CN204852203U - Chassis dynamometer and overspeed device tensioner thereof - Google Patents

Abstract

The utility model discloses a chassis dynamometer and a tensioning device thereof. The bracket of the tensioning device is provided with a bolt through hole for the rod of the adjusting bolt to pass through, and the adjusting bolt is screwed with a lock nut that is matched with the bracket, and when the tensioning side of the tensioning roller faces the bracket, The locking bolt is on the side of the bracket facing away from the tensioning roller; when the tensioning side of the tensioning roller is facing away from the bracket, the locking bolt is on the side of the bracket facing the tensioning roller. When the internal thread in the lock nut is damaged, only the lock nut needs to be removed from the rod of the adjustment bolt to realize the correction of the entire tensioning device. Compared with the prior art, the whole bracket needs to be removed from the In the case of dismounting from the frame, the tensioning device in the utility model reduces the loss of parts and materials in the maintenance process.

Description

A chassis dynamometer and its tensioning device

technical field

The utility model relates to a chassis dynamometer and a tensioning device thereof.

Background technique

In the chassis dynamometer, in order to ensure the consistent speed of the driving roller and the driven roller, the driving and driven rollers are connected by synchronous pulleys through the synchronous belt. Since the synchronous belts of various materials are not complete elastic bodies, the Under the action of tension, after a certain period of operation, it will relax due to plastic deformation, reducing the initial tension. In order to ensure the efficiency of the belt drive, the value of the initial tension should be checked regularly. If it is found to be insufficient, it must be re-tensioned to work normally. The most common preloading method is to change the center distance between the main and driven rollers, but as the center distance increases, the installation angle of the car wheel increases, and the supporting force of the front and rear rollers on the wheel also increases. , this will lead to an increase in the rolling resistance of the vehicle running on the side dynamometer stand, so the center distance of the chassis dynamometer roller cannot be adjusted. At this time, the tensioning mechanism can be used to tension the timing belt. For example, a tension wheel disclosed in Chinese patent document CN202158153U (announcement date is March 7, 2012) includes a bracket fixed on the frame by countersunk screws and an adjusting bolt extending vertically, and the top of the adjusting bolt is threaded. On the frame, the bottom of the adjusting bolt is connected to the movable plate, and the left and right sides of the movable plate are respectively guided to move up and down and assembled in the chute surrounded by the pressure plate and the frame, and a flat belt wheel shaft is fixed on the movable plate, flat The pulley shaft is equipped with tension rollers through bearings. When in use, adjust the tightening and loosening of the bolts to drive the movable plate to move up and down in the chute, so as to adjust the extrusion force between the tension rollers and the synchronous belt, so that the synchronous Belt retensioned. However, the positioning between the tensioning device and the frame is completely guaranteed by the threaded connection between the adjusting bolt and the bracket, that is, the profile of the connecting thread between the adjusting bolt and the bracket will bear the preload of the tensioning roller. , the damage speed of the tooth type of the connecting thread is accelerated, and the connecting thread on the bracket is directly arranged in the connecting hole opened on it, so when the threaded connection between the adjusting bolt and the bracket is loose or damaged, the bracket must be removed from the machine. This method of directly dismantling and replacing the whole bracket not only increases the loss of raw materials, but also after the bracket is removed, the top of the adjusting bolt will realize the limit position, so that after the new bracket is reinstalled, The new bracket and the adjusting bolt need to be re-aligned and positioned, thereby increasing the difficulty of overhauling the tensioning device and reducing the efficiency of overhauling the tensioning device.

Utility model content

The purpose of the utility model is to provide a tensioning device which reduces material loss in the maintenance process. At the same time, the utility model also provides a chassis dynamometer using the tensioning device.

