CN219484831U - Sensor assembly device of oil tank - Google Patents

Abstract

The utility model discloses a sensor assembly assembling device of an oil tank, which specifically comprises: the mounting seat comprises a workbench surface and a bracket, and the actuating mechanism comprises a motor and a connecting piece; the workbench surface is used for placing and fixing the oil tank; the bracket is used for installing the motor and allowing the motor to move; the connecting piece is installed on the output shaft of the motor, and follows the motor to move to the limit chuck clamping connection mounted on the oil tank, the motor works to drive the connecting piece to rotate, so that the limit chuck clamping connection with the connecting piece is driven to rotate, and the limit chuck is fixed on the oil tank. According to the scheme provided by the embodiment of the utility model, the semi-automatic assembly of the oil tank sensor assembly is realized, the labor cost is saved, and the assembly efficiency is improved; the device is flexible in structure, and in the embodiment, the motor can be easily moved by utilizing the balancer, so that convenience of assembly operation is improved.

Description

Sensor assembly device of oil tank

Technical Field

The utility model relates to the technical field of oil tank assembly, in particular to an assembly device for a sensor assembly of an oil tank.

Background

In the assembly process of the chassis of the automobile assembly workshop, the assembly of the sensor assembly of the automobile oil tank is generally time-consuming and labor-consuming, the installation of the sensor assembly of the oil tank is to fix the oil tank on a workbench firstly, then the sensor assembly of the oil tank is placed at a corresponding position, and then the sensor assembly of the oil tank is fixed by rotating a limiting chuck in place. When the limiting chuck is rotated, the limiting chuck is usually embedded into a force-exerting position by using a mechanical wrench, and the limiting chuck rotates by a set angle according to a set direction, and the torque force needs to be more than 500N so as to be screwed on the oil tank like screwing the bottle cap. Therefore, if the rotary table is rotated by manpower, the rotary table is labor-consuming and has low efficiency.

Disclosure of Invention

In view of the foregoing, the present utility model provides a sensor assembly assembling device for an oil tank, which overcomes or at least partially solves the foregoing problems, and the technical solutions are as follows:

the sensor assembly assembling device of the oil tank is characterized in that the sensor assembly is fixed through a limiting chuck after being installed on the oil tank, the limiting chuck is fixedly connected with the oil tank through rotating the limiting chuck after being installed on the oil tank, and the assembling device is used for rotating the limiting chuck;

the assembly device comprises a mounting seat and an executing mechanism, wherein the mounting seat comprises a workbench surface and a bracket, and the executing mechanism comprises a motor and a connecting piece; the workbench surface is used for placing and fixing the oil tank; the bracket is used for installing the motor and allowing the motor to move; the connecting piece is installed on the output shaft of the motor, and moves to be clamped with the limit chuck installed on the oil tank along with the motor.

The device is characterized in that the bracket comprises a first linear guide rail and a second linear guide rail which are arranged vertically, wherein the first linear guide rail is arranged vertically to the working table surface and is arranged on the working table surface through a rotary platform; the first linear guide rail is provided with a first sliding block, the second linear guide rail is fixedly mounted on the first sliding block, the second linear guide rail is provided with a second sliding block, and the motor is fixedly mounted on the second sliding block.

The device, optionally, the assembly device further includes a first limit structure for limiting the rotation range of the first linear guide rail, where the first limit structure includes a limit plate disposed on one end of the first linear guide rail connected to the rotary platform, and two first limit guide posts disposed on the working table and located on two sides of the rotary platform.

The device is characterized in that, optionally, a pulley is arranged at the top of the first linear guide rail, a balancer is arranged at the bottom of the first linear guide rail, a connecting ring is arranged at one point on the second linear guide rail, the connecting ring is connected with the balancer through a connecting rope, and the connecting rope passes through the pulley.

In the above device, optionally, one end of the second linear guide rail is connected with the first slider, and the other end of the second linear guide rail is provided with an electromagnet; the assembly device further comprises a limiting fixing piece, one end of the limiting fixing piece is rotatably connected to the workbench surface, the other end of the limiting fixing piece is close to or far away from the electromagnet through rotation of the limiting fixing piece, and the limiting fixing piece is adsorbed on the side face of the second linear guide rail when the electromagnet is electrified.

