangement can effectively improve the smoothness of the rotation of the adapter 30 in the through hole 111, thereby ensuring the efficiency of the transmission process between the power unit 90 and the input component 70, while also preventing grease from seeping from the first cavity 12 to the second cavity 13 through the first rotation gap 43.

[0092] Following the above embodiments, in one embodiment, the first support member 40 is configured as a first bearing, wherein the first fixed member 41 is configured as the outer ring of the first bearing, and the first movable member 42 is configured as the inner ring of the first bearing. In a further embodiment, the friction between the outer and inner rings of the first bearing can be further reduced by setting rolling elements. However, such a design will be accompanied by an increase in the size of the first rotation gap 43. Although there is an oil baffle ring 31 blocking the first bearing on the side near the first cavity 12, in order to ensure that grease does not seep into the second cavity through the first rotation gap 43 as much as possible, this embodiment further provides a first bearing cover 44 on the side of the first bearing near the first cavity 12. The first bearing cover 44 is specifically installed between the outer ring (first fixed member 41) and the inner ring (first movable member 42) of the first bearing to further block the first cavity 12 from the first rotation gap 43. Correspondingly, the oil baffle ring 31 is also shielded on the side of the first bearing cover 44 away from the second cavity 13 according to the above configuration, thereby playing a double-layer oil baffle role.

[0093] Understandably, the bearing cap, also known as the oil cap in mechanical design, plays a crucial role in sealing the bearing grease and preventing external dust, oil, and other liquids from entering the bearing. In other words, under the action of the first bearing cap 44, the grease located in the first cavity 12 and the grease located in the first bearing can be effectively isolated. Besides preventing leakage, it also avoids the mixing of greases with different properties, which could affect the mechanical system and the performance of the first bearing. In one embodiment, to ensure that the grease in the first bearing is completely sealed inside, first bearing caps 44 are provided on both opposite sides of the first bearing, thereby forming a closed space within the first rotational clearance 43, effectively preventing grease leakage.

[0094] In one embodiment, please continue to refer to the appendix. Figures 1-2To maximize the oil-proof performance between the first cavity 12 and the second cavity 13, this embodiment also includes an oil storage cavity 14 within the through hole 111. The oil storage cavity 14 is specifically located on the side of the first support member 40 opposite to the first cavity 12. In embodiments where the first support member 40 forms a first rotational gap 43 via the first fixing member 41 and the first movable member 42, the oil storage cavity 14 communicates with the first rotational gap 43 (in the absence of the first bearing cover 44). The main function of the oil storage cavity 14 in this embodiment is to store grease extending from the first support member 40, preventing further seepage into the second cavity 13. In other words, the oil storage cavity 14 acts as a buffer in this oil-proof structure. Thus, even if the oil-blocking ring 31 (and the first bearing cover 44) deteriorates in physical performance, causing grease leakage at the first support member 40, the grease can be temporarily stored in the oil storage cavity 14 instead of being directly lost or affecting the second cavity.

[0095] As one specific way of forming the oil storage cavity 14, such as Figures 1-2 As shown, the drive unit 92 of the power unit 90 is rotatably disposed in the through hole 111 via the second support member 50. This can also be understood as the coupling assembly 20 (flexible member 21) being rotatably disposed within the through hole 111 via the second support member 50. The function of the second support member 50 within the through hole 111 is similar to that of the first support member 40 described above. The adapter 30 is supported by the first support member 40, and the drive unit 92 of the power unit 90 is supported by the second support member 50. This ensures that the two have high assembly accuracy within the through hole 111 and can maintain a relatively stable state during operation. In addition to improving the transmission efficiency between the power unit 90 and the input member 70, it can also avoid assembly errors other than those between the input member 70 and the drive unit 92 of the power unit 90. This controls the positional difference between the input member 70 and the drive unit 92 of the power unit 90 within a compensable range, making the operation of the transmission mechanism more stable and reliable.

[0096] Based on the above, this embodiment will not provide further detailed descriptions of the functions and related structures provided by the second support component 50.

