Stepless speed change and step transmission type speed changer

Abstract

A stepless speed change pole transmission type speed changer comprises a driving cone pulley assembly, a driven cone pulley assembly and a transmission steel belt, and the driving cone pulley assembly and the driven cone pulley assembly are each formed by coaxially and fixedly connecting a fixed cone pulley and a movable cone pulley assembly and are connected through the steel belt; the movable cone pulley assembly is composed of an internal gear, a movable cone pulley, a partition plate and a cone pulley support, the cone pulley support is a gear shaft fixedly connected with the fixed cone pulley, the internal gear is a cylindrical gear, first internal teeth meshed with the cone pulley support are arranged on the hole wall of a center hole of the internal gear, and the outer side of one end of the internal gear extends in the axial direction to form an oil cylinder. A partition plate with an oil hole is inserted into the oil cylinder, and the other end of the partition plate is connected with the movable cone pulley. The large-torque transmission device has the beneficial effects that the structure is simple and reasonable, the problem of slipping sometimes during large-torque transmission is effectively solved through the mode that the inner gear and the outer gear are meshed, and the functions of smooth gear shifting and smooth large torque are achieved.

Description

Technical Field

[0001] This invention relates to a transmission structure, specifically a continuously variable transmission with stepped transmission. Background Technology

[0002] With the advancement of technology, mechanical transmission equipment is being used in an increasing number of scenarios, such as machining equipment, logistics equipment, industrial machinery, agricultural machinery, and automobiles. During the application of mechanical transmission equipment, people have increasingly higher requirements for the transmission efficiency and smoothness of the transmission structure. Current transmission equipment includes gear transmission, belt transmission, and chain transmission, but none of these transmission structures can simultaneously meet the requirements of high transmission efficiency and smooth transmission. Especially for vehicles, the pursuit of high transmission efficiency while avoiding "jerking" and slippage during high torque transmission is a long-standing goal. Therefore, designing a transmission device that simultaneously meets the requirements of high transmission efficiency and smooth transmission is essential. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a continuously variable transmission with a stepped transmission, which uses a gear hydraulic variable cone pulley to adjust the transmission ratio and a steel belt connection drive transmission to ensure high torque transmission without slippage.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A continuously variable transmission with stepped transmission includes a driving cone wheel assembly, a driven cone wheel assembly, and a transmission steel belt. The driving cone wheel assembly and the driven cone wheel assembly are connected by the transmission steel belt. The driving cone wheel assembly and the driven cone wheel assembly have the same structure, each consisting of a fixed cone wheel and a movable cone wheel assembly. The fixed cone wheel has a conical structure and is coaxially fixed to the movable cone wheel assembly.

[0006] The movable conical wheel assembly consists of an internal gear, a movable conical wheel, a partition plate, and a conical wheel support. The conical wheel support is a gear shaft, the internal gear is a cylindrical gear, and an internal tooth is provided on the wall of the central hole of the internal gear. The internal tooth meshes with the conical wheel support. The outer side of one end of the internal gear extends axially to form a cavity, i.e., a hydraulic cylinder. The partition plate is inserted into the hydraulic cylinder to divide the hydraulic cylinder into a left hydraulic cylinder and a right hydraulic cylinder. Oil holes are provided on the partition plate at the positions corresponding to the left and right hydraulic cylinders, respectively. The other end of the partition plate is connected to the movable conical wheel.

[0007] The movable conical wheel has a frustum structure and a circular groove is opened at the center of one end of the movable conical wheel. There are two internal teeth on the inner wall of the circular groove, which mesh with the external teeth of the internal gear.

[0008] The transmission steel belt is a multi-piece steel belt with internal teeth on its inner side, which can mesh with the driving cone pulley assembly and the driven cone pulley assembly.

[0009] The conical wheel bracket, internal gear, and movable conical wheel have conical end faces corresponding to the fixed conical wheel.

[0010] Furthermore, an oil seal is provided at the connection point between the partition and the oil cylinder.

[0011] Furthermore, the outer diameter of the partition is smaller than the inner diameter of the circular groove, and the end of the partition away from the oil cylinder is fixedly connected to the inner bottom surface of the circular groove.

[0012] Furthermore, the left oil cylinder is connected to the left oil passage, and the right oil cylinder is connected to the right oil passage.

[0013] Beneficial effects

[0014] Compared with the prior art, the beneficial effects of the present invention are: simple structure and reasonable construction. It is an improvement on the existing CVT. By using the meshing of internal and external gears, it effectively solves the problem of slippage that sometimes occurs during high torque transmission, and realizes the functions of smooth shifting and smooth high torque. Attached Figure Description

[0015] Figure 1 This is an exploded view of the present invention;

[0016] Figure 2 This is a schematic diagram of the transmission steel belt contacting the conical surface during the speed change process of this invention;

[0017] Figure 3 A schematic diagram showing the tooth meshing of the transmission steel belt with the driving and driven cone wheel assemblies when the transmission ratio is set in this invention.