In order to achieve the above object, the technical scheme of the tensioning device in the utility model is as follows:

The tensioning device includes a tensioning roller for tensioning the synchronous belt, an adjustment bolt for driving the tensioning roller to move relative to the frame, and a bracket for fixing on the frame. The tensioning roller has a function for contacting and pressing The tensioning side of the belt surface of the synchronous belt faces the direction in which the adjusting bolt is tightened. The bracket is provided with a bolt through hole for the rod of the adjusting bolt to pass through. lock nut, and when the tension side of the tension roller faces the bracket, the lock bolt is on the side of the bracket facing away from the tension roller; when the tension side of the tension roller faces away from the bracket, the lock bolt is on the side of the bracket the side facing the tensioning roller.

Between the tension roller and the adjustment bolt is a movable plate for moving along the axial direction of the adjustment bolt and assembled on the frame. The tension roller is rotatably assembled on the movable plate, and the adjustment bolt is fixedly connected with the movable plate.

A guide groove or a hole extending axially along the adjusting bolt is opened on the movable plate.

The bracket includes a reinforcing plate fixed on the frame and a fixed block fixed on the reinforcing plate. The bolts pass through holes on the fixing block. Guide posts in guide grooves or holes.

The tensioning roller is assembled on the movable plate through the rotation of the axle, one end of the axle is fixed on the movable plate, the other end is worn in the inner hole of the tensioning roller, and a bearing is assembled between the axle and the tensioning roller.

The technical scheme of chassis dynamometer in the utility model is as follows:

Chassis dynamometer, including the frame and the belt transmission mechanism and tensioning device set on it. The belt transmission mechanism includes the driving and driven pulleys and the timing belt connected between the driving and driven pulleys. The tensioning device includes Tensioning rollers for tensioning the timing belt, adjusting bolts for driving the tensioning rollers to move relative to the frame and brackets for fixing on the frame, the tensioning rollers have a belt surface for contacting and pressing the timing belt The tension side is facing the tightening direction of the adjustment bolt, the bracket is provided with a bolt through hole for the rod of the adjustment bolt to pass through, and the adjustment bolt is screwed with a lock nut that cooperates with the bracket stopper, and When the tensioning side of the tensioning roller faces the bracket, the locking bolt is on the side of the bracket facing away from the tensioning roller; when the tensioning side of the tensioning roller is facing away from the bracket, the locking bolt is on the side of the bracket facing the tensioning roller side.

Between the tension roller and the adjustment bolt is a movable plate for moving along the axial direction of the adjustment bolt and assembled on the frame. The tension roller is rotatably assembled on the movable plate, and the adjustment bolt is fixedly connected with the movable plate.

A guide groove or a hole extending axially along the adjusting bolt is opened on the movable plate.

The bracket includes a reinforcing plate fixed on the frame and a fixed block fixed on the reinforcing plate. The bolts pass through holes on the fixing block. Guide posts in guide grooves or holes.

The tensioning roller is assembled on the movable plate through the rotation of the axle, one end of the axle is fixed on the movable plate, the other end is worn in the inner hole of the tensioning roller, and a bearing is assembled between the axle and the tensioning roller.

In the utility model, the bracket is provided with a bolt through hole for the rod of the adjusting bolt to pass through, and the adjusting bolt is screwed with a locking nut that is matched with the bracket, and when the tensioning side of the tensioning roller faces the bracket, The locking bolt is on the side of the bracket facing away from the tensioning roller; when the tensioning side of the tensioning roller is facing away from the bracket, the locking bolt is on the side of the bracket facing the tensioning roller. When in use, by changing the position of the lock nut on the rod of the adjustment bolt, the expansion and contraction of the adjustment screw on the bracket is realized, and then the tension roller is driven by the adjustment bolt to move. During this process, relying on the adjustment bolt and the lock nut The threaded connection between the lock nut and the bracket is used to realize the telescopic adjustment of the adjustment bolt relative to the bracket, and when the internal thread in the lock nut is damaged, it is only necessary to move the lock nut from the adjustment The correction of the entire tensioning device can be realized by removing the rod part of the bolt. Compared with the situation in the prior art that the entire bracket needs to be removed from the frame, the tensioning device in the utility model reduces the number of parts in the maintenance process. The loss, also reduces the material loss.

