Gear transmission device with flexible hinge

Abstract

The utility model discloses a gear transmission device with a flexible hinge, which comprises a gear box and at least two groups of meshed gear components, each gear component is rotatably connected in the gear box, one end of each gear component extends out of the gear box, and the other end of each gear component extends out of the gear box. The two ends of each gear assembly are each provided with a flexible hinge used for reducing the errors of the shaft crossed angle and the shaft staggered angle in the assembling process. According to the utility model, the flexible hinges are arranged at the two ends of the gear assembly, so that the assembly error can be reduced through the flexible hinges when the gear assembly is meshed.

Description

Technical Field

[0001] The utility model relates to the technical field of gear transmission, and more specifically, to a gear transmission device with a flexible hinge. Background Art

[0002] In the gear device, the deviation in position, geometry or angle between gears caused by various factors in the manufacturing and assembly process is called gear assembly error. Gear assembly error is mainly caused by the following aspects: 1. Parts error: manufacturing error of parts and additional error caused by deformation and wear after operation. 2. Tool and measuring tool error: tools and measuring tools have manufacturing errors. When they are used for measurement and positioning, system errors will occur. 3. Operation error: due to the feel (such as tightness, flushness, sharpness, smoothness, jumping, shaking, vibration, spacing, wrench force, hand knocking, hand pulling gap, loose feel, etc.), visual inspection (size, level, straightness, verticality, parallelism, alignment, tangency, etc.), listening (various abnormal sounds), smelling (leakage, etc.), errors caused by human sensory identification. 4. Environmental error: errors caused by temperature, relative humidity, light direction, air flow, foundation movement, etc.

[0003] Gear assembly errors may have the following effects on the gear transmission system:

[0004] 1. Reduced motion accuracy: Gear assembly errors can cause changes in the axial, radial or oblique clearance when the gears are meshing, thereby affecting the motion accuracy of the transmission system. Especially for applications with high precision requirements, such as machine tools and precision instruments, gear assembly errors may cause the system to be unable to achieve the accuracy level required by the design.

[0005] 2. Increased noise and vibration: Gear assembly errors will lead to increased impact and vibration when the gears mesh, causing noise and vibration problems in the transmission system. This not only causes discomfort to the user, but may also accelerate the wear of gears and bearings and shorten their service life.

[0006] 3. Increased power loss: In the gear transmission system, gear assembly errors will lead to a decrease in the overlap of the meshing tooth surfaces, thereby increasing friction losses and reducing transmission efficiency. This means that more energy will be converted into heat rather than transferred to the load, resulting in increased power loss.

[0007] 4. Reduced bearing life: Gear assembly errors can lead to uneven load distribution on the bearings, causing some bearings to bear greater loads, thus reducing their service life. In addition, errors can also lead to increased bearing vibration, further reducing their life.

[0008] Assembly error: Due to assembly information technology and assembly design methods, the contact at one end or the linear deviation of the gear shaft will cause uneven load bearing capacity of different gears, resulting in excessive load on individual gear teeth, causing local early wear, and even no gear tooth breakage in severe cases. Gear imbalance will cause huge impact vibration and noise. The assembly error of gears is mainly reflected in: axial error, center distance error (radial error), axis angle error and axis stagger angle error. Utility Model Content

[0009] In order to solve the above problems, the utility model proposes a gear transmission device with a flexible hinge. By arranging flexible hinges at both ends of the gear assembly, the gear assembly error, including the shaft angle error and the shaft staggered angle error, can be effectively reduced, which is beneficial to the precise transmission of the gear assembly and can also improve the working efficiency of the gear assembly.

[0010] To achieve the above-mentioned purpose, the technical solution of the utility model is: a gear transmission device with a flexible hinge, comprising a gear box and at least two groups of meshing gear assemblies, each of the gear assemblies is rotatably connected in the gear box and one end of the gear assembly extends out of the gear box, and both ends of each gear assembly are respectively provided with a flexible hinge for reducing the errors of the axis intersection angle and the axis staggered angle during assembly.

[0011] In the present technical solution, flexible hinges are arranged at both ends of the gear assembly. The flexible hinges can undergo elastic deformation to compensate for the axis angle error and the assembly error of the axis staggered angle. When the gear assembly stops working, the flexible hinge returns to its initial state. The flexible hinge makes the gear assembly have a certain elasticity, so that it can filter part of the impact and vibration, which is beneficial to the precise transmission of the gear assembly, and can also improve the working efficiency of the gear assembly, increase the service life of the gear assembly, improve the lubrication of the gear assembly, and reduce vibration noise.