[0018] Figure 4 This is a perspective view of the internal gears of the present invention;

[0019] Figure 5 This is a schematic diagram of the connection between the internal gear and the partition plate of the present invention;

[0020] Figure 6 This is a cross-sectional view of the partition and oil seal of the present invention;

[0021] Figure 7 This is a partial enlarged view of the steel conveyor belt of the present invention;

[0022] Figure 8 This is a cross-sectional view of the internal gears of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Driving conical wheel assembly; 2. Driven conical wheel assembly; 3. Transmission steel belt; 4. Fixed conical wheel; 5. Movable conical wheel assembly; 51. Internal gear; 511. Internal gear one; 512. Hydraulic cylinder; 52. Movable conical wheel; 521. Circular groove; 5211. Internal gear two; 53. Partition plate; 531. Oil hole; 54. Conical wheel bracket; 6. Oil seal. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-3 A continuously variable transmission with a stepped transmission includes a driving cone wheel assembly 1, a driven cone wheel assembly 2, and a transmission steel belt 3. The driving cone wheel assembly 1 and the driven cone wheel assembly 2 are connected by the transmission steel belt 3. The driving cone wheel assembly 1 and the driven cone wheel assembly 2 have the same structure, both consisting of a fixed cone wheel 4 and a movable cone wheel assembly 5. The fixed cone wheel 4 has a conical structure and is coaxially fixed to the movable cone wheel assembly 5.

[0026] Please see Figures 4-5 The movable conical wheel assembly 5 consists of an internal gear 51, a movable conical wheel 52, a partition plate 53, and a conical wheel support 54. The conical wheel support 54 is a gear shaft, the internal gear 51 is a cylindrical gear, and an internal tooth 511 is provided on the wall of the central hole of the internal gear 51. The internal tooth 511 meshes with the conical wheel support 54. The outer side of one end of the internal gear 51 extends axially to form a cavity, namely the oil cylinder 512. The partition plate 53 is inserted into the oil cylinder 512 to divide the oil cylinder 512 into a left oil cylinder and a right oil cylinder. Oil holes 531 are provided on the partition plate 53 at the positions corresponding to the left oil cylinder and the right oil cylinder, respectively. The other end of the partition plate 53 is connected to the movable conical wheel 52.

[0027] Please see Figure 1 The movable cone wheel 52 has a frustum structure, and a circular groove 521 is opened at the center of one end of the movable cone wheel 52. The inner wall of the circular groove 521 has an inner tooth 5211, which meshes with the outer tooth of the inner gear 51.

[0028] Please see Figure 7 The transmission steel belt is a multi-piece steel belt with internal teeth on its inner side, which can mesh with the driving cone pulley assembly 1 and the driven cone pulley assembly 2.

[0029] Please see Figure 1The conical wheel bracket 54, the internal gear 51, and the movable conical wheel 52 have conical surfaces corresponding to the end faces of the fixed conical wheel 4.

[0030] Please see Figure 6 As a preferred option, an oil seal 6 is provided at the connection between the partition 53 and the oil cylinder 512.

[0031] Please see Figure 1 As a preferred option, the outer diameter of the partition 53 is smaller than the inner diameter of the circular groove 521, and the end of the partition 53 away from the oil cylinder 512 is fixedly connected to the inner bottom surface of the circular groove 521.

[0032] As a preferred option, the left hydraulic cylinder is connected to the left hydraulic passage, and the right hydraulic cylinder is connected to the right hydraulic passage.

[0033] Working principle:

[0034] Please see Figures 1 to 7 The movable cone wheel assembly 5 is mounted on the cone wheel bracket 4. The partition 53 divides the internal cylinder 512 of the movable cone wheel assembly 5 into a left cylinder and a right cylinder. When the set transmission ratio is reached, the transmission steel belt 3 connects the movable cone wheel assembly 5 of the driving cone wheel assembly 1 and the driven cone wheel assembly 2 through tooth meshing. Reliable transmission is achieved under the cooperation of the fixed cone wheel 3 of the driving cone wheel assembly 1 and the driven cone wheel assembly 2, respectively.

[0035] When a higher transmission ratio is needed to obtain greater torque, the hydraulic pressure of the right cylinder of the active cone wheel assembly 5 of the active cone wheel assembly 1 currently engaged with the transmission steel belt 3 is increased, and the hydraulic pressure of its left cylinder is released. At this time, the active cone wheel assembly of the active cone wheel assembly 1 moves away from its fixed cone wheel, and the transmission steel belt moves towards the center of the active cone wheel assembly 1. At the same time, the hydraulic pressure of the left cylinder of the active cone wheel assembly of the driven active cone wheel assembly 2 currently engaged with the steel belt is increased, and the hydraulic pressure of its right cylinder is released. At this time, the active cone wheel assembly of the driven cone wheel assembly moves closer to its fixed cone wheel, and the transmission steel belt moves towards the edge of the driven cone wheel assembly 2. That is, the transmission ratio increases and the torque increases.

