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

Abstract

The utility model discloses a self-adaptive pressure 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, 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 pressure mechanism is arranged on the base and used for adjusting the friction force between the transmission belt and any conical shaft. According to the continuously variable transmission, through the arrangement of the self-adaptive pressure mechanism, the friction force between the transmission belt and the conical shaft can be increased when the continuously variable transmission runs, then the probability that the transmission belt slips on the conical shaft in the moving process is reduced, and finally the output torque of the continuously variable transmission is improved, so that the continuously variable transmission can be applied to wider application scenes.

Description

Technical Field

[0001] This utility model relates to the field of continuously variable transmission (CVT) technology, and more specifically, to an adaptive pressure 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: it is inconvenient to increase the transmission torque during the transmission process without changing the overall structure of the transmission mechanism, thus making them unsuitable for a wider range of application scenarios. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive pressure 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 pressure 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 connected by a tensioned 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 pressure mechanism is provided on the base and is used to adjust the frictional force between the drive belt and either of the tapered shafts.

[0008] Furthermore, in this invention, the number of the aforementioned adaptive pressure mechanisms is at least one set.

[0009] Furthermore, in this utility model, the adaptive pressure mechanism is divided into two sets, and the two sets of adaptive pressure mechanisms correspond one-to-one with the two tapered shafts; any of the adaptive pressure mechanisms can adjust the friction between the transmission belt and the corresponding tapered shaft.

[0010] Furthermore, in this utility model, any of the above-mentioned adaptive pressure mechanisms includes rollers and two sets of adjustment mechanisms, each mounted on the base. The rollers are slidably connected to the base, the central axis of the rollers is parallel to the generatrix of the corresponding conical shaft, and the sliding direction of the rollers is perpendicular to the generatrix of the corresponding conical shaft. The two sets of adjustment mechanisms cooperate to make the rollers move closer to or further away from the corresponding conical shaft.

[0011] Furthermore, in this utility model, any of the above-mentioned adjustment mechanisms includes a sliding sleeve disposed at one end of the roller and an adjusting bolt threadedly connected to the base. The sliding sleeve is slidably connected to the base, and the sliding direction of the sliding sleeve is perpendicular to the generatrix of the corresponding tapered shaft. The adjusting bolt abuts against the sliding sleeve to control the sliding sleeve to move closer to or away from the corresponding tapered shaft.

[0012] Furthermore, in this utility model, any of the above-mentioned adjustment mechanisms also includes an adaptive mechanism. The adaptive mechanism includes a slider disposed at one end of the roller and two elastic elements disposed on the slider. The slider is slidably connected to the sliding sleeve. The two elastic elements are symmetrically distributed about the central axis of the roller. The free ends of the two elastic elements are connected to the sliding sleeve. The sliding direction of the slider and the extension / retraction direction of any of the elastic elements are perpendicular to the generatrix of the corresponding conical shaft.

[0013] Furthermore, in this utility model, the drive mechanism is located between the two tapered shafts. The drive mechanism is a screw and nut mechanism, which enables the transmission belt to switch between different transmission radii of the two tapered shafts and achieve smooth transmission ratio transmission. The nut is provided with two sets of clamps spaced apart, and the suspended section of the transmission belt is clamped between the two sets of clamps.

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

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

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

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 101-tapered shaft; 102-transmission belt; 103-drive mechanism; 1031-nut; 1032-clamping rod; 201-roller; 202-sliding sleeve; 203-adjusting bolt; 204-slider; 205-elastic element. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1 and Figure 2 This utility model provides a technical solution:

[0021] An adaptive pressure 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 for controlling the reciprocating movement of the drive belt 102 along the central axis of the tapered shafts 101 is also mounted on the base. This adaptive pressure mechanism, mounted on the base, is used to adjust the friction between the drive belt 102 and either tapered shaft 101.

[0022] Specifically, in this embodiment, there are two sets of adaptive pressure mechanisms, each corresponding to one of the two conical shafts 101. Either adaptive pressure mechanism can adjust the friction between the transmission belt 102 and the corresponding conical shaft 101. Each adaptive pressure mechanism includes rollers 201 mounted on a base and two sets of adjustment mechanisms. The two sets of adjustment mechanisms are respectively mounted at both ends of the rollers 201. The rollers 201 are slidably connected to the base, and the central axis of the rollers 201 is parallel to the generatrix of the corresponding conical shaft 101. The sliding direction of the rollers 201 is perpendicular to the generatrix of the corresponding conical shaft 101. The two sets of adjustment mechanisms cooperate to move the rollers 201 closer to or further away from the corresponding conical shaft 101. In other embodiments of this embodiment, the adaptive pressure mechanism can be one set or multiple sets.

[0023] Specifically, in this embodiment, any adjustment mechanism includes a sliding sleeve 202 installed at one end of the roller 201 and an adjusting bolt 203 threadedly connected to the base. The sliding sleeve 202 is slidably connected to the base, and the sliding direction of the sliding sleeve 202 is perpendicular to the generatrix of the corresponding tapered shaft 101. The adjusting bolt 203 abuts against the sliding sleeve 202 to control the sliding sleeve 202 to move closer to or away from the corresponding tapered shaft 101. In other embodiments of this embodiment, the adjusting bolt 203 can also be replaced by a hydraulic cylinder. During installation, the actuating end of the hydraulic cylinder abuts against the sliding sleeve 202, and the extension and retraction direction of the hydraulic cylinder is perpendicular to the generatrix of the corresponding tapered shaft 101. The sliding connection between the sliding sleeve 202 and the base can adopt a dovetail structure connection. Specifically, a dovetail groove can be opened on the base, and a dovetail block can be installed on the sliding sleeve 202, so that the dovetail block is slidably connected to the dovetail groove.

