Transmission belt tensioning device and micro excavator

Abstract

The utility model discloses a transmission belt tensioner and miniature excavator belong to engineering machinery transmission system technical field. It is difficult to solve the space restriction problem of existing miniature excavator, including tensioning frame, tensioning mounting panel, sliding support and tensioning wheel, and the tensioning frame is installed on the engine, and is close to the power output end of generator, and the tensioning mounting panel is installed on the tensioning frame, and the top of tensioning mounting panel is equipped with mounting block, and the sliding support is connected on the tensioning frame and includes adjusting mechanism installed on the top of sliding support and corresponding with mounting block, the slide groove group opened on the sliding support, the mounting piece through the slide groove group and connected with tensioning mounting panel, and the tensioning wheel is installed on the sliding support and the outer surface is close to the belt, and the adjusting mechanism moves relative to mounting block, drives the longitudinal sliding of sliding support relative to tensioning frame, makes the tensioning wheel realize the tensioning adjustment of belt. The utility model realizes the efficient adjustment of belt tension under the limited space of miniature excavator.

Description

Technical Field

[0001] This utility model relates to a transmission belt tensioning device and a mini excavator, belonging to the technical field of engineering machinery transmission systems. Background Technology

[0002] Mini excavators, with their advantages of small turning radius, limited working space, and high maneuverability, are widely used in landscaping and urban redevelopment. The generator on a mini excavator is a key device that converts mechanical energy into electrical energy, providing power to the entire machine. The engine is cooled by a cooling fan during operation. The cooling fan is connected to the generator via a belt to drive its rotation. However, after prolonged use, the belt can loosen, causing a decrease in the cooling fan's performance; therefore, the belt requires regular maintenance. Although existing technologies include tensioning devices for belt tension adjustment, the limited space in mini excavators means that the excavator cab must be removed each time the belt tension is adjusted. Furthermore, the adjustment precision of the belt tension is difficult to control. Typically, the tension is changed manually by adjusting the position of the generator in the chute to ensure that the tension value meets the working requirements. Therefore, the belt adjustment process in existing technologies is complex and cumbersome, resulting in high belt maintenance costs. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to overcome the shortcomings of the prior art and provide a transmission belt tensioning device and a mini excavator. By installing the tensioning wheel in the compact gap between the engine and the generator through the tensioning frame, tensioning mounting plate and sliding bracket, the sliding bracket is driven to move up and down by the adjustment mechanism, which in turn drives the tensioning wheel on the sliding bracket to move, thereby achieving efficient adjustment of belt tension and solving the problem of belt tension adjustment in existing mini excavators.

[0004] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution: In a first aspect, this utility model provides a transmission belt tensioning device, comprising: The tensioner is mounted on the engine and close to the power output of the generator; The tensioning mounting plate is installed on the tensioning frame, and the top of the tensioning mounting plate is equipped with a mounting block; A sliding bracket connected to a tensioning frame includes an adjustment mechanism mounted on the top of the sliding bracket and corresponding to the mounting block, a set of sliding grooves opened on the sliding bracket, and a mounting component passing through the set of sliding grooves and connected to the tensioning mounting plate. The tension pulley is mounted on a sliding bracket with its outer surface close to the belt. The adjustment mechanism moves relative to the mounting block, and at the same time, the adjustment mechanism drives the sliding bracket to slide longitudinally relative to the tensioning frame, ultimately enabling the tensioning wheel to adjust the tension of the belt.

[0005] Optionally, the adjustment mechanism includes an adjustment block mounted on a sliding bracket, an adjustment bolt passing through the adjustment block, and a fixing nut fitted on the adjustment bolt and disposed on the adjustment block; The adjusting block is located above the mounting block, and the adjusting bolt passes through one end of the adjusting block and abuts against the mounting block.

[0006] Optionally, the slide rail assembly includes a first slide rail and a second slide rail respectively formed at the top and bottom of the sliding bracket; The mounting component includes a first bolt that passes through the first slide groove, fixes the mounting block to the tensioning frame, and a second bolt that passes through the second slide groove, fixes the tensioning mounting plate to the tensioning frame. Both the first and second bolts have washers fitted at their ends.

[0007] Optionally, a limit block is connected to the bottom of the tensioning mounting plate; Both the mounting block and the limiting block are provided with cylindrical bosses for sliding engagement with the sliding groove; the cylindrical bosses are provided with screw holes for fitting with bolts; The distance from the cylindrical boss to the surface of the tension mounting plate is greater than the thickness of the sliding bracket.