The device is characterized in that, optionally, at least one clamping groove is formed in the periphery of the limiting chuck, at least one clamping protrusion corresponding to the at least one clamping groove is arranged on the connecting piece, and the connecting piece is clamped with the limiting chuck by clamping the clamping protrusion into the corresponding clamping groove.

According to the device, optionally, at least two second limit guide posts are arranged on the workbench surface, and at least two limit holes corresponding to the at least two second limit guide posts respectively are arranged on the oil tank.

In the above device, optionally, a handle is disposed on the motor.

The device is characterized in that the electric control cabinet is arranged below the working table surface, and is provided with a control button and an indicator lamp, and the electric control cabinet is electrically connected with the motor.

The device is characterized in that the electric control cabinet comprises a motor, and the motor is connected with the motor through a power supply channel; the current relay is used for detecting the current of the motor and cutting off a power supply channel of the motor when detecting that the current of the motor exceeds a set threshold value.

Compared with the prior art, the utility model has the following advantages: in the scheme provided by the embodiment of the utility model, the motor is utilized to drive the limit chuck to rotate, so that the limit chuck is screwed on the oil tank, the semiautomatic assembly of the oil tank sensor assembly is realized, the labor cost is saved, and the assembly efficiency is improved; the device is flexible in structure, and in the embodiment, the motor can be easily moved by utilizing the balancer, so that convenience of assembly operation is improved.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic structural view of an assembly device for a sensor assembly of an oil tank according to an embodiment of the present utility model;

FIG. 2 is a schematic view of another structure of a sensor assembly device for an oil tank according to an embodiment of the present utility model;

FIG. 3 is a schematic view of another structure of a sensor assembly device for an oil tank according to an embodiment of the present utility model;

FIG. 4 is a schematic view of another structure of a sensor assembly device for an oil tank according to an embodiment of the present utility model;

FIG. 5 is a schematic view of another structure of a sensor assembly device for an oil tank according to an embodiment of the present utility model;

FIG. 6 is a schematic view of another embodiment of a sensor assembly device for a fuel tank according to the present utility model;

FIG. 7 is a schematic view of another structure of a sensor assembly device for a fuel tank according to an embodiment of the present utility model;

FIG. 8 is a schematic view of another embodiment of a sensor assembly device for a fuel tank according to the present utility model;

FIG. 9 is a schematic diagram of an assembly process of a sensor assembly for a fuel tank according to an embodiment of the present utility model;

wherein, 1-the working table surface; 2-an electric motor; 3-connectors; 4-a first linear guide; 5-a second linear guide rail; 6-a first slider; 7-a second slider; 8-pulleys; 9-balancer; 10-connecting rings; 11-connecting ropes; 12-an electromagnet; 13-limiting fixing pieces; 14-a second limit guide post; 15-an electric control cabinet; 16-handle; 17-limiting plates; 18-a first limit guide post; 19-emergency stop button; 20-a switch button; 21-an indicator light; 22-rotating a platform; 23-limiting chucks; 24-clamping grooves; 25-clamping openings; 26-through holes; 27-a sensor assembly; 28-clamping hook; 29-an output shaft of the motor; 30-clamping the bulge; 31-connecting shaft.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The sensor assembly is a collection device of all sensors on an automobile oil tank and comprises pressure, liquid level and other sensors, when the sensor assembly is installed on the oil tank, the sensor assembly is usually fixed on the oil tank through a limiting chuck, an installation groove is optionally formed in the oil tank, the sensor assembly is sleeved with the limiting chuck after being placed in the installation groove, and then the limiting chuck is screwed down, so that the limiting chuck is fixedly connected with the surface of the oil tank, and the sensor assembly is fixed. The sensor assembly assembling device of the oil tank is used for mechanically tightening the limit chuck arranged on the surface of the oil tank in the process of assembling the sensor assembly of the oil tank, so that the limit chuck is fixedly connected to the oil tank. Referring to fig. 1, a schematic structural diagram of a sensor assembly device for an oil tank provided by an embodiment of the present utility model is shown, and the structure shown in fig. 1 is a feasible implementation scheme of the sensor assembly device for an oil tank provided by the embodiment of the present utility model, where the sensor assembly device for an oil tank specifically includes: the mounting seat is used for mounting the oil tank and the actuating mechanism, and the actuating mechanism is used for executing the operation of the rotation limiting chuck.

