Clutch type ball screw nut transmission

Abstract

The utility model discloses a kind of clutch type screw rod nut transmission devices, including outer shell and fixedly arranged inner shell in the inside of outer shell, radial opening is equipped on inner shell.Arc transmission nut is movably arranged in radial opening, with the thread surface towards the inside of inner shell and the connecting surface towards outer shell, connecting surface is equipped with the guide sliding slot of axial extension.Coupling operating member includes the sliding connection part embedded in guide sliding slot and the operating part that protrudes from outer shell.Radial guide mechanism includes the radial guide portion arranged on outer shell, radial guide portion has the guide channel of obliquely arranged, coupling operating member is equipped with the guide shaft of sliding cooperation with guide channel.Off coupling operating member is operated, guide shaft moves along oblique guide channel, drives arc transmission nut to move radially in radial opening, realizes the engagement or separation of arc transmission nut and screw rod.The utility model structure is simple, convenient to operate, and can realize the controllable engagement and separation of screw rod transmission.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a clutch-type lead screw and nut transmission device. Background Technology

[0002] Currently, most lead screw and nut drive structures on the market have a self-locking function. While this provides stable transmission under normal operating conditions, it has significant shortcomings in specific application scenarios. Electric-driven lead screw and nut structures cannot reverse push in the event of a power outage or equipment malfunction due to the self-locking function, preventing manual reset or emergency operation and affecting equipment safety and operability. Hand-cranked lead screw and nut structures, when faced with long strokes or frequent repetitive operations, require operators to manually crank the screw to gradually adjust the position, which is not only time-consuming and labor-intensive but also significantly increases operating costs and severely impacts work efficiency. There is an urgent need to develop a new type of lead screw and nut drive device that can flexibly select the transmission mode according to actual working conditions. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a clutch-type lead screw and nut transmission device that is simple in structure, easy to operate, and reliable in transmission.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A clutch-type lead screw and nut transmission device includes: a housing; an inner housing fixedly disposed inside the housing, the inner housing having a radial opening on its side wall; an arc-shaped transmission nut movably disposed within the radial opening, the arc-shaped transmission nut having a threaded surface facing the interior of the inner housing and a connecting surface facing the housing, the connecting surface having an axially extending guide groove; and a clutch operating member including a sliding connecting part embedded in the guide groove and an operating part extending from the housing, the clutch operating member being axially sliding relative to the arc-shaped transmission nut and driving the arc-shaped transmission nut radially. A radial guiding mechanism includes at least one radial guiding portion disposed on the outer casing, the radial guiding portion having a guide channel inclined relative to the radial direction of the outer casing, and a guide shaft disposed on the clutch operating member that slides in cooperation with the guide channel; wherein, by operating the clutch operating member, the guide shaft moves along the inclined guide channel, and the axial movement of the clutch operating member is converted into a radial component force by the inclination angle of the guide channel, thereby driving the arc-shaped transmission nut to move radially within the radial opening, realizing the engagement or disengagement of the arc-shaped transmission nut with the lead screw passing through the inner casing.

[0006] Furthermore, the guide channel includes, sequentially connected along the axial direction, a radially inner retaining section, parallel to the axial direction of the housing, for maintaining the stable position of the guide shaft when the arc-shaped transmission nut is separated from the lead screw; a radial transition section, connecting the radially inner retaining section and the radially outer retaining section, inclined relative to the axial direction of the housing, for guiding the guide shaft to perform radial displacement; and a radially outer retaining section, parallel to the axial direction of the housing and located radially closer to the outer side of the housing than the radially inner retaining section, for maintaining the stable position of the guide shaft when the arc-shaped transmission nut is engaged with the lead screw.

[0007] Furthermore, the extension path of the radial transition section can be any one of a straight line, an arc, a broken line, or a stepped shape.

[0008] Furthermore, the radial transition section is an S-shaped arc structure, including a first arc segment near the radial inner retaining section and a second arc segment near the radial outer retaining section. The radius of curvature of the first arc segment is smaller than that of the second arc segment, so that the guide shaft obtains a larger radial component force in the initial movement stage to achieve rapid separation, and slows down the radial movement speed when approaching the engagement position to achieve smooth engagement.

