A kind of cascade continuously variable transmission mechanism

Abstract

The utility model discloses a kind of cascaded continuously variable transmission mechanism, it is related to continuously variable transmission technical field, the cascaded continuously variable transmission mechanism includes driving mechanism, and at least two groups of continuously variable transmission mechanism are connected in turn in sequence, the output end of the continuously variable transmission mechanism located in upper level is drivingly connected with the input end of the continuously variable transmission mechanism located in lower level;The moving direction of the transmission belt of two groups of continuously variable transmission mechanism is same, and driving mechanism is used to drive all transmission belt synchronous movement.By connecting multiple continuously variable transmission mechanism in sequence, the continuously variable transmission mechanism located in the first end of transmission chain is input, the continuously variable transmission mechanism located in the end of transmission chain is output, thus in the case of compressing structure space, greater variable ratio range is realized, shortens transmission stroke, improves transmission efficiency and sensitivity.

Description

Technical Field

[0001] This utility model relates to the field of continuously variable transmission (CVT) technology, and more specifically, to a cascaded CVT mechanism. Background Technology

[0002] CVT (Continuously Variable Transmission) technology uses a drive belt and variable-diameter primary and driven pulleys to transmit power, enabling continuous changes in the transmission ratio and thus achieving optimal matching between the transmission system and engine operating conditions.

[0003] Currently, mainstream continuously variable transmission (CVT) solutions mainly include hard friction transmission on the drive shaft surface (e.g., metal spherical or conical surfaces), variable shaft diameter transmission (e.g., hydraulic-assisted radius expansion and contraction, V-groove extrusion for diameter reduction), and tapered shaft combined with drive belt / cable transmission (including nonlinear solutions). Among these, hard friction and variable shaft diameter solutions have extremely high requirements for the materials and processing technology of the transmission components, and the auxiliary control structures are relatively complex. In contrast, the tapered shaft plus flexible drive belt / cable solution has lower requirements for materials, tolerances and fits, and geometric adaptability, making its design, manufacturing, and system integration more flexible and universal. It also has lower maintenance costs and scalability, making it an important CVT solution.

[0004] However, this approach is limited by its limited deployment space. The angle between the generatrix of the tapered shaft and its own central axis cannot be too large; otherwise, it would be difficult to achieve flexible speed changes, and the transmission cable / belt might not even be able to operate stably within a reasonable working radius. Therefore, to achieve a higher speed ratio within a relatively gentle and appropriate angle range, a longer tapered shaft is required, but a longer tapered shaft would occupy a larger space. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a cascaded continuously variable transmission mechanism.

[0006] The objective of this utility model is achieved through the following technical solution: A cascaded continuously variable transmission (CVT) mechanism includes a drive mechanism and at least two sets of CVT mechanisms connected in series. The output end of the CVT mechanism at the previous stage is connected to the input end of the CVT mechanism at the next stage. The transmission belts of the two sets of CVT mechanisms move in the same direction, and the drive mechanism is used to drive all the transmission belts to move synchronously.

[0007] Furthermore, in this utility model, any of the aforementioned continuously variable transmission (CVT) mechanisms includes an input conical shaft and an output conical shaft connected by a transmission belt; the input conical shaft and the output conical shaft are arranged at intervals, and their central axes are parallel to each other, with the large-diameter end of the input conical shaft and the small-diameter end of the output conical shaft located on the same side; the output conical shaft of the previous stage of the CVT mechanism and the input conical shaft of the next stage of the CVT mechanism are connected by a transmission mechanism, with the large-diameter end of the output conical shaft of the previous stage of the CVT mechanism and the small-diameter end of the input conical shaft of the next stage of the CVT mechanism located on the same side; the aforementioned drive mechanism is used to drive all the aforementioned transmission belts to reciprocate in the direction of the central axis of any of the aforementioned input conical shafts.

[0008] Furthermore, in this utility model, the transmission mechanism includes a driving gear disposed on the output conical shaft of the higher-level continuously variable transmission mechanism and a driven gear disposed on the input conical shaft of the lower-level continuously variable transmission mechanism, wherein the driven gear meshes with the driving gear.

[0009] Furthermore, in this utility model, the aforementioned driving mechanism is a lead screw and nut mechanism, wherein the moving direction of the nut of the lead screw and nut mechanism is parallel to the central axis of any of the aforementioned input tapered shafts; the nut is provided with connecting components corresponding one-to-one with the aforementioned transmission belts, and when the nut moves, the aforementioned connecting components drive the aforementioned transmission belts to move synchronously.

[0010] Furthermore, in this utility model, any of the above-mentioned connecting components includes two sets of clamping rods spaced apart on the above-mentioned nut, and the corresponding suspended section of the above-mentioned transmission belt is clamped between the two sets of the above-mentioned clamping rods.

[0011] The beneficial effects of this utility model are: This utility model provides a cascaded continuously variable transmission (CVT) mechanism. By connecting multiple CVT mechanisms in series, the CVT mechanism at the beginning of the transmission chain is the input, and the CVT mechanism at the end of the transmission chain is the output. This achieves a larger gear ratio range, shortens the shift stroke, and improves shift efficiency and sensitivity while compressing the structural space. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the continuously variable transmission mechanism according to Embodiment 1 of this utility model; Figure 3 for Figure 1 Exploded view; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 5This is a schematic diagram of the structure of Embodiment 3 of this utility model; Figure 6 for Figure 5 Front view; Figure 7 This is a structural schematic diagram of embodiment three of the utility model.

