Transmission mechanism and transmission part thereof

Abstract

The invention provides a transmission mechanism and a transmission part thereof, the transmission mechanism is used for mutually converting linear motion and rotary motion, and the transmission mechanism comprises a rolling cone part tangent to a spiral surface on a lead screw; the rolling cone part is provided with a cone-like surface, and the cone-like surface rolls on the spiral surface of the lead screw; a tangent point is arranged at the tangent position of the cone-like surface and the spiral surface, and the stroke of the tangent point on the rolling cone component is equal to the track stroke of the tangent point on the spiral surface; the transmission part comprises a transmission body used for being arranged on the lead screw in a sleeving mode. The transmission mechanism is rotatably arranged on the transmission body and used for abutting against the threaded structure of the lead screw; the problems that a lead screw transmission part kinematic pair is high in thread meshing precision requirement, prone to damage and small in bearing capacity due to the fact that balls generate sliding friction force between a lead screw and a transmission part are solved, friction resistance between the transmission part and the lead screw is reduced, energy loss in the transmission process is reduced, the abrasion degree between the parts is reduced, and the service life of the lead screw is prolonged. The transmission bearing capacity is improved, the transmission efficiency is improved, and manufacturing is easy.

Description

Technical Field

[0001] The present application relates to the technical field of transmission equipment, and in particular to a transmission mechanism and transmission components thereof. Background Art

[0002] In machining, production assembly, and automated equipment operations, transmission mechanisms play a vital role as core components enabling relative motion and power transmission between mechanical parts. In particular, transmission mechanisms are widely used in robotic actuators, mechanical clamping devices, and industrial valve control systems to achieve high-precision position control, force transmission, and motion direction conversion. Properly designed transmission systems can effectively improve equipment efficiency, stability, and responsiveness, making them an indispensable technical tool in modern manufacturing.

[0003] A ball screw transmission mechanism is a precision transmission device that converts rotational motion into linear motion. The most widely used is the ball screw kinematic pair. This mechanism primarily consists of a lead screw, typically a precision-machined, smooth shaft with a helical external thread, and a transmission component with a matching internal thread. Multiple balls are positioned between the lead screw and the transmission component, acting as rolling elements during the transmission process to reduce friction and improve transmission efficiency, thereby achieving efficient and smooth reciprocating motion. Due to their high precision, high efficiency, and long life, ball screw transmission mechanisms are widely used in high-end equipment such as CNC machine tools, robotic joints, and precision positioning platforms.

[0004] Although the ball screw transmission mechanism has many advantages, it still has certain limitations. First, due to the extremely high requirements for the threaded engagement between the screw and the transmission component, the processing is difficult and the manufacturing cycle is long, resulting in high overall costs. Secondly, the ball screw structure itself is relatively complex. The balls and the spiral surface are in point contact, and the load-bearing capacity is limited. The balls are prone to failure problems such as pitting, wear, and even fracture due to uneven force or impact loads. More importantly, in the actual working process, the direction of the angular momentum of the balls is constantly changing, indicating that they are subject to external torque. Since the normal force acting on the balls does not generate torque, the main source of change in angular momentum is friction, including static friction and sliding friction. Under the influence of factors such as spiral geometric constraints, load fluctuations or elastic deformation, micro-slip is likely to occur between the balls and the rails, making sliding friction the dominant factor. This phenomenon not only reduces transmission efficiency, but also intensifies the wear of the balls and raceways, affects the stability of the system, and places higher demands on lubrication performance, limiting the use of ball screw transmission components in certain high-load, high-frequency or high-reliability application scenarios. Summary of the Invention

[0005] In the embodiments of the present application, a transmission mechanism and a transmission component thereof are provided to solve the technical problems of the existing screw transmission component kinematic pairs having high thread engagement precision requirements, being easily damaged due to sliding friction between the balls and the transmission component, and having low bearing capacity. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present application provides a transmission mechanism for converting linear motion and rotational motion into each other, the transmission mechanism comprising: a roller cone component for being tangent to a helical surface on a lead screw;

[0007] The roller cone component has a cone-like surface, which rolls on the helical surface of the screw;

[0008] There is a tangent point where the cone-like surface and the spiral surface are tangent, and the stroke of the tangent point on the rolling cone component is equal to the trajectory stroke on the spiral surface.

[0009] In one embodiment, the helical surface and the conical surface are tangent to a straight line pointing to the axis of the screw, so that the helical surface and the conical surface are in line contact, and the conical surface and the helical surface remain tangent and perform circular rolling;

[0010] The central axis of the helicoid on the cone-like surface is the Z axis, and a cylindrical coordinate system is established, and the coordinates on the cylindrical coordinate system are (r, θ, z);

[0011] The equation of the cone-like surface in the cylindrical coordinate system is:

[0012]

[0013] Among them, θ∈(0,2π);

[0014] In this equation, r represents the vertical distance from the tangent point to the center axis of the roller assembly (i.e., the Z axis); z represents the coordinate value of the point on the Z axis; θ represents the rotation angle; k and r0 are constants, k represents that the roller rolls on the helical surface of the screw, and the roller assembly rotates k circles for one rotation on the helical surface; r0 represents the initial minimum value of r when z = 0. When the roller rolls on the helical surface, the axis of the roller remains perpendicular to the axis of the screw, and r0 is the minimum distance between the axis of the roller and the axis of the helical surface.