[0036] When a reduction in the transmission ratio is needed to obtain a higher speed, the hydraulic pressure of the left cylinder of the active cone wheel assembly 1, which is currently engaged with the steel belt, is increased, and the hydraulic pressure of its right cylinder is released. This causes the active cone wheel assembly 1 to move closer to its fixed cone wheel, and the transmission steel belt moves towards the edge of the active cone wheel assembly 1. At the same time, the hydraulic pressure of the right cylinder of the driven cone wheel assembly 2, which is currently engaged with the transmission steel belt, is increased, and the hydraulic pressure of the left cylinder of the active cone wheel assembly 2 is released. At this time, the active cone wheel assembly 2 moves away from its fixed cone wheel, and the transmission steel belt moves towards the center of the driven cone wheel assembly 2. That is, the transmission ratio decreases and the speed increases.

[0037] Because during the speed change process, the transmission steel belt 3 is in contact with the conical surface for transmission, such as Figure 7 As shown, this allows for uninterrupted speed change (until entering the next set gear ratio). If more fixed gear ratios are needed, the number of pairs of movable cone gear assemblies can be increased.

[0038] In practical applications, to avoid the right-side hydraulic cylinder being in an open state and affecting the function, such as... Figure 8 As shown, an internal thread can be provided near the outer edge of the right-side cylinder to facilitate the connection of a nut to the end of the right-side cylinder, thereby keeping the right-side cylinder in a closed state.

[0039] The advantages of this invention are:

[0040] 1. It adopts hydraulic transmission and can share a hydraulic powertrain with the existing CVT structure without the need to add a new system, effectively utilizing existing resources and saving costs.

[0041] 2. By adopting a multi-gear meshing method, slippage is avoided when the power transmission increases, effectively solving the problem of slippage that easily occurs in high torque transmission.

[0042] 3. During gear shifting, power transmission is continuous and uninterrupted, avoiding any "jerking" sensation.

[0043] 4. It adopts a telescopic adjustment mechanism to save space.

[0044] 5. In specific applications, by changing the number of sets of movable conical wheel 52 and internal gear 51, multiple fixed speed ratio gears can be achieved.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuously variable transmission (CVT) with stepped transmission, comprising a driving cone pulley assembly (1), a driven cone pulley assembly (2), and a transmission steel belt (3), characterized in that: The active cone wheel assembly (1) and the driven cone wheel assembly (2) are connected by a transmission steel belt (3). The active cone wheel assembly (1) and the driven cone wheel assembly (2) have the same structure, both consisting of a fixed cone wheel (4) and a movable cone wheel assembly (5). The fixed cone wheel (4) has a conical structure and is coaxially fixed to the movable cone wheel assembly (5). The movable conical wheel assembly (5) consists of an internal gear (51), a movable conical wheel (52), a partition plate (53), and a conical wheel support (54). The conical wheel support (54) is a gear shaft, the internal gear (51) is a cylindrical gear, and an internal tooth (511) is provided on the wall of the central hole of the internal gear (51). The internal tooth (511) meshes with the conical wheel support (54). The outer side of one end of the internal gear (51) extends axially to form a cavity, namely a hydraulic cylinder (512). The partition plate (53) is inserted into the hydraulic cylinder (512) to divide the hydraulic cylinder (512) into a left hydraulic cylinder and a right hydraulic cylinder. Oil holes (531) are provided on the partition plate (53) at the positions corresponding to the left and right hydraulic cylinders, respectively. The other end of the partition plate (53) is connected to the movable conical wheel (52). The movable cone wheel (52) has a frustum structure and a circular groove (521) is opened at the center of one end of the movable cone wheel (52). There is an inner tooth (5211) on the inner wall of the circular groove (521), which meshes with the outer tooth of the internal gear (51). The transmission steel belt is a multi-piece steel belt with internal teeth on its inner side, which can mesh with the driving cone pulley assembly (1) and the driven cone pulley assembly (2); The end face of the cone wheel bracket (54), the internal gear (51), and the movable cone wheel (52) corresponding to the fixed cone wheel (4) is a cone surface.

2. The continuously variable transmission with stepped transmission according to claim 1, characterized in that: An oil seal (6) is provided at the connection position between the partition (53) and the oil cylinder (512).

3. A continuously variable transmission with stepped transmission according to claim 1, characterized in that: The outer diameter of the partition (53) is smaller than the inner diameter of the circular groove (521), and the end of the partition (53) away from the oil cylinder (512) is fixedly connected to the inner bottom surface of the circular groove (521).

4. A continuously variable transmission with stepped transmission according to claim 1, characterized in that: The left-side oil cylinder is connected to the left-side oil passage, and the right-side oil cylinder is connected to the right-side oil passage.

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