[0013] In the diagram: 101-Drive mechanism; 201-Transmission belt; 202-Input tapered shaft; 203-Output tapered shaft; 301-Driving gear; 302-Driven gear; 401-Clamping lever. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0015] Example 1 Please see Figures 1-3 This embodiment provides a technical solution: A cascaded continuously variable transmission (CVT) mechanism includes a drive mechanism 101 and two sets of CVT mechanisms connected in series. The output end of the CVT mechanism at the upper level is connected to the input end of the CVT mechanism at the lower level. The transmission belts 201 of the two sets of CVT mechanisms move in the same direction, and the drive mechanism 101 is used to drive all transmission belts 201 to move synchronously.

[0016] Specifically, in this embodiment, any continuously variable transmission (CVT) mechanism includes an input conical shaft 202 and an output conical shaft 203 connected by a transmission belt 201. The input conical shaft 202 and the output conical shaft 203 are arranged at intervals, and their central axes are parallel to each other. The large-diameter end of the input conical shaft 202 and the small-diameter end of the output conical shaft 203 are located on the same side. The output conical shaft 203 of the previous CVT mechanism and the input conical shaft 202 of the next CVT mechanism are connected by a transmission mechanism, and the large-diameter end of the output conical shaft 203 of the previous CVT mechanism and the small-diameter end of the input conical shaft 202 of the next CVT mechanism are located on the same side. The drive mechanism 101 is used to drive all transmission belts 201 to reciprocate along the central axis direction of any input conical shaft 202 / output conical shaft 203.

[0017] Preferably, in this embodiment, the transmission mechanism includes a drive gear 301 mounted on the output conical shaft 203 of the previous continuously variable transmission mechanism and a driven gear 302 mounted on the input conical shaft 202 of the next continuously variable transmission mechanism, wherein the driven gear 302 meshes with the drive gear 301.

[0018] Preferably, in this embodiment, the drive mechanism 101 is a lead screw and nut mechanism. The moving direction of the nut of the lead screw and nut mechanism is parallel to the central axis of any input conical shaft 202 / output conical shaft 203. The nut is equipped with connecting components that correspond one-to-one with a plurality of transmission belts 201. When the nut moves, the plurality of connecting components drive the plurality of transmission belts 201 to move synchronously.

[0019] Specifically, in this embodiment, any connecting component includes two sets of clamping rods 401 that are spaced apart on the nut, and the corresponding suspended section of the transmission belt 201 is clamped between the two sets of clamping rods 401.

[0020] Working principle: from Figure 1 From the perspective of the continuously variable transmission (CVT), one end of the input conical shaft 202 of the upper CVT is connected to the main power source (e.g., a motor), and the output conical shaft 203 of the right CVT is connected to the actuator. In use, the main power source drives the input conical shaft 202 of the upper CVT to rotate, while the drive mechanism 101 drives the transmission belt 201 to move. The output conical shaft 203 of the right CVT then rotates accordingly, and this power is transmitted to the actuator.

[0021] Example 2 Please see Figure 4 The difference between this embodiment and Embodiment 1 is that the number of continuously variable transmission (CVT) mechanisms in this embodiment is three. From Figure 4 From the perspective of the camera, the continuously variable transmission (CVT) at the top is the total input, and the continuously variable transmission (CVT) at the bottom is the total output.

[0022] Example 3 Please see Figures 5-7 The difference between this embodiment and Embodiment 1 is that the number of continuously variable transmission (CVT) mechanisms in this embodiment is three. From Figure 6 From the perspective of the camera, the continuously variable transmission (CVT) at the top is the total input, and the CVT at the leftmost position is the total output.

[0023] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A cascaded continuously variable transmission mechanism, characterized in that: It includes a drive mechanism (101) and at least two continuously variable transmission (CVT) mechanisms connected in series. The output end of the CVT mechanism at the upper level is connected to the input end of the CVT mechanism at the lower level. The transmission belts (201) of the two CVT mechanisms move in the same direction. The drive mechanism (101) is used to drive all the transmission belts (201) to move synchronously.

2. The cascaded continuously variable transmission mechanism according to claim 1, characterized in that: Each continuously variable transmission (CVT) includes an input conical shaft (202) and an output conical shaft (203) connected by a transmission belt (201). The input conical shaft (202) and the output conical shaft (203) are arranged at intervals, and their central axes are parallel to each other. The large diameter end of the input conical shaft (202) and the small diameter end of the output conical shaft (203) are located on the same side. The output conical shaft (203) of the previous CVT and the input conical shaft (202) of the next CVT are connected by a transmission mechanism. The large diameter end of the output conical shaft (203) of the previous CVT and the small diameter end of the input conical shaft (202) of the next CVT are located on the same side. The drive mechanism (101) is used to drive all the transmission belts (201) to reciprocate in the direction of the central axis of any input conical shaft (202).

3. The cascaded continuously variable transmission mechanism according to claim 2, characterized in that: The transmission mechanism includes a drive gear (301) mounted on the output conical shaft (203) of the previous continuously variable transmission mechanism and a driven gear (302) mounted on the input conical shaft (202) of the next continuously variable transmission mechanism, wherein the driven gear (302) meshes with the drive gear (301).

4. A cascaded continuously variable transmission mechanism according to claim 2 or 3, characterized in that: The driving mechanism (101) is a lead screw and nut mechanism. The direction of movement of the nut of the lead screw and nut mechanism is parallel to the central axis of any of the input tapered shafts (202). The nut is provided with connecting components that correspond one-to-one with several of the transmission belts (201). When the nut moves, several connecting components drive several transmission belts (201) to move synchronously.

5. A cascaded continuously variable transmission mechanism according to claim 4, characterized in that: Any of the connecting components includes two sets of clamps (401) spaced apart on the nut, and the corresponding suspended section of the transmission belt (201) is clamped between the two sets of clamps (401).

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