An automatic belt tensioning device for automotive engine testing

Abstract

This utility model relates to an automatic belt tensioning device for automotive engine testing, belonging to the field of engine testing technology. It includes a water pump drive pulley, a crankshaft pulley, and a belt, as well as a transmission device. The transmission device consists of a transmission mechanism and a mounting frame. The mounting frame includes an adapter plate, a base plate, and a side plate. The transmission mechanism includes a tensioner, a guide wheel, and a guide wheel assembly. A perforated platform extends from the top of the tensioner. The guide wheel assembly is mounted on the guide wheel and fixed to the tensioner via the perforated platform. The tensioner is mounted on the base plate to form the transmission device. One side is fixed to the engine block via hexagonal flange bolts through connecting holes on the adapter plate, and the other side is fixed to the lower end of the engine water pump via double-ended bolts through connecting holes on the side plate. After the belt wraps around the water pump drive pulley, crankshaft pulley, and guide wheel, an automatic belt tensioning device is formed, simulating the engine's operating state during vehicle driving to ensure testing and improve testing efficiency.

Description

Technical Field

[0001] This utility model relates to an automatic belt tensioning device, specifically an automatic belt tensioning device for automobile engine testing, belonging to the field of engine testing technology.

[0002] Before a car engine leaves the factory, it needs to undergo testing under simulated driving conditions to check whether its assembly quality, component quality, and various performance parameters meet the standards. During pre-shipment testing, accessories such as the alternator and compressor cannot be assembled, resulting in an incomplete gear train that malfunctions. This makes it impossible to assess the assembly quality, component quality, and performance parameters of the engine before it leaves the factory. Therefore, a belt tensioning device is needed to replace the alternator and compressor in pre-shipment testing to meet the engine's testing requirements. Only by tensioning the belt can the transmission force be generated, causing the engine's water pump to operate. The impeller inside the water pump also rotates, allowing the coolant inside the engine block and cylinder head to circulate and ensuring that the coolant temperature remains relatively stable under different operating conditions. Background Technology

[0003] According to the applicant's understanding, current pre-shipment testing of engines, when generators, compressors, and other related accessories cannot be assembled, uses a spiral tensioning device for testing, combined with... Figure 1 The belt tension is adjusted manually by rotating the screw, which drives the slide and tension roller to move. This makes it difficult to control the tension. Excessive or insufficient tension will reduce the belt's lifespan. Under current conditions, this type of spiral tensioning device presents challenges when assembling with an engine. The numerous accessories on the engine and limited working space make bolt tightening difficult. The rotating screw 1-1, due to frequent disassembly and assembly, suffers from increased thread wear, necessitating frequent replacement. The slide 1-2, made of thinner material, is prone to bending and deformation, causing the rollers to deviate from the centerline of the belt, leading to belt damage and failure, rendering testing impossible. Furthermore, when testing different engine models, the spiral tensioning device requires spacers 1-3 of varying thicknesses to ensure the rollers are aligned with the other gear trains. However, because the thicknesses of spacers 1-3 are similar, incorrect installation is easy. Incorrect selection can easily cause the bracket to bend and deform after bolt tightening, altering the roller position and causing it to deviate from the centerline. This can lead to belt failure or damage, preventing testing and potentially causing engine damage or other safety hazards. Replacing components again not only reduces work efficiency but also increases costs. All these factors indicate that the existing spiral tensioning device suffers from low testing efficiency, high failure rate, numerous safety hazards, and increased costs in all aspects. Utility Model Content

[0004] The purpose of this utility model is to address the problems existing in the prior art by proposing a belt tensioning device that is simple and reasonable in structure, easy to assemble and disassemble, and can replace accessories such as generators and air conditioning compressors to make the pulley system complete and meet the requirements of automobile engine testing. It also has the advantages of long service life, elimination of more safety hazards and improved testing efficiency.

