Sectional type linear gear device

Abstract

The invention relates to the technical field of transmissions, in particular to a sectional type linear gear device which comprises a driving linear gear module and a driven linear gear module, and the driving linear gear module and the driven linear gear module are the same in structure and each comprise a gear shaft, a gear body rotationally connected with the gear shaft and elastic linear teeth arranged on the gear body. A plurality of sets of gear bodies are arranged on the gear shaft, positioning pieces used for fixing the relative positions of the gear bodies and the gear shaft are arranged on the gear bodies, and meshing curves of the elastic linear teeth are space conjugate curves. The stepless speed change device is simple in structure, stable in transmission, small in size, capable of meeting the requirement for light weight and suitable for stepless speed change in the field of low-power transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and more particularly to a segmented linear gear device. Background Art

[0002] The transmission is a device used to change the transmission ratio and achieve different speed and torque transmission. It plays an important role in the field of mechanical engineering. According to whether the transmission can continuously change its transmission ratio within a range, the transmission can be divided into stepped transmission and continuously variable transmission. The transmission ratio of the continuously variable transmission can change smoothly within the range, the transmission process is stable, and the transmission ratio is precise.

[0003] In the prior art, Chinese patent CN102278431A discloses a friction planetary continuously variable transmission, which includes a V-shaped center wheel, a planetary carrier and a planetary gear set, and a transmission element engaged with multiple planetary gear sets to transmit power; between the V-shaped center wheel, the planetary carrier and the transmission element, any one is used as an input element, any one of the other two is used as an output element, and the last one is used as a fixed element. By adjusting the V-shaped center wheel, the friction planetary gear rotates around the primary planetary gear to change the contact radius between the V-shaped center wheel and the friction planetary gear, thereby achieving continuously variable speed change. However, the transmission is large in size and complex in structure, and cannot be lightweight, so it is not suitable for the field of small-power transmission with speed change requirements. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, such as large size, complex structure and inability to achieve lightweight, and to provide a segmented linear gear device with adjustable speed change rules, simple structure, smooth transmission, small size, meeting lightweight requirements, and suitable for the field of low-power transmission.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A segmented linear gear device is provided, comprising a driving linear gear module and a driven linear gear module. The driving linear gear module and the driven linear gear module have the same structure, both comprising a gear shaft, a gear wheel body rotatably connected to the gear shaft, and elastic linear teeth arranged on the gear wheel body. The gear wheel body is provided with multiple groups on the gear shaft, and the gear wheel body is provided with a positioning piece for fixing the relative position of the gear wheel body and the gear shaft. The meshing curve of the elastic linear teeth is a spatial conjugate curve.

[0007] The segmented linear gear device of the present invention comprises the following steps: firstly, a plurality of gear wheel bodies are installed on the gear shaft, and then the elastic linear teeth are fixed on the gear wheel bodies to form a driving linear gear module and a driven linear gear module, and then the elastic linear teeth on the driving linear gear module and the driven linear gear module are meshed with each other, and the meshing curves between the elastic linear teeth satisfy the spatial conjugate curve relationship, that is, a point correspondence can be established between the two curves, so that the two curves have a common principal normal at the corresponding point, which is a conjugate curve. During the transmission process, the elastic linear teeth always maintain point contact meshing, and the transmission process is stable; when it is necessary to adjust the instantaneous speed ratio or change the speed change law, the plurality of gear wheel bodies can rotate independently, thereby adjusting the position of the elastic linear teeth, obtaining the set transmission ratio change law, changing the instantaneous transmission ratio, and finally fixing the relative position between the plurality of gear wheel bodies and the gear shaft by the positioning member to ensure stable transmission. The segmented linear gear device of the present invention adopts a segmented gear wheel body structure, which is convenient for directly rotating to adjust its own position, driving the elastic linear teeth to change, and simply and quickly completing the change of instantaneous transmission ratio; point contact engagement is performed through spatial conjugate curves, and the transmission process is smooth; the number of parts is small and the structural size is small, which meets the lightweight requirements and is suitable for the field of low-power transmission, especially small electromechanical products with speed change requirements.

[0008] Furthermore, the elastic wire teeth are all spiral-shaped. When the spiral elastic wire teeth rotate with the gear wheel body, the pitch between the positions of the elastic wire teeth can be adjusted, thereby changing the instantaneous transmission ratio in the transmission process and obtaining the required speed change law, which is suitable for the situation where the speed change law needs to be adjusted, and the spiral elastic wire teeth have continuity when deforming, which can ensure that the change of the instantaneous transmission ratio is uniform without impact and mutation.

