Improved passive speed regulation belt wheel

Abstract

The utility model relates to an improved passive speed regulation belt wheel which comprises a fixed disc, a movable disc, a plurality of compression springs, a linear bearing or a sliding bearing and a plurality of long bolts. The fixed disc is composed of a disc body and a fixed disc hub, and the fixed disc hub is fixedly connected with the transmission shaft through a radial fastener. The movable disc is composed of a disc body and a movable disc hub; the fixed disc and the movable disc are coaxially arranged in a close mode, a plurality of linear bearings or sliding bearings are installed in a hub of the movable disc in the axial direction, and the movable disc is movably installed on the transmission shaft through the linear bearings or the sliding bearings. A plurality of long bolts are evenly distributed on the periphery of a hub of the movable disc in the circumferential direction and penetrate through corresponding reserved holes in the movable disc and the fixed disc to be fastened, a compression spring is preassembled on each long bolt, the inner end of each compression spring tightly presses the outer end of a disc body of the movable disc, and the outer end of each compression spring tightly presses a gasket installed on the inner side of a bolt cap of the corresponding long bolt. And the movable disc is in pressing contact with the fixed disc by a set pre-tightening force. According to the utility model, the pre-tightening force of the compression spring can be conveniently adjusted, and the speed regulation reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural harvesters, relates to a belt-driven stepless speed regulation structure, and specifically relates to an improved passive speed regulation pulley. Background Art

[0002] Among the existing agricultural machinery models, the continuously variable transmission is Figure 4 , which is composed of a driving pulley and a passive pulley and a belt connecting the driving pulley and the passive pulley. Both the driving pulley and the passive pulley are composed of a fixed plate 10 and a movable plate 9. When performing stepless speed regulation, the movable plate of the driving pulley is controlled to move relative to the fixed plate to change the pitch circle of the pulley at the driving pulley end. Due to the limitation of the belt length, the movable plate at the passive pulley end is adaptively adjusted relative to its own fixed plate.

[0003] Most of the existing continuously variable transmission driven wheels achieve effective control of the driven pulley through the deformation of a single compression spring. Structurally, paired tooth pads, tooth pad meshing sleeves with internal splines, drive shafts with external splines, oil-containing bushings, etc. are mostly used. The structure is relatively complex and the cost of component processing is high.

[0004] In addition, a single compression spring 8 is deformed to control the passive pulley, a baffle is set outside one side of the moving plate, the baffle compresses the outer end of the compression spring, multiple bolts 11 pass through the baffle, the bolts pass through the reserved holes on the fixed plate and the moving plate, and a locking nut is installed on the bolt on the outer side of the moving plate to achieve compression of the compression spring. With this structural form, since the compression spring is thicker and has a relatively large stiffness, when pre-tightening the compression spring, it is necessary to push the baffle 7 at one end of the baffle and simultaneously tighten multiple locking nuts at the other end, which is laborious to install. In addition, since the stiffness of a single spring is relatively large, when the set compression force is about to be reached, a smaller tightening amount will correspond to a larger change in the pre-tightening force, and it is necessary to accurately control the screw-in amount of the locking nut. However, it is usually difficult to accurately control the screw-in amount of the locking nut, resulting in excessive or insufficient pre-tightening force of the compression spring, which will have an adverse effect on the continuously variable transmission, so the speed regulation stability needs to be improved. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an improved passive speed regulating pulley which has a simple structure, is easy to install and disassemble, is easy to adjust the spring preload force, and can improve the accuracy of the spring preload force adjustment, thereby improving the reliability and stability of the speed regulation.

[0006] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0007] An improved passive speed regulating pulley, characterized in that it comprises a fixed plate, a movable plate, a plurality of compression springs, a linear bearing or a sliding bearing, and a plurality of long bolts; the fixed plate is composed of a plate body and a fixed plate hub arranged at the center of the plate body, and the fixed plate hub is fixedly connected to the transmission shaft through a radial fastener; the movable plate is composed of a plate body and a movable plate hub arranged at the center of the plate body; the fixed plate and the movable plate are coaxially arranged in a close manner, a plurality of linear bearings or sliding bearings are axially installed in the movable plate hub, and the movable plate is movably installed on the transmission shaft through the linear bearing or the sliding bearing; a plurality of long bolts are evenly distributed along the circumferential direction on the periphery of the movable plate hub, and pass through corresponding reserved holes on the movable plate and the fixed plate to achieve fastening, a compression spring is pre-installed on each long bolt, the inner end of the compression spring presses the outer end of the movable plate, and the outer end of the compression spring is pressed against the washer installed on the inner side of the bolt cap of the long bolt, so that the movable plate forms a pressing contact with the fixed plate with a set pre-tightening force.

[0008] Moreover, an annular boss is arranged on the end surface of the disk body of the movable disk at the periphery of the hub, and the inner end of the compression spring is in tight contact with the outer end surface of the annular boss.

[0009] Moreover, there are three compression springs and three long bolts.

[0010] The advantages and positive effects of the utility model are:

[0011] 1. The utility model adopts three long bolts and three springs sleeved on the long bolts to realize the gap-adjustable connection between the moving plate and the top plate. Compared with the existing single-compression structure, under the condition of meeting the same spring pre-tightening, the compression spring can adopt a low-rigidity and small-diameter spring. When pre-tightening the spring, it is only necessary to tighten the locking nut connected to the long bolt at one end of the moving plate, and there is no need to tighten the long bolt at the other end, that is, the pre-tightening of the compression spring can be completed by a single person. In addition, the three compression springs can be pre-tightened separately, which facilitates the spring pre-tightening operation and saves manpower; in addition, since the stiffness of a single spring is reduced, it is easy to achieve precise control of the screw-in amount of the locking nut, so that the pre-tightening force of the compression spring can be better controlled, making the spring absorption and release capabilities more stable.