[0005] To achieve the above objectives, this utility model provides an automatic belt tensioning device for automotive engine testing, comprising an engine water pump drive pulley, a crankshaft pulley, and a belt. Its key feature is that it further includes a transmission device, which consists of a transmission mechanism and a mounting frame. The mounting frame includes a transition plate, a base plate, and a side plate. The transmission mechanism includes a tensioner, a guide wheel, and a guide wheel assembly. A perforated platform extends from the top of the tensioner. The guide wheel assembly is mounted on the guide wheel and fixed to the tensioner via the perforated platform. The bottom of the tensioner is mounted on the base plate of the mounting frame. One side of the transmission device is connected via... The adapter plate is fixed to the engine block via hexagonal flange bolts through the connecting holes. The other side of the transmission device is fixed to the lower end of the engine water pump via double-ended bolts through the connecting holes on its side plate. After the belt is wound around the water pump drive pulley, crankshaft pulley, and guide pulley, an automatic belt tensioning device is formed. The force generated by the operation of the automatic belt tensioning device drives the water pump to circulate the coolant inside the engine, simulating the engine's operating state during vehicle driving. This ensures that the temperature of the coolant, engine oil, and various components inside the vehicle engine is controlled within the safe driving requirements, meeting the pre-delivery testing requirements of the vehicle engine.

[0006] Furthermore, the guide wheel assembly includes a rolling bearing, a bearing retaining ring, and a spacer. The rolling bearing is pressed into the center hole of the guide wheel, and a bearing retaining ring is fitted on the outside of the rolling bearing to restrict the axial movement of the rolling bearing. The spacer is coaxially assembled with the guide wheel at the bottom of the guide wheel, and is simultaneously connected to the tensioner by passing through the center hole of the guide wheel assembly, the center hole of the guide wheel, and the hole of the perforated platform through hexagonal flange bolts, and is separated from the perforated platform of the tensioner by a gap of 1.5mm.

[0007] Furthermore, the tensioner includes a tensioner body and a base. The base is coaxially assembled with the tensioner body and forms a central through hole. A locking hole extends outward from the bottom edge of the tensioner body, and a locking hole extends outward from the edge of the base. The two locking holes are matched with the same locking pin. When the tensioner body is rotated clockwise until the locking holes of the tensioner body and the base overlap and the locking pin is inserted, the tensioner is reset to its initial tightened state. A positioning pin is connected to the outer end face of the base, and a pin hole that mates with the positioning pin is formed on the base plate, as well as a mounting hole. While the positioning pin and the pin hole are interference-fitted, an internal hexagonal bolt passes through the central through hole of the tensioner body and the base, and the mounting hole on the base plate, and the internal hexagonal bolt nut is locked, causing the bottom of the tensioner to be assembled with the base plate.

[0008] Furthermore, the tensioner is cylindrical in shape and uses an elastic, automatically adjustable tensioner with an internal spring structure. The internal spring is made of silicon manganese spring steel. The main body shell and base of the tensioner are made of die-cast aluminum alloy.

[0009] Furthermore, the number of guide wheel grooves is the same as the number of grooves in the water pump drive wheel and crankshaft pulley, and the guide wheel is made of alloy steel.

[0010] Furthermore, a weight-reducing area is created below the connecting hole on the adapter plate by cutting away material, and a weight-reducing hole is created in the middle by cutting away material. A first-level step block is created on the adapter plate opposite to the weight-reducing area by cutting away material. Except for the first-level step block, the adapter plate is vertically welded to one end of the bottom plate. The bottom of the first-level step block is welded to the upper surface of the side plate, and the side of the side plate is simultaneously welded to the side of the bottom plate.

[0011] Furthermore, high and low reinforcing ribs are added between the transition plate and the two sides of the base plate. The bottom of the low reinforcing rib is welded to the base plate, and one side of the low reinforcing rib is attached to the inner side of the first-level step pier. The transition plate, base plate and side plate are all 10mm thick carbon structural steel plates.

[0012] Furthermore, the guide wheel assembly is pre-installed on the guide wheel and fixed to the tensioner's perforated platform via hexagonal flange bolts. Then, the bottom of the tensioner is assembled onto the outer end face of the base plate to form a transmission device, ultimately fixed between the engine water pump and the engine cylinder block. The belt is then routed around the water pump drive pulley, crankshaft pulley, and guide wheel, and the locking pin on the tensioner is pulled out, completing the automatic belt tensioning device assembly and initiating the engine testing process: The locking pins on the two locking holes on the tensioner are pulled out, and the two locking holes automatically shift under the action of the spring inside the tensioner. Due to the spring's action, the guide wheel moves counterclockwise upwards by 30°, and simultaneously, the tensioner automatically tensions the belt. The tensioner automatically adjusts the belt tension during operation to ensure stable belt operation. When the car engine starts, the fuel in the engine cylinders does work, pushing the piston up and down to rotate the crankshaft. The crankshaft pulley mounted on the crankshaft also rotates. The automatic belt tensioning device tensions the belt to drive the rotational force and rotate the water pump drive wheel. The impeller inside the water pump rotates synchronously, starting the circulation of coolant inside the engine. The circulation of coolant carries away the heat generated by the engine components during operation, keeping the temperature inside the engine at a constant and safe level. This also ensures the quality and safety of all components during engine testing.