[0009] Furthermore, the operating part has a wedge-shaped profile and includes an inclined pushing surface facing the engagement direction of the arc-shaped transmission nut. The inclined pushing surface is provided such that when the arc-shaped transmission nut and the lead screw are in the engagement state, applying pressure to the inclined pushing surface can drive the clutch operating member to move in the disengagement direction.

[0010] Furthermore, the guide groove is a T-shaped groove structure, including: a groove portion formed on the connecting surface, extending axially; and an enlarged receiving cavity located inside the groove portion, the cross-sectional width of the enlarged receiving cavity being greater than the width of the groove portion, used to accommodate and restrict the radial movement of the sliding connection part, so that the clutch operating member and the arc-shaped transmission nut maintain a stable sliding engagement relationship.

[0011] Furthermore, the arc-shaped transmission nut also includes limiting flanges extending outward from both circumferential ends. The limiting flanges overlap the two sides of the radial opening when the arc-shaped transmission nut moves radially, thereby limiting the radial movement range of the arc-shaped transmission nut between the inner housing and the outer housing and preventing the arc-shaped transmission nut from moving excessively.

[0012] Furthermore, the outer shell includes a detachably fitted first half-shell and a second half-shell, and the radial guide mechanism includes two radial guide portions located on the first half-shell and the second half-shell and disposed opposite to each other; the device also includes an end fixing sleeve, which is fitted on the outer periphery of the ends of the first half-shell and the second half-shell for fastening the first half-shell and the second half-shell together.

[0013] Furthermore, the opposing radial guide portions have identical, axially extending arcuate contact surfaces; the arcuate contact surfaces protrude radially outward from the outer casing to form a guide seat that accommodates the guide channel; the radial dimension of the operating portion is greater than the radial height of the arcuate contact surface, so that the operating portion protrudes from the outer surface of the arcuate contact surface in any operating position, facilitating operation.

[0014] Furthermore, the outer casing is provided with a first annular mounting groove and a second annular mounting groove in sequence along the axial direction; a sealing ring is provided in the first annular mounting groove to seal the lead screw passing through the outer casing and prevent external contaminants from entering; the inner casing is fixedly installed in the second annular mounting groove.

[0015] The beneficial effects of this utility model are:

[0016] This utility model discloses a clutch-type lead screw and nut transmission device, comprising an outer shell and an inner shell fixedly disposed within the outer shell, with a radial opening on the side wall of the inner shell. An arc-shaped transmission nut is movably disposed within the radial opening, having a threaded surface facing the interior of the inner shell and a connecting surface facing the outer shell, with an axially extending guide groove on the connecting surface. The clutch operating component includes a sliding connecting part embedded in the guide groove and an operating part extending from the outer shell, which can slide axially relative to the arc-shaped transmission nut and drive the arc-shaped transmission nut to move radially. A radial guiding mechanism includes a radial guide part disposed on the outer shell, the radial guide part having an inclined guide channel, and a guide shaft slidably engaged with the guide channel on the clutch operating component. By operating the clutch operating component, the guide shaft moves along the inclined guide channel, converting the axial movement of the clutch operating component into a radial component force, driving the arc-shaped transmission nut to move radially within the radial opening, thus achieving engagement or disengagement of the arc-shaped transmission nut from the lead screw. This utility model has a simple structure, is easy to operate, and can achieve controllable engagement and disengagement of the lead screw transmission. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the disassembled structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the radial guide portion of this utility model;

[0022] Figure 5 This is a three-dimensional structural schematic diagram of the arc-shaped transmission nut of this utility model - 1;

[0023] Figure 6 This is a three-dimensional structural diagram of the arc-shaped transmission nut of this utility model - 2.

[0024] in,

[0025] 100. Outer shell; 110. First half-shell; 120. Second half-shell; 130. First annular mounting groove; 140. Second annular mounting groove;

[0026] 200. Inner shell; 210. Radial opening;

[0027] 300. Arc-shaped transmission nut; 310. Threaded surface; 320. Connecting surface; 321. Guide groove; 3211. Groove portion; 3212. Enlarged receiving cavity; 330. Limiting flange;

[0028] 400. Clutch operating element; 410. Sliding connection part; 420. Operating part; 421. Guide shaft; 422. Inclined pressing surface;

[0029] 500. Radial guide mechanism; 510. Radial guide section; 511. Guide channel; 5111. Inner radial retaining section; 5112. Radial transition section; 5113. Outer radial retaining section;