[0009] Furthermore, the elastic wire teeth each include a movable portion and a fixed portion disposed at both ends of the movable portion, and the fixed portion is provided with a fixing piece connected to the gear wheel body. The fixing portion fixes the elastic wire teeth on the gear wheel body through the fixing piece, and during the transmission process, the gear wheel body is rotated to cause the movable portion to undergo elastic deformation, thereby adjusting the instantaneous transmission ratio.

[0010] Furthermore, the elastic wire teeth are provided with an elastic part for ensuring that the axial length of the elastic wire teeth along the gear shaft remains unchanged, and the elastic part is arranged between the movable part and the fixed part. The elastic part can ensure that the axial length of the wire gear on the entire gear remains unchanged during the deformation process of the wire teeth, thereby ensuring that the meshing position of the elastic wire teeth remains unchanged, thereby ensuring that the average transmission ratio of the wire gear device does not change, and ensuring that the entire gear pair can transmit continuously and stably;

[0011] Furthermore, the elastic part is S-shaped, one end of which is connected to the movable part, and the other end of which is connected to the fixed part. The S-shaped elastic part has a thinner wall thickness and a larger elastic deformation degree, and can provide a stable elastic deformation effect, ensuring that the length of the elastic wire tooth in the axial direction of the gear remains unchanged, so that the average transmission ratio remains stable.

[0012] Furthermore, the gear wheel body is provided with a group of mounting holes, and the mounting holes are provided with a clamping assembly for fixing the position of the elastic wire teeth. The gear wheel body is provided with a group of mounting holes, and the mounting holes are provided with a clamping assembly, which is responsible for clamping and fixing the elastic wire teeth. The clamping assembly can rotate with the gear wheel body, thereby driving the elastic wire teeth to undergo elastic torsion, so that the speed change law between the elastic wire teeth can be adjusted arbitrarily, and at the same time ensure that the position of a certain section of the elastic wire teeth relative to the mounting hole does not deviate during the transmission process.

[0013] Furthermore, the clamping assembly is a wire tooth positioning block, the wire tooth positioning block is fixedly connected to the mounting hole, and a connecting portion that cooperates with the elastic wire tooth is provided on the wire tooth positioning block. One end of the wire tooth positioning block is fixedly connected to the mounting hole, and the other end cooperates with the elastic wire tooth through the connecting portion to fix the relative position between a certain section of the elastic wire tooth and the gear wheel body.

[0014] Furthermore, the gear wheel body is provided with a group of positioning holes, the positioning member is arranged in the positioning holes, and the positioning member passes through the gear wheel body and abuts against the gear shaft. The positioning member is arranged in the positioning hole and passes through the gear wheel body and abuts against the gear shaft, which can ensure that the gear wheel body will not rotate on the gear shaft during the transmission process in the case of low power and low load, thereby improving the working stability of the linear gear device.

[0015] Furthermore, it also includes a gear box, the driving line gear module and the driven line gear module are both rotatably connected to the gear box, and the gear shaft partially protrudes from the gear box. The driving line gear module and the driven line gear module are both arranged in the gear box, and the gear box protects the internal structure of the driving line gear module and the driven line gear module to prevent foreign matter from entering.

[0016] Furthermore, the gear housing is provided with a bearing, and the gear shaft is rotatably connected to the bearing. The inner ring of the bearing is arranged on the gear shaft, and the outer ring of the bearing is arranged on the gear housing, which has a strong load-bearing capacity and a low friction coefficient, and can increase the service life of the segmented gear device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Simple structure, stable transmission, small size, in line with lightweight requirements, can achieve stepless speed change in the field of low-power transmission;

[0019] 2. The instantaneous transmission ratio of the linear gear device can be adjusted, thereby changing the overall speed change law;

[0020] 3. The segmented gear wheel structure is adopted, which is convenient for direct rotation to adjust its own position and quick for disassembly and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the segmented linear gear device;

[0022] Figure 2 It is a schematic diagram of a segmented linear gear device from a top view;

[0023] Figure 3 It is a structural schematic diagram of the driven line gear module;

[0024] Figure 4 It is a schematic diagram of the structure of the elastic wire tooth;

[0025] Figure 5 It is a schematic diagram of the structure of the gear wheel body;

[0026] Figure 6 This is a schematic diagram of the structure of the wire tooth positioning block.