[0013] The beneficial effects of this invention are as follows: This automatic belt tensioning device solves the problem of belt tension failure caused by incomplete pulley systems due to the inability to install accessories such as alternators and air conditioning compressors during pre-shipment testing of automotive engines. It further simulates the engine's operating state during vehicle operation, ensuring that the temperatures of the coolant, engine oil, and various components inside the engine are controlled within the safe driving requirements, meeting the pre-shipment testing requirements. Moreover, the device is multi-dimensionally adjustable, effectively meeting and adapting to the installation needs of various engine models. It is also evident that this device has advantages such as compact structure, convenient assembly and disassembly, stable and reliable operation, and long service life; it also ensures the belt is in good working condition, thus significantly improving engine testing efficiency. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of a spiral tensioning device used in existing technology testing.

[0016] Figure 2 This is a schematic diagram of the mounting bracket structure according to an embodiment of the present utility model.

[0017] Figure 3 This is a schematic diagram of the tensioner structure according to an embodiment of the present utility model.

[0018] Figure 4 This is a schematic diagram of the guide wheel structure in an embodiment of the present utility model.

[0019] Figure 5 This is a schematic diagram of the components of the guide wheel assembly in an embodiment of this utility model.

[0020] Figure 6 This is a schematic diagram of the guide wheel assembly mounted on the guide wheel in an embodiment of this utility model.

[0021] Figure 7 This is a front view schematic diagram of the guide wheel and tensioner after assembly in an embodiment of this utility model.

[0022] Figure 8 This is a schematic diagram of the reverse side of the guide wheel and tensioner after assembly in an embodiment of this utility model.

[0023] Figure 9 This is a schematic diagram of the transmission device structure according to an embodiment of the present utility model.

[0024] Figure 10 This is another structural schematic diagram of the transmission device according to an embodiment of the present utility model.

[0025] Figure 11 This is a schematic diagram of the assembly state of an embodiment of the present utility model.

[0026] Wherein: 1-1-rotating screw, 1-2-slide carriage, 1-3-spacer, 1-bracket, A-engine, a-water pump drive wheel, b-crankshaft pulley, P-belt, 1-mounting bracket, 11-adapter plate, 110-weight reduction zone, 111-first-stage step block, 12-base plate, 121-high reinforcing rib, 122-low reinforcing rib, 13-side plate, 2-tensioner, 20-platform with holes, 21-tensioner body, 22-base, 221-positioning pin, 23-locking pin, 3-guide wheel, 4-guide wheel assembly, 41-rolling bearing, 42-bearing retaining ring, 43-spacer, o-center through hole, k-locking hole, x-pin hole, y-mounting hole. Detailed Implementation Example 1

[0027] This embodiment of one presents an automatic belt tensioning device for automotive engine testing, such as... Figure 2 — Figure 11 As shown, the system includes a water pump drive pulley a, a crankshaft pulley b, and a belt P on engine A. It also includes a transmission device, which consists of a transmission mechanism and a mounting bracket 1. The transmission mechanism includes a tensioner 2, a guide pulley 3, and a guide pulley assembly 4. Figure 2 In this embodiment, the mounting frame 1 includes a transition plate 11, a base plate 12, and a side plate 13, all of which are 10mm thick carbon structural steel plates. A weight-reducing area 110 is created below the connecting holes on the transition plate 11 by cutting away material, and a weight-reducing hole is created in the middle by cutting away material. A first-level step pier 111 is created on the transition plate 11 opposite to the weight-reducing area 110 by cutting away material. Except for the first-level step pier 111, the transition plates 11 are vertically welded to one side of the base plate 12. The bottom of the first-level step pier 111 is welded to the upper surface of the side plate 13, and simultaneously, the side of the side plate 13 is welded to the side of the base plate 12. High reinforcing ribs 121 and low reinforcing ribs 122 are added between the transition plate 11 and the two sides of the base plate 12. The bottom of the low reinforcing rib 122 is welded to the base plate 12, and simultaneously, one side of the low reinforcing rib 122 is attached to the inner side of the first-level step pier 111. (The last sentence appears to be a continuation of the previous paragraph and is left untranslated.) Figure 3 Tensioner 2 has a perforated platform 20 extending from its top. Guide wheel assemblies 4 are mounted on guide wheel 3 and fixed to tensioner 2 via the perforated platform 20. The bottom of tensioner 2 is mounted on the base plate 12 of mounting bracket 1. One side of the transmission device is fixed to the engine block via hexagonal flange bolts through the connecting holes on its adapter plate 11. The other side of the transmission device is fixed to the lower end of the engine water pump via double-ended bolts through the connecting holes on its side plate 13. After belt P wraps around water pump drive wheel a, crankshaft pulley b and guide wheel 3, an automatic belt tensioning device is formed. The force generated by the operation of the automatic belt tensioning device drives the water pump to circulate the coolant inside engine A, simulating the operating state of engine A during car driving. This ensures that the temperature of coolant, oil and other components inside engine A are controlled within the safe driving requirements of the car, meeting the pre-delivery test requirements of engine A.