[0030] 600. End fixing sleeve;

[0031] 700, sealing ring;

[0032] 800, lead screw. Detailed Implementation

[0033] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0034] Reference Figure 1-4 A clutch-type lead screw and nut transmission device includes: a housing 100; an inner housing 200 fixedly disposed inside the housing 100, the inner housing 200 having a radial opening 210 on its side wall; an arc-shaped transmission nut 300 movably disposed within the radial opening 210, the arc-shaped transmission nut 300 having a threaded surface 310 facing the interior of the inner housing 200 and a connecting surface 320 facing the housing 100, the connecting surface 320 having an axially extending guide groove 321; and a clutch operating member 400 including a sliding connecting part 410 embedded in the guide groove 321 and an operating part 420 extending from the housing 100, the clutch operating member 400 being axially sliding relative to the arc-shaped transmission nut 300 and driving the arc-shaped transmission nut 300. 00 Radial movement; Radial guide mechanism 500, including at least one radial guide portion 510 disposed on the outer casing 100, the radial guide portion 510 having a guide channel 511 inclined relative to the radial direction of the outer casing 100, the clutch operating member 400 being provided with a guide shaft 421 slidably engaged with the guide channel 511; wherein, by operating the clutch operating member 400, the guide shaft 421 moves along the inclined guide channel 511, the axial movement of the clutch operating member 400 is converted into a radial component force by the inclination angle of the guide channel 511, driving the arc-shaped transmission nut 300 to move radially within the radial opening 210, thereby realizing the engagement or disengagement of the arc-shaped transmission nut 300 with the lead screw 800 passing through the inner casing 200.

[0035] It is understandable that when the inner housing 200 is fixedly installed inside the outer housing 100, a bolt connection or interference fit is used to ensure a stable connection between the two. A radial opening 210 is opened on the side wall of the inner housing 200. The position and size of the radial opening 210 are determined according to the parameters of the arc-shaped transmission nut 300. The arc-shaped transmission nut 300 is movably installed in the radial opening 210. Its threaded surface 310 faces the inside of the inner housing 200 and matches the external thread of the lead screw 800. The connecting surface 320 faces the outer housing 100. An axially extending guide groove 321 is opened on the connecting surface 320. The axial length of the guide groove 321 determines the adjustable stroke range of the clutch operating element 400.

[0036] The sliding connection part 410 of the clutch operating member 400 is set with corresponding external dimensions according to the internal contour of the guide groove 321. After the sliding connection part 410 is embedded in the guide groove 321, a sliding connection is formed. An appropriate fit clearance is maintained between the two to reduce frictional resistance. The operating part 420 extends out from the reserved aperture of the outer shell 100. The shape of the operating part 420 can be designed to facilitate manual operation. When the operator applies axial thrust or pull to the operating part 420, the sliding connection part 410 slides relative to the guide groove 321. The sliding motion causes the clutch operating member 400 to generate axial displacement relative to the arc-shaped transmission nut 300. Due to the mechanical constraint relationship between the sliding connection part 410 and the guide groove 321, the axial sliding simultaneously drives the arc-shaped transmission nut 300 to generate radial movement within the radial opening 210.

[0037] The radial guide portion 510 in the radial guide mechanism 500 is fixed on the housing 100. The number of radial guide portions 510 can be one or more. When there are multiple radial guide portions 510, it is necessary to ensure that their guide channels 511 are in the same plane or maintain a parallel relationship. The guide channel 511 is set with an inclination angle relative to the radial direction of the housing 100. The selection of this inclination angle affects the transmission ratio and the convenience of operation. The sliding fit between the guide shaft 421 and the guide channel 511 needs to consider lubrication and wear issues. When the clutch operating member 400 is subjected to external force, the guide shaft 421 moves along the inclined guide channel 511. The inclination angle causes the movement trajectory to deviate from the pure axial direction.

[0038] The tilt angle of the guide channel 511 decomposes the axial movement of the clutch operating element 400 into two components: radial force and axial force. The magnitude of the radial force depends on the sine value of the tilt angle. The radial force is transmitted to the clutch operating element 400 body through the guide shaft 421, and then acts on the arc-shaped transmission nut 300 connected to it. Driven by the radial force, the arc-shaped transmission nut 300 moves radially within the radial opening 210. When the radial movement causes the arc-shaped transmission nut 300 to move towards the center of the inner housing 200, the threaded surface 310 contacts the outer surface of the lead screw 800 passing through the inner housing 200 and forms a threaded engagement, realizing the transmission engagement state. When the arc-shaped transmission nut 300 moves away from the center of the inner housing 200, the threaded surface 310 separates from the lead screw 800, and the transmission connection is cut off.