[0015] In a second aspect, an embodiment of the present application provides a transmission component, comprising: a transmission body, configured to be sleeved on a lead screw; and the transmission mechanism proposed in the first aspect, wherein a roller cone component is rotatably disposed on the transmission body, configured to abut against the threaded structure of the lead screw;

[0016] When the transmission body and the lead screw rotate relative to each other, the cone roller component rolls on the lead screw along the thread structure, so that the transmission body is displaced on the lead screw.

[0017] In one embodiment, the roller cone component includes: a first roller cone group and a second roller cone group; the first roller cone group and the second roller cone group are arranged on the transmission body along the spiral angle of the thread structure, and form a first force on the thread structure.

[0018] In one embodiment, the first roller cone set and the second roller cone set are arranged on opposite surfaces of the thread structure in a supporting manner, and the first force is a supporting force.

[0019] In one embodiment, a plurality of mounting holes are formed on the side wall of the transmission body along the spiral angle of the threaded structure; and the cone roller components are rotatably mounted in the corresponding mounting holes.

[0020] In one embodiment, the transmission mechanism also includes: a bearing component, installed in the corresponding mounting hole; a cone component is rotatably installed in the corresponding mounting hole through the bearing component, and the cone component extends out of the mounting hole to the inner side of the transmission body so that it can abut against the threaded structure of the screw.

[0021] In one embodiment, a side wall of the transmission body is provided with a plurality of first mounting holes and a plurality of second mounting holes along the helical angle of the threaded structure, wherein the first mounting holes and the second mounting holes are arranged in layers along the axial direction of the transmission body, the first roller cone group is disposed in each first mounting hole, and the second roller cone group is disposed in each second mounting hole;

[0022] The transmission mechanism also includes: a bearing component, which is installed in the corresponding first mounting hole or the corresponding second mounting hole; a roller cone component is rotatably connected to the bearing component, and the roller cone component extends from the corresponding first mounting hole or the corresponding second mounting hole to the inside of the transmission body so that it can abut against the threaded structure of the screw.

[0023] In one embodiment, the roller cone component has a mounting portion and an abutment portion, the mounting portion can be rotatably embedded in the bearing component, the abutment portion extends toward the center of the transmission body, and the abutment portion has a conical structure that gradually shrinks from the bearing component toward the center of the transmission body.

[0024] Compared to the prior art, the transmission mechanism and its transmission component proposed in the above technical solution significantly optimize the transmission method between the lead screw and the transmission component by replacing the internal thread structure within the traditional transmission component and the ball structure between the transmission component and the lead screw with a transmission mechanism rotatably arranged on the transmission body, thereby improving the stability and reliability of the entire transmission system. By providing a transmission mechanism instead of the traditional ball and internal thread matching method, the transmission component can roll along the thread structure of the lead screw rather than slide when the transmission component moves on the lead screw. This rolling contact method effectively reduces the frictional resistance between the transmission component and the lead screw, reducing energy loss during the transmission process and improving transmission efficiency. At the same time, because the transmission mechanism can abut the thread structure of the lead screw, the transmission method is rolling friction, and there is no sliding friction. Since rolling friction is much smaller than sliding friction, the degree of wear between components is greatly reduced, and the service life of the kinematic pair of the lead screw transmission component is extended. In addition, the improved transmission component no longer relies on the high-precision threaded engagement between the transmission component and the lead screw, thereby reducing the complexity of the manufacturing process and processing costs. Traditional ball screws have extremely high thread precision requirements, resulting in long processing cycles and high costs. However, this application relaxes the requirements for thread matching precision by introducing a rolling transmission mechanism, achieving a more economical and efficient production method while ensuring transmission performance. Because the contact between the spiral surface and the cone-like surface is line contact rather than point contact, the load-bearing capacity is large. In addition, the components with cone-like surfaces can be fixed by bearings and housings, while the balls of ball screws are not fixed by the housing. The balls roll back and forth in the threads, requiring a return mechanism.

[0025] To sum up, the present application provides a transmission mechanism and its transmission components with novel structure, stable performance, low processing cost, high operating efficiency and large load-bearing capacity, which effectively solves many defects existing in the existing technology and provides a more reliable and practical technical solution for the field of precision transmission, with good application prospects and promotion value.