Description of drawings

Fig. 1 is the structural representation of drive part in the embodiment of chassis dynamometer of the present utility model;

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Detailed ways

Embodiment of the chassis dynamometer in the utility model: as shown in Fig. 1 and Fig. 2, the chassis dynamometer includes a frame 1 and a roller 17 assembled through a bearing seat on it, and the roller 17 plays an auxiliary support for the wheel and The role of friction transmission, the shaft end of the drum 17 is connected to the synchronous pulley 2 through a flat key, and the synchronous belt 4 is used to connect the two synchronous pulleys 2. Since the synchronous belt 4 is generally composed of rubber and curtains, the pre-tightening force Under the action, after a certain period of operation, the synchronous belt 4 will relax due to plastic deformation, causing the synchronous belt 4 to vibrate, and at the same time reduce the transmission efficiency of the synchronous belt 4. Therefore, generally a tension is added to the synchronous belt transmission tighten the device. In this embodiment, the tensioning device is mainly composed of a tensioning wheel assembly 7 , a lock nut 3 , a fixing block 5 , a screw 6 , a reinforcement plate 8 , a welding nut 15 and a channel steel 16 . The tensioning wheel assembly 7 is made up of adjusting bolt 9, jumper 10, tensioning wheel shaft 11, rolling bearing 12, tensioning roller 13 and movable plate 14. The channel steel 16 is welded on the overall support 1, and the fixed block 5 and the reinforcing plate 8 are welded on the channel steel 16. There is a round hole in the middle of the reinforcing plate 8, the hole diameter is a little larger than the outer diameter of the screw 6, and the welding nut 15 is welded to the reinforcing plate 8, the screw 6 passes through the movable plate 14 and is screwed onto the welding nut 15; there is also a circular bolt through hole in the middle of the fixed block 5, and the diameter of the bolt through hole is slightly larger than the outer diameter of the adjusting bolt 9. The adjusting bolt 9 in the tension wheel assembly 7 passes through the round hole and is connected with the lock nut 3 . The tensioning wheel shaft 11 is welded on the movable plate 14. Two rolling bearings 12 are pressed on both sides of the tensioning roller 13. The tensioning roller 13 is supported on the tensioning wheel shaft 11 through the rolling bearings 12. There is a retaining ring 10 on the outside of the rolling bearing 12. The retaining ring 10 Prevent the tensioning roller 13 and rolling bearing 12 from detaching from the tensioning wheel shaft 11, the tensioning roller 13 can rotate freely around the tensioning wheel shaft 11, and the contact between the outer circle of the timing belt 4 and the tensioning roller 13 belongs to rolling friction, which does not affect the timing belt 4 The transmission efficiency of the tension roller 13 is that the upper part of the tension roller 13 is in contact with the belt surface of the synchronous belt 4 and presses the synchronous belt 4 upward, so that the upper part of the tension roller 13 is used for contacting and pressing the synchronous belt. Tension side with face.

When the synchronous belt 4 becomes slack due to plastic deformation, loosen the screw 6 so that the tension wheel assembly 7 can move up and down freely. The round hole on the fixed block 5 is limited, that is, the screw 6 can be screwed on the guide chute to realize the positioning of the bottom of the movable plate 14, and the adjusting bolt 9 is positioned on the fixed block 5 through the lock nut 3 to realize the positioning of the movable plate 14. The top of the plate 14 is positioned. At this time, tighten the locking nut 3 to move the tensioning wheel assembly 7 upwards to re-tension the timing belt 4, and at the same time tighten the screw 6 to complete the adjustment of the tensioning device, and the chassis dynamometer can start to work.

In the above embodiments, the locking nut is on the side of the fixed block facing away from the tensioning roller. In other embodiments, when the tensioning side of the tensioning roller is facing away from the fixing block, the locking bolt is on the side facing the One side of the tension roller.

In the above-mentioned embodiment, the fixed block, the reinforcing plate and the channel steel form the support for the tensioning device to connect the frame. The up and down guiding movement of the movable plate can be removed and directly cooperated with the frame to realize.