[0012] As a preferred solution, each group of the gear assemblies includes a gear shaft, a gear and two bearings, the gears of adjacent gear assemblies are meshed, the gears are sleeved on the gear shaft and connected by a key, the two bearings are respectively installed in the gear box and sleeved on the two ends of the gear shaft, the flexible hinges are arranged at the two ends of the gear shaft in the gear box, the gears and the gear shaft are connected by a key to facilitate the disassembly of the gears, thereby making the maintenance of the gears more convenient, the flexible hinges can make the gear shaft slightly deformed to reduce assembly errors, which is beneficial to the precise transmission of the gears, but when the load is large, the flexible hinge on the gear shaft is broken and stops rotating in time, thereby protecting the gears from overload.

[0013] As a preferred solution, at least one group of notch structures are respectively provided at both ends of the gear shaft located between the two bearings, and the notch structures form the flexible hinge. The notch structures include two semi-circular notches on the same plane, and the two semi-circular notches are arranged along the circumferential surface of the gear shaft and are symmetrical about the axis of the gear shaft. A group of notch structures can make the two ends of the gear shaft bend in two directions, and the bending is an elastic deformation, which can compensate for the shaft angle error and the assembly error of the shaft staggered angle.

[0014] As a preferred solution, two groups of notch structures are respectively provided at both ends of the gear shaft, each group of notch structures are parallel and adjacent notch structures are staggered and spaced apart, wherein the staggered arrangement is such that one group of notch structures is arranged along the up and down direction of the gear shaft, and the other group of notch structures is arranged along the left and right direction of the gear shaft. Through the two groups of staggered notch structures, the gear shaft can be bent in more directions, thereby eliminating assembly errors to a greater extent.

[0015] As a preferred embodiment, the gear shaft includes a first shaft section and a second shaft section, the first shaft section and the second shaft section are coaxially connected and one end of the first shaft section extends out of the gear box, shoulders are respectively provided at both ends of the second shaft section, the bearing is sleeved on the shoulders, the second shaft section is used to install the gear, the first shaft section is arranged on one of the shoulder end faces, a flexible hinge is arranged on the second shaft section close to the shoulder, and the first shaft section is used as an output shaft or an input shaft.

[0016] As a preferred solution, a sleeve is provided on the shaft shoulder, one end of the sleeve abuts against the bearing, and the other end of the sleeve abuts against the gear. The sleeve is used to limit the axial position of the gear, which is beneficial to the precise transmission of the gear and improves the working efficiency of the gear.

[0017] As a preferred solution, the gear assembly is provided with two groups, the gears of one group of the gear assemblies are left-handed gears, and the gears of the other group of the gear assemblies are right-handed gears, the left-handed gears and the right-handed gears are meshed with each other, the gears of one group of the gear assemblies serve as driving gears, and the gears of the other group of the gear assemblies serve as driven gears, the driving gear and the driven gear have opposite rotation directions, and the two are meshed based on spatial conjugate curves, and continuous and stable point contact meshing transmission is achieved through a pair of spatial conjugate curves, with a small number of teeth and a large transmission ratio.

[0018] As a preferred solution, both the left-handed gear and the right-handed gear have circular arc tooth profile structures to achieve pure rolling transmission with high meshing efficiency.

[0019] As a preferred solution, one end of the gear shaft of one group of the gear assemblies extends out of one end face of the gear box, and one end of the gear shaft of another group of the gear assemblies extends out of the other end face of the gear box. One end of the two gear shafts extends out from both sides of the gear box respectively, which is suitable for front and rear transmission.

[0020] As a preferred solution, in order to allow the gear shaft to pass through the gear box, the gear box includes an upper box body and a lower box body that are interlocked with each other, and a through hole for installing the bearing is provided at the connection between the upper box body and the lower box body. One end of the gear shaft passes through the gear box through the through hole, and an end cover is provided on the through hole.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] 1. The utility model provides flexible hinges at both ends of the gear assembly, and the elastic deformation generated by the flexible hinges can compensate for the shaft angle error and the assembly error of the shaft staggered angle.

[0023] 2. The flexible hinge can provide compensation for the gear assembly during rotation, which is beneficial to the precise transmission of the gear assembly and improves the working efficiency of the gear assembly.

[0024] 3. Reduce the impact and vibration of the gear assembly during operation through the flexible hinge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a gear transmission device with a flexible hinge of the utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure after assembly;

[0027] Figure 3 yes Figure 2 Schematic diagram of the structure of the hidden upper box;

[0028] Figure 4 It is a schematic diagram of the structure of the gear shaft;

[0029] Figure 5 yes Figure 4 Schematic diagram from another perspective.