[0012] 2. The utility model adopts three long bolts and three springs sleeved on the long bolts to realize the gap adjustable connection mode between the moving plate and the fixed plate, which improves the speed regulation stability, ensures the reliability of speed regulation during use, and will not cause jamming.

[0013] 3. The hub of the movable disc of the utility model adopts a long hub setting, which is slidably connected to the transmission shaft through multiple axially arranged linear bearings or sliding bearings, which simplifies the structure of the passive speed regulating pulley and facilitates installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is the appearance plan view of the utility model;

[0015] Figure 2 It is a perspective view of the utility model;

[0016] Figure 3 It is a three-dimensional diagram of the appearance of the utility model;

[0017] Figure 4 This is a schematic diagram of the existing structure. DETAILED DESCRIPTION

[0018] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0019] An improved passive speed regulating pulley, see Figure 1-Figure 3 , and its invention point is: it includes a fixed plate 1, a moving plate 2, multiple compression springs 4, linear bearings or sliding bearings 6, and multiple long bolts 5. The fixed plate is composed of a plate body 1.2 and a fixed plate hub 1.1 arranged at the center of the plate body. The fixed plate hub is fixed to the transmission shaft through radial fasteners 3 (radially installed bolts), and there is no displacement during the speed adjustment process. The moving plate is composed of a plate body 2.2 and a moving plate hub 2.1 arranged at the center of the plate body. The moving plate hub adopts a long hub and can be installed with multiple linear bearings or sliding bearings. The fixed plate and the moving plate are coaxially arranged in a close manner, and the moving plate is installed on the transmission shaft through linear bearings or sliding bearings. Under non-fastening conditions, the moving plate installed with linear bearings or sliding bearings can slide freely on the transmission shaft. A plurality of long bolts are evenly distributed along the circumferential direction on the periphery of the moving plate hub, and pass through corresponding reserved holes on the moving plate and the fixed plate for fastening. A compression spring is pre-installed on each long bolt, and the inner end of the compression spring presses the outer end of the moving plate body, and the outer end of the compression spring is pressed against the washer installed on the inner side of the bolt cap of the long bolt, so that the moving plate forms a pressing contact with the fixed plate with a set pre-tightening force.

[0020] In the above structure, since the disk body of the moving disk is a thin plate, in order to avoid the compression spring being directly pressed on the end face of the disk body and to ensure the strength of the moving disk body, an annular boss is provided on the end face of the disk body of the moving disk and located on the periphery of the wheel hub, and the inner end of the compression spring is in pressing contact with the outer end face of the annular boss.

[0021] In the above structure, there are three compression springs and three long bolts.

[0022] By adopting the above improved passive speed regulating pulley, when the fan speed increases, the distance between the moving and fixed disks of the active pulley of the fan is reduced, and the pitch circle size of the pulley increases. Since the belt length remains unchanged, the belt drives the moving disk of the passive pulley to move, the distance between the moving and fixed disks of the passive pulley increases, and the pitch circle size of the pulley decreases, thereby realizing "increasing the diameter of the active pulley and reducing the diameter of the passive pulley", achieving the purpose of speed increase.

[0023] When the fan is decelerating, the distance between the moving and fixed disks of the active pulley of the fan increases, and the pitch circle size of the pulley decreases. Since the belt length remains unchanged, the belt drives the moving disk of the passive pulley to move, the distance between the moving and fixed disks of the passive pulley decreases, and the pitch circle size of the pulley decreases and increases. Thus, the "active pulley diameter decreases and the passive pulley diameter increases" is achieved, achieving the purpose of deceleration.

[0024] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An improved passive speed regulating pulley, characterized in that: It includes a fixed plate, a movable plate, multiple compression springs, linear bearings or sliding bearings, and multiple long bolts; the fixed plate is composed of a plate body and a fixed plate hub arranged at the center of the plate body, and the fixed plate hub is fixedly connected to the transmission shaft through a radial fastener; the movable plate is composed of a plate body and a movable plate hub arranged at the center of the plate body; the fixed plate and the movable plate are coaxially arranged in a close manner, and multiple linear bearings or sliding bearings are axially installed in the movable plate hub, and the movable plate is movably installed on the transmission shaft through the linear bearings or sliding bearings; multiple long bolts are evenly distributed along the circumferential direction on the periphery of the movable plate hub, and pass through corresponding reserved holes on the movable plate and the fixed plate to achieve fastening, and a compression spring is pre-installed on each long bolt, the inner end of the compression spring presses the outer end of the movable plate, and the outer end of the compression spring is pressed against the washer installed on the inner side of the bolt cap of the long bolt, so that the movable plate forms a pressing contact with the fixed plate with a set pre-tightening force.

2. The improved passive speed regulating pulley according to claim 1 is characterized in that: An annular boss is arranged on the end surface of the disk body of the movable disk and located at the periphery of the hub, and the inner end of the compression spring is in tight contact with the outer end surface of the annular boss.

3. The improved passive speed regulating pulley according to claim 1 is characterized in that: The number of the compression springs and the number of the long bolts are three.

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