Electric actuator clutch and lock structure based on shaft bearing support

Abstract

The utility model belongs to mechanical drive technical field, concretely relates to a kind of electric actuator clutch locking structure based on shafting bearing support, including unlocking pull wire, pull wire fixed block, unlocking block, unlocking return spring, unlocking shaft, unlocking floating bearing, unlocking dog, be unlocked tooth, fixed body and clasp spring;The pull wire fixed block is embedded in the unlocking block, one end of the unlocking pull wire is fixedly connected with the pull wire fixed block, the other end of the unlocking pull wire is worn out the unlocking block, for driving pull wire fixed block by pulling unlocking pull wire and driving unlocking block to move.The utility model is by unlocking block sliding sleeve setting fixed body, unlocking shaft, unlocking floating bearing and the like are coaxially set from top to bottom, save additional positioning member, substantially compress axial dimension, can be adapted to ≤35mm miniaturization shafting, satisfy electric actuator and other small space installation demand.

Description

Technical Field

[0001] This utility model belongs to the field of shaft and bearing technology in mechanical transmission. Specifically, it relates to an electric actuator clutch locking structure based on shaft bearing support, which is particularly suitable for transmission devices that require high-precision shaft positioning, low-friction bearing matching and integrated locking function. Background Technology

[0002] In mechanical transmission systems, the fitting accuracy and support stability of the shaft system (such as the unlocking shaft) and bearings directly determine the operational reliability of the clutch locking structure. This type of structure is widely used in electric actuators, precision machine tools, and other equipment requiring "shaft transmission + locking control." With the miniaturization of equipment, the market demands shaft components with "high-precision support (radial runout ≤0.08mm), low friction loss (friction coefficient ≤0.1), and integration with locking function." However, existing technologies have the following related shortcomings:

[0003] Separation of shaft support and locking functions: In existing patents (such as CN220865412U), the unlocking shaft and bearing are designed separately. The bearing only undertakes a single rotational support function and is not linked with the locking action, resulting in the radial runout of the shaft exceeding 0.15mm. The outer ring of the bearing wears faster due to the axial load offset during locking, which does not meet the requirements of shaft support accuracy.

[0004] Shaft-bearing fit parameters out of control: The existing scheme does not specify the fit tolerance between the shaft and the bearing. The fit clearance between the unlocking shaft and the bearing inner hole fluctuates by ±0.08mm. After long-term use, the bearing clearance increases and the shaft vibration intensifies. This not only causes fluctuations in the unlocking force, but also shortens the bearing life (by 40% compared to the design value), which violates the design principle of "low loss and long life" for shaft components.

[0005] Poor coordination between shaft transmission and locking: In the existing structure, the circumferential fit between the shaft (unlocking shaft) and the locking component (unlocking pawl) lacks precision control. The use of clearance fit often leads to shaft free rotation, requiring additional positioning components and increasing the axial dimension of the shaft (≥45mm). This makes it unsuitable for the installation requirements of miniaturized shaft systems (axial dimension ≤35mm).

[0006] Furthermore, traditional structures are not optimized for "silent operation" of shaft components. Direct metal-to-metal contact between the shaft and bearing can easily generate noise levels exceeding 65dB, which does not meet the requirements for low-noise shaft systems (≤50dB) in medical equipment and other applications. Therefore, developing an integrated structure that combines shaft support, bearing fit, and locking function is crucial to overcoming these shortcomings. Utility Model Content

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an electric actuator clutch locking structure based on shaft bearing support.

[0008] According to the present invention, an electric actuator clutch locking structure based on shaft bearing support is provided, including an unlocking cable, a cable fixing block, an unlocking block, an unlocking return spring, an unlocking shaft, an unlocking suspension bearing, an unlocking pawl, an unlocked tooth, a fixing body, and a retaining spring.

[0009] The pull wire fixing block is embedded in the unlocking block. One end of the unlocking pull wire is fixedly connected to the pull wire fixing block, and the other end of the unlocking pull wire passes through the unlocking block. It is used to drive the pull wire fixing block to move the unlocking block by pulling the unlocking pull wire.

[0010] The unlocking block is slidably sleeved in the fixed body. The unlocking return spring is provided on the periphery of the unlocking block. The top end of the unlocking return spring is fixedly connected to the inner top surface of the fixed body, and the bottom end of the unlocking return spring is fixedly connected to the bottom stepped platform of the unlocking block, thus forming the reset component of the unlocking block.