[0097] Based on the above embodiment, the first support member 40 and the second support member are spaced apart within the through hole 111, so that an oil storage cavity 14 is formed between the first support member 40 and the second support member 50. Thus, when the mechanical properties of the oil baffle ring 31 (and the first bearing cap 44) deteriorate, causing grease to seep from the first cavity 12 into one side of the first support member 40 and out the other side, the grease will enter the oil storage cavity 14 formed by the spaced interval between the first support member 40 and the second support member 50. Since the first support member 40 and the second support member 50 have a certain thickness relationship, the first support member 40 and the second support member 50 enclose a relatively sealed space (oil storage cavity 14) within the through hole 111 to store the leaked grease. Furthermore, the grease stored in the oil storage cavity 14 will not immediately seep into the second cavity 13 through the second bearing member, providing a relatively sufficient buffer time for the maintenance and repair of the transmission mechanism.

[0098] As can be seen from the above, the first support member 40 and the second support member 50 play similar functional roles in the transmission mechanism. Therefore, in the embodiment where the drive unit of the power unit 90 is rotatably disposed in the through hole 111 via the second support member 50, as a specific structural form of the second support member 50, such as... Figure 2 As shown, the second support component 50 includes a second fixed member 51 and a second movable member 52. The second fixed member 51 is interference-fitted with the wall of the through hole 111 along the circumferential direction. The second movable member 52 is rotatably disposed within the second fixed member 51. Furthermore, the friction between the second fixed member 51 and the second movable member 52 can be further reduced by adding rolling elements, thereby improving the power transmission efficiency of the coupling assembly 20 as one of the transmission structures between the power unit 90 and the input component 70.

[0099] It is understandable that, due to machining errors and assembly errors, gaps may form between the second fixing member 51 and the wall of the through hole 111, and between the second movable member 52 and the drive part 92 of the power unit 90. Therefore, in this embodiment, an interference fit assembly method is used between the second fixing member 51 and the wall of the through hole 111, and between the second movable member 52 and the drive part 92 of the power unit 90. It should be understood that an interference fit is an assembly method that utilizes the elasticity of the material to deform the components and ultimately achieve a nested relationship, making the two parts tightly connected. This tight connection method can effectively prevent dust, contaminants, and other substances from entering, and at the same time prevent grease in the oil storage cavity 14 from seeping into the second cavity 13 from the mating surfaces between the two, thereby extending the service life of the power unit 90.

[0100] In some other embodiments, the sealing performance between the second fastener 51 (and the first fastener 41) and the wall of the through hole 111 can be further improved by applying sealant before assembly, thereby maximizing the prevention of grease leakage at the first support member 40 and the second support member 50.

[0101] As can be understood from the above description of the first support member 40, a first rotational gap 43 is formed between the first fixed member 41 and the first movable member 42. Therefore, in the embodiment where the second support member 50 includes the second fixed member 51 and the second movable member 52, a second rotational gap 53 is also objectively formed between the second fixed member 51 and the second movable member 52, which poses a risk that grease may seep into the second chamber through the second rotational gap 53 in the oil storage cavity 14. Therefore, taking the second support member 50 as an example, in this embodiment, the second fixed member 51 is set as the outer ring of the second bearing, the second movable member 52 is set as the inner ring of the second bearing, and the second bearing cover 54 is provided on both sides of the second bearing. The second bearing cover 54 is specifically set between the second fixed member 51 (the outer ring of the second bearing) and the second movable member 52 (the inner ring of the second bearing) to block the second rotation gap 53, thereby isolating the oil storage cavity 14 from the second rotation gap 53 and the second cavity 13, reducing the possibility of grease in the oil storage cavity 14 seeping into the second rotation gap 53 and grease in the second rotation gap 53 seeping into the second cavity 13.

[0102] In one embodiment, please refer to the appendix to the specification. Figures 1-2 The adapter 30 has a countersunk hole 32 on the side near the first cavity 12. One end of the input component 70 is inserted into the countersunk hole 32. In this embodiment, there are no strict limitations or requirements on the assembly method of the countersunk hole 32 and the input component 70. However, it should be noted that the structure of the countersunk hole 32 and the structure of the input component 70 for insertion into the countersunk hole 32 should be matched as closely as possible so that the hole wall and bottom of the countersunk hole 32 can maintain a basically stable fit with the input component 70. The tighter the fit between the hole wall of the countersunk hole 32 and the end of the input component 70, the better the fit between the adapter 30 and the input component 70. The improved assembly precision and stability between the power unit 90 and the input component 70 not only enhance the transmission efficiency between them but also improve the oil resistance between the adapter 30 and the input component 70. Due to the angled structure between the sidewall and bottom wall of the countersunk hole 32, a labyrinth-like seal can be formed between the input component 70 and the sidewall of the countersunk hole 32 after the input component 70 is inserted into the countersunk hole 32. This prevents grease from seeping into the gap between the input component 70 and the adapter 30, and reduces the probability of carbon buildup and other problems between them to some extent.