Referring to fig. 1, the mounting seat comprises a workbench surface 1 and a bracket, and the actuating mechanism comprises a motor 2 and a connecting piece 3; the workbench surface 1 is used for placing and fixing an oil tank; the bracket is used for installing the motor 2 and allowing the motor 2 to move; the connecting piece 3 is installed on the output shaft of the motor 2 and moves to be clamped with the limit chuck installed on the oil tank along with the motor 2.

In the device provided by the embodiment of the utility model, when the device is assembled, the oil tank is placed on the workbench surface 1, and the workbench surface 1 is optionally provided with a limiting and fixing structure for the oil tank, so that the oil tank is fixed and prevented from moving in the assembly process. Optionally, referring to fig. 1, a possible scheme of a limit fixing structure of an oil tank is provided, by arranging at least two second limit guide posts 14 on the working table top 1, correspondingly arranging at least two limit holes corresponding to the at least two second limit guide posts 14 on the oil tank, and inserting the second limit guide posts 14 into the limit holes correspondingly arranged on the oil tank shell during assembly, thereby realizing fixed limit of the oil tank and preventing physical offset of the oil tank due to stress during assembly. Further, at least two limiting holes on the oil tank are diagonally arranged.

During assembly, the output shaft of the motor 2 drives the connecting piece 3 to rotate, so that the limiting chuck clamped with the connecting piece 3 is driven to rotate, and the limiting chuck is screwed on the surface of the oil tank. The motor 2 is mounted by a bracket, and the bracket can allow the motor 2 to move, and a possible scheme of the bracket is shown in fig. 1, wherein the bracket comprises a first linear guide rail 4 and a second linear guide rail 5 which are arranged vertically to each other, and the first linear guide rail 4 is arranged vertically to the working table 1 and is mounted on the working table 1 by a rotary platform; the first linear guide rail 4 is provided with a first sliding block 6, the second linear guide rail 5 is fixedly mounted on the first sliding block 6, the second linear guide rail 5 is provided with a second sliding block 7, and the motor 2 is fixedly mounted on the second sliding block 7.

In the device provided by the embodiment of the utility model, optionally, a rotating platform is arranged on the workbench surface 1, the first linear guide rail 4 is installed through the rotating platform, so that the first linear guide rail 4 can rotate relative to the workbench surface 1, a partial enlarged schematic diagram of the assembly device provided by the embodiment of the utility model is given by referring to fig. 4, one end of the first linear guide rail 4 is connected with the rotating platform 22, and the first linear guide rail 4 can rotate around the central shaft of the first linear guide rail 4 through the rotating platform 22. The second linear guide 5 is installed through the first slider 6 that sets up on the first linear guide 4, and the motor is installed through the second slider 7 that sets up on the second linear guide 5 again, because first linear guide 4 sets up perpendicularly with table surface 1, and second linear guide 5 sets up perpendicularly with first linear guide 4 for motor 2 can remove in the direction that is perpendicular to table surface 1 and is on a parallel with table surface 1, in addition the rotation of first linear guide 4 self, makes motor 2 all can remove in arbitrary direction. By setting the installation positions and the installation lengths of the first linear guide 4 and the second linear guide 5, the motor 2 can be moved to an arbitrary position on the table top 1.

In the device provided by the embodiment of the utility model, optionally, in order to facilitate moving the motor 2, a handle 16 may be further provided on the motor, referring to fig. 2, a specific schematic diagram of a connection structure on the first linear guide rail 4 is provided, the handle 16 may be optionally provided on one side of the motor 2, and pull the handle 16 to move the motor 2, drive the second slider 7 to move on the second linear guide rail 5, drive the first slider 6 to move on the first linear guide rail 4, and drive the first linear guide rail 4 to rotate through the rotating platform 22.