[0011] The unlocking suspension bearing is embedded in the middle of the bottom cavity of the unlocking block, and the unlocking shaft is axially inserted into the inner hole of the unlocking suspension bearing. The unlocking suspension bearing enables a low-friction fit between the unlocking shaft and the unlocking block.

[0012] The unlocking claw is axially sleeved in the middle of the unlocking shaft, and the unlocking claw is engaged with the unlocking block and moves axially synchronously with the unlocking block;

[0013] The unlocking tooth is axially sleeved at the bottom of the unlocking shaft, and the unlocking tooth is correspondingly adapted to the bottom of the unlocking claw.

[0014] The retaining ring is sleeved on the outer periphery of the unlocking shaft, and the retaining ring abuts against the top of the unlocking claw to axially limit the unlocking claw.

[0015] In a preferred embodiment: the unlocking block includes an unlocking block body, a cover, a hook, and a fixing slot; the top of the unlocking block body is provided with the fixing slot, and the pull wire fixing block is limited and installed in the fixing slot to realize synchronous linkage between the pull wire fixing block and the unlocking block body.

[0016] In a preferred embodiment: the bottom of the unlocking block body is fixedly installed with the abutment along the axial direction, and a plurality of hooks are installed at circumferential intervals on the bottom of the abutment. The hooks are arc-shaped hook structures, and an annular cavity is formed between the hooks and the bottom surface of the abutment for the movement of the retaining ring of the unlocking claw.

[0017] In a preferred embodiment: the unlocking shaft includes a locking shaft body, a slot, and a fixing slot; the slot and the fixing slot are spaced apart from top to bottom on the outer periphery of the middle part of the locking shaft body, the retaining spring is adapted to be fitted into the slot, and the fixing slot is used to install the fixing clip of the locking shaft body to realize the axial positioning of the unlocking shaft and the external component.

[0018] In a preferred embodiment: the unlocking claw includes a chuck, a retaining ring, and claw blocks; the retaining ring is fixedly installed radially at the center of the outer periphery of the chuck, and the retaining ring is correspondingly adapted to the hook of the unlocking block. The unlocking block pulls the retaining ring through the hook to drive the unlocking claw to move synchronously axially; a plurality of claw blocks are installed circumferentially at intervals on the bottom of the chuck, and the claw blocks are correspondingly engaged with the locking ring of the unlocked tooth.

[0019] In a preferred embodiment: the unlocked tooth includes a locking tooth ring and a guide cone; each tooth of the locking tooth ring is equipped with a guide cone at its top, and the top of the guide cone has a conical structure to guide the unlocking claw to slide into the tooth groove of the locking tooth ring with low resistance.

[0020] In a preferred embodiment: the top left and right sides of the locking shaft body of the unlocking shaft are provided with non-cylindrical surfaces, which are adapted to and cooperate with the non-cylindrical holes corresponding to the top of the chuck of the unlocking claw; and a gap is provided between the bottom of the unlocking block and the bottom surface of the inner cavity of the fixed body, which is used to avoid sliding friction between the unlocking block and the fixed body, and in conjunction with the self-lubricating characteristics of the unlocking suspension bearing, the shaft system operating noise is ≤48dB.

[0021] In a preferred embodiment: a mating gap and a locking distance are provided between the pawl block of the unlocking pawl and the locking tooth ring of the unlocked tooth. The mating gap is used to compensate for assembly errors, and the locking distance is used to ensure reliable locking between the pawl block and the locking tooth ring.

[0022] In a preferred embodiment: the bottom of the unlocking claw block is a conical structure, the top of the guide cone block of the unlocked tooth is a conical structure, the conical surface of the claw block and the conical surface of the guide cone block are adapted and fitted together, and the unlocking block is smoothly returned to its original position through the conical surface guiding fit.

[0023] In a preferred embodiment: the outer periphery of the middle part of the locking shaft body of the unlocking shaft is provided with a cylindrical surface, which is fully fitted with the inner hole of the unlocking suspension bearing and slides with the inner wall of the bottom groove cavity of the unlocking block, so as to reduce the load during the unlocking process and achieve smooth unlocking.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This utility model uses an unlocking block to slide and fix the main body, and the unlocking shaft, unlocking suspension bearing, etc. are coaxially sleeved from top to bottom, eliminating the need for additional positioning parts, greatly reducing the axial dimension, and can be adapted to miniaturized shaft systems ≤35mm, meeting the installation requirements of electric actuators and other small spaces.