[0103] In one embodiment, after the input component 70 is inserted into the countersunk hole 32, the input component 70 and the adapter 30 are further engaged by screws to improve the assembly stability between them.

[0104] Based on any of the above embodiments, the inner wall of the through hole 111 is provided with a limiting platform 112 protruding in the circumferential direction. The side of the first support member 40 away from the oil baffle ring 31 abuts against the limiting platform 112. The limiting platform 112 can constrain and limit the specific installation position of the first support member 40 in the through hole 111, ensuring that the first support member 40 will not leak grease between itself and the hole wall of the through hole 111 due to problems such as installation position deviation or poor stability, thereby effectively improving the transmission stability and oil discharge performance of the transmission mechanism.

[0105] In an embodiment where the first support member 40 includes a first fixing member 41 and a first movable member 42, in order to avoid interference of the limiting platform 112 with the rotation of the first movable member 42 relative to the first fixing member 41, the height of the limiting platform 112 protruding from the wall of the through hole 111 should not be set higher than the height of the first fixing member 41 protruding from the wall of the through hole 111.

[0106] Continue to refer to the instruction manual appendix Figure 1 As can be seen from the above, the input component 70 and the drive unit 92 of the power unit 90 in this embodiment adopt a split structure. The input component 70 is set as a relatively independent component in the first cavity 12. In order to improve the stability of the power unit 90 and the input component 70 during the transmission process, taking the two opposite ends of the input component 70 as the first end and the second end respectively as an example, the input component 70 is fixedly connected to the adapter 30 through its first end, and the second end of the input component 70 is rotatably connected to the housing 10 through the third support component 60.

[0107] In this embodiment, the third support member 60 has similar function and structure to the first support member 40 and the second support member 50. They can all provide support for the end of the input member 70 through bearings so that both ends of the input member 70 are stably mounted in the first cavity 12.

[0108] Please refer to the instruction manual attached. Figure 1This utility model also provides a geared motor, which, in addition to the transmission mechanism provided in any of the above embodiments, further includes a power unit 90. The power unit 90 generally refers to a device that provides power to machinery or equipment. In this geared motor, the power unit 90 is mainly responsible for converting electrical energy or other forms of energy into mechanical energy, thereby driving the coupling assembly 20 to operate. The coupling assembly 20 then transmits power to the output component 80 through the adapter 30 and the input component 70, achieving the functions of deceleration and power output. The power unit 90 can be, but is not limited to, an electric motor, a hydraulic motor, or a pneumatic motor. In this embodiment, the power unit 90 is fixedly installed in the second cavity 13 of the housing 10 via a fixing part 91. The drive part 92 of the power unit 90 is rotatably located within its fixing part 91 and connected to the coupling assembly 20, thereby achieving the purpose of transmitting power to the input component 70.

[0109] For example, in an embodiment where an electric motor is used as the power unit 90, the stator of the motor serves as the fixed part 91 of the power unit 90, while the rotor of the motor serves as the driving part 92 of the power unit 90.

[0110] In summary, by adopting the above-described embodiments, the geared motor can effectively prevent grease from leaking from the first cavity 12 to the second cavity 13, greatly reducing the risk of mechanical and electrical failures in the geared motor, thereby effectively extending the service life of the electric wheelchair and improving the user experience.

[0111] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0112] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0113] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0114] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A transmission mechanism, characterized in that, include: The housing (10) has a hollow mounting cavity inside. The housing (10) is provided with a partition (11) inside the mounting cavity. The partition (11) divides the mounting cavity into a first cavity (12) and a second cavity (13). The partition (11) is also provided with a through hole (111) connecting the first cavity (12) and the second cavity (13). The coupling assembly (20) is rotatably connected to the through hole (111) via a first support member (40), wherein the coupling assembly (20) has an oil baffle ring (31) extending outward at one end near the first cavity (12) and circumferentially blocking at least part of the first support member (40).