[0026] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0028] Figure 1Schematic diagram of a cylinder with a radius of r0 and a right triangle plane with an angle of θ1 being tangent to each other in an embodiment of the present application;

[0029] Figure 2 A cross-sectional view of a rolling cone surface in an embodiment of the present application;

[0030] Figure 3 for Figure 2 Schematic diagram of the structure of the roller cone component;

[0031] Figure 4 A cross-sectional view of a lead screw in the implementation of this application;

[0032] Figure 5 This is a schematic diagram of the structure of the cone roller component and the lead screw in the implementation of this application;

[0033] Figure 6 This is a schematic diagram of the three-dimensional structure of the kinematic pair of the screw transmission component in the embodiment of the present application;

[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the transmission component in the embodiment of the present application;

[0035] Figure 8 This is a cross-sectional view of the transmission component in the first embodiment of the present application;

[0036] Figure 9 This is a cross-sectional view of a transmission component in the second embodiment of the present application;

[0037] Figure 10 Schematic diagram of the three-dimensional structure of the roller cone component in the embodiment of the present application.

[0038] Reference numerals:

[0039] 1. Transmission body;

[0040] 10. Mounting hole; 10a. First mounting hole; 10b. Second mounting hole;

[0041] 2. Lead screw;

[0042] 20. Thread structure; 201. First helical surface; 202. Second helical surface;

[0043] 3. Transmission mechanism;

[0044] 31. Bearing component; 32. Cone roller component; 321. Mounting portion; 322. Abutment portion. DETAILED DESCRIPTION

[0045] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0046] Reference Figures 1 to 5 as well as Figure 10 As shown, a transmission mechanism is proposed in an embodiment of the present application, which is used to convert linear motion and rotational motion into each other. The transmission mechanism includes: a roller cone component 32 for being tangent to the helical surface on the screw 2, the roller cone component 32 having a cone-like surface, and the cone-like surface rolls on the helical surface of the screw 2; wherein, the cone-like surface has a tangent point at the tangent point to the helical surface, and the trajectory stroke of the tangent point on the roller cone component 32 is equal to the trajectory stroke of the helical surface.

[0047] Furthermore, in some embodiments, the helical surface and the conical surface are tangent to a straight line pointing to the axis of the screw, so that the helical surface and the conical surface are in line contact, and the conical surface and the helical surface remain tangent and perform circular rolling;

[0048] The central axis of the helicoid on the cone-like surface is the Z axis, and a cylindrical coordinate system is established. The coordinates on the cylindrical coordinate system are (r, θ, z). The equation of the cone-like surface in the cylindrical coordinate system is:

[0049]

[0050] Among them, θ∈(0,2)π;

[0051] In this equation, r represents the vertical distance from the tangent point to the center axis of the roller component (i.e., the Z axis); z represents the coordinate value of the point on the Z axis; θ represents the rotation angle; k and r0 are constants, k represents that the roller rolls on the helical surface of the screw, and the roller component rotates k times for one rotation on the helical surface; r0 represents the initial minimum value of r when z=0. When the roller rolls on the helical surface, the axis of the roller remains perpendicular to the axis of the screw. r0 is the minimum distance between the axis of the roller and the axis of the helical surface, which can be understood as the relative position of the axis of the roller and the axis of the helical surface.

[0052] Specifically, in the technical solution adopted in this application, when the screw 2 rotates in the circumferential direction and moves in the axial direction, the axis of the roller cone component 32 does not move, and performs pure rolling on the helical surface of the screw 2, so that the cone-like surface and the helical surface form a tangent point. The linear velocity on the roller cone component 32 is equal to the linear velocity on the helical surface. When the screw rotates one circle, the tangent point on the screw 2 rotates a distance of 2πR 丝 , the translation distance is S, and the total stroke on the screw 2 is The rotation distance of the roller cone component 32 is 2πr·k. Since the displacement of the roller cone component 32 on the helical surface of the screw 2 is rolling, it can be known that the trajectory of the tangent point formed on the roller cone component 32 and the screw 2 is equal. From formula 1, we can get:

[0053]

[0054] Where r represents the vertical distance from the tangent point to the center axis of the cone roller 32; R 丝 It represents the vertical distance from the tangent point to the center axis of the screw 2; S represents the lead of the screw 2, k is a constant, and represents that the screw 2 rotates one circle. When the roller cone component 32 is tangent to the screw 2 and the movement mode is pure rolling, the roller cone component 32 rotates k circles.

[0055] In some embodiments, when R 丝 =0, R 丝 It represents the vertical distance from the tangent point to the center axis of the screw 2. That is, when the tangent point is on the center axis of the screw, r = r0. Substituting it into formula 1, we can get: 2πr0·k=s, which is formula 2:

[0056]

[0057] Substituting Equation 2 into Equation 1, we can get Equation 3:

[0058]

[0059] Reference Figure 1 and Figure 2 As shown, the angle between the hypotenuse AB of the triangle formed by the tangent contact between the roller cone component 32 and the screw and the central axis of the screw in the vertical surface is θ1, and the angle between the trapezoidal helical structure on the screw is 2α, from which we can get formula 4:

[0060]

[0061] From the variation of formula 4, we can get formula 5:

[0062]

[0063] Since the angle between the velocity of the tangent point and the horizontal plane when the cone roller moves along the helical surface is the lead angle of the cone roller in the direction of the tangent point, that is, θ2, which is also the lead angle of the helical surface, we can get Equations 6 and 7:

[0064]

[0065] In right triangle ABC,

[0066]

[0067] Substituting Equation 3 and Equation 6 into Equation 7, we can obtain Equation 8:

[0068]

[0069] From formula 8, we can get formula 9:

[0070]

[0071] Substitute Equation 9 into Equation 3, and L represents the total travel of the tangent point trajectory when the screw rotates one circle; Equation 10 can be obtained:

[0072]

[0073] Equation 10 shows that when the angle 2α of the trapezoidal screw and the lead S of the screw 32 are equal, the curve equation for the perpendicular distance r between the tangent point of the cone-like surface of the roller cone and the center axis of the cone cone and the perpendicular distance R between the tangent point and the center axis of the screw can be determined. The cone-like surface of the roller cone rotates around the center axis of the roller cone once along this curve to form the desired tapered structure of the roller cone.

[0074] In some embodiments, the helical surface of the screw 2 is formed by a spiral motion of a line segment whose extension line intersects the central axis of the screw 2. The line segment rotates at a uniform speed around the central axis and moves at a uniform speed in the axial direction. The surface passed by the line segment is the helical surface. The trapezoidal helical surface is formed by a plane where a triangle is located and a thin cylinder that is tangent. The triangle remains tangent and rotates around the cylinder. The curved surface passed by the hypotenuse of the triangle is the conical surface of the helical surface. The characteristic of the conical surface is that each cross section is circular. The hypotenuse of the triangle coincides with the line segment forming the helical surface, so that the helical surface and the conical surface can be in linear contact with the line segment, so that the two curved surfaces are tangent to the line segment pointing to the axis of the screw. Based on the tangent characteristics, this line segment is on the screw and on the roller cone component 32, and the tangent direction on the roller cone component 32 is the same as the tangent direction on the screw. The tangent direction of the helical surface of the screw is the direction of the helical angle θ. Therefore, formula 11 can be obtained:

[0075]

[0076] Where s in Equation 11 represents the lead, R 丝 Indicates the vertical distance from the tangent point to the center axis of screw 2.

[0077] like Figure 5 , the tangential direction rise angle of the cone roller component 32 is θ2, then formula 12 can be obtained:

[0078]

[0079] Since r needs to satisfy Equation 3, substitute r into Equation 12 and simplify it to obtain Equation 13:

[0080]

[0081] After comparing Equation 11 and Equation 13, refer to Figure 5 As shown, the lead angle of the cone component 32 at the tangent point is the same as the lead angle of the helical surface. It should be noted that this feature is a necessary condition for the tangency of the cone-like surface and the helical surface, so we can get Equations 14, 15, 16 and 17:

[0082]

[0083] BO 2 =BC 2 +CO 2 ---------(15)

[0084] Among them, O represents the axis vertex of the cylinder; AC represents the line segment from point A to point C; BO represents the line segment from point B to point O, BC represents the line segment from point B to point C; CO represents the line segment from point C to point O.

[0085] Right now:

[0086]

[0087] In the cylindrical coordinate system based on the helicoid, that is, the r, θ, z coordinate system, Equation 18 can be obtained, which is the equation in the above embodiment:

[0088]

[0089] Here, θ is an angle value in the open interval (0, 2π), that is, 0<θ<2π, excluding the endpoints 0 and 2π.

[0090] When the roller cone component 32 in the present application is used as a transmission mechanism that moves in a rolling manner on the screw 2, without manufacturing and fitting tolerances, it is theoretically possible for the roller cone component 32 with such a conical surface to perform pure rolling motion on the spiral structure of the screw 2; and in actual applications, the sliding distance of the roller cone component 32 on the spiral structure of the screw 2 can be reduced, making its movement more reliable.

[0091] Reference Figures 5 to 10 As shown, in an embodiment of the present application, a transmission component is further provided, which may include: a transmission body 1, which is used to be sleeved on the lead screw 2; and the transmission mechanism 3 in the above embodiment, wherein the roller cone portion 32 is rotatably configured on the transmission body 1, and is used to abut against the thread structure 20 of the lead screw 2;

[0092] When the transmission body 1 and the lead screw 2 rotate relative to each other, the transmission mechanism 3 rolls on the lead screw 2 along the threaded structure 20 , so that the transmission body 1 is displaced on the lead screw 2 .

[0093] Specifically, in the technical solution adopted by this application, after the transmission body 1 is sleeved onto the lead screw 2, the transmission body 1 can be translated on the lead screw 2 when the lead screw 2 is driven to rotate. The technical key of this application is that the internal thread structure and ball bearings that assist in rotation of the transmission body 1 are replaced with a transmission mechanism 3. The cone roller component 32 in the transmission mechanism 3 is rotatably arranged on the transmission body 1. When the transmission body 1 is sleeved onto the lead screw 2, the cone roller component 32 abuts against the thread structure 20 of the lead screw 2. During use, when the threaded body and the lead screw 2 rotate relative to each other, the cone roller component 32 can roll along the thread structure 20 of the lead screw 2 on the lead screw 2, thereby achieving translational movement of the transmission body 1 on the lead screw 2 through the cone roller component 32. This can effectively reduce the friction between the transmission component and the lead screw 2, improve the operating efficiency of the transmission component on the lead screw 2, reduce the lubrication requirements of the transmission component and the degree of wear during operation, and make the force between the transmission component and the lead screw 2 more stable.