[0026] 2. This utility model prevents free rotation by matching the non-cylindrical surface of the unlocking shaft with the pawl, controls the clearance by fitting the suspension bearing to the cylindrical surface of the shaft, and ensures that the radial runout of the shaft system is ≤0.08mm. The fit clearance prevents friction, and combined with the self-lubricating bearing, the lifespan is extended by more than 40% compared with the traditional structure.

[0027] 3. This utility model compensates for assembly errors by using a gap between the claw block and the locking tooth ring, and maintains the biting force by locking the distance. The conical surfaces of the two are in contact to guide coaxial reset, and the return spring provides stable elasticity, avoiding fluctuations in unlocking force and jamming, thus eliminating failure.

[0028] 4. This utility model prevents slippage and friction by using the gap between the unlocking block and the fixed body, and reduces metal contact by using the self-lubricating suspension bearing. Together, these features make the shaft system operating noise ≤48dB, which is lower than the ≤50dB standard, making it suitable for noise-sensitive scenarios such as medical equipment. Attached Figure Description

[0029] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the unlocking block of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the fixing body of this utility model;

[0033] Figure 4 This is a schematic diagram of the unlocking shaft of this utility model;

[0034] Figure 5 This is a schematic diagram of the unlocking claw of this utility model;

[0035] Figure 6 This is a schematic diagram of the unlocked tooth of this utility model.

[0036] The following are the labeling elements in the figure:

[0037] Detailed Implementation

[0038] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0039] like Figure 1-6 As shown, this utility model discloses an electric actuator clutch locking structure based on shaft bearing support, including an unlocking cable 1, a cable fixing block 2, an unlocking block 3, an unlocking return spring 4, an unlocking shaft 5, an unlocking suspension bearing 6, an unlocking pawl 7, an unlocked tooth 8, a fixing body 9, and a retaining spring 10.

[0040] The pull wire fixing block 2 is set inside the unlocking block 3. One end of the unlocking pull wire 1 is fixedly connected to the pull wire fixing block 2, and the other end of the unlocking pull wire 1 passes through the unlocking block 3, so that the unlocking pull wire 1 can be pulled to drive the pull wire fixing block 2 to drive the unlocking block 3.

[0041] The unlocking block 3 is axially slidably sleeved inside the fixed body 9. In the locked state, there is a gap between the bottom of the unlocking block 3 and the fixed body 9 to avoid sliding friction. The unlocking block 3 is provided with an unlocking return spring 4 on its periphery. The top of the unlocking return spring 4 is fixedly connected to the inner top surface of the fixed body 9, and the bottom of the unlocking return spring 4 is fixedly connected to the bottom stepped platform of the unlocking block 3. Thus, the unlocking return spring 4 serves as a reset component between the unlocking block 3 and the fixed body 9.

[0042] An unlocking suspension bearing 6 is installed in the stepped hole in the middle of the bottom cavity of the unlocking block 3. The unlocking suspension bearing 6 is a self-lubricating sliding bearing. The unlocking suspension bearing 6 is axially sleeved in the middle of the unlocking shaft 5. The inner ring of the unlocking suspension bearing 6 is clearance-fitted with the outer circumference of the middle part of the unlocking shaft 5. The unlocking shaft 5 reduces the unlocking load by sliding with the unlocking block 3 through the unlocking suspension bearing 6.

[0043] The unlocking shaft 5 is axially fitted with an unlocking claw 7 in the middle. After the unlocking shaft 5 and the unlocking claw 7 are assembled with non-cylindrical surfaces, a torque wrench is used to test the circumferential transmission torque to ensure that there is no slippage under no-load torque. After assembly, the radial runout of the shaft system is tested by a coordinate measuring machine. The unlocking claw 7 and the unlocking block 3 are engaged accordingly.

[0044] The bottom of the unlocking shaft 5 is axially fitted with an unlocked tooth 8, which is correspondingly set with the unlocking claw 7. A gap and a locking distance are provided between the unlocking claw 7 and the unlocked tooth 8 to ensure the reliability of the locking.

[0045] The retaining ring 10 serves as a limiting component for the unlocking claw 7, and the retaining ring 10 axially limits the unlocking claw 7.

