Self-adaptive tensioning mechanism for increasing torque of continuously variable transmission

Abstract

The utility model discloses a self-adaptive tensioning mechanism for increasing the torque of a continuously variable transmission, and relates to the technical field of continuously variable transmissions.The continuously variable transmission comprises two conical shafts arranged on a base at intervals, the two conical shafts are both rotationally connected with the base, and the central axes of the two conical shafts are parallel to each other; the large-diameter end of one conical shaft and the small-diameter end of the other conical shaft are located on the same side. The two conical shafts are in tensioning connection through a transmission belt; a driving mechanism is further arranged on the base; the self-adaptive tensioning mechanism is arranged on the driving mechanism and used for adjusting the tensioning degree of the transmission belt. Through the arrangement of the self-adaptive tensioning mechanism, the tensioning degree of the transmission belt in the working process can be increased, so that the friction force between the transmission belt and the conical shaft during operation of the continuously variable transmission is increased, the probability of slipping of the transmission belt in the moving process on the conical shaft is further reduced, and finally the output torque of the continuously variable transmission is improved; therefore, the continuously variable transmission can be applied to wider application scenes.

Description

An adaptive tensioning mechanism to enhance the torque of a continuously variable transmission (CVT) Technical Field

[0001] This utility model relates to the field of continuously variable transmission (CVT) technology, and more specifically, to an adaptive tensioning mechanism for increasing the torque of a CVT. 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] In continuously variable transmission (CVT) mechanisms, the torque of the transmission mechanism is closely related to the frictional force between the drive belt and the driving and driven pulleys. The greater the frictional force between the drive belt and the driving and driven pulleys, the greater the torque that the transmission mechanism can output.

[0004] However, some continuously variable transmission (CVT) mechanisms in the existing technology have the following technical problems: without changing the overall structure of the transmission mechanism, it is inconvenient to adjust the friction between the transmission belt and the driving and driven pulleys, which in turn makes it inconvenient to change the output torque of the CVT mechanism, thus making it unsuitable for a wider range of application scenarios. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT).

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) includes two tapered shafts spaced apart on a base, both of which are rotatably connected to the base. The central axes of the two tapered shafts are parallel to each other, with the large-diameter end of one tapered shaft and the small-diameter end of the other tapered shaft located on the same side. The two tapered shafts are tensioned together by a drive belt. The base is also provided with a drive mechanism for controlling the reciprocating movement of the drive belt along the central axis of the tapered shafts. The adaptive tensioning mechanism is mounted on the drive mechanism and can move synchronously with the drive mechanism to adjust the tension of the drive belt.

[0008] Furthermore, in this utility model, the drive mechanism is located between the two tapered shafts, which enables the transmission belt to switch between different transmission radii of the two tapered shafts and achieve smooth variable transmission ratio transmission; the adaptive tensioning mechanism is provided on the drive mechanism.

[0009] Furthermore, in this utility model, the aforementioned driving mechanism is a lead screw and nut mechanism, and the aforementioned adaptive tensioning mechanism is disposed on the nut of the aforementioned lead screw and nut mechanism.

[0010] Furthermore, in this invention, the number of the aforementioned adaptive tensioning mechanisms is at least one set.

[0011] Furthermore, in this utility model, the aforementioned adaptive tensioning mechanism is in two sets, and the two sets of the aforementioned adaptive tensioning mechanism are symmetrically arranged on the aforementioned nut.

[0012] Furthermore, in this utility model, any of the above-mentioned adaptive tensioning mechanisms includes a sliding sleeve slidably disposed on the nut, an adjusting bolt threadedly connected to the nut, and a fixed pulley rotatably disposed on the sliding sleeve. The central axis of the adjusting bolt and the sliding direction of the sliding sleeve are both perpendicular to the plane formed by the two central axes of the two tapered shafts. One end of the adjusting bolt abuts against the sliding sleeve to control the sliding sleeve to move closer to or further away from the corresponding suspended section of the transmission belt.

[0013] Furthermore, in this utility model, any of the above-mentioned adaptive tensioning mechanisms further includes a slider slidably disposed on the above-mentioned sliding sleeve and two elastic members symmetrically disposed on the above-mentioned slider. The free ends of the two above-mentioned elastic members are connected to the above-mentioned sliding sleeve. The sliding direction of the above-mentioned slider and the extension and retraction direction of any of the above-mentioned elastic members are perpendicular to the plane formed by the two central axes of the two above-mentioned conical shafts. The above-mentioned fixed pulley is rotatably disposed on the above-mentioned slider.

