Belt transmission tensioning device based on variable wheel base

Abstract

The utility model discloses a belt transmission tensioning device based on a variable axle distance, which comprises a driving wheel and a driven wheel, the driving wheel and the driven wheel are in transmission connection through a belt, and the driven wheel is arranged on a rack through a support frame; the supporting frame is used for driving the driven wheel to be close to or away from the driving wheel so as to adjust the axial distance between the driven wheel and the driving wheel. The swinging supporting frame is arranged to drive the driven wheel to be close to or away from the driving wheel, the distance between the driven wheel and the driving wheel shaft is adjusted, the number of contact points of a tensioning mechanism and a belt is reduced through single-point swinging type belt tensioning adjustment, the friction loss of the belt can be reduced, and meanwhile the service life of the belt is prolonged.

Description

Belt drive tensioning device based on variable shaft pitch Technical Field

[0001] This utility model relates to the field of agricultural machinery transmission technology, and in particular to a belt drive tensioning device based on variable shaft pitch. Background Technology

[0002] Belt drives, as a common transmission method, are widely used in various transmission fields, especially in transportation vehicles and agricultural machinery. During the operation of a belt drive, because belts are prone to slack, they need to be tensioned to apply positive pressure and ensure that the belt does not slip.

[0003] Traditional machinery (such as harvesters) generally uses a tensioner belt with a pressure pulley for power transmission, which has the following drawbacks:

[0004] 1. The pressure roller increases friction, resulting in power loss (approximately 15-20%).

[0005] 2. The three-point contact structure accelerates belt wear (increases the friction surface by 50%).

[0006] 3. The complex structure makes it difficult to replace parts. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a belt drive tensioning device based on variable shaft pitch. By setting a swingable support frame, the driven wheel is moved closer to or away from the driving wheel, thereby adjusting the shaft distance between the driven wheel and the driving wheel. The single-point swing belt tensioning adjustment reduces the number of contact points between the tensioning mechanism and the belt, which can reduce belt friction loss and extend belt life.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A belt drive tensioning device based on variable wheelbase includes a driving pulley and a driven pulley, which are connected by a belt drive. The driven pulley is mounted on a frame via a support frame.

[0010] The support frame is used to move the driven wheel closer to or away from the driving wheel to adjust the axial distance between the driven wheel and the driving wheel.

[0011] Furthermore, the frame includes crossbeams.

[0012] Furthermore, the support frame includes a transmission box and two swing arms disposed on both sides of the bottom of the transmission box. The driven wheel is rotatably connected to the transmission box through a transmission shaft. An installation gap is formed between the two swing arms. The two swing arms are connected to the crossbeam through pins. The two swing arms form a swing pair with the crossbeam through pins. A swing gap is provided between the transmission box and the crossbeam.

[0013] The crossbeam is equipped with a telescopic drive rod, which drives the swing arm to swing when it reciprocates along its axial direction.

[0014] Furthermore, the telescopic drive rod is one of an electric push rod, a pneumatic cylinder, or a hydraulic cylinder.

[0015] Furthermore, the transmission box includes a top plate, two symmetrically arranged first side plates, and two second side plates disposed between the two first side plates. Each of the top plate, first side plates, and second side plates has a connecting groove and a connecting protrusion at its edge. The top plate, first side plates, and second side plates are connected to each other via the connecting groove and the connecting protrusion. The connecting protrusion and connecting groove are used for positioning during connection. After connection, the top plate, first side plates, and second side plates can be fixed at the connection point by bolts or by welding.

[0016] Furthermore, the first side plate and the swing arm are an integrated structure.

[0017] Furthermore, a buffer rubber pad is provided at the connection between the pin and the crossbeam.

[0018] Furthermore, the crossbeam is provided with a slide rail in a direction perpendicular to the axis of the drive wheel, and the support frame is provided with a slider that slides in cooperation with the slide rail.

[0019] The beneficial effects of this utility model are:

[0020] This invention uses a swingable support frame to move the driven wheel closer to or away from the driving wheel, thereby adjusting the distance between the shafts of the driven and driving wheels. The single-point swing belt tension adjustment reduces the number of contact points between the tensioning mechanism and the belt, which can reduce belt friction loss and extend belt life. Attached Figure Description

[0021] Figure 1 is a perspective view of the belt drive tensioning device based on variable shaft pitch applied to a harvester in the embodiment of this utility model.

[0022] Figure 2 is a perspective view of the belt drive tensioning device based on variable wheelbase after concealing part of the harvester structure;

[0023] Figure 3 is a front view of the belt drive tensioning device based on variable wheelbase after concealing part of the harvester structure;

[0024] Figure 4 is a three-dimensional view of the support frame;

[0025] In the diagram, 1 is the driving wheel; 2 is the driven wheel; 3 is the support frame; 4 is the crossbeam; 5 is the transmission box; 6 is the swing arm; 7 is the pin; 8 is the telescopic drive rod; 9 is the top plate; 10 is the first side plate; and 11 is the second side plate. Detailed Implementation

[0026] 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.

[0027] Referring to Figures 1-4, this utility model provides a technical solution: Embodiment

[0028] As shown in Figures 1-4, a belt drive tensioning device based on variable shaft pitch includes a driving wheel 1 and a driven wheel 2, which are connected by a belt drive. The driven wheel 2 is mounted on the frame by a support frame 3.

[0029] The support frame 3 is used to drive the driven wheel 2 closer to or further away from the driving wheel 1 to adjust the axial distance between the driven wheel 2 and the driving wheel 1.