In the device provided by the embodiment of the utility model, in order to facilitate pulling of the motor 2, a balancer is optionally further provided for providing an upward force to the second linear guide 5, referring to fig. 2 and 4, a pulley 8 is provided at the top of the first linear guide 4, a balancer 9 is provided at the bottom of the first linear guide 4, a connection ring 10 is provided at a point on the second linear guide 5, the connection ring 10 is connected to the balancer 9 through a connection rope 11, and the connection rope 11 is disposed through the pulley 8. Generally, since the mass of the motor 2 and the second linear guide 5 is large, it is difficult for an operator to easily move, and the balancer 9 is used to provide an upward force in the present embodiment, whereas the balancer 9 is disposed at the bottom of the first linear guide 4 in the present embodiment, so that the pulley 8 is provided for changing the direction of the pulling force. The connecting rope 11 is optionally a steel rope, and one end of the connecting rope 11 is connected to a point on the second linear guide rail 5 through a connecting ring 10; alternatively, the first slider 6 comprises two parts which are perpendicular to each other and are respectively connected with the first linear guide 4 and the second linear guide 5, and the connecting ring 10 is arranged on the part of the first slider 6 connected with the second linear guide 5, see fig. 2, so that the second linear guide 5 and the motor 2 are connected with the balancer 9 through the connecting rope 11, the force of the balancer 9 is adjusted, the weights of the second linear guide 5 and the motor 2, and optionally other components connected with the second linear guide 5, are balanced, and thus the motor 2 can be easily moved by holding the handle 16.

In the device provided by the embodiment of the present utility model, optionally, the assembly device further includes a first limiting structure for limiting the rotation range of the first linear guide rail, and referring to fig. 3 and fig. 4, the first limiting structure includes a limiting plate 17 disposed on an end of the first linear guide rail 4 connected to the rotating platform 22, and two first limiting guide posts 18 disposed on two sides of the rotating platform 22 on the working table 1. The first linear guide rail 4 is limited by the limiting action of the two first limiting guide posts 18 on the limiting plate 17 during rotation, so that the first linear guide rail 4 can only rotate within a range limited by the two first limiting guide posts 18, and optionally, the two first limiting guide posts 18 are arranged at the edge of the working table surface 1 to prevent the motor 2 from moving beyond the working table surface 1 and avoid causing safety accidents.

In the device provided by the embodiment of the utility model, further, because the motor 2 drives the connecting piece 3 to rotate, a force for driving the second linear guide 5 to rotate around the first linear guide 4 is applied to the second linear guide 5, in order to offset the force, optionally, the assembly device is further provided with a second limiting structure, the second limiting structure comprises an electromagnet 12 and a limiting fixing piece 13, one end of the second linear guide 5 is connected with the first sliding block 6, and the other end of the second linear guide 5 is provided with the electromagnet 12; one end of the limiting fixing piece 13 is rotatably connected to the working table surface 1, and the other end of the limiting fixing piece 13 is close to or far away from the electromagnet 12 by rotating the limiting fixing piece 13. The second linear guide 5 is arranged above the working table 1, and is used for rotatably mounting the limiting fixing piece 13 on the working table 1, referring to fig. 5, a connection schematic diagram is shown when the limiting fixing piece 13 is mounted on the working table 1, a connecting shaft 31 parallel to the surface of the working table 1 is arranged on the working table 1, one end of the limiting fixing piece 13 passes through the connecting shaft 31, and the limiting fixing piece 13 can be in a rod-shaped structure; the limiting fixing piece 13 naturally hangs down when not assembled, and the limiting fixing piece 13 is rotated above the working table surface 1 during assembly, so that the other end of the limiting fixing piece 13 is in contact with the electromagnet 12 arranged on the second linear guide rail 5 and is adsorbed on the side surface of the second linear guide rail 5 when the electromagnet 12 is electrified, and the force which is generated by the operation of the motor 2 and enables the second linear guide rail 5 to rotate around the first linear guide rail 4 is counteracted by the limiting fixing piece 13. Optionally, the electromagnet 12 is a button electromagnet, before the motor works, the button electromagnet 12 is pressed to be electrified to adsorb the limiting fixing piece 13, so that the limiting fixing piece 13 counteracts the force which is generated by the motor 2 and is parallel to the working table surface 1 and is generated by the bracket during the work.