[0014] The beneficial effects of this utility model are:

[0015] This invention provides an adaptive tensioning mechanism to enhance the torque of a continuously variable transmission (CVT). By setting the adaptive tensioning mechanism, the tension of the transmission belt during operation can be increased, thereby increasing the friction between the transmission belt and the tapered shaft during operation of the CVT. This reduces the probability of the transmission belt slipping during its movement on the tapered shaft, ultimately improving the output torque of the CVT and making it suitable for a wider range of applications. Attached Figure Description

[0016] Figure 1 is a top view of an embodiment of the present utility model;

[0017] Figure 2 is a sectional view of section AA in Figure 1;

[0018] Figure 3 is a magnified view of part B in Figure 1.

[0019] In the diagram: 101-tapered shaft; 102-transmission belt; 103-drive mechanism; 1031-nut; 201-sliding sleeve; 202-adjusting bolt; 203-fixed pulley; 204-slider; 205-elastic element. Detailed Implementation

[0020] 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.

[0021] Please refer to Figures 1-3. This utility model provides a technical solution:

[0022] An adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) includes two tapered shafts 101 spaced apart on a base (not shown). In this embodiment, the two tapered shafts 101 have identical shapes and dimensions. One tapered shaft 101 is the drive shaft, and the other is the driven shaft. One end of the drive shaft 101 can be driven to a motor. Both tapered shafts 101 are rotatably connected to the base, and their central axes are parallel to each other. The large-diameter end of one tapered shaft 101 and the small-diameter end of the other tapered shaft 101 are located on the same side. The two tapered shafts 101 are tensioned together by a drive belt 102. A drive mechanism 103 is also mounted on the base to control the reciprocating movement of the drive belt 102 along the central axis of the tapered shafts 101. The adaptive tensioning mechanism is mounted on the drive mechanism 103 and can move synchronously with the drive mechanism 103 to adjust the tension of the drive belt 102.

[0023] Referring to Figure 1, in this embodiment, the drive mechanism 103 is located between two tapered shafts 101, and the drive mechanism 103 is a lead screw and nut mechanism. The adaptive tensioning mechanism is mounted on the nut 1031.

[0024] In other embodiments of this example, the drive mechanism 103 may also be replaced by a mechanism capable of linear reciprocating movement, such as a hydraulic cylinder. For example, when a hydraulic cylinder is used as the drive mechanism 103, the nut 1031 is installed on the actuating end of the hydraulic cylinder, and the installation method of the hydraulic cylinder allows the transmission belt 102 to reciprocate in the direction of the central axis of the tapered shaft 101.

[0025] Specifically, referring to Figure 2, in this embodiment, there are two sets of adaptive tensioning mechanisms. These two sets are symmetrically mounted on the nut 1031. The cooperation of the two sets of adaptive tensioning mechanisms allows the suspended sections of the transmission belt 102 to move closer to or further apart from each other. In other embodiments of this example, the number of adaptive tensioning mechanisms may be one set or multiple sets.

[0026] Referring to Figure 2, the arbitrary adaptive tensioning mechanism in this embodiment includes a sliding sleeve 201 slidably mounted on a nut 1031, an adjusting bolt 202 threadedly connected to the nut 1031, and a fixed pulley 203 rotatably mounted on the sliding sleeve 201. The central axis of the adjusting bolt 202 and the sliding direction of the sliding sleeve 201 are both perpendicular to the plane formed by the two central axes of the two tapered shafts 101. One end of the adjusting bolt 202 abuts against the sliding sleeve 201 to control the sliding sleeve 201 to move closer to or further away from the corresponding suspended section of the transmission belt 102. The sliding connection between the sliding sleeve 201 and the nut 1031 can be a dovetail structure connection. Specifically, a dovetail groove can be opened on the nut 1031, and a dovetail block can be installed on the sliding sleeve 201, so that the dovetail block is slidably connected to the dovetail groove.

[0027] To achieve the adaptive function, referring to Figures 2 and 3, the arbitrary adaptive tensioning mechanism in this embodiment further includes a slider 204 slidably mounted on the sliding sleeve 201 and two elastic elements 205 symmetrically mounted on the slider 204. The free ends of both elastic elements 205 are connected to the sliding sleeve 201. The sliding direction of the slider 204 and the extension / retraction direction of the arbitrary elastic element 205 are both perpendicular to the plane formed by the two central axes of the two tapered shafts 101. A fixed pulley 203 is rotatably mounted on the slider 204. In this embodiment, the elastic element 205 is a helical spring. In other embodiments of this embodiment, the elastic element 205 can also be replaced by an elastic airbag or elastic rubber, etc. The specific size selection and installation method can be adjusted to allow the slider 204 to reciprocate within the sliding sleeve 201.