[0030] The frame includes a crossbeam 4.

[0031] As shown in Figure 4, the support frame 3 includes a transmission box 5 and two swing arms 6 located on both sides of the bottom of the transmission box 5. The driven wheel 2 is rotatably connected to the transmission box 5 through a transmission shaft. An installation gap is formed between the two swing arms 6. The two swing arms 6 are connected to the crossbeam 4 through a pin 7. The two swing arms 6 form a swing pair with the crossbeam 4 through the pin 7. A swing gap is provided between the transmission box 5 and the crossbeam 4.

[0032] The crossbeam 4 is provided with a telescopic drive rod 8, which drives the swing arm 6 to swing when it reciprocates along its axial direction.

[0033] The telescopic drive rod 8 can be one of an electric push rod, a pneumatic cylinder, or a hydraulic cylinder. Taking a pneumatic cylinder as an example, the cylinder body is hinged to the crossbeam 4, and the piston end of the cylinder is hinged to the wall of the transmission box 5.

[0034] As shown in Figure 4, the transmission box 5 includes a top plate 9, two symmetrically arranged first side plates 10, and two second side plates 11 disposed between the two first side plates 10. Each of the top plate 9, the first side plates 10, and the second side plates 11 has a connecting groove and a connecting protrusion at its edge. The top plate 9, the first side plates 10, and the second side plates 11 are connected to each other via the connecting groove and the connecting protrusion. The connecting protrusion and the connecting groove are used for positioning during connection. After connection, the top plate 9, the first side plates 10, and the second side plates 11 can be fixed at the connection point by bolts or by welding. In this embodiment, when the drive shaft is connected to the transmission box 5, flanges are provided between the two first side plates 10 of the transmission box 5. The two flanges are tightened by bolts, thereby fixing the first side plates 10 to the top plate 9 and the second side plates 11. To ensure the connection effect, the two second side plates 11 can also be tightened by bolts. This arrangement of the top plate 9, the first side plates 10, and the second side plates 11 facilitates their individual processing and also facilitates the disassembly and assembly of the transmission box 5.

[0035] The first side plate 10 and the swing arm 6 are an integrated structure.

[0036] A buffer rubber pad (Shore hardness 60±5) is provided at the connection between the pin 7 and the crossbeam 4.

[0037] When the belt is tensioned or relaxed, the telescopic drive rod 8 is activated to retract or extend, thereby driving the swing arm 6 to swing around the pin 7. When the swing arm 6 swings, the driven wheel 2 on it moves synchronously, thereby moving the driven wheel 2 away from or closer to the driving wheel 1, thereby adjusting the wheelbase between the driven wheel 2 and the driving wheel 1, and thus tensioning or relaxing the belt.

[0038] This invention uses a swingable support frame 3 to move the driven wheel 2 closer to or further away from the driving wheel 1, thereby adjusting the distance between the shafts of the driven wheel 2 and the driving wheel 1. The single-point swing-type belt tension adjustment reduces the number of contact points between the tensioning mechanism and the belt, thus reducing belt friction loss and extending belt life. Example

[0039] The difference between this embodiment and Embodiment 1 is that the crossbeam is provided with a slide rail in a direction perpendicular to the axis of the driving wheel. The support frame structure in this embodiment is the same as in Embodiment 1, with a slider at the bottom of the support frame that slides in cooperation with the slide rail. The slider is a self-locking slider. The distance between the driven wheel and the driving wheel shaft can be adjusted by sliding the support frame.

[0040] 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 belt drive tensioning device based on variable wheelbase, comprising a driving pulley and a driven pulley, wherein the driving pulley and the driven pulley are connected by a belt drive, characterized in that: The driven wheel is mounted on the frame via a support frame; the support frame is used to move the driven wheel closer to or away from the driving wheel to adjust the axial distance between the driven wheel and the driving wheel; the frame includes a crossbeam; the support frame includes a transmission box and two swing arms located on both sides of the bottom of the transmission box; the driven wheel is rotatably connected to the transmission box via a transmission shaft; an installation gap is formed between the two swing arms; the two swing arms are connected to the crossbeam via pins; the two swing arms form a swing pair with the crossbeam via pins; a swing gap is provided between the transmission box and the crossbeam; a telescopic drive rod is provided on the crossbeam; when the telescopic drive rod reciprocates along its axial direction, it drives the swing arms to swing.

2. The belt drive tensioning device based on variable shaft pitch according to claim 1, characterized in that: The telescopic drive rod is one of the following: an electric push rod, a pneumatic cylinder, or a hydraulic cylinder.

3. The belt drive tensioning device based on variable shaft pitch according to claim 1, characterized in that: The transmission box includes a top plate, two symmetrically arranged first side plates, and two second side plates arranged between the two first side plates. The top plate, the first side plates, and the second side plates are respectively provided with connecting grooves and connecting protrusions at their edges. The top plate, the first side plates, and the second side plates are connected to each other through the connecting grooves and connecting protrusions.

4. The belt drive tensioning device based on variable shaft pitch according to claim 3, characterized in that: The first side plate and the swing arm are an integrated structure.

5. The belt drive tensioning device based on variable shaft pitch according to claim 1, characterized in that: A buffer rubber pad is provided at the connection between the pin and the crossbeam.

6. The belt drive tensioning device based on variable shaft pitch according to claim 1, characterized in that: The crossbeam is provided with a slide rail in a direction perpendicular to the axis of the drive wheel, and the support frame is provided with a slider that slides in cooperation with the slide rail.

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