Referring to fig. 6, a schematic diagram of connection between the oil tank and the limit chuck 23 when the limit chuck 23 is mounted on the surface of the oil tank is shown, the surface of the oil tank is optionally provided with at least one clamping hook 28, the limit chuck 23 is optionally provided with at least one clamping opening 25 corresponding to the clamping hook, the clamping opening 25 comprises two connected parts, one part of the opening is larger and can accommodate the clamping hook 28 to pass through, and when the limit chuck 23 is mounted on the surface of the oil tank, the clamping hook 28 on the surface of the oil tank passes through the part with the larger opening, see fig. 6; the other part of the opening is smaller for limiting the hook 28 to be separated, after the limiting chuck 23 is installed on the surface of the oil tank, the hook 28 is moved to the part with smaller opening by rotating the limiting chuck 23, and at the moment, referring to fig. 7, the hook 28 is clamped at the part with smaller opening of the clamping opening 25, so that the oil tank and the limiting chuck 23 are fixedly connected. Further, the center of the limiting chuck 23 is provided with a through hole 26, the sensor assembly 27 can partially penetrate through the through hole 26, the clamping openings 25 can be optionally arranged on the periphery of the through hole 26, and a plurality of clamping openings 25 can be uniformly arranged along the periphery of the through hole 26.

In the device provided by the embodiment of the utility model, optionally, at least one clamping groove 24 is provided on the periphery of the limiting chuck 23, at least one clamping protrusion 30 corresponding to the at least one clamping groove 24 is provided on the connecting piece 3, and the clamping of the connecting piece 3 and the limiting chuck 23 is realized by clamping the clamping protrusion 30 into the corresponding clamping groove 24. Referring to fig. 8, a connection schematic diagram of the connecting piece 3 and the limiting chuck 23 during clamping is shown, referring to fig. 9, an assembly process diagram is shown, during actual assembly, a sensor assembly is installed in an installation cavity arranged on an oil tank, the limiting chuck 23 is sleeved, a clamping hook 28 on the surface of the oil tank enters a clamping opening 25 arranged on the surface of the limiting chuck 23, the oil tank is integrally placed on the workbench surface 1, a handle 16 on the motor 2 is pulled, the connecting piece 3 installed on an output shaft 29 of the motor moves to the limiting chuck 23 in a following manner, and a clamping protrusion 30 on the connecting piece 3 is clamped in a clamping groove 24 of the limiting chuck 23, so that the connecting piece 3 and the limiting chuck 23 are clamped; then the limiting fixing piece 13 is rotated to be in contact with the electromagnet 12 arranged on the second linear guide rail 5, and the electromagnet 12 is electrified to adsorb the limiting fixing piece 13; then the motor 2 works to drive the connecting piece 3 to rotate, so that the limit chuck 23 is driven to rotate, and the clamping hook 28 on the surface of the oil tank is clamped in the clamping opening 25.

In the device provided by the embodiment of the utility model, optionally, an electric control cabinet 15 is further installed under the working table 2, referring to fig. 1 and 3, a control button and an indicator lamp 21 are disposed on the electric control cabinet 15, and the electric control cabinet 15 is electrically connected with the motor 2. The electric control cabinet 15 can be used for electrically controlling the assembly device provided by the embodiment of the utility model, the buttons on the electric control cabinet 15 can optionally comprise a scram button 19 and a switch button 20, the scram button 19 is used for realizing the scram function of the device, the scram button 19 can be pressed when an emergency occurs, and the device pauses working; if the switch button 20 is pressed in the power-off state, the whole device is powered on and turned on, and if the switch button 20 is pressed in the power-on state, the whole device is turned off. The indicator light 21 is optionally used for displaying the working state, and if the indicator light 21 lights up to indicate that the device is in the on working state, the indicator light 21 lights up to indicate that the device is in the off state.