[0027] In the accompanying drawings: 100, active line gear module; 110, gear shaft; 120, gear wheel body; 121, mounting hole; 122, line tooth positioning block; 123, connecting part; 124, positioning piece; 125, positioning hole; 130, elastic line tooth; 131, fixing part; 132, movable part; 133, elastic part; 134, fixing piece; 200, driven line gear module; 300, gear box body; 310, bearing. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] The present embodiment is the first embodiment of the segmented linear gear device, including a driving linear gear module 100 and a driven linear gear module 200. The driving linear gear module 100 and the driven linear gear module 200 have the same structure, both including a gear shaft 110, a gear wheel body 120 rotatably connected to the gear shaft 110, and elastic linear teeth 130 arranged on the gear wheel body 120. The gear wheel body 120 is provided with multiple groups on the gear shaft 110, and the gear wheel body 120 is provided with a positioning member 124 for fixing the relative position of the gear wheel body 120 and the gear shaft 110. The meshing curve of the elastic linear teeth 130 is a spatial conjugate curve.

[0032] In this embodiment, the active linear gear module 100 and the driven linear gear module 200 are point-contacted and meshed through a pair of elastic linear teeth 130, and the elastic linear teeth 130 satisfy a spatial conjugate curve relationship, thereby achieving stable transmission. The elastic linear teeth 130 can be elastically deformed, thereby changing the instantaneous transmission ratio between the linear gears. Figure 1 , Figure 2As shown, in the process of adjusting the transmission ratio, first remove the linear gear module to be adjusted, rotate the multi-group segmented gear wheel body 120 installed on the gear shaft 110, so that it rotates around the gear shaft 110 by a certain angle. The rotation angle can be determined by calculating the required transmission ratio law value, and the elastic linear teeth 130 will deform following the rotational movement of the gear wheel body 120. Finally, the relative position of the gear wheel body 120 and the gear shaft 110 is fixed by the positioning member 124, and a segmented gear transmission device that can change the speed change law can be obtained. The elastic linear teeth 130 can also reduce vibration and impact during the transmission process and improve the stability of the transmission process. The segmented linear gear device assembly in this embodiment is easy to process and can be manufactured by ordinary machining. The elastic linear teeth 130 can be replaced at any time for easy maintenance; there is no root cutting during operation, and there is no need to worry about interference between gear teeth during the transmission process. The segmented linear gear device in this embodiment has a simple structure, smooth transmission, and small size, meets the lightweight requirements, can realize stepless speed change in the field of small power transmission, and the instantaneous transmission ratio is adjustable, and the overall speed change law can be adjusted according to needs.

[0033] The elastic wire teeth 130 are all spiral-shaped. Figure 3 , Figure 4 As shown, the elastic wire teeth 130 are spirally arranged on multiple groups of gear wheel bodies 120. In the initial state, the pitches of the various parts of the elastic wire teeth 130 are equal. When the speed change rule needs to be adjusted, the elastic wire teeth 130 are deformed by rotating the gear wheel body 120, and the pitch on the elastic wire teeth 130 can be changed to adjust the instantaneous transmission ratio. Taking a group of elastic wire teeth 130 with an initial pitch of 200mm in each part as an example, the active wire teeth and the driven wire teeth do not deform. At this time, the average transmission ratio of the device is equal to 1, and its instantaneous transmission ratio is also equal to 1. Then adjust the driven wire teeth so that the pitch when it enters the meshing position is 100mm, and the pitch when it rotates to the middle position is 300mm. At this time, the average transmission ratio of the device is 1, and the change rule of the instantaneous transmission ratio is changed as follows: first, the transmission ratio is 0.5, transitions to 1.5 at the middle position, and then transitions to 0.5, and the speed change transmission is carried out according to this periodic rule: 0.5~1.5~0.5. Then the initial pitch of the driven wire tooth can be adjusted to 200mm, the middle pitch to 100mm, and the terminal pitch to 400mm, and then the instantaneous transmission ratio of the device changes periodically according to the rule of 1 to 0.5 to 2 to 1. The spiral elastic wire tooth 130 has continuity during deformation, and the instantaneous transmission ratio changes smoothly and smoothly, which can ensure that the change of the instantaneous transmission ratio is uniform without impact and mutation.