Embodiment of the tensioning device in the utility model: the structure of the tensioning device in this embodiment is the same as that of the above-mentioned embodiment, so it will not be repeated.

Claims (10)

1. Tensioning device, including tensioning rollers for tensioning the synchronous belt, adjusting bolts for driving the tensioning rollers to move relative to the frame, and brackets for fixing on the frame. The tensioning rollers have a function for contacting And compress the tension side of the belt surface of the synchronous belt, the tension side is facing the direction of the adjustment bolt tightening, it is characterized in that, the bracket is provided with a bolt through hole for the rod of the adjustment bolt to pass through, and the adjustment bolt is screwed with a The lock nut fits with the bracket stop, and when the tension side of the tension roller faces the bracket, the lock bolt is on the side of the bracket facing away from the tension roller; when the tension side of the tension roller faces away from the bracket , The locking bolt is located on the side of the bracket facing the tensioning roller. 2. The tensioning device according to claim 1, characterized in that, between the tension roller and the adjustment bolt, there is a movable plate for guiding and moving along the axial direction of the adjustment bolt and assembled on the frame, and the tension roller is rotatably assembled on the frame. On the movable plate, the adjusting bolt is fixedly connected with the movable plate. 3. The tensioning device according to claim 2, wherein a guide groove or a hole extending axially along the adjusting bolt is opened on the movable plate. 4. The tensioning device according to claim 3, wherein the support includes a reinforcing plate fixed on the frame and a fixing block fixed on the reinforcing plate, the bolt through holes are on the fixing block, and the reinforcing plate is fixed on the reinforcing plate. Fixed or integrally provided with a guide post inserted in the guide slot or hole along the axial direction of the adjustment bolt. 5. The tensioning device according to claim 2, characterized in that the tensioning roller is assembled on the movable plate through the rotation of the axle, one end of the axle is fixed on the movable plate, and the other end is worn in the inner hole of the tensioning roller , A bearing is assembled between the axle and the tensioning roller. 6. Chassis dynamometer, including the frame and the belt transmission mechanism and tensioning device installed on it. The belt transmission mechanism includes the driving and driven pulleys and the timing belt connected between the driving and driven pulleys. The device includes a tensioning roller for tensioning the timing belt, an adjusting bolt for driving the tensioning roller to move relative to the frame and a bracket for fixing on the frame. The tensioning roller has a function for contacting and pressing the timing belt. The tension side of the belt surface faces the direction in which the adjustment bolt is tightened. It is characterized in that the bracket is provided with a bolt through hole for the rod of the adjustment bolt to pass through. lock nut, and when the tensioning side of the tensioning roller faces the bracket, the locking bolt is on the side of the bracket facing away from the tensioning roller; when the tensioning side of the tensioning roller is facing away from the bracket, the locking bolt is on the The side of the bracket facing the tensioning roller. 7. The chassis dynamometer according to claim 6, characterized in that, between the tension roller and the adjustment bolt, there is a movable plate for guiding and moving along the axial direction of the adjustment bolt and assembled on the frame, and the tension roller rotates and assembles On the movable plate, the adjusting bolt is fixedly connected with the movable plate. 8 . The chassis dynamometer according to claim 7 , wherein a guide groove or a hole extending axially along the adjusting bolt is opened on the movable plate. 9. The chassis dynamometer according to claim 8, wherein the bracket includes a reinforcing plate fixed on the frame and a fixing block fixed on the reinforcing plate, the bolt through holes are on the fixing block, and the reinforcing plate The upper part is fixed or integrally provided with a guide post inserted in the guide slot or hole along the axial direction of the adjustment bolt. 10. The chassis dynamometer according to claim 7, characterized in that the tension roller is assembled on the movable plate through the rotation of the axle, one end of the axle is fixed on the movable plate, and the other end is mounted on the inner hole of the tension roller , a bearing is fitted between the axle and the tension roller.