2. The transmission mechanism according to claim 1, characterized in that, The transmission mechanism also includes: The power unit (90) is at least partially disposed in the second cavity (13); The input component (70) is at least partially disposed in the first cavity (12); One end of the coupling assembly (20) is connected to the power unit (90), and the other end is connected to the input component (70).

3. The transmission mechanism according to claim 2, characterized in that, The coupling assembly (20) includes: An adapter (30) is disposed at one end of the through hole (111) near the first cavity (12) and connected to the input component (70); the oil baffle ring (31) is disposed on the adapter (30); A flexible component (21) is disposed between the power unit (90) and the adapter (30) and connects the power unit (90) and the adapter (30) respectively.

4. The transmission mechanism according to claim 3, characterized in that, The coupling assembly (20) further includes a transition connector (22) disposed between the adapter (30) and the flexible component (21); The adapter (30) has a first limiting groove (33) at one end, and the flexible component (21) has a second limiting groove (211) facing the opening of the first limiting groove (33). The transition connector (22) is interference-fitted with the second limiting groove (211). The adapter (30) is inserted into the second limiting groove (211) and interference-fitted with the transition connector (22) through the first limiting groove (33).

5. The transmission mechanism according to claim 3, characterized in that, The first support member (40) includes: The first fixing member (41) is fixedly disposed on the wall of the through hole (111) along the circumferential direction; The first movable part (42) is rotatably disposed in the first fixed part (41) and fixedly connected to the adapter (30), and a first rotation gap (43) is formed between the first fixed part (41) and the first movable part (42); The oil baffle ring (31) blocks the first rotation gap (43) at one end near the first cavity (12).

6. The transmission mechanism according to claim 5, characterized in that, The first support member (40) is configured as the first bearing, the first fixing member (41) is configured as the outer ring of the first bearing, and the first movable member (42) is configured as the inner ring of the first bearing; A first bearing cover (44) is provided on the side of the first bearing near the first cavity (12), and the oil baffle ring (31) covers the first bearing cover (44).

7. The transmission mechanism according to claim 3, characterized in that, The power unit (90) is at least partially rotatably disposed in the through hole (111) via the second support member (50); The first support member (40) and the second support member (50) are spaced apart within the through hole (111) so that an oil storage cavity (14) is formed between the first support member (40) and the second support member (50).

8. The transmission mechanism according to claim 3, characterized in that, The power unit (90) is at least partially rotatably disposed in the through hole (111) via a second support member (50), the second support member (50) comprising: The second fastener (51) is interference-fitted with the wall of the through hole (111) along the circumferential direction; The second movable member (52) is rotatably disposed within the second fixed member (51) and the second movable member (52) is interference-fitted with the power unit (90).

9. The transmission mechanism according to claim 8, characterized in that, The second support member (50) is configured as the second bearing, the second fixing member (51) is configured as the outer ring of the second bearing, and the second moving member (52) is configured as the inner ring of the second bearing; The second bearing is provided with a second bearing cap (54) on both opposite sides.

10. The transmission mechanism according to claim 3, characterized in that, The adapter (30) has a countersunk hole (32) on the side near the first cavity (12), and one end of the input component (70) is inserted into the countersunk hole (32).

11. The transmission mechanism according to any one of claims 2-10, characterized in that, The inner wall of the through hole (111) is provided with a limiting platform (112) protruding in the circumferential direction, and the side of the first support member (40) away from the oil baffle ring (31) abuts against the limiting platform (112).

12. The transmission mechanism according to any one of claims 3-10, characterized in that, The input component (70) has a first end and a second end, and the input component (70) is fixedly connected to the adapter (30) through its first end; The second end of the input component (70) is rotatably connected to the housing (10) via a third support component (60).

13. A geared motor, characterized in that, include: The transmission mechanism as described in any one of claims 2-12; The power unit (90) is fixedly installed in the second cavity (13) by the fixing part (91), and the driving part (92) of the power unit (90) is connected to the coupling assembly (20).

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