[0094] Further, refer to Figure 7 and Figure 8 As shown, in some embodiments, the roller cone component 32 includes: a first roller cone group and a second roller cone group; the first roller cone group and the second roller cone group are arranged on the transmission body 1 along the spiral angle of the threaded structure 20, and form a first force on the threaded structure 20.

[0095] Specifically, in the technical solution adopted in the present application, the roller cone component can be divided into a first roller cone group and a second roller cone group, so that when the transmission body 1 is sleeved on the screw 2, the first roller cone group and the second roller cone group can apply a first force on the threaded structure 20, so that the first roller cone group and the second roller cone group continue to abut against the threaded structure 20 of the screw 2 when the transmission body 1 rotates, so as to roll on the threaded structure 20 of the screw 2, thereby assisting the transmission body 1 to move translationally on the screw 2.

[0096] Furthermore, in some embodiments, the first roller cone set and the second roller cone set are arranged on opposite surfaces of the thread structure 20 in a clamping manner, and the first force is a clamping force.

[0097] Specifically, in the technical solution adopted by the present application, in one embodiment, the first and second roller cone groups can be arranged in a clamping manner on opposite surfaces of the threaded structure 20 of the lead screw 2. For example, if the threaded structure 20 on the lead screw 2 is an external thread structure, the first and second roller cone groups are clamped on both sides of the external thread structure; or if the threaded structure 20 on the lead screw 2 is an internal thread structure, the first and second roller cone groups are clamped on surfaces where some internal thread grooves at different heights are close to each other, so that the first force is a clamping force, thereby ensuring that the first and second roller cone groups can continuously abut against the threaded structure 20 of the lead screw 2 when the transmission body 1 and the lead screw 2 rotate relative to each other, thereby assisting the transmission body 1 in stable translational motion on the lead screw 2.

[0098] Further, refer to Figure 8 and Figure 9 As shown, in some embodiments, the first roller cone group and the second roller cone group are arranged on opposite surfaces of the thread structure 20 in a supporting manner, and the first force is a supporting force.

[0099] Specifically, in the technical solution adopted by the present application, in one embodiment, the first and second roller cone groups can be arranged in a supporting manner on opposing surfaces of the threaded structure 20 of the lead screw 2. For example, if the threaded structure on the lead screw 2 is an external threaded structure, the first and second roller cone groups are supported on surfaces of portions of the external threaded structure at different heights that are close to each other. Alternatively, if the threaded structure 20 on the lead screw 2 is an internal threaded structure, the first and second roller cone groups are supported on opposing surfaces on the inside of the internal threaded groove, so that the first force is the supporting force. This allows the first and second roller cone groups to continuously abut against the threaded structure 20 of the lead screw 2 when the transmission body 1 and the lead screw 2 rotate relative to each other, thereby assisting the transmission body 1 in stable translational motion on the lead screw 2.

[0100] First embodiment

[0101] Further, refer to Figure 8 As shown, in some embodiments, a plurality of mounting holes 10 are provided on the side wall of the transmission body 1 along the spiral angle of the threaded structure 20; the cone roller component 32 is rotatably mounted in the corresponding mounting hole 10; the transmission mechanism also includes: a bearing component 31, which is mounted in the corresponding mounting hole, and the cone roller component 32 is rotatably mounted in the corresponding mounting hole through the bearing component, and the cone roller component extends out of the mounting hole to the inner side of the transmission body so that it can abut against the threaded structure of the screw.

[0102] Specifically, in the technical solution adopted in the present application, in order to enable the first roller cone group and the second roller cone group to be compatible with the threaded structure 20 on the screw 2, this embodiment opens a plurality of mounting holes 10 on the side wall of the transmission body 1, and the arrangement of each mounting hole 10 can be compatible with the thread angle of the threaded structure 20 on the screw 2, and the roller cone components 32 are respectively arranged in the corresponding mounting holes 10, wherein a part of the roller cone components 32 abuts against one side surface of the threaded structure 20 to serve as the first roller cone group; the remaining part of the roller cone components 32 abuts against the other side surface of the threaded structure 20 to serve as the second roller cone group. In this embodiment, the transmission mechanism may further include: a bearing component 31 embedded in the mounting hole 10, a cone component 32 rotatably mounted in the bearing component 31, and the cone component 32 extending toward the inner side of the transmission body 1 through the mounting hole 10, so that when the transmission body 1 is sleeved on the screw 2, the cone component 32 can abut against the threaded structure 20 of the screw 2, thereby realizing the replacement of the internal thread structure on the transmission component and the ball located between the transmission component and the screw 2 in the traditional technology by the cone component 32 that can roll on the threaded structure 20.