[0008] Optionally, the tensioning mounting plate is also provided with a connection hole adapted to the tensioning frame for fixing to the tensioning frame by bolts.

[0009] Optionally, the tensioning frame is fixed around the upper end of the generator by a mounting base, and a gasket is provided at the connection between the mounting base and the tensioning frame.

[0010] Optionally, the tensioning wheel is connected to the sliding bracket via a fixed shaft, and the end of the fixed shaft near the tensioning wheel is screwed to the fixed shaft with a lock nut to fix the tensioning wheel to the sliding bracket.

[0011] Optionally, a rectangular hole is provided in the middle of the tensioning mounting plate, and the rectangular hole faces the tensioning wheel; The rectangular hole corresponds to the sliding trajectory of the tensioning wheel and is used to avoid the fixed shaft.

[0012] Secondly, this utility model provides a mini excavator, wherein the generator of the mini excavator is mounted on the engine, and the transmission belt tensioning device described in the first aspect is provided between the power end of the generator and the engine.

[0013] Beneficial effects: Compared with the prior art, this utility model has the following advantages: (1) By installing the tensioning wheel in the compact gap between the engine and the generator through the tensioning frame, tensioning mounting plate and sliding bracket, the sliding bracket is driven up and down by the adjustment mechanism, which in turn drives the tensioning wheel on the sliding bracket to move, thereby achieving efficient adjustment of belt tension and solving the problem of belt tension adjustment caused by space limitations in existing mini excavators.

[0014] (2) The rotation of the adjusting bolt is changed to the up and down movement of the sliding bracket. Compared with the direct adjustment of tension in the prior art, the adjustment amount can be quantified by the number of rotations of the bolt, so as to achieve precise control of belt tension.

[0015] (3) The sliding direction of the sliding bracket is limited by the mounting block, the limiting block and the bolts connected thereto, so as to avoid its sliding deviation from affecting the adjustment stroke of the tension wheel. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural diagram of the transmission belt tensioning device in Embodiment 1 of this utility model; Figure 2 The diagram shown is a structural schematic of the tensioning frame of this utility model; Figure 3 The diagram shown is a structural schematic of the tensioning mounting plate of this utility model; Figure 4 The diagram shown is a structural schematic of the sliding bracket of this utility model; Figure 5 The diagram shown is an installation schematic of the transmission belt tensioning device in Embodiment 2 of this utility model.

[0017] In the diagram: 1-Engine, 2-Generator, 3-Gasket, 4-Tensioning frame, 4-1 Mounting base connecting bolt, 4-2 Connecting block, 4-3 Engine connecting bolt, 5-Tensioning mounting plate, 5-1 Mounting block, 5-2 Fixing bolt, 5-3 Limiting block, 6-Adjusting bolt, 7-Fixing nut, 8-Sliding bracket, 8-1 Adjusting block, 8-2 First bolt, 8-3 Fixing shaft, 9-Tensioning wheel, 9-1 Locking nut. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example

[0019] This embodiment provides a transmission belt tensioning device, including: a tensioning frame 4, a tensioning mounting plate 5, a sliding bracket 8, and a tensioning pulley 9; as shown Figure 1As shown, the tensioning frame 4 is installed in the gap between the engine 1 and the generator 2, and is close to the power output end of the generator 2; the tensioning mounting plate 5 is installed on the tensioning frame 4, and the top of the tensioning mounting plate 5 is provided with a mounting block 5-1. The sliding bracket 8 is connected to the tensioning frame 4 and includes: an adjustment mechanism, a sliding groove assembly, and a mounting component; the adjustment mechanism is installed on the top of the sliding bracket 8 and corresponds to the mounting block 5-1; the sliding groove assembly is formed on the sliding bracket 8 and includes a first sliding groove and a second sliding groove; the mounting component passes through the sliding groove assembly and is fixed to the tensioning mounting plate 5, thereby allowing the sliding bracket 8 and the tensioning mounting plate 5 to move and cooperate. The tensioning wheel 9 is installed on the sliding bracket 8 and its outer surface is close to the belt; the adjustment mechanism includes: an adjustment block 8-1, a fixing nut 7, and an adjustment bolt 6; the adjustment block 8-1 is installed on the sliding bracket 8, the adjustment bolt 6 passes through the adjustment block 8-1 and is screwed to the fixing nut 7, and the fixing nut 7 is arranged on the adjustment bolt 6; the adjustment block 8-1 is located above the mounting block 5-1, and one end of the adjustment bolt 6 passing through the adjustment block 8-1 corresponds to the mounting block 5-1. Rotate the adjusting bolt 6, and the adjusting bolt 6 moves downward until it abuts against the mounting block 5-1, outputting a downward force to the mounting block 5-1. Since the position of the tensioning frame 4 is fixed, the mounting block 5-1 outputs a reverse force to drive the adjusting block 8-1 to move upward. During the upward movement of the adjusting block 8-1, the sliding bracket 8 is driven to slide longitudinally relative to the tensioning frame 4, and finally the tensioning wheel 9 achieves the tension adjustment of the belt.