[0028] Combination Figure 4 In this embodiment, the number of grooves on guide wheel 3 is the same as the number of grooves on water pump drive wheel a and crankshaft pulley b. Having the same number of grooves effectively improves transmission efficiency, reduces belt wear, thereby extending service life and improving operational stability. Guide wheel 3 is made of alloy steel, which also enhances its hardness. In this embodiment, it is also combined with... Figure 5 , Figure 6 , Figure 7 and Figure 8 The guide wheel assembly 4 includes a rolling bearing 41, a bearing retaining ring 42, and a spacer 43. The rolling bearing 41 is pressed into the center hole of the guide wheel 3, and the bearing retaining ring 42 is fitted on the outside of the rolling bearing 41 to restrict its axial movement. The spacer 43 is coaxially mounted with the guide wheel 3 at the bottom of the guide wheel 3, and is simultaneously connected to the tensioner 2 by hexagonal flange bolts passing through the center hole of the guide wheel assembly 4, the center hole of the guide wheel 3, and the perforated platform hole 20. The spacer 43 is spaced 1.5mm from the perforated platform 20 of the tensioner 2, ensuring axial clearance between the guide wheel assembly 4 and the tensioner 2. Figure 7 , Figure 8 Before the hexagonal flange bolts are put into operation, a gasket is installed on the hexagonal flange bolts. The gasket has the function of locking the guide wheel assembly 4 and preventing the guide wheel assembly 4 from moving laterally. Then the hexagonal flange bolts pass through the guide wheel assembly 4, the center hole of the guide wheel 3 and the hole on the perforated platform 20 to connect with the tensioner 2.

[0029] Further integration Figure 3 , Figure 7 , Figure 8 The tensioner 2 includes a tensioner body 21 and a base 22. The base 22 is coaxially assembled with the tensioner body 21 and forms a central through hole o. A locking hole k extends outward from the bottom edge of the tensioner body 21, and a locking hole k extends outward from the edge of the base 22. The locking holes k of the tensioner body 21 and the locking holes k of the base 22 are matched with the same locking pin 23. When the tensioner body 21 is rotated clockwise until the two locking holes k coincide and the locking pin 23 is inserted, the tensioner 2 is reset to the initial tightened state. Specifically, when the tensioner 2 is reset, the tensioner base 22 needs to be in a fixed stationary state, while the tensioner body 21 is in a rotatable state. After rotating the tensioner body 21 clockwise until the two locking holes k coincide, the locking pin 23 is inserted, and after locking, the base 22 and the tensioner body 21 are in a fixed stationary state. A locating pin 221 is attached to the outer end face of the base 22. The base plate 12 has a pin hole x that mates with the locating pin 221, and also has a mounting hole y. Figure 2As shown; while the locating pin 221 is interference-fitted with the pin hole x, the internal hex bolt passes through the central through hole o of the tensioner body 21 and the mounting hole y on the base plate 12, and the internal hex bolt nut is tightened, causing the bottom of the tensioner 2 to assemble with the base plate 12. Since the back of the base plate 12 is fixed with a nut on the internal hex bolt, axial movement of the transmission mechanism is prevented. Figure 9 , Figure 10 As shown. The above-mentioned addition of the positioning pin 221 and the pin hole x with an interference fit can maintain good coaxiality between the tensioner 2 and the base plate 12, and can withstand higher axial force and torque. It can also reduce resonance and vibration noise of the tensioner 2 during operation; it can prevent the tensioner 2 from becoming loose and rotating during operation, thus preventing the tensioner 2 from losing its function.