[0039] In some embodiments, refer to Figure 4 The guide channel 511 includes, in sequence along the axial direction: a radially inner retaining section 5111, which is arranged parallel to the axial direction of the housing 100 and is used to maintain the stable position of the guide shaft 421 when the arc-shaped transmission nut 300 is separated from the lead screw 800; a radial transition section 5112, which is connected between the radially inner retaining section 5111 and the radially outer retaining section 5113 and is inclined relative to the axial direction of the housing 100, and is used to guide the guide shaft 421 to perform radial displacement; and a radially outer retaining section 5113, which is arranged parallel to the axial direction of the housing 100 and is located at a radial position closer to the outer side of the housing 100 than the radially inner retaining section 5111, and is used to maintain the stable position of the guide shaft 421 when the arc-shaped transmission nut 300 is engaged with the lead screw 800.

[0040] It is understood that the structure of the guide channel 511 includes three continuous functional sections. The radially inner retaining section 5111 is arranged parallel to the axial direction of the outer casing 100. The length of this section is determined according to the stability requirements of the guide shaft 421 in the separated state. The guide shaft 421 in the section can slide freely in the axial direction without generating radial displacement. The cross-sectional shape of the radially inner retaining section 5111 matches the shape of the guide shaft 421 to ensure the smooth movement and positioning accuracy of the guide shaft 421 in this section. When the arc-shaped transmission nut 300 and the lead screw 800 are separated, the guide shaft 421 is located in the radially inner retaining section 5111 and maintains a stable radial position. At this time, the clutch operating component 400 can be axially adjusted within a certain range without affecting the radial position of the arc-shaped transmission nut 300.

[0041] The radial transition section 5112 connects the inner radial retaining section 5111 and the outer radial retaining section 5113, forming an inclined portion of the guide channel 511. The radial transition section 5112 is set with a predetermined inclination angle relative to the axial direction of the housing 100. The size of the inclination angle determines the proportional relationship between radial displacement and axial displacement. The length of the radial transition section 5112 affects the smoothness of operation and the efficiency of force transmission. When the guide shaft 421 enters the radial transition section 5112 from the inner radial retaining section 5111, the axial movement begins to be converted into a radial component force. During the movement of the guide shaft 421 along the inclined radial transition section 5112, the arc-shaped transmission nut 300 gradually moves radially outward and begins to contact the lead screw 800.

[0042] In some embodiments, the extension path of the radial transition segment 5112 is any one of a straight line, an arc, a broken line, or a stepped shape.

[0043] It should be noted that the extension path of the radial transition section 5112 can be straight. In this case, the radial transition section 5112 presents as a straight inclined channel from the radial inner retaining section 5111 to the radial outer retaining section 5113. The machining of the straight path is relatively simple and the movement trajectory of the guide shaft 421 in it is clear and predictable. The constant inclination angle makes the magnitude of the radial component force remain stable throughout the transition process. When the guide shaft 421 moves along the straight radial transition section 5112, the arc-shaped transmission nut 300 performs radial displacement at a uniform rate.

[0044] The radial transition section 5112 of the arc-shaped extension path presents a smooth arc shape. The arc-shaped path can provide a smoother force change and better motion stability. The radius of curvature of the arc is determined according to the specific design requirements. A larger radius of curvature provides a smoother transition, while a smaller radius of curvature makes the transition more compact. When the guide shaft 421 moves along the arc-shaped radial transition section 5112, the magnitude of the radial component force changes with the change of the arc tangent angle.

[0045] The radial transition section 5112 of the polygonal extension path is composed of multiple straight segments with different inclination angles. Each straight segment has an independent inclination angle. The polygonal path allows for different force transmission ratios at different stages. The front section can use a smaller inclination angle to provide a larger operating stroke, while the rear section can use a larger inclination angle to provide a larger radial component force. When the guide shaft 421 passes through the polygonal radial transition section 5112, it will undergo a change of direction at the turning point.