In the device provided by the embodiment of the utility model, optionally, the electric control cabinet 15 further comprises a current relay, and the current relay is arranged on a power supply channel of the motor 2; the current relay is used for detecting the current of the motor 2 and cutting off the power supply channel of the motor 2 when detecting that the current of the motor 2 exceeds a set threshold value. After the motor 2 works to drive the limit chuck 23 to rotate, so that after the limit chuck 23 is fastened with the oil tank, the load of the motor is increased, the working current of the motor is increased, in the embodiment, the current relay in the electric control cabinet can be optionally utilized to monitor the overcurrent of the motor, when the current exceeds a set threshold value, the current relay can be enabled to act, the power supply of the motor is disconnected, the motor stops working, and the assembly process is completed.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (10)

1. The sensor assembly assembling device of the oil tank is characterized in that the assembling device is used for rotating the limiting chuck;

the assembly device comprises a mounting seat and an executing mechanism, wherein the mounting seat comprises a workbench surface and a bracket, and the executing mechanism comprises a motor and a connecting piece; the workbench surface is used for placing and fixing the oil tank; the bracket is used for installing the motor and allowing the motor to move; the connecting piece is installed on the output shaft of the motor, and moves to be clamped with the limit chuck installed on the oil tank along with the motor.

2. The sensor assembly mounting apparatus for an oil tank of claim 1, wherein the bracket includes a first linear guide and a second linear guide disposed perpendicular to each other, the first linear guide disposed perpendicular to the work surface and mounted to the work surface by a rotary platform; the first linear guide rail is provided with a first sliding block, the second linear guide rail is fixedly mounted on the first sliding block, the second linear guide rail is provided with a second sliding block, and the motor is fixedly mounted on the second sliding block.

3. The assembly device of a fuel tank sensor assembly according to claim 2, further comprising a first limit structure for limiting a rotation range of the first linear guide rail, the first limit structure comprising a limit plate disposed on one end of the first linear guide rail connected to the rotary platform, and two first limit guide posts disposed on the table top and located on both sides of the rotary platform.

4. A sensor assembly mounting arrangement for a fuel tank according to claim 2 or 3, wherein the top of the first linear guide is provided with a pulley, the bottom of the first linear guide is provided with a balancer, a connection ring is provided at a point on the second linear guide, the connection ring is connected to the balancer by a connection rope, and the connection rope is arranged through the pulley.

5. The sensor assembly assembling apparatus of the oil tank according to claim 2, wherein one end of the second linear guide is connected to the first slider, and the other end of the second linear guide is provided with an electromagnet; the assembly device further comprises a limiting fixing piece, one end of the limiting fixing piece is rotatably connected to the workbench surface, the other end of the limiting fixing piece is close to or far away from the electromagnet through rotation of the limiting fixing piece, and the limiting fixing piece is adsorbed on the side face of the second linear guide rail when the electromagnet is electrified.

6. The sensor assembly assembling device of the oil tank according to claim 1, wherein at least one clamping groove is formed in the periphery of the limiting chuck, at least one clamping protrusion corresponding to the at least one clamping groove is arranged on the connecting piece, and the connecting piece is clamped with the limiting chuck by clamping the clamping protrusion into the corresponding clamping groove.

7. The sensor assembly assembling device of the oil tank according to claim 1, wherein at least two second limit guide posts are arranged on the working table surface, and at least two limit holes respectively corresponding to the at least two second limit guide posts are arranged on the oil tank.

8. The fuel tank sensor assembly mounting apparatus of claim 1, wherein the motor is provided with a handle.

9. The sensor assembly assembling device of the oil tank according to claim 1, wherein an electric control cabinet is further installed below the working table surface, a control button and an indicator lamp are arranged on the electric control cabinet, and the electric control cabinet is electrically connected with the motor.

10. The fuel tank sensor assembly apparatus of claim 9, wherein the electronic control cabinet includes a current relay disposed on a power supply channel of the motor; the current relay is used for detecting the current of the motor and cutting off a power supply channel of the motor when detecting that the current of the motor exceeds a set threshold value.