[0028] Working principle:

[0029] When the continuously variable transmission (CVT) is in operation, the tapered shaft 101, which is the drive shaft, rotates under the control of the corresponding motor, while the tapered shaft 101, which is the driven shaft, rotates synchronously under the drive of the transmission belt 102, and the two tapered shafts 101 rotate in the same direction. When it is necessary to adjust the transmission ratio of this CVT, the drive mechanism 103 operates to drive the transmission belt 102 to move accordingly along the central axis of the tapered shaft 101, thereby changing the transmission ratio.

[0030] When adjusting the output torque of the continuously variable transmission (CVT), as seen in Figure 2, the two adjusting bolts 202 are rotated according to the required torque increase. The upper adjusting bolt 202 moves downwards, and the lower adjusting bolt 202 moves upwards, causing the two sliding sleeves 201 to move closer together under the push of the two adjusting bolts 202. After both fixed pulleys 203 are in contact with the drive belt 102, the two adjusting bolts 202 are rotated further. The drive belt 102 maintains a corresponding tension under the pressure of the two fixed pulleys 203. At this time, by increasing the tension of the drive belt 102 rubbing against the tapered shaft 101, the pressure on the contact surface is increased, thereby increasing the friction between the drive belt 102 and the two tapered shafts 101, reducing the probability of the drive belt 102 slipping during its movement on the tapered shafts 101, and ultimately increasing the output torque of the CVT.

[0031] Due to uncertainties such as thermal expansion and contraction, deformation, and wear that may occur in the structure and materials during actual operation, the adaptive mechanism can achieve adaptive pressure compensation to a certain extent. From the perspective of Figure 2 or Figure 3, regarding the upper adaptive tensioning mechanism, after the adjusting bolt is adjusted to the correct position, the overall length of the upper spring may be less than the overall length of the lower spring. After a period of time, if the transmission belt 102 wears, the fixed pulley 203 will move downwards a certain distance under the action of the upper spring to achieve adaptive pressure compensation.

[0032] 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. An adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT), the CVT comprising two tapered shafts (101) spaced apart on a base, both tapered shafts (101) being rotatably connected to the base, the central axes of the two tapered shafts (101) being parallel to each other, wherein the large-diameter end of one tapered shaft (101) and the small-diameter end of the other tapered shaft (101) are located on the same side; the two tapered shafts (101) are tensioned together by a drive belt (102); the base is further provided with a drive mechanism (103) for controlling the reciprocating movement of the drive belt (102) in the direction of the central axis of the tapered shafts (101); characterized in that: The adaptive tensioning mechanism is mounted on the drive mechanism (103) and can move synchronously with the drive mechanism (103). It is used to adjust the tension of the transmission belt (102).

2. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 1, characterized in that: The drive mechanism (103) is located between the two tapered shafts (101), which can enable the transmission belt (102) to switch between different transmission radii of the two tapered shafts (101) and achieve smooth transmission ratio transmission; the adaptive tensioning mechanism is set on the drive mechanism (103).

3. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 2, characterized in that: The drive mechanism (103) is a lead screw and nut mechanism, and the adaptive tensioning mechanism is disposed on the nut (1031) of the lead screw and nut mechanism.

4. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 3, characterized in that: The number of adaptive tensioning mechanisms is at least one set.

5. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 4, characterized in that: The adaptive tensioning mechanism consists of two sets, which are symmetrically arranged on the nut (1031).

6. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 5, characterized in that: Any of the adaptive tensioning mechanisms includes a sliding sleeve (201) slidably disposed on the nut (1031), an adjusting bolt (202) threadedly connected to the nut (1031), and a fixed pulley (203) rotatably disposed on the sliding sleeve (201). The central axis of the adjusting bolt (202) and the sliding direction of the sliding sleeve (201) are both perpendicular to the plane formed by the two central axes of the two tapered shafts (101). One end of the adjusting bolt (202) abuts against the sliding sleeve (201) to control the sliding sleeve (201) to move closer to or away from the corresponding suspended section of the transmission belt (102).

7. The adaptive tensioning mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 6, characterized in that: The adaptive tensioning mechanism further includes a slider (204) slidably disposed on the sliding sleeve (201) and two elastic elements (205) symmetrically disposed on the slider (204). The free ends of the two elastic elements (205) are connected to the sliding sleeve (201). The sliding direction of the slider (204) and the extension direction of the elastic element (205) are perpendicular to the plane formed by the two central axes of the two tapered shafts (101). The fixed pulley (203) is rotatably disposed on the slider (204).

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