[0046] The radial transition section 5112 of the stepped extension path contains multiple step-like structures, each step having a certain radial height difference and axial length. The stepped path provides graded radial displacement control, and the guide shaft 421 can achieve temporary positioning at each step. The stepped design is particularly suitable for applications requiring multi-level control.

[0047] Specifically, the radial transition section 5112 is an S-shaped arc structure, including a first arc segment near the radially inner retaining section 5111 and a second arc segment near the radially outer retaining section 5113. The radius of curvature of the first arc segment is smaller than that of the second arc segment, allowing the guide shaft 421 to obtain a larger radial force during the initial movement phase for rapid separation, and slowing down the radial movement speed as it approaches the engagement position for smooth engagement. The S-shaped structure consists of two interconnected arc segments. The first arc segment is located near the radially inner retaining section 5111, and its radius of curvature is set to a smaller value. This smaller radius of curvature makes the tangent angle change of the first arc segment steeper. When the guide shaft 421 enters the first arc segment from the radially inner retaining section 5111, the smaller radius of curvature generates a larger tangent tilt angle. The sine of the tilt angle directly determines the magnitude of the radial force, thus the first arc segment can provide a larger radial force to the guide shaft 421. The second arc segment is located near the radially outer retaining segment 5113. The radius of curvature of this arc segment is set to be greater than that of the first arc segment. This larger radius of curvature makes the tangent angle change of the second arc segment smoother. When the guide shaft 421 moves from the first arc segment into the second arc segment and continues to move towards the radially outer retaining segment 5113, the larger radius of curvature produces a relatively smaller tangent tilt angle, thereby reducing the radial force acting on the guide shaft 421. The smooth transition between the first and second arc segments ensures that the guide shaft 421 does not experience abrupt changes or jamming when moving between the two arc segments. During the initial movement phase, the guide shaft 421 is located within the first arc segment. The larger radial force allows the arc-shaped transmission nut 300 to quickly disengage from the lead screw 800, preventing jamming or wear during disengagement.

[0048] In some embodiments, refer to Figure 2 , 3 The operating part 420 has a wedge-shaped profile and includes an inclined pushing surface 422 facing the engagement direction of the arc-shaped transmission nut 300. The inclined pushing surface 422 is provided such that when the arc-shaped transmission nut 300 and the lead screw 800 are in the engagement state, applying pressure to the inclined pushing surface 422 can drive the clutch operating member 400 to move in the disengagement direction.

[0049] When the arc-shaped transmission nut 300 and the lead screw 800 are engaged, the guide shaft 421 is located within the radially outer retaining section 5113. At this time, the inclined pressing surface 422 of the operating part 420 is exposed outside the housing 100 and is in an operable position. The angle of the inclined pressing surface 422 allows the vertically downward external force to be decomposed into an axial component and a normal component. The axial component drives the clutch operating part 400 to move axially in the separation direction, while the normal component is borne by the housing 100 or other supporting structures. The surface treatment of the inclined pressing surface 422 adopts an appropriate roughness to provide good contact friction and avoid slippage.

[0050] When the operator applies vertical downward pressure to the inclined pressing surface 422, the geometric characteristics of the wedge-shaped profile convert the vertical force into a horizontal axial driving force. The axial driving force is transmitted to the guide shaft 421 through the clutch operating element 400. The guide shaft 421 begins to move from the radially outer holding section 5113 to the radial transition section 5112. As the guide shaft 421 moves along the radial transition section 5112 of the S-shaped arc structure, the arc-shaped transmission nut 300 gradually moves from the engaged position to the disengaged position. The angle design of the inclined pressing surface 422 ensures that even when the transmission system is under load, the operator can still achieve transmission disengagement with reasonable operating force.

[0051] In some embodiments, refer to Figure 5 The guide groove 321 is a T-shaped groove structure, including: a groove portion 3211 opened on the connecting surface 320 and extending axially; an enlarged receiving cavity 3212 located inside the groove portion 3211, the cross-sectional width of the enlarged receiving cavity 3212 being greater than the width of the groove portion 3211, used to accommodate and restrict the radial movement of the sliding connection portion 410, so that the clutch operating member 400 and the arc-shaped transmission nut 300 maintain a stable sliding fit relationship.