[0030] In the figure: upper box body 1; lower box body 2; through hole 3; end cover 4; gear shaft 5; first shaft section 501; second shaft section 502; flexible hinge 503; key 504; shoulder 505; left-handed gear 6; left-handed gear keyway 601; right-handed gear 7; right-handed gear keyway 701; bearing 8; sleeve 9. DETAILED DESCRIPTION

[0031] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the 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 may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0032] 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", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are 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 orientation, be constructed and operated in a specific orientation. 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.

[0033] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0034] Embodiment 1:

[0035] like Figures 1 to 5 As shown, this embodiment provides a gear transmission device with a flexible hinge, including a gear box and at least two groups of meshing gear assemblies, each of the gear assemblies is rotatably connected in the gear box and one end of the gear assembly extends out of the gear box, and both ends of each gear assembly are respectively provided with a flexible hinge 503 for reducing the axis intersection angle and axis staggered angle errors during assembly.

[0036] In this embodiment, one group of gear assemblies is active and the other group of gear assemblies is driven. During the assembly process of the gear assemblies, axial errors, center distance errors (radial errors), shaft angle errors and shaft staggered angle errors may occur. The gear assemblies may be composed of ordinary gear pairs or linear gear pairs. As for linear gear pairs, they are not sensitive to axial errors and center distance errors, but their transmission performance is significantly affected by shaft angle errors and shaft staggered angle errors, but is basically not affected by axial errors and center distance errors. By arranging flexible hinges 503 at both ends of the gear assembly, the shaft angle errors and shaft staggered angle errors can be reduced.

[0037] Specifically, the two groups of gear assemblies include a gear shaft 5, a gear and two bearings 8, the left and right gears are meshed with each other, one of the gears is a left-handed gear 6, and the other gear is a right-handed gear 7. Keys 504 are respectively provided on the two gear shafts 5. The left-handed gear 6 is provided with a left-handed gear keyway 601 adapted to the key 504 of one of the gear shafts 5, and the right-handed gear 7 is provided with a right-handed gear keyway 701 adapted to the key 504 of the other gear shaft 5. The bearings 8 are installed in the gear box and sleeved on both ends of the gear shaft 5. The flexible hinges 503 are provided at both ends of the gear shaft 5 in the gear box. Lubricating oil is applied between the left-handed gear 6 and the right-handed gear 7 to increase their meshing efficiency.

[0038] In this embodiment, the linear gear is flexibly designed. The two gear shafts 5 can be arranged in parallel to form parallel axis gears, and the two gear shafts 5 can be arranged non-parallel to form staggered axis gears. The most important feature of the linear gear is point contact transmission, a small number of teeth, and a large transmission ratio. Different from ordinary gears designed based on the conjugate surface meshing theory, the design of the linear gear is the spatial conjugate curve meshing theory.

[0039] Specifically, the left-handed gear 6 and the right-handed gear 7 both have circular arc tooth profile structures.

[0040] In this embodiment, the arc tooth profile structure can realize pure rolling transmission, and the meshing efficiency can reach 99.4% under non-lubricating conditions.

[0041] Specifically, the gear shaft 5 includes a first shaft segment 501 and a second shaft segment 502, the first shaft segment 501 and the second shaft segment 502 are coaxially connected and one end of the first shaft segment 501 extends out of the gear box, and shoulders 505 are respectively provided at both ends of the second shaft segment 502, and the bearing 8 is sleeved on the shoulders 505.

[0042] In this embodiment, the flexible hinge 503 is disposed on the second shaft segment 502 .

[0043] Specifically, at least one set of notch structures are respectively provided at both ends of the gear shaft 5 located between the two bearings 8, and the notch structures form the flexible hinge 503. The notch structures include two semi-circular notches on the same plane, and the two semi-circular notches are arranged along the circumferential surface of the gear shaft 5 and are symmetrical about the axis of the gear shaft 5.

[0044] In this embodiment, the notch structure allows the gear shaft 5 to produce an elastic deformation with a maximum deformable angle of about 8°, so the maximum adjustable shaft intersection angle or staggered angle is an assembly error of 8°.

[0045] Specifically, the first shaft section 501 of the gear shaft 5 of one group of the gear assemblies extends out of one end surface of the gear box, and the first shaft section 501 of the gear shaft 5 of another group of the gear assemblies extends out of the other end surface of the gear box.

[0046] In this embodiment, the first shaft sections 501 of the two gear shafts 5 extend from both sides of the gear box respectively, wherein one first shaft section 501 serves as a driving shaft and the other first shaft section 501 serves as a driven shaft to achieve sequential transmission.