[0034] The elastic wire teeth 130 each include a movable portion 132 and fixed portions 131 disposed at both ends of the movable portion 132. The fixed portion 131 is provided with a fixing member 134 for fixing to the gear wheel body 120. Figure 4As shown, the elastic wire tooth 130 in this embodiment is provided with a fixing part 131 at both ends of the movable part 132, and a fixing piece 134 is provided on the fixing part 131. The fixing piece 134 can be a long screw. The elastic wire tooth 130 is installed on the gear wheel body 120 through the threaded connection between the long screw and the gear wheel body 120. When the gear wheel body 120 is rotated, the relative position between the fixing part 131 and the gear wheel body 120 remains unchanged, and the movable part 132 is deformed to change the transmission ratio.

[0035] The elastic wire teeth 130 are provided with an elastic portion 133 for ensuring that the axial length of the elastic wire teeth 130 along the gear shaft 110 remains unchanged, and the elastic portion 133 is arranged between the movable portion 132 and the fixed portion 131. The elastic portion 133 connects the movable portion 132 and the fixed portion 131. When the transmission ratio needs to be adjusted to deform the elastic wire teeth 130 in the circumferential direction of the gear and change the pitch, the elastic portion 133 also deforms to ensure that the length of the elastic wire teeth 130 in the axial direction of the gear module remains unchanged, thereby ensuring that the average transmission ratio of the wire gear does not change, and ensuring that the entire gear pair can be continuously and stably transmitted.

[0036] The elastic portion 133 is S-shaped, with one end connected to the movable portion 132 and the other end connected to the fixed portion 131. Figure 4 As shown, the S-shaped elastic portion 133 is a thin-walled curved structure with a large degree of deformability. When the elastic wire tooth 130 is deformed, stable elastic deformation can occur to compensate, ensuring that the length of the elastic wire tooth 130 upward on the gear shaft 110 remains unchanged, so that the average transmission ratio remains stable.

[0037] The working principle of the segmented linear gear device in this embodiment is as follows: first, the active linear gear module 100 and the driven linear gear module 200 are maintained in stable point contact and meshing. When speed change is required, the linear gear module to be adjusted is removed, and then the gear wheel body 120 is rotated to rotate around the gear shaft 110. The elastic linear teeth 130 follow the rotational movement of the gear wheel body 120, and the movable part 132 is deformed to change the instantaneous transmission ratio. The elastic part 133 is deformed to ensure that the average transmission ratio remains unchanged, thereby achieving smooth transmission, small size, and stepless speed change that meets lightweight requirements.

[0038] Embodiment 2

[0039] This embodiment is the second embodiment of the segmented linear gear device. This embodiment is similar to the first embodiment, except that a group of mounting holes 121 are provided on the gear wheel body 120, and a clamping assembly for fixing the position of the elastic linear teeth 130 is provided in the mounting holes 121. Figure 5As shown, a group of mounting holes 121 for mounting a clamping assembly are provided on the surface of the gear wheel body 120. The clamping assembly cooperates with the elastic wire tooth 130 to adjust the deformation degree of the elastic wire tooth 130, and fix the movable part 132 of the elastic wire tooth 130 at a corresponding spatial position. Multiple groups of clamping assemblies provide multiple supporting positions for the elastic wire tooth 130 to ensure that the position of the elastic wire tooth 130 is always stable during the transmission process.

[0040] The clamping assembly is a wire tooth positioning block 122, which is fixedly connected to the mounting hole 121. The wire tooth positioning block 122 is provided with a connecting portion 123 that cooperates with the elastic wire tooth 130. Figure 6 As shown, the wire tooth positioning block 122 in this embodiment is provided with a thread at one end, and is fixedly connected to the mounting hole 121 through the thread, and is provided with a connecting portion 123 at the other end. The connecting portion 123 is a groove adapted to the shape of the elastic wire tooth 130, and the movable portion 132 of the elastic wire tooth 130 is clamped in the connecting portion 123 to avoid displacement during the transmission process, which causes unstable speed change rules.

[0041] In this embodiment, the gear wheel body 120 is provided with a group of positioning holes 125, and the positioning members 124 are arranged in the positioning holes 125. The positioning members 124 pass through the gear wheel body 120 and abut against the gear shaft 110. Figure 3 As shown, the positioning member 124 can be a screw, and multiple groups of screws pass through the gear wheel body 120 and abut against the gear shaft 110. In lightweight and low-power transmission situations, it can ensure that the relative position between the gear wheel body 120 and the gear shaft 110 will not change. When the gear wheel body 120 needs to be rotated, the positioning member 124 is first removed. After the gear wheel body 120 is rotated into place, the positioning member 124 is installed into the positioning hole 125 for fixation.

[0042] The working principle of the segmented linear gear device in this embodiment is as follows: a mounting hole 121 and a positioning hole 125 are provided on the gear wheel body 120, a positioning piece 124 for fixing the relative position of the gear wheel body 120 and the gear shaft 110 is provided in the positioning hole 125, and a wire tooth positioning block 122 for fixing the position of the elastic wire tooth 130 is provided in the mounting hole 121. After the wire tooth positioning block 122 is fixedly connected to the mounting hole 121, the elastic wire tooth 130 is installed into the connecting part 123 and finally fastened by the positioning piece 124.

[0043] Embodiment 3

[0044] This embodiment is the third embodiment of the segmented linear gear device. This embodiment is similar to the first embodiment, except that it further includes a gear box 300, the driving linear gear module 100 and the driven linear gear module 200 are both rotatably connected to the gear box 300, and the gear shaft 110 partially protrudes from the gear box 300. Figure 2As shown, the driving line gear module 100 and the driven line gear module 200 are both arranged in the gear box 300, and the gear box 300 protects the internal structures of the driving line gear module 100 and the driven line gear module 200 to prevent foreign matter from entering.

[0045] The gear housing 300 is provided with a bearing 310, and the gear shaft 110 is rotatably connected to the bearing 310. Figure 1 As shown, the inner ring of the bearing 310 is arranged on the gear shaft 110, and the outer ring of the bearing 310 is arranged on the gear box body 300, which has a strong load-bearing capacity and a low friction coefficient, and can improve the service life of the segmented gear device.

[0046] The working principle of the segmented linear gear device in this embodiment is as follows: the driving linear gear module 100 and the driven linear gear module 200 are installed in the gear box 300 by arranging a bearing 310 on the gear box 300 to be rotatably connected with the gear shaft 110 .

[0047] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A segmented linear gear device, characterized in that: The invention comprises a driving line gear module (100) and a driven line gear module (200). The driving line gear module (100) and the driven line gear module (200) have the same structure, and both comprise a gear shaft (110), a gear wheel body (120) rotatably connected to the gear shaft (110), and elastic line teeth (130) arranged on the gear wheel body (120). The gear wheel body (120) is provided with a plurality of groups on the gear shaft (110). The gear wheel body (120) is provided with a positioning member (124) for fixing the relative position of the gear wheel body (120) and the gear shaft (110). The meshing curve of the elastic line teeth (130) is a spatial conjugate curve.

2. The segmented linear gear device according to claim 1, characterized in that: The elastic wire teeth (130) are all in a spiral shape.

3. The segmented linear gear device according to claim 2, characterized in that: The elastic wire teeth (130) each comprise a movable portion (132) and fixed portions (131) arranged at both ends of the movable portion (132), and the fixed portion (131) is provided with a fixing member (134) connected to the gear wheel body (120).

4. The segmented linear gear device according to claim 3, characterized in that: The elastic wire teeth (130) are each provided with an elastic portion (133) for ensuring that the axial length of the elastic wire teeth (130) along the gear shaft (110) remains unchanged, and the elastic portion (133) is arranged between the movable portion (132) and the fixed portion (131).

5. The segmented linear gear device according to claim 4, characterized in that: The elastic portion (133) is S-shaped, with one end connected to the movable portion (132) and the other end connected to the fixed portion (131).

6. The segmented linear gear device according to claim 1, characterized in that: A group of mounting holes (121) are provided on the gear wheel body (120), and a clamping assembly for fixing the position of the elastic wire teeth (130) is provided in the mounting holes (121).

7. The segmented linear gear device according to claim 6, characterized in that: The clamping assembly is a wire tooth positioning block (122), the wire tooth positioning block (122) is fixedly connected to the mounting hole (121), and the wire tooth positioning block (122) is provided with a connecting portion (123) that cooperates with the elastic wire tooth (130).

8. The segmented linear gear device according to claim 6, characterized in that: The gear wheel body (120) is provided with a group of positioning holes (125), the positioning member (124) is arranged in the positioning holes (125), and the positioning member (124) passes through the gear wheel body (120) and abuts against the gear shaft (110).

9. The segmented linear gear device according to any one of claims 1 to 8, characterized in that: It also includes a gear box (300), the driving line gear module (100) and the driven line gear module (200) are both rotatably connected to the gear box (300), and the gear shaft (110) partially protrudes from the gear box (300).

10. The segmented linear gear device according to claim 9, characterized in that: A bearing (310) is provided on the gear housing (300), and the gear shaft (110) is rotatably connected to the bearing (310).

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