[0030] The above embodiments combined with Figure 3 , Figure 7 and Figure 8 The tensioner 2 is cylindrical in shape and requires an elastic automatic adjustment type with an internal spring structure. The internal spring is made of silicon manganese spring steel with high strength and high elasticity. The outer shell of the tensioner body 21 and the base 22 are made of aluminum die-casting alloy material with high strength, strong corrosion resistance and easy die-casting characteristics.

[0031] Before the engine test, the automatic belt tensioning device was selected and implemented according to the above requirements, while combining... Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 The guide wheel assembly 4 is pre-installed on the guide wheel 3 and fixed to the tensioner 2's perforated platform 20 via hexagonal flange bolts. Then, the bottom of the tensioner 2 is assembled onto the outer end face of the mounting bracket 1's base plate 12 to form a transmission device. Next, one side adapter plate 11 of the mounting bracket 1 is fixed to the engine block, and the other side plate 13 of the mounting bracket 1 is fixed to the lower end of the engine water pump. Then, the belt P is wound around the water pump drive pulley a, the crankshaft pulley b, and the automatic belt tensioning device guide wheel 3. The entire assembly is then complete. Figure 10As shown. The following is the test procedure for car engine A: Pull out the locking pins 23 from the two locking holes k on the tensioner 2. The two locking holes k automatically shift under the action of the spring inside the tensioner 2. Due to the spring, the guide wheel 3 will move counterclockwise upwards by about 30°. Simultaneously, the tensioner 2 automatically tensions the belt P. During the operation of the tensioner 2, the belt tension can also be adjusted automatically to keep the belt P tension at approximately 120 Hz, ensuring stable operation of belt P during the test. After powering on the car engine A and connecting oil and water, the engine A starts running and enters the test state. The fuel in the four cylinders of the car engine A alternately works, pushing the pistons up and down, which in turn drives the crankshaft to rotate clockwise. This causes the crankshaft pulley b, mounted on the crankshaft, to also rotate clockwise. The automatic belt tensioning device then tensions the belt P. The rotational force drives the water pump drive wheel a to rotate clockwise, and the internal impeller connected to the water pump drive wheel rotates clockwise synchronously. The rotation of the impeller causes the coolant inside the car engine A to circulate. The flow of coolant can carry away the heat generated by the working parts of the car engine A during operation, so that the internal temperature of the car engine A can be kept at a constant and safe condition during high-speed operation. Even when the car engine A is running at high speed for a long time, the coolant temperature can be well controlled at about 90℃, and the coolant temperature, oil temperature and the temperature of various components of the car engine A can be kept at a safe operating condition, which meets the testing requirements of the car engine A, ensures the accuracy of the test data, and ensures the quality and safety of each component in the testing of the car engine A.

[0032] Compared with existing technologies Figure 1 The existing equipment involves numerous manual operations and adjustments, inevitably leading to significant disadvantages and defects. However, based on the embodiments of this device, it is clear that it can solve many problems existing in the prior art and has obvious advantages. This device also utilizes a tensioner mechanism to solve the pulley system problem in the automotive engine testing process. The tensioner automatically adjusts and controls the belt tension, further ensuring the stability and reliability of the belt during automotive engine testing. At the same time, it fully meets the pulley system requirements in automotive engine testing, completely eliminating the safety risks to the automotive engine caused by abnormal coolant temperature due to belt damage or detachment, and also ensuring the stability of the internal coolant temperature during automotive engine testing.

[0033] In addition to the embodiments described above, this utility model may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. An automatic belt tensioning device for automobile engine testing, comprising an engine water pump drive pulley, a crankshaft pulley, and a belt, characterized in that: It also includes a transmission device, which consists of a transmission mechanism and a mounting frame. The mounting frame includes an adapter plate, a base plate, and a side plate. The transmission mechanism includes a tensioner, a guide wheel, and a guide wheel assembly. The top of the tensioner extends outward from a perforated platform. The guide wheel assembly is mounted on the guide wheel and fixed to the tensioner through the perforated platform. The bottom of the tensioner is mounted on the base plate of the mounting frame. One side of the transmission device is fixed to the engine block via hexagonal flange bolts through connecting holes on its adapter plate. The other side of the transmission device is fixed to the lower end of the engine water pump via double-ended bolts through connecting holes on its side plate. After the belt wraps around the water pump drive pulley, crankshaft pulley, and guide wheel, an automatic belt tensioning device is formed. The force generated by the operation of the automatic belt tensioning device drives the water pump to circulate the coolant inside the engine, simulating the engine's operating state during vehicle driving. This ensures that the temperature of the coolant, engine oil, and various components inside the vehicle engine are controlled within the safe driving requirements, meeting the pre-delivery testing requirements of the vehicle engine.