[0046] The unlocking block 3 includes an unlocking block body 31, a cover 32, hooks 33, and a fixing slot 34. The top left and right sides of the unlocking block body 31 are provided with non-cylindrical surfaces, which are used to correspond to the openings on the top of the fixing body 9, so that the fixing body 9 can be driven to rotate with the unlocking block 3 in the locked state. The top of the unlocking block body 31 is provided with a fixing slot 34, which is used to limit the installation of the pull wire fixing block 2. The cover 32 is fixedly installed at the bottom of the unlocking block body 31. Several hooks 33 are installed in a ring shape along the bottom edge of the cover 32. The hooks 33 are arc-shaped hooks, and a cavity is provided between the hooks 33 and the cover 32 for the movement of the retaining ring 72.

[0047] The unlocking shaft 5 includes a locking shaft body 51, a slot 52, and a fixing slot 53. The locking shaft body 51 has a slot 52 and a fixing slot 53 spaced apart from top to bottom in the middle. The retaining spring 10 is installed in the slot 52, and the fixing slot 53 serves as the mounting slot for the fixing member of the locking shaft body 51.

[0048] The unlocking claw 7 includes a chuck 71, a retaining ring 72, and claw blocks 73. The retaining ring 72 is fixedly installed in the middle of the ring side of the chuck 71. The retaining ring 72 is correspondingly set with the hook 33. The unlocking block 3 pulls the retaining ring 72 through the hook 33, so that the unlocking claw 7 separates from the unlocked tooth 8, thereby unlocking. Several claw blocks 73 are installed in a ring shape along the bottom edge of the chuck 71. The bottom of the claw blocks 73 is conical.

[0049] The unlocked tooth 8 includes a locking ring 81 and a guide cone 82. The teeth of the locking ring 81 engage with the claw block 73. Each tooth of the locking ring 81 is equipped with a guide cone 82 on its top. The top of the guide cone 82 is the tapered surface that adapts to the claw block 73. When the claw block 73 and the tapered surface of the guide cone 82 are in contact, the axial force is decomposed to guide the unlocking shaft 5 to return to its coaxial position, avoiding bearing jamming caused by shaft misalignment and extending the service life of the shaft system and bearings.

[0050] Working principle

[0051] When this utility model is in use, by pulling the unlocking cable 1, the unlocking cable 1 drives the cable fixing block 2 to pull the unlocking block 3 upward along the inner cavity of the fixing body 9 in the axial direction, and the unlocking return spring 4 is compressed; the hook 33 of the unlocking block 3 pulls the retaining ring 72 of the unlocking claw 7, so that the unlocking claw 7 moves upward with the unlocking block 3, and the claw block 73 disengages from the locking ring 81 of the unlocked tooth 8, while the cylindrical surface of the unlocking shaft 5 slides into the bottom groove of the unlocking block 3 to complete the unlocking;

[0052] Release the unlocking cable 1, the unlocking return spring 4 returns to its original deformation, and pushes the unlocking block 3 to reset downward along the inner cavity of the fixed body 9; the hook 33 of the unlocking block 3 drives the unlocking claw 7 to move downward, and the claw block 73 slides into the tooth groove of the locking ring 81 under the guidance of the guide cone block 82 of the unlocked tooth 8, so as to achieve engagement and locking; at the same time, the non-cylindrical surface of the unlocking shaft 5 fits against the non-cylindrical surface of the top opening of the unlocking claw 7, and the gap avoids the sliding friction between the two. The guide cone block 82 guides the unlocking block 3 to reset smoothly and complete the locking.

[0053] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 application.

[0054] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A clutch locking structure for an electric actuator based on shaft bearing support, characterized in that, It includes an unlocking pull cable (1), a pull cable fixing block (2), an unlocking block (3), an unlocking return spring (4), an unlocking shaft (5), an unlocking suspension bearing (6), an unlocking claw (7), an unlocked tooth (8), a fixing body (9), and a retaining ring (10). The pull wire fixing block (2) is embedded in the unlocking block (3). One end of the unlocking pull wire (1) is fixedly connected to the pull wire fixing block (2), and the other end of the unlocking pull wire (1) passes through the unlocking block (3) to drive the pull wire fixing block (2) to move the unlocking block (3) by pulling the unlocking pull wire (1). The unlocking block (3) is slidably sleeved inside the fixed body (9). The unlocking block (3) is provided with the unlocking return spring (4) on its periphery. The top end of the unlocking return spring (4) is fixedly connected to the inner top surface of the fixed body (9), and the bottom end of the unlocking return spring (4) is fixedly connected to the bottom stepped platform of the unlocking block (3), thus forming the reset component of the unlocking block (3). The unlocking suspension bearing (6) is embedded in the bottom cavity of the unlocking block (3), and the unlocking shaft (5) is axially inserted in the inner hole of the unlocking suspension bearing (6). The unlocking suspension bearing (6) enables low frictional engagement between the unlocking shaft (5) and the unlocking block (3). The unlocking claw (7) is axially sleeved in the middle of the unlocking shaft (5), and the unlocking claw (7) is correspondingly engaged with the unlocking block (3) and moves axially synchronously with the unlocking block (3); The unlocked tooth (8) is axially sleeved on the bottom of the unlocking shaft (5), and the unlocked tooth (8) is adapted to the bottom of the unlocking claw (7). The retaining ring (10) is sleeved on the outer periphery of the unlocking shaft (5), and the retaining ring (10) abuts against the top of the unlocking claw (7) to axially limit the unlocking claw (7).

2. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The unlocking block (3) includes an unlocking block body (31), a cover (32), a hook (33), and a fixing slot (34); the top of the unlocking block body (31) is provided with the fixing slot (34), and the pull wire fixing block (2) is limited and installed in the fixing slot (34) to realize the synchronous linkage between the pull wire fixing block (2) and the unlocking block body (31).

3. The electric actuator clutch locking structure based on shaft bearing support according to claim 2, characterized in that, The bottom of the unlocking block body (31) is fixedly installed with the cover (32) along the axial direction. The bottom of the cover (32) is equipped with a number of hooks (33) in a circumferential ring. The hooks (33) are arc-shaped hook structures, and an annular cavity is formed between the hooks (33) and the bottom surface of the cover (32) for the movement of the retaining ring (72) of the unlocking claw (7).

4. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The unlocking shaft (5) includes a locking shaft body (51), a slot (52), and a fixing slot (53); the slot (52) and the fixing slot (53) are spaced apart from top to bottom on the outer periphery of the middle part of the locking shaft body (51), the snap ring (10) is adapted to be fitted into the slot (52), and the fixing slot (53) is used to install the fixing clip of the locking shaft body (51) to realize the axial positioning of the unlocking shaft (5) and the external components.

5. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The unlocking claw (7) includes a chuck (71), a retaining ring (72), and a claw block (73); the retaining ring (72) is fixedly installed radially on the middle of the outer periphery of the chuck (71), and the retaining ring (72) is adapted to the hook (33) of the unlocking block (3). The unlocking block (3) pulls the retaining ring (72) through the hook (33) to drive the unlocking claw (7) to move axially synchronously; a number of claw blocks (73) are installed in a circumferential ring at intervals on the bottom of the chuck (71), and the claw blocks (73) are engaged with the locking ring (81) of the unlocked tooth (8).

6. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The unlocked tooth (8) includes a locking ring (81) and a guide cone (82); the top of each tooth of the locking ring (81) is equipped with the guide cone (82), and the top of the guide cone (82) is a conical structure, which is used to guide the claw block (73) of the unlocking claw (7) to slide into the tooth groove of the locking ring (81) with low resistance.

7. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The top left and right sides of the locking shaft body (51) of the unlocking shaft (5) are provided with non-cylindrical surfaces, which are adapted to and cooperate with the non-cylindrical holes opened on the top of the chuck (71) of the unlocking claw (7); and there is a gap between the bottom of the unlocking block (3) and the bottom surface of the inner cavity of the fixed body (9). The gap is used to avoid sliding friction between the unlocking block (3) and the fixed body (9). Combined with the self-lubricating characteristics of the unlocking suspension bearing (6), the shaft system running noise is ≤48dB.

8. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The claw block (73) of the unlocking claw (7) and the locking ring (81) of the unlocked tooth (8) are provided with a fitting gap and a locking distance. The fitting gap is used to compensate for assembly errors, and the locking distance is used to ensure reliable locking between the claw block (73) and the locking ring (81).

9. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The bottom of the claw block (73) of the unlocking claw (7) is a conical structure, and the top of the guide cone block (82) of the unlocked tooth (8) is a conical structure. The conical surface of the claw block (73) and the conical surface of the guide cone block (82) are adapted and fitted together, and the unlocking block (3) is smoothly returned to its original position through the conical surface guide cooperation.

10. The clutch locking structure for an electric actuator based on shaft bearing support according to claim 1, characterized in that, The locking shaft body (51) of the unlocking shaft (5) has a cylindrical surface (15) on the outer periphery of the middle part. The cylindrical surface (15) is fully fitted with the inner hole of the unlocking suspension bearing (6) and slides with the inner wall of the bottom groove of the unlocking block (3) to reduce the load during the unlocking process and achieve smooth unlocking.

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