[0103] In one embodiment, taking the transmission body 1 as a quadrangular structure as an example, mounting holes 10 can be respectively opened on the four sides of the transmission body 1, and the mounting holes 10 are arranged in a spiral. In order to facilitate distinction, a virtual spiral line can be drawn in the distribution diagram of each mounting hole 10, and a rotating shaft assembly is configured in the two adjacent mounting holes 10 in the front half of the virtual spiral line as the first rotating shaft group; and the remaining two adjacent mounting holes 10 in the second half of the virtual spiral line are also configured with a rotating shaft assembly, which can serve as the second rotating shaft group.

[0104] In one embodiment, taking the transmission body 1 as a hexagonal structure as an example, mounting holes 10 can be respectively opened on the six side surfaces of the transmission body 1, and the mounting holes 10 are arranged in a spiral. In order to facilitate distinction, a virtual spiral line can be drawn in the distribution diagram of each mounting hole 10, and the three adjacent mounting holes 10 in the front half of the virtual spiral line are configured with a shaft assembly as the first shaft group; and the remaining three adjacent mounting holes 10 in the second half of the virtual spiral line are also configured with a shaft assembly, which can serve as the second shaft group.

[0105] In one embodiment, the transmission body 1 can also be an octagonal structure as an example, and the same arrangement principle as the above two embodiments is adopted, and so on. The transmission component of the present application can be a polygonal transmission component, specifically to facilitate the equidistant arrangement of the mounting holes 10, or a circular transmission component, as long as the uniform arrangement of the mounting holes 10 is achieved.

[0106] Second embodiment

[0107] Further, refer to Figure 9As shown, in some embodiments, the side wall of the transmission body 1 is provided with a plurality of first mounting holes 10a and a plurality of second mounting holes 10b along the spiral angle of the threaded structure 20, and each first mounting hole 10a and each second mounting hole 10b are arranged in layers along the axial direction of the transmission body 1, and the first roller cone group is arranged in each first mounting hole 10a, and the second roller cone group is arranged in each second mounting hole 10b; the transmission mechanism also includes: a bearing component 31, which is installed in the corresponding first mounting hole 10a or the corresponding second mounting hole 10b; the roller cone component 32 is rotatably connected to the bearing component 31, and the roller cone component 32 extends from the corresponding first mounting hole 10a or the corresponding second mounting hole 10b to the inner side of the transmission body 1, so that it can abut against the threaded structure 20 of the screw 2.

[0108] Specifically, in the technical solution adopted in the present application, in some modified embodiments, a plurality of first mounting holes 10a and second mounting holes 10b arranged in layers can be opened on the side wall of the transmission body 1, and the first mounting holes 10a and the second mounting holes 10b can be spirally arranged along the thread angle of the thread structure 20 on the screw 2, and each cone component 32 is installed in the corresponding first mounting hole 10a and the corresponding second mounting hole 10b. The cone components 32 located in the corresponding first mounting hole 10a constitute a first cone group, and the cone components 32 located in the corresponding second mounting hole 10b constitute a second cone group. Cone assembly, when the transmission body 1 is sleeved on the screw 2, each roller cone component 32 can apply a first force to the threaded structure 20 of the screw 2 in a clamping manner or a supporting manner. According to the above embodiment, when each roller cone component 32 abuts the opposite surface of the threaded structure 20 in a clamping manner, the first force is a clamping force, thereby causing the roller cone component 32 to roll on one side of the threaded structure 20; and when each roller cone component 32 abuts the opposite surface of the threaded structure in a supporting manner, the first force is a supporting force, which can also cause the roller cone component 32 to roll on one side of the threaded structure 20. It should be noted that the structure of the roller cone component 32 is the same as that of the roller cone component 32 in the first embodiment described above, so it will not be described in detail. Each first mounting hole 10a and each second mounting hole 10b can be arranged in a one-to-one correspondence or in a staggered manner, both of which are within the scope of protection of this application.

[0109] Further, refer to Figure 10 As shown, in some embodiments, the roller cone component 32 has a mounting portion 321 and an abutment portion 322, the mounting portion 321 can be rotatably embedded in the bearing component 31, the abutment portion 322 extends toward the center direction of the transmission body 1, and the abutment portion 322 has a conical structure that gradually shrinks from the bearing component 31 toward the center direction of the transmission body 1.

[0110] Specifically, in the technical solution adopted by the present application, in a further embodiment of the roller cone component 32 of the first and second embodiments described above, the roller cone component 32 has a mounting portion 321 and an abutment portion 322. The mounting portion 321 is embedded in the bearing component 31 and can rotate on its own through the bearing component 31, while the abutment portion 322 is formed at one end of the mounting portion 321 and extends toward the center of the transmission body 1. In order to ensure that the abutment portion 322 can more stably contact the thread structure 20 of the lead screw 2, the abutment portion 322 can be configured as a tapered structure. Specifically, the abutment portion 322 is configured to gradually decrease in size from the direction of the bearing component 31 toward the center of the transmission body 1. During use, after the transmission body 1 is sleeved on the screw 2, the conical surface formed on the abutment 322 can fit onto the side surface of the threaded structure 20 on the screw 2, so that when the transmission body 1 and the screw 2 rotate relative to each other, friction is generated between the abutment 322 and the threaded structure 20 on the screw 2, so that the abutment 322 can roll on the threaded structure 20 of the screw 2. In this embodiment, in order to increase the contact area between the abutment portion 322 and the threaded structure 20 on the screw 2, the surface of the threaded structure 20 on the screw 2 can be set to a structure that is compatible with the conical surface of the abutment portion 322. For example, the surface of the threaded structure 20 is set to an inclined surface that can fit with the conical surface of the abutment portion 322. This not only makes the fit between the conical surface of the abutment portion 322 and the surface of the threaded structure 20 more secure, but also avoids the necessary friction between the abutment portion 322 and the threaded structure 20 because the abutment portion 322 only contacts one side surface of the threaded structure 20, thereby making the thrust of the moving pair of the screw transmission component composed of the transmission component of the present application more stable, requiring lower precision in thread processing, and reducing the processing cost increased by the thread precision requirements.

[0111] Reference Figure 5 、 Figure 8 and Figure 9 As shown, in the embodiment of the present application, a screw transmission component kinematic pair may be further provided, and the screw transmission component kinematic pair may include: a screw 2, provided with a threaded structure 20, the threaded structure 20 having a first helical surface 201 and a second helical surface 202; and the transmission component mentioned in the above embodiment, the transmission component includes: a transmission body 1, sleeved on the screw 2; a transmission mechanism 3, rotatably arranged on the transmission body 1, the transmission mechanism 3 abutting against the threaded structure 20, and the transmission mechanism 3 forming a first acting force between the first helical surface 201 and the second helical surface 202;

[0112] When the transmission body 1 and the lead screw 2 rotate relative to each other, the transmission mechanism 3 rolls on the lead screw 2 along the threaded structure 20 , so that the transmission body 1 is displaced on the lead screw 2 .

[0113] Specifically, the technical solution adopted in this application further protects the kinematic pair of the screw transmission component formed by the transmission component proposed in this application. For the specific structure of the transmission component, please refer to the content of the above embodiment. The screw 2 is provided with a threaded structure 20, and the threaded structure 20 has a first helical surface 201 and a second helical surface 202. In this embodiment, the first helical surface 201 can be the upper edge surface of the threaded structure 20, and the second helical surface 202 can be the lower edge surface of the threaded structure 20. When the first and second rotating shaft groups in the transmission mechanism 3 are clamped against the threaded structure 20, the rotating shaft components in the first rotating shaft group and the rotating shaft components in the second rotating shaft group abut on the first and second helical surfaces 201, 202 arranged opposite to each other; and when the first and second rotating shaft groups in the rotating shaft mechanism abut against the threaded structure 20 by supporting, the rotating shaft components in the first rotating shaft group and the rotating shaft components in the second rotating shaft group abut on the first and second helical surfaces 201, 202 arranged opposite to each other.

[0114] Further, refer to Figure 8 and Figure 9 As shown, in some embodiments, the first helical surface 201 and the second helical surface 202 are configured as inclined surfaces gradually approaching each other, for abutting against the roller cone component 32 in the transmission mechanism 3 .

[0115] Specifically, in the technical solution adopted in the present application, the first helical surface 201 and the second helical surface 202 are set as inclined surfaces for the components to approach each other. It can be understood that the cross-section of the threaded structure 20 is trapezoidal to adapt to the conical surface of the roller cone component 32 in the transmission mechanism 3, thereby increasing the contact area between the roller cone component 32 and the threaded structure 20.

[0116] Further, refer to Figure 8 and Figure 9 As shown, in some embodiments, the thread structure 20 on the lead screw 2 is an external thread structure, and the pitch of the external thread structure is larger than the diameter of the roller cone component 32 in the transmission mechanism 3; or,

[0117] The thread structure 20 on the lead screw 2 is an internal thread structure, and the thread groove width of the internal thread structure is larger than the diameter of the roller cone component 32 in the transmission mechanism 3.

[0118] Specifically, in the technical solution adopted in the present application, in order to ensure that the roller cone component 32 contacts only one side of the thread structure 20, the diameter of the thread structure 20 can be set to be larger than the size of the roller cone component 32. Specifically, when the thread structure 20 on the lead screw 2 is an external thread structure, the pitch of the external thread structure is larger than the maximum diameter of the roller cone component 32; and when the thread structure 20 on the lead screw 2 is an internal thread structure, the groove width of the internal thread structure is larger than the maximum diameter of the roller cone component 32. This ensures that when the roller cone component 32 abuts the first helical surface 201, there is a gap between the roller cone component 32 and the second helical surface 202. When the roller cone component 32 abuts the second helical surface 202, there is a gap between the roller cone component 32 and the first helical surface 201. Consequently, when the transmission body 1 and the lead screw 2 rotate relative to each other, the roller cone component 32 contacts only one side of the thread structure 20. After adopting the improved transmission component and screw 2 combined in this application to form a screw transmission component motion pair, not only the internal thread structure on the transmission component and the ball located between the transmission component and the screw 2 are perfectly replaced, but also the processing cost is saved on this basis, and the thrust of the translational movement of the transmission component and the stability of the relative rotation between the transmission component and the screw 2 are improved by reducing unnecessary friction.

[0119] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0120] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0121] Any process or method description in a flow chart or otherwise described herein can be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations in which the functions may be performed in a different order than shown or discussed, including in a substantially simultaneous manner or in a reverse order depending on the functions involved.

[0122] The logic and / or steps represented in the flowchart or otherwise described herein may be considered, for example, as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device).

[0123] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. All or part of the steps of the above embodiment method can be completed by instructing the relevant hardware through a program, which can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0124] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the aforementioned integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium. The storage medium may be a read-only memory, a magnetic disk, or an optical disk, etc.

[0125] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A transmission mechanism, characterized in that: The transmission mechanism is used to convert linear motion and rotational motion into each other, and the transmission mechanism includes: a roller cone component used to be tangent to the helical surface on the screw; The cone roller component has a cone-like surface, and the cone-like surface rolls on the helical surface of the lead screw; There is a tangent point where the cone-like surface is tangent to the spiral surface, and the stroke of the tangent point on the rolling cone component is equal to the trajectory stroke on the spiral surface.

2. The transmission mechanism according to claim 1, characterized in that: The helical surface and the conical surface are tangent to a straight line pointing to the axis of the screw, so that the helical surface and the conical surface are in line contact, and the conical surface and the helical surface remain tangent and perform circumferential rolling; The central axis of the helicoid on the cone-like surface is the Z axis, and a cylindrical coordinate system is established, and the coordinates on the cylindrical coordinate system are (r, θ, z); The equation of the cone-like surface in the cylindrical coordinate system is: Among them, θ∈(0,2π); In this equation, r represents the vertical distance from the tangent point to the center axis of the roller component (i.e., the Z axis); z represents the coordinate value of the point on the Z axis; θ represents the rotation angle; k and r0 are constants, k represents that the roller rolls on the helical surface of the screw, and the roller component rotates k times when the helical surface rotates one circle; r0 represents the initial minimum value of r when z=0. When the roller rolls on the helical surface, the axis of the roller remains perpendicular to the axis of the screw, and r0 is the minimum distance between the axis of the roller and the axis of the helical surface.

3. A transmission component, characterized in that: include: a transmission body, configured to be sleeved on the lead screw; and The transmission mechanism according to claim 1 or 2, wherein the roller cone component is rotatably arranged on the transmission body and is used to abut against the thread structure of the lead screw; When the transmission body and the lead screw rotate relative to each other, the cone roller component rolls on the lead screw along the thread structure, so that the transmission body and the lead screw are relatively displaced.

4. The transmission component according to claim 3, characterized in that: The roller cone component comprises: a first roller cone group and a second roller cone group; The first roller cone group and the second roller cone group are arranged on the transmission body along the helical angle of the thread structure, and form a first acting force on the thread structure.

5. The transmission component according to claim 4, characterized in that: The first roller cone group and the second roller cone group are arranged on the corresponding surfaces of the thread structure in a supporting manner, and the first force is a supporting force.

6. The transmission component according to claim 3, characterized in that: The side wall of the transmission body is provided with a plurality of mounting holes along the spiral angle of the threaded structure; The cone roller component is rotatably mounted in the corresponding mounting hole.

7. The transmission component according to claim 6, characterized in that: The transmission mechanism further comprises: A bearing component is installed in the corresponding mounting hole; The cone roller component is rotatably mounted in the corresponding mounting hole through the bearing component, and the cone roller component extends out of the mounting hole to the inner side of the transmission body so as to abut against the thread structure of the lead screw.

8. The transmission component according to claim 4, characterized in that: A plurality of first mounting holes and a plurality of second mounting holes are formed on the side wall of the transmission body along the helical angle of the threaded structure. The first mounting holes and the second mounting holes are arranged in layers along the axial direction of the transmission body. The first roller cone group is disposed in each of the first mounting holes, and the second roller cone group is disposed in each of the second mounting holes. The transmission mechanism further comprises: A bearing component is installed in the first mounting hole or the second mounting hole; The cone roller component is rotatably connected to the bearing component, and the cone roller component extends from the corresponding first mounting hole or the corresponding second mounting hole to the inner side of the transmission body so as to abut against the threaded structure of the lead screw.

9. The transmission component according to claim 7 or 8, characterized in that: The roller cone component has a mounting portion and an abutment portion. The mounting portion can be rotatably embedded in the bearing component. The abutment portion extends toward the center of the transmission body and has a conical structure that gradually shrinks from the bearing component toward the center of the transmission body.

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