[0052] The width of the slot portion 3211 is determined based on the thickness of the sliding connection portion 410, ensuring that the sliding connection portion 410 can be smoothly inserted into the slot portion 3211 and achieve axial sliding. The depth of the slot portion 3211 needs to consider the insertion depth of the sliding connection portion 410 and the structural strength requirements. The two side walls of the slot portion 3211 are kept parallel and have good surface finish to reduce sliding resistance. The enlarged receiving cavity 3212 is located deep inside the slot portion 3211. The enlarged receiving cavity 3212 is formed by expanding from the bottom of the slot portion 3211 to both sides. The cross-sectional width of the enlarged receiving cavity 3212 is greater than the width of the slot portion 3211. The increase in cross-sectional width is determined based on the head size of the sliding connection portion 410. The height and depth of the enlarged receiving cavity 3212 ensure that the head of the sliding connection portion 410 can be completely accommodated within it.

[0053] The sliding connection 410 adopts a T-shaped cross-section structure that matches the T-groove structure. The sliding connection 410 includes an elongated rod that can pass through the groove portion 3211 and an enlarged head located at the end of the rod. The width of the enlarged head is greater than the width of the groove portion 3211 but less than the width of the enlarged receiving cavity 3212. When the sliding connection 410 is inserted into the T-groove structure, the enlarged head first enters the enlarged receiving cavity 3212, the elongated rod passes through the groove portion 3211, and the enlarged head can slide axially in the enlarged receiving cavity 3212 but is restricted by radial movement. The sidewall of the groove portion 3211 and the side of the enlarged head form a radial constraint to prevent the sliding connection 410 from coming out of the T-groove structure.

[0054] When the clutch operating member 400 is subjected to axial force, the sliding connection part 410 slides axially within the T-groove structure. The radial constraint of the expanded receiving cavity 3212 ensures that the sliding connection part 410 will not loosen or disengage in the radial direction, thereby ensuring effective force transmission and precise motion control.

[0055] In some embodiments, refer to Figure 5 , 6 The arc-shaped transmission nut 300 also includes limiting flanges 330 extending outward from both ends of its circumference. The limiting flanges 330 overlap the two sides of the radial opening 210 when the arc-shaped transmission nut 300 moves radially, thereby limiting the radial movement range of the arc-shaped transmission nut 300 between the inner housing 200 and the outer housing 100 and preventing the arc-shaped transmission nut 300 from moving excessively.

[0056] The thickness of the limiting flange 330 needs to balance structural strength and weight control requirements. The two sides of the radial opening 210 form a bearing surface on the side wall of the inner housing 200. When the arc-shaped transmission nut 300 moves radially, the limiting flange 330 and the two sides of the radial opening 210 maintain contact and form an overlapping fit.

[0057] When the arc-shaped transmission nut 300 moves radially inward, the limiting flange 330 overlaps the inner edge of the radial opening 210. The inner edge generates a supporting reaction force on the limiting flange 330, preventing the arc-shaped transmission nut 300 from continuing to move towards the center of the inner housing 200. This determines the inner limit position of the radial movement of the arc-shaped transmission nut 300, ensuring that the threaded surface 310 of the arc-shaped transmission nut 300 can form an appropriate engagement depth with the lead screw 800 without over-engaging or interference. When the arc-shaped transmission nut 300 moves radially outward, the limiting flange 330 overlaps the outer edge of the radial opening 210. The outer edge blocks the limiting flange 330, preventing the arc-shaped transmission nut 300 from moving excessively towards the outer housing 100. This ensures that the arc-shaped transmission nut 300 remains within the radial opening 210 in the separated state and does not completely detach from the inner housing 200.

[0058] In some embodiments, refer to Figure 1 , 2 The outer shell 100 includes a first half-shell 110 and a second half-shell 120 that can be detachably fitted together. The radial guide mechanism 500 includes two radial guide portions 510 located on the first half-shell 110 and the second half-shell 120 and disposed opposite to each other. The device also includes an end fixing sleeve 600, which is sleeved on the outer periphery of the ends of the first half-shell 110 and the second half-shell 120 for fastening the first half-shell 110 and the second half-shell 120 together.