[0020] This embodiment innovatively employs a combined structure of tensioning frame 4, tensioning mounting plate 5, and sliding bracket 8, precisely installing tension wheel 9 within the tight gap between engine 1 and generator 2. The sliding bracket 8 is driven to reciprocate up and down via an adjustment mechanism, thereby flexibly adjusting the position of tension wheel 9. This achieves rapid, precise, and efficient adjustment of belt tension, effectively overcoming the technical bottleneck in belt tension adjustment in existing mini excavators.

[0021] In some possible implementations, such as Figure 2 The tensioning frame 4 shown is also equipped with mounting base connecting bolts 4-1, engine connecting bolts 4-3, and columnar connecting blocks 4-2. The mounting base connecting bolts 4-1 and the mounting base enable the tensioning frame 4 to be fixed around the upper end of the generator 2. The mounting base connecting bolts 4-1 are provided with washers 3 at the fixing points, which can effectively disperse the pressure borne by the bolts and avoid loosening of the connection or damage to the components due to local stress concentration, thereby ensuring that the tensioning frame 4 maintains a stable and reliable fixed state throughout the entire operation.

[0022] A transverse groove is provided at the connecting bolt 4-1 of the tensioning frame 4 and the mounting base, which is used to adjust the position according to the size and model of the generator 2, so that the tensioning frame 4 has a wider range of applications.

[0023] In some possible implementations, such as Figure 4 The first and second slides shown are respectively opened at the top and bottom of the sliding bracket 8; the first and second slides are located on the same straight line to ensure that the sliding bracket 8 can move up and down in a straight line, avoiding deviation and instability of the movement trajectory, and making the tension adjustment range more precise.

[0024] The mounting components include: a first bolt 8-2 and a second bolt. The first bolt 8-2 passes through the first slide groove and the mounting block 5-1 and is fixed to the tensioning frame 4. The second bolt passes through the second slide groove and the tensioning mounting plate 5 and is fixed to the tensioning frame 4. Washers are fitted at the ends of both the first bolt 8-2 and the second bolt to prevent wear.

[0025] In some possible implementations, such as Figure 3 The bottom of the tensioning mounting plate 5 shown is connected to a limiting block 5-3. Both the mounting block 5-1 and the limiting block 5-3 are provided with cylindrical bosses for sliding engagement with the slide groove; the cylindrical bosses are provided with screw holes for fitting with bolts. The distance from the cylindrical boss to the surface of the tension mounting plate 5 is greater than the thickness of the sliding bracket 8, which can prevent the sliding bracket 8 from being fixed too tightly after the first bolt 8-2 and the second bolt are driven in, thus affecting its up and down movement.

[0026] In some possible implementations, the tensioning mounting plate 5 is also provided with a connection hole adapted to the tensioning frame 4, for fixing to the connection block 4-2 of the tensioning frame 4 by means of fixing bolts 5-2.

[0027] In some possible implementations, such as Figure 1 and Figure 4 The tensioning wheel 9 shown is connected to the sliding bracket 8 via a fixed shaft 8-3, and the end of the fixed shaft 8-3 near the tensioning wheel 9 is screwed to the fixed shaft 8-3 via a locking nut 9-1, thereby fixing the tensioning wheel 9 to the sliding bracket 8.

[0028] In some possible implementations, a rectangular hole is provided in the middle of the tensioning mounting plate 5, and the rectangular hole faces the tensioning wheel 9; the rectangular hole corresponds to the sliding trajectory of the tensioning wheel 9, and is used to avoid the fixed shaft 8-3 from affecting the normal sliding of the tensioning wheel 9, thereby ensuring the smoothness and stability of the entire tensioning system and effectively guaranteeing the reliable realization of the belt tensioning function in the mechanical device.

[0029] Working principle: First, loosen the fixing nut 7 and start tightening the adjusting bolt 6. The adjusting bolt 6 moves downward until it abuts against the mounting block 5-1, outputting a downward force to the mounting block 5-1. Since the position of the tensioning frame 4 is fixed, the mounting block 5-1 outputs a reverse force, driving the adjusting block 8-1 to move upward. During the upward movement of the adjusting block 8-1, the sliding bracket 8 slides relative to the tensioning frame 4. Due to the limiting effect of the first and second slide grooves, as well as the first bolt 8-2 and the second bolt, the sliding bracket 8 can only slide longitudinally.