2. The automatic belt tensioner for testing of an automotive engine according to claim 1, wherein: The guide wheel assembly includes a rolling bearing, a bearing retaining ring, and a spacer. The rolling bearing is pressed into the center hole of the guide wheel, and a bearing retaining ring is fitted on the outside of the rolling bearing to restrict the axial movement of the rolling bearing. The spacer is coaxially assembled with the guide wheel at the bottom of the guide wheel and is simultaneously connected to the tensioner by passing through the center hole of the guide wheel assembly, the center hole of the guide wheel, and the hole of the perforated platform through hexagonal flange bolts, while keeping the spacer separated from the perforated platform of the tensioner by a gap of 1.5mm.

3. The automatic belt tensioner for testing of an automotive engine as set forth in claim 1, wherein: The tensioner includes a tensioner body and a base. The base and the tensioner body are coaxially assembled and form a central through hole. A locking hole extends outward from the bottom edge of the tensioner body, and a locking hole extends outward from the edge of the base. The two locking holes are matched with the same locking pin. When the tensioner body is rotated clockwise until the locking holes of the tensioner body and the base overlap and the locking pin is inserted, the tensioner is reset to its initial tightened state. A positioning pin is connected to the outer end face of the base, and a pin hole that mates with the positioning pin is formed on the base plate, as well as a mounting hole. While the positioning pin and the pin hole are interference-fitted, an internal hexagonal bolt passes through the central through hole of the tensioner body and the base, and the mounting hole on the base plate, and the internal hexagonal bolt nut is locked, so that the bottom of the tensioner is assembled with the base plate.

4. The automatic belt tensioner for testing the automobile engine according to claim 1 or 3, characterized in that: The tensioner is cylindrical in shape and uses an elastic, automatically adjustable tensioner with an internal spring structure. The internal spring is made of silicon manganese spring steel. The main body shell and base of the tensioner are made of die-cast aluminum alloy.

5. The automatic belt tensioner for testing of an automotive engine as set forth in claim 1, wherein: The number of guide wheel grooves is the same as the number of grooves in the water pump drive wheel and crankshaft pulley, and the guide wheels are made of alloy steel.

6. The automatic belt tensioner for testing of an automotive engine as set forth in claim 1, wherein: The transition plate has a weight reduction area below the connecting hole and a weight reduction hole in the middle. On the transition plate opposite to the weight reduction area, a first-level step block is formed by cutting. The transition plates other than the first-level step block are vertically welded to one side of the base plate. The bottom of the first-level step block is welded to the upper surface of the side plate, and the side of the side plate is simultaneously welded to the side of the base plate.

7. The automatic belt tensioner for testing of an automotive engine according to claim 6, wherein: High and low reinforcing ribs are added between the transition plate and both sides of the base plate. The bottom of the low reinforcing rib is welded to the base plate, and one side of the low reinforcing rib is simultaneously attached to the inner side of the first-level step pier. The transition plate, base plate, and side plates are all... 10mm thick carbon structural steel plate.

8. The automatic belt tensioner for testing of an automobile engine according to claim 2 or 3, wherein: The guide wheel assembly is pre-installed on the guide wheel and fixed to the tensioner's perforated platform via hexagonal flange bolts. The bottom of the tensioner is then assembled onto the outer end face of the base plate to form a transmission device. Finally, it is fixed between the engine water pump and the engine block. The belt is then routed around the water pump drive pulley, crankshaft pulley, and guide wheel, and the locking pin on the tensioner is pulled out, completing the automatic belt tensioning device assembly. The engine testing process begins: the locking pins on the two locking holes on the tensioner are pulled out, and the two locking holes automatically shift under the action of the spring inside the tensioner. Due to the spring, the guide wheel moves counterclockwise upwards by 30°, and simultaneously, the tensioner automatically tensions the belt. During operation, the belt tension is automatically adjusted to ensure stable belt operation. When the car engine starts, the fuel in the engine cylinder does work, pushing the piston up and down to rotate the crankshaft. The crankshaft pulley mounted on the crankshaft also rotates. The automatic belt tensioning device tensions the belt to drive the rotational force and drive the water pump drive wheel to rotate. The impeller inside the water pump rotates synchronously, starting the circulation of coolant inside the engine. The circulation of coolant carries away the heat generated by the car engine components during operation, keeping the temperature inside the car engine at a constant and safe temperature, while ensuring the quality and safety of all components during the car engine test.

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