[0059] Two radial guide portions 510 in the radial guide mechanism 500 are respectively located on the first half-shell 110 and the second half-shell 120. The two radial guide portions 510 are arranged opposite each other and axially aligned to ensure that the guide shaft 421 can be simultaneously embedded in the guide channels 511 of the two radial guide portions 510. The end fixing sleeve 600 is fitted as a fastening component on the outer periphery of the ends of the first half-shell 110 and the second half-shell 120. The end fixing sleeve 600 fastens the two half-shells together into a complete outer shell 100 through a threaded connection or a snap-fit ​​mechanism. The split structure facilitates assembly and maintenance, while the end fixing sleeve 600 ensures the reliability and stability of the connection.

[0060] In some embodiments, the opposing radial guide portions 510 have the same arcuate contact surface extending axially; the arcuate contact surface protrudes radially outward from the housing 100 to form a guide seat for accommodating the guide channel 511; the radial dimension of the operating portion 420 is greater than the radial height of the arcuate contact surface, so that the operating portion 420 protrudes from the outer surface of the arcuate contact surface in any operating position, facilitating operation.

[0061] The radius of curvature of the arc-shaped contact surface is determined according to the motion trajectory of the guide shaft 421 and the requirements for operational comfort. The two arc-shaped contact surfaces are symmetrically distributed after the outer shell 100 is assembled, providing support and guidance for the guide shaft 421. The arc-shaped contact surfaces protrude radially outward from the outer shell 100 to form a guide seat structure. The protrusion height and contour shape of the guide seat accommodate the guide channel 511. The guide channel 511 opened inside the guide seat includes a radially inner retaining section 5111, a radially transitioning section 5112, and a radially outer retaining section 5113. The structural strength of the guide seat ensures that it will not deform or be damaged when bearing the motion load of the guide shaft 421.

[0062] The radial dimension of the operating part 420 is greater than the radial height of the arc-shaped contact surface. The difference in radial dimension ensures that the operating part 420 can protrude from the outer surface of the arc-shaped contact surface when the guide shaft 421 is located at any position of the guide channel 511. When the guide shaft 421 is located in the radially inner holding section 5111, the protrusion of the operating part 420 reaches its maximum value. When the guide shaft 421 is located in the radially outer holding section 5113, the operating part 420 still maintains a sufficient protrusion. The protruding design of the operating part 420 allows the operator to easily access and operate it in any working state.

[0063] In some embodiments, refer to Figure 3 The outer shell 100 is provided with a first annular mounting groove 130 and a second annular mounting groove 140 in sequence along the axial direction; a sealing ring 700 is provided in the first annular mounting groove 130 to seal the lead screw 800 passing through the outer shell 100 and prevent external contaminants from entering; the inner shell 200 is fixedly installed in the second annular mounting groove 140.

[0064] The sealing ring 700 is installed in the first annular mounting groove 130. The sealing ring 700 is made of wear-resistant and aging-resistant rubber or polymer material. The inner diameter of the sealing ring 700 forms an appropriate interference fit with the outer diameter of the lead screw 800. When the lead screw 800 passes through the outer shell 100, the sealing ring 700 is tightly attached to the surface of the lead screw 800, preventing external dust, moisture, oil and other contaminants from entering the device through the gap between the lead screw 800 and the outer shell 100. The elastic deformation of the sealing ring 700 can adapt to the axial movement of the lead screw 800 to maintain a continuous sealing effect.

[0065] The second annular mounting groove 140 is located inside the first annular mounting groove 130. The size of the second annular mounting groove 140 is set according to the outer diameter of the inner housing 200 and the installation requirements. The radial depth and axial width of the mounting groove ensure that the inner housing 200 can be stably fixed in the predetermined position. The bottom surface and side wall of the second annular mounting groove 140 provide a positioning reference for the inner housing 200. The inner housing 200 is fixedly installed in the second annular mounting groove 140 by interference fit, threaded connection or other mechanical connection. After installation, the inner housing 200 and the outer housing 100 form a stable integral structure. The radial opening 210 of the inner housing 200 maintains the correct relative position with other components in the outer housing 100.