[0047] Specifically, Figure 2 As shown, the gear box includes an upper box body 1 and a lower box body 2 that are interlocked with each other, and a through hole 3 for installing the bearing 8 is provided at the connection between the upper box body 1 and the lower box body 2. One end of the gear shaft 5 passes through the gear box through the through hole 3, and an end cover 4 is provided on the through hole 3.

[0048] In this embodiment, the upper box body 1 and the lower box body 2 are fixed by bolts, the end cover 4 is provided with an opening for the first shaft section 501 to pass through, and the end cover 4 is fixed to the through hole 3 by four bolts distributed in a circumferential array.

[0049] Embodiment 2:

[0050] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 4 , 5 As shown, two groups of the notch structures are respectively provided at both ends of the gear shaft 5, and each group of the notch structures is parallel and adjacent notch structures are staggered and spaced apart.

[0051] In this embodiment, two groups of notch structures can enable the gear shaft 5 to bend at multiple angles to produce elastic deformation, thereby reducing assembly errors and reducing vibration and impact to a greater extent. The notch structures can also be more than two groups.

[0052] Embodiment 3:

[0053] This embodiment is similar to the embodiment 1, except that, in this embodiment, a shaft sleeve 9 is provided on the shaft shoulder 505, one end of the shaft sleeve 9 abuts against the bearing 8, and the other end of the shaft sleeve 9 abuts against the gear.

[0054] In this embodiment, the shaft sleeve 9 is sleeved on the second shaft segment 502 and covers the outer periphery of the flexible hinge 503 , and the shaft sleeve 9 is used to limit the axial position of the gear.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A gear transmission device with a flexible hinge, comprising a gear box and at least two sets of meshing gear assemblies, each of the gear assemblies is rotatably connected to the gear box and one end of the gear assembly extends out of the gear box, characterized in that: Each of the two ends of the gear assembly is provided with a flexible hinge (503) for reducing the axis intersection angle and the axis staggered angle error during assembly. Each group of the gear assemblies comprises a gear shaft (5), a gear and two bearings (8). The gears of adjacent gear assemblies are meshed with each other. The gear is sleeved on the gear shaft (5) and connected by a key (504). The two bearings (8) are respectively installed in the gear box and sleeved on the two ends of the gear shaft (5). The flexible hinge (503) is provided at the two ends of the gear shaft (5) in the gear box. At least one group of notch structures are provided at the two ends of the gear shaft (5) located between the two bearings (8). The notch structure forms the flexible hinge (503). The notch structure comprises two semicircular notches on the same plane. The two semicircular notches are provided along the circumferential surface of the gear shaft (5) and are symmetrical about the axis of the gear shaft (5).

2. A gear transmission device with a flexible hinge according to claim 1, characterized in that: Two groups of notch structures are respectively provided at both ends of the gear shaft (5); each group of notch structures is parallel and adjacent notch structures are staggered and spaced apart.

3. A gear transmission device with a flexible hinge according to claim 1, characterized in that: The gear shaft (5) comprises a first shaft section (501) and a second shaft section (502), wherein the first shaft section (501) and the second shaft section (502) are coaxially connected and one end of the first shaft section (501) extends out of the gear box, and shaft shoulders (505) are respectively provided at both ends of the second shaft section (502), and the bearing (8) is sleeved on the shaft shoulders (505).

4. A gear transmission device with a flexible hinge according to claim 3, characterized in that: A shaft sleeve (9) is provided on the shaft shoulder (505), one end of the shaft sleeve (9) abuts against the bearing (8), and the other end of the shaft sleeve (9) abuts against the gear.

5. A gear transmission device with a flexible hinge according to any one of claims 1 to 4, characterized in that: The gear assembly is provided with two groups, the gears of one group of the gear assembly are left-handed gears (6), and the gears of the other group of the gear assembly are right-handed gears (7), and the left-handed gears (6) and the right-handed gears (7) are meshed with each other.

6. A gear transmission device with a flexible hinge according to claim 5, characterized in that: The left-handed gear (6) and the right-handed gear (7) both have circular arc tooth profile structures.

7. A gear transmission device with a flexible hinge according to claim 5, characterized in that: One end of the gear shaft (5) of one group of gear assemblies extends out of one end surface of the gear box, and one end of the gear shaft (5) of another group of gear assemblies extends out of the other end surface of the gear box.

8. A gear transmission device with a flexible hinge according to claim 7, characterized in that: The gear box comprises an upper box body (1) and a lower box body (2) which are interlocked with each other, a through hole (3) for mounting the bearing (8) is provided at the connection between the upper box body (1) and the lower box body (2), one end of the gear shaft (5) passes through the through hole (3) and out of the gear box, and an end cover (4) is provided on the through hole (3).

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