[0024] To achieve the adaptive function, the arbitrary adjustment mechanism in this embodiment also includes an adaptive mechanism. The adaptive mechanism includes a slider 204 mounted on one end of the roller 201 and two elastic elements 205 mounted on the slider 204. The slider 204 is slidably connected to a sliding sleeve 202. The two elastic elements 205 are symmetrically distributed about the central axis of the roller 201. The free ends of both elastic elements 205 are connected to the sliding sleeve 202. The sliding direction of the slider 204 and the extension / retraction direction of any elastic element 205 are perpendicular to the generatrix of the corresponding conical shaft 101. The end of the roller 201 can be fixedly connected to the slider 204 or rotatably connected to 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 should ensure that the roller 201 can reciprocate in a direction perpendicular to the generatrix of the corresponding conical shaft 101.

[0025] Reference 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. In order to facilitate the movement of the transmission belt 102, two sets of clamping rods 1032 are installed on the nut 1031 at intervals, and the suspended part of the transmission belt 102 is clamped between the two sets of clamping rods 1032.

[0026] In other embodiments of this example, the drive mechanism 103 can also be replaced by a mechanism capable of linear reciprocating movement, such as a hydraulic cylinder or a linear motor. For example, when the drive mechanism 103 uses a hydraulic cylinder, 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; for example, when the drive mechanism 103 uses a linear motor, the nut 1031 is installed on the linear motor, and the installation method of the linear motor allows the transmission belt 102 to reciprocate in the direction of the central axis of the tapered shaft 101.

[0027] Working principle:

[0028] 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.

[0029] When it is necessary to adjust the output torque of the continuously variable transmission, only one set of adaptive pressure mechanisms can be activated, or both sets of adaptive pressure mechanisms can be activated simultaneously.

[0030] from Figure 1 From a certain perspective, for example, when only the adaptive pressure mechanism on the left needs to work, the two adjusting bolts 203 on the left are rotated according to the required increase in torque, so that the left roller 201 moves towards the left tapered shaft 101. After adjustment, the left roller 201 presses a portion of the transmission belt 102 onto the left tapered shaft 101 with a certain pressure. This increases the friction between the transmission belt 102 and the left tapered shaft 101, reduces the probability of the transmission belt 102 slipping during its movement on the tapered shaft 101, and ultimately improves the output torque of the continuously variable transmission.

[0031] Due to uncertainties such as thermal expansion and contraction, deformation, and wear that may occur in the structure and materials during actual operation, adaptive mechanisms can achieve adaptive pressure compensation to a certain extent. Figure 2 From this perspective, when the two adjusting bolts on the same side are adjusted to their positions, the overall length of the left spring may be less than that of the right spring. After a period of time, if the drive belt 102 wears down, the roller 201 will move to the right a certain distance under the action of the left 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 pressure 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 and connected 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 pressure mechanism is mounted on the base and is used to adjust the friction between the drive belt (102) and any of the tapered shafts (101).

2. The adaptive pressure mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 1, characterized in that: The number of adaptive pressure mechanisms is at least one set.

3. The adaptive pressure mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 2, characterized in that: The adaptive pressure mechanism consists of two sets, each set corresponding to one of the two tapered shafts (101); any one of the adaptive pressure mechanisms can adjust the friction between the transmission belt (102) and the corresponding tapered shaft (101).

4. The adaptive pressure mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 3, characterized in that: Each of the adaptive pressure mechanisms includes rollers (201) mounted on the base and two sets of adjustment mechanisms. The rollers (201) are slidably connected to the base. The central axis of the rollers (201) is parallel to the generatrix of the corresponding conical shaft (101), and the sliding direction of the rollers (201) is perpendicular to the generatrix of the corresponding conical shaft (101). The two sets of adjustment mechanisms cooperate to move the rollers (201) closer to or further away from the corresponding conical shaft (101).

5. The adaptive pressure mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 4, characterized in that: Any of the adjustment mechanisms includes a sliding sleeve (202) disposed at one end of the roller (201) and an adjusting bolt (203) threadedly connected to the base. The sliding sleeve (202) is slidably connected to the base, and the sliding direction of the sliding sleeve (202) is perpendicular to the generatrix of the corresponding tapered shaft (101). The adjusting bolt (203) abuts against the sliding sleeve (202) to control the sliding sleeve (202) to move closer to or away from the corresponding tapered shaft (101).

6. The adaptive pressure mechanism for increasing the torque of a continuously variable transmission (CVT) according to claim 5, characterized in that: The adjustment mechanism further includes an adaptive mechanism, which includes a slider (204) disposed at one end of the roller (201) and two elastic elements (205) disposed on the slider (204). The slider (204) is slidably connected to the sliding sleeve (202). The two elastic elements (205) are symmetrically distributed about the central axis of the roller (201). The free ends of the two elastic elements (205) are connected to the sliding sleeve (202). The sliding direction of the slider (204) and the extension and retraction direction of any elastic element (205) are perpendicular to the generatrix of the corresponding tapered shaft (101).

7. The adaptive pressure 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). The drive mechanism (103) is a screw and nut mechanism, which enables the transmission belt (102) to switch between different transmission radii of the two tapered shafts (101) and achieve smooth transmission ratio transmission. The nut (1031) is provided with two sets of clamps (1032) spaced apart. The suspended section of the transmission belt (102) is clamped between the two sets of clamps (1032).

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