[0066] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A clutch-type lead screw and nut transmission device, characterized in that, include: outer shell; An inner shell is fixedly disposed inside the outer shell, and a radial opening is provided on the side wall of the inner shell; An arc-shaped transmission nut is movably disposed within the radial opening. The arc-shaped transmission nut has a threaded surface facing the interior of the inner housing and a connecting surface facing the outer housing. An axially extending guide groove is provided on the connecting surface. The clutch operating component includes a sliding connection portion embedded in the guide groove and an operating portion extending from the housing. The clutch operating component can slide axially relative to the arc-shaped transmission nut and drive the arc-shaped transmission nut to move radially. A radial guiding mechanism includes at least one radial guiding portion disposed on the housing, the radial guiding portion having a guide channel that is inclined relative to the radial direction of the housing, and a guide shaft that slides with the guide channel on the clutch operating member; Specifically, by operating the clutch operating component, the guide shaft moves along the inclined guide channel. The axial movement of the clutch operating component is converted into a radial component force by the inclination angle of the guide channel, which drives the arc-shaped transmission nut to move radially within the radial opening, thereby realizing the engagement or disengagement of the arc-shaped transmission nut with the lead screw passing through the inner housing.

2. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The guide channel comprises the following components connected sequentially along the axial direction: The radially inner retaining section is arranged parallel to the axial direction of the outer casing and is used to maintain the stable position of the guide shaft when the arc-shaped transmission nut is separated from the lead screw; A radial transition section, connecting the inner radial retaining section and the outer radial retaining section, is inclined relative to the axial direction of the housing body and is used to guide the guide shaft to perform radial displacement. The radially outer retaining section is arranged parallel to the axial direction of the housing and is located at a radial position closer to the outer side of the housing than the radially inner retaining section, and is used to maintain the stable position of the guide shaft when the arc-shaped transmission nut is engaged with the lead screw.

3. The clutch-type lead screw and nut transmission device according to claim 2, characterized in that, The extension path of the radial transition section can be any one of the following: straight line, arc, broken line, or stepped.

4. The clutch-type lead screw and nut transmission device according to claim 3, characterized in that, The radial transition section is an S-shaped arc structure, including a first arc segment near the radial inner retaining section and a second arc segment near the radial outer retaining section. The radius of curvature of the first arc segment is smaller than that of the second arc segment, so that the guide shaft obtains a larger radial component force in the initial movement stage to achieve rapid separation, and slows down the radial movement speed when approaching the engagement position to achieve smooth engagement.

5. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The operating part has a wedge-shaped profile and includes an inclined pushing surface facing the engagement direction of the arc-shaped transmission nut. The inclined pushing surface is provided such that when the arc-shaped transmission nut and the lead screw are engaged, applying pressure to the inclined pushing surface can drive the clutch operating member to move in the disengagement direction.

6. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The guide groove is a T-shaped groove structure, including: The slot portion formed on the connecting surface extends axially; An enlarged receiving cavity located inside the slot portion, the cross-sectional width of the enlarged receiving cavity being greater than the width of the slot portion, is used to accommodate and restrict the radial movement of the sliding connection portion, so that the clutch operating member and the arc-shaped transmission nut maintain a stable sliding engagement relationship.

7. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The arc-shaped transmission nut also includes limiting flanges extending outward from both circumferential ends. The limiting flanges overlap the two sides of the radial opening when the arc-shaped transmission nut moves radially, thereby limiting the radial movement range of the arc-shaped transmission nut between the inner housing and the outer housing and preventing the arc-shaped transmission nut from moving excessively.

8. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The outer casing includes a detachably fitted first half-shell and a second half-shell, and the radial guide mechanism includes two radial guide portions located on the first half-shell and the second half-shell and disposed opposite to each other; The device further includes an end fixing sleeve, which is fitted around the outer periphery of the ends of the first half-shell and the second half-shell, for fastening the first half-shell and the second half-shell together.

9. The clutch-type lead screw and nut transmission device according to claim 8, characterized in that, The opposing radial guide portions have the same arc-shaped contact surface that extends axially; The arc-shaped contact surface protrudes radially outward from the outer casing to form a guide seat that accommodates the guide channel; the radial dimension of the operating part is greater than the radial height of the arc-shaped contact surface, so that the operating part protrudes from the outer surface of the arc-shaped contact surface in any operating position, which facilitates operation.

10. The clutch-type lead screw and nut transmission device according to claim 1, characterized in that, The outer casing is provided with a first annular mounting groove and a second annular mounting groove in sequence along the axial direction. A sealing ring is provided in the first annular mounting groove to seal the lead screw passing through the outer shell and prevent external contaminants from entering; the inner shell is fixedly installed in the second annular mounting groove.

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