[0030] When the sliding bracket 8 slides, the tensioning wheel 9 will tighten the belt to achieve the tensioning effect. After adjustment, tighten the fixing nut 7 to fix the entire tensioning device to prevent loosening. Example

[0031] This embodiment provides a mini excavator, such as Figure 5 The generator 2 of the mini excavator shown is mounted on the engine 1, and the transmission belt tensioning device described in the first aspect is provided between the power end of the generator 2 and the engine 1.

[0032] This invention mounts the tensioning wheel within the compact space between the engine and generator using a tensioning frame, tensioning mounting plate, and sliding bracket. An adjusting mechanism drives the sliding bracket to move up and down, ultimately moving the tensioning wheel on the sliding bracket, thus achieving efficient adjustment of belt tension and solving the problem of belt tension adjustment in existing mini excavators. By converting the rotation of the adjusting bolt into the up and down movement of the sliding bracket, compared to the direct adjustment of tension in existing technologies, the adjustment amount can be quantified by the number of bolt rotations, achieving precise control of belt tension. The sliding bracket is limited in its sliding direction by a mounting block, a limit block, and bolts connected to it, preventing slippage that could affect the tensioning wheel's adjustment stroke.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A transmission belt tensioning device, characterized in that, include: The tensioner is mounted on the engine and close to the power output of the generator; The tensioning mounting plate is installed on the tensioning frame, and the top of the tensioning mounting plate is equipped with a mounting block; A sliding bracket connected to a tensioning frame includes an adjustment mechanism mounted on the top of the sliding bracket and corresponding to the mounting block, a set of sliding grooves opened on the sliding bracket, and a mounting component passing through the set of sliding grooves and connected to the tensioning mounting plate. The tension pulley is mounted on a sliding bracket with its outer surface close to the belt. The adjustment mechanism is used to drive the sliding bracket to slide longitudinally relative to the tensioning frame, thereby changing the contact position between the tensioning wheel and the belt to adjust the belt tension.

2. The transmission belt tensioning device according to claim 1, characterized in that, The adjustment mechanism includes an adjustment block mounted on a sliding bracket, an adjustment bolt passing through the adjustment block, and a fixing nut fitted on the adjustment bolt and set on the adjustment block; The adjusting block is located above the mounting block, and the adjusting bolt passes through one end of the adjusting block and abuts against the mounting block.

3. The transmission belt tensioning device according to claim 1, characterized in that, The slide rail assembly includes a first slide rail and a second slide rail respectively formed at the top and bottom of the sliding bracket; The mounting component includes a first bolt that passes through the first slide groove, fixes the mounting block to the tensioning frame, and a second bolt that passes through the second slide groove, fixes the tensioning mounting plate to the tensioning frame. Both the first and second bolts have washers fitted at their ends.

4. The transmission belt tensioning device according to claim 1, characterized in that, The bottom of the tensioning mounting plate is connected to a limit block; Both the mounting block and the limiting block are provided with cylindrical bosses for sliding engagement with the sliding groove; the cylindrical bosses are provided with screw holes for fitting with bolts; The distance from the cylindrical boss to the surface of the tension mounting plate is greater than the thickness of the sliding bracket.

5. The transmission belt tensioning device according to claim 1, characterized in that, The tensioning mounting plate is also provided with connection holes adapted to the tensioning frame, for fixing to the tensioning frame by bolts.

6. The transmission belt tensioning device according to claim 1, characterized in that, The tensioning frame is fixed around the upper end of the generator by a mounting base, and a gasket is provided at the connection between the mounting base and the tensioning frame.

7. The transmission belt tensioning device according to claim 1, characterized in that, The tensioning wheel is connected to the sliding bracket via a fixed shaft, and the end of the fixed shaft near the tensioning wheel is screwed to the fixed shaft with a lock nut, thereby fixing the tensioning wheel to the sliding bracket.

8. The transmission belt tensioning device according to claim 7, characterized in that, A rectangular hole is provided in the middle of the tensioning mounting plate, and the rectangular hole faces the tensioning wheel; The rectangular hole corresponds to the sliding trajectory of the tensioning wheel and is used to avoid the fixed shaft.

9. A mini excavator, characterized in that, The generator of the mini excavator is mounted on the engine, and a transmission belt tensioning device as described in any one of claims 1 to 8 is provided